MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'Journal of Electrocardiology' source. Wed, 17 Mar 2010 13:59:56 +0100 http://www.medworm.com/index.php?rid=3273640&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610000099%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273640 Tue, 16 Feb 2010 13:59:25 +0100 3273640 http://www.medworm.com/index.php?rid=3273639&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610000087%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273639 Tue, 16 Feb 2010 13:59:25 +0100 3273639 http://www.medworm.com/index.php?rid=3273638&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610000051%2Fabstract%3Frss%3Dyes An abstract entitled “A novel low-tilt waveform for the internal defibrillation of ventricular fibrillation” by J.R. Bennett, K.M. Daragh, S.J. Walsh, J.D. Allen, J. Anderson, A.A.J. Adgey, and G. Manoharan was inadvertently not printed in the November/December 2008 issue (41/6) of Journal of Electrocardiology. We have included the missing material below. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273638 Tue, 16 Feb 2010 13:59:25 +0100 3273638 http://www.medworm.com/index.php?rid=3273634&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610000749%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273634 Tue, 16 Feb 2010 13:59:21 +0100 3273634 http://www.medworm.com/index.php?rid=3273632&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610000713%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273632 Tue, 16 Feb 2010 13:59:21 +0100 3273632 http://www.medworm.com/index.php?rid=3273626&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609006104%2Fabstract%3Frss%3Dyes Conclusion: We found strong agreement between the direction of the ST injury vector and the location of myocardial ischemia. The ST injury vector may be the key to higher diagnostic accuracy for inferobasal transmural ischemia and may help distinguishing between RCA and LCX occlusions in the acute phase. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273626 Tue, 16 Feb 2010 13:59:20 +0100 3273626 http://www.medworm.com/index.php?rid=3273625&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005548%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273625 Tue, 16 Feb 2010 13:59:20 +0100 3273625 http://www.medworm.com/index.php?rid=3273624&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609006049%2Fabstract%3Frss%3Dyes This study tests the ability of high-frequency components of the depolarization phase (HF-QRS) vs conventional ST-elevation criteria to detect and quantify myocardial ischemia.Methods: Twenty-one patients admitted for elective percutaneous coronary intervention were included. Quantification of the ischemia was made by myocardial scintigraphy. High-resolution electrocardiogram before and during percutaneous coronary intervention was recorded and signal averaged. The HF-QRS were determined within the frequency band 150 to 250 Hz. ST-segment deviation was measured in the standard frequency range ( (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273624 Mon, 11 Jan 2010 00:00:00 +0100 3273624 http://www.medworm.com/index.php?rid=3086103&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005597%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086103 Tue, 15 Dec 2009 13:55:48 +0100 3086103 http://www.medworm.com/index.php?rid=3086102&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005585%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086102 Tue, 15 Dec 2009 13:55:48 +0100 3086102 http://www.medworm.com/index.php?rid=3086099&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005135%2Fabstract%3Frss%3Dyes We report the case of a 41-year-old man with acute myocardial infarction showing first ST elevation in V1-V6-DI-aVL leads followed by a typical V2-V4 ST depression (concomitant occlusion of proximal diagonal branch with an incomplete left anterior descending occlusion) and DII-DIII-aVF ST elevation. At coronary angiography, a proximal left anterior descending coronary stenosis with right coronary artery thrombosis was found. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086099 Tue, 15 Dec 2009 13:55:48 +0100 3086099 http://www.medworm.com/index.php?rid=3086093&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609006074%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086093 Tue, 15 Dec 2009 13:55:47 +0100 3086093 http://www.medworm.com/index.php?rid=3086085&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005366%2Fabstract%3Frss%3Dyes Conclusion: Automatic QT measurement by the Mida1000/CoroNet system (Ortivus AB, Danderyd, Sweden) is an accurate, efficient, and easily applied method for initial screening for LQTS. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086085 Tue, 15 Dec 2009 13:55:46 +0100 3086085 http://www.medworm.com/index.php?rid=3086083&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005536%2Fabstract%3Frss%3Dyes Conclusion: The healthy newborns exhibit peculiarities of 24-hour cardiac rhythm with isolated premature beats, pauses of sinus rhythm less 1000 milliseconds, steep slope of QT/RR by analysis of QT dynamicity. There are low HRV, and symmetrical AC/DC capacity was typically for autonomic regulation of HR, probably due to high sympathetic activity at this age. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086083 Tue, 15 Dec 2009 13:55:46 +0100 3086083 http://www.medworm.com/index.php?rid=3086081&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900555X%2Fabstract%3Frss%3Dyes For a number of decades, one of the major applications of electrocardiography has been in the diagnosis, classification, and monitoring of cardiac rhythm disorders. More recently, electrocardiographic research extended this area to include stratification of susceptibility to arrhythmias and characterization of underlying pathophysiologic processes. Judging from the number of publications on the topic and from the number of dedicated sessions at meetings of different learned societies, scientific and clinical interest in these electrocardiographic applications is vastly growing. I was therefore pleased when the Editor-in-Chief of this Journal asked me to assess uninvited articles that have presently been accepted for publication with the aim of composing a symposium dedicated to the broad a... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086081 Tue, 15 Dec 2009 13:55:45 +0100 3086081 http://www.medworm.com/index.php?rid=3273635&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900538X%2Fabstract%3Frss%3Dyes This study was performed to test the hypothesis that there exists a correlation between the Butler-Leggett (BL) criterion for right ventricular hypertrophy on the electrocardiogram and the Qp/Qs shunt ratio in adults with ostium secundum atrial septal defects (ASDs).Methods: Demographic, cardiac catheterization, ASD closure, and electrocardiographic data were acquired on 70 patients with secundum ASDs closed percutaneously. Simple linear regression and logistic regression models were created to test the hypothesis.Results: The mean Qp/Qs ratio and BL criterion value were 1.61 ± 0.46 and 0.11 ± 0.41, respectively. The BL criterion values correlated with shunt ratios (r2 = 0.11 and P = .004). A BL criterion value greater than 0 mV predicted a significant shunt ratio (Qp/Qs ≥1.5) (odds ra... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273635 Thu, 03 Dec 2009 00:00:00 +0100 3273635 http://www.medworm.com/index.php?rid=3273633&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005123%2Fabstract%3Frss%3Dyes This article presents a review of the anatomical and electrophysiologic characteristics of patients with primum AVSD and provides recent knowledge of electroanatomical relationships of the heart. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273633 Thu, 03 Dec 2009 00:00:00 +0100 3273633 http://www.medworm.com/index.php?rid=3273623&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900541X%2Fabstract%3Frss%3Dyes Conclusion: The VR changes were related both to the size and the location of the MAR and most pronounced during occlusion of the left anterior descending artery. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273623 Thu, 03 Dec 2009 00:00:00 +0100 3273623 http://www.medworm.com/index.php?rid=3273629&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005408%2Fabstract%3Frss%3Dyes We present a case of pacemaker dysfunction related to infective endocarditis. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273629 Wed, 25 Nov 2009 00:00:00 +0100 3273629 http://www.medworm.com/index.php?rid=3273622&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002829%2Fabstract%3Frss%3Dyes Abstract: The electrocardiogram (ECG) remains the most immediately accessible and widely used diagnostic tool for guiding emergency treatment strategies. The ECG recorded during acute myocardial ischemia is of diagnostic, therapeutic, and prognostic significance. In patients with myocardial ischemia as a result of decreased blood supply, the initial 12-lead ECG typically shows (1) predominant ST-segment elevation (STE) as part of STE acute coronary syndrome (STE-ACS), or (2) no predominant STE, that is, non–STE ACS (NSTE-ACS). Patients with predominant STE are classified as having either aborted myocardial infarction (MI) or ST-elevation MI (STEMI) based on the absence or presence of biomarkers of myocardial necrosis. The MI may be aborted either by spontaneous or therapeutic reperfusion... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273622 Mon, 16 Nov 2009 00:00:00 +0100 3273622 http://www.medworm.com/index.php?rid=3273631&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005147%2Fabstract%3Frss%3Dyes Conclusions: Right-sided accessory pathways with overt ventricular preexcitation and LV dyssynchrony may cause dilated cardiomyopathy. An association between such pathways and dilated cardiomyopathy is suggested by the rapid normalization of ventricular function and reverse LV remodeling after a loss of ventricular preexcitation. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273631 Mon, 02 Nov 2009 00:00:00 +0100 3273631 http://www.medworm.com/index.php?rid=2921531&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004270%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921531 Sat, 24 Oct 2009 12:51:55 +0100 2921531 http://www.medworm.com/index.php?rid=2921530&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004269%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921530 Sat, 24 Oct 2009 12:51:55 +0100 2921530 http://www.medworm.com/index.php?rid=2921529&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005159%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921529 Sat, 24 Oct 2009 12:51:54 +0100 2921529 http://www.medworm.com/index.php?rid=2921528&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005093%2Fabstract%3Frss%3Dyes We report an erratum in the September/October 2009 issue (42/5) of the Journal of Electrocardiology (pages 395-399). We published an editorial by Polychronis Dilaveris and Christodoulos Stefanadis titled “Current morphologic and vectorial aspects of P-wave analysis” (2009;42;395-399; doi:10.1016/j.jelectrocard.2009.04.003). We regretfully acknowledge that of this editorial was reproduced poorly in the print journal on page 396. Please see below. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921528 Sat, 24 Oct 2009 12:51:54 +0100 2921528 http://www.medworm.com/index.php?rid=2921515&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609005330%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921515 Sat, 24 Oct 2009 12:51:52 +0100 2921515 http://www.medworm.com/index.php?rid=2921511&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004191%2Fabstract%3Frss%3Dyes Recently, the mechanism of the effects on the right ventricular (RV) pacing in relation to prevent from prolonged QRS duration and heart failure remains unknown. It is also not clear why electrocardiograms (ECGs) wide QRS, left bundle branch block, and ventricular dyssynchrony are developed during the right apical pacing. To understand well, we conducted a simulation study of RV midseptal pacing to observe the QRS duration change and pattern of ECG based on a whole-heart model composed of approximately 50 000 units with a rotating anisotropic fiber orientation in ventricular muscles. The exaction of the heart model incorporated the specialized conduction system and anisotropic conduction velocity of myocardium. The normal distribution of action potential waveforms with the longest durati... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921511 Sat, 24 Oct 2009 12:51:51 +0100 2921511 http://www.medworm.com/index.php?rid=2921510&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900418X%2Fabstract%3Frss%3Dyes Early reperfusion therapy to limit infarct size was introduced in the late 1980s. The effect of this advance in cardiac care on the occurrence of arrhythmias in acute coronary syndromes (ACS) is unknown. The purpose of this study was to describe arrhythmias during the first 24 hours of admission and explore predictors and outcomes of arrhythmias in patients with ACS in the postreperfusion era. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921510 Sat, 24 Oct 2009 12:51:51 +0100 2921510 http://www.medworm.com/index.php?rid=2921509&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004178%2Fabstract%3Frss%3Dyes Currently used electrocardiographic criteria for identifying patients with ST-segment-elevation acute myocardial infarction (STEMI) perform with high specificity, but low sensitivity. The aim of this study was to investigate whether the ischemia detection ability of existing ACC/ESC STEMI criteria, based on 12-lead electrocardiogram (ECG), can be improved by considering expanded sets of contiguous leads and/or altered threshold values. Our design set consisted of 12-lead ECGs from STAFF3 database of controlled ischemic episodes caused by balloon inflation during angioplasty in left anterior descending (LAD) (n = 35), right coronary artery (RCA) (n = 47), and left circumflex (LCx) (n = 17) coronary arteries. Our test set comprised 116 twelve-lead ECGs of patients with (n = 58) and without (... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921509 Sat, 24 Oct 2009 12:51:51 +0100 2921509 http://www.medworm.com/index.php?rid=2921508&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004166%2Fabstract%3Frss%3Dyes Semiautomated QT interval measurement is the most commonly used method for “thorough QT studies” and other clinical drug development studies. In semiautomated methods, intervals are measured by computer, and then every electrocardiogram (ECG) tracing is overread by trained human readers. Typically, human readers change approximately 30% of the machine-placed QT annotations during the overread process. The impact on study results of these changes may be substantial: a recent TQT study of tolterodine showed that human alterations changed the overall mean Fridericia-corrected, drug-induced QT change (ΔQTcF) by more than 10 milliseconds. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921508 Sat, 24 Oct 2009 12:51:51 +0100 2921508 http://www.medworm.com/index.php?rid=2921507&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004154%2Fabstract%3Frss%3Dyes Ventricular preexcitation is common in childhood. Dilated cardiomyopathy may arise in such patients as a result of recurrent or long-standing tachyarrhythmia. We demonstrated a causal relationship between ventricular preexcitation and dilated cardiomyopathy, in the absence of proven recurrent tachyarrhythmias. This relationship seems to depend on the location of the accessory pathway. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921507 Sat, 24 Oct 2009 12:51:47 +0100 2921507 http://www.medworm.com/index.php?rid=2921506&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004142%2Fabstract%3Frss%3Dyes Understanding the relationship between cardiac restitution and the development of arrhythmias remains a key task for the study of cardiac electrical dynamics. Although the physical phenomena involved in initiation of electrical instabilities are dauntingly complex, there exist reduced models of cardiac tissue that reproduce characteristic features of cardiac restitution and possess the advantage of being analytically solvable. In such models, concepts such as a threshold for cardiac alternans can be framed in terms of a few parameters of the excitable system. Their study could provide a theoretical foundation for validation of potential clinically viable methods of diagnosis of cardiac abnormality based on electrocardiogram stress testing. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921506 Sat, 24 Oct 2009 12:51:47 +0100 2921506 http://www.medworm.com/index.php?rid=2921505&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004130%2Fabstract%3Frss%3Dyes In 2004, a Scientific Statement of practice standards for in-hospital cardiac monitoring was published by the American Heart Association and endorsed by the International Society of Computerized Electrocardiology (ISCE), including recommendations for continuous ischemia (cST-seg) monitoring. In 2007, the author sent an electronic survey nationally to a random sample of 915 cardiologists from a pool of 4985 certified cardiologists registered with the electronic vendor, Epocrates. Of hospitals where respondents admitted patients, 49% had a standard of practice for using cST-seg monitoring for cardiac patients. Most responding cardiologists selected early identification of potential ischemia (83.5%) and early identification of reocclusion after percutaneous coronary intervention (PCI) (74%) a... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921505 Sat, 24 Oct 2009 12:51:47 +0100 2921505 http://www.medworm.com/index.php?rid=2921504&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004129%2Fabstract%3Frss%3Dyes Dominant frequency analysis (DFA) and spectral organization analysis on cardiac electrograms (EGM) are receiving much attention to establish clinical targets for cardiac arrhythmia ablation. However, previous spectral descriptions of the EGM have been constrained to the 0- to 30-Hz band; in doing so, they often discard relevant information, as the harmonic structure, the spectral envelope, or the presence of several organized mechanisms. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921504 Sat, 24 Oct 2009 12:51:47 +0100 2921504 http://www.medworm.com/index.php?rid=2921503&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004117%2Fabstract%3Frss%3Dyes This study compares the performance of two experienced electrocardiographers with newly developed computer algorithm in prediction of the infarct-related artery, as assessed by coronary angiography. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921503 Sat, 24 Oct 2009 12:51:47 +0100 2921503 http://www.medworm.com/index.php?rid=2921502&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004105%2Fabstract%3Frss%3Dyes The physical examination findings of an accentuated pulmonic component (P2) of the second heart sound (S2) and loud right ventricular third and fourth heart sound (RV S3 and S4) are associated with pulmonary hypertension (PH). However, there are limitations to the accuracy of physical examination findings for the diagnosis of PH. We sought to examine the association between computerized acoustic cardiographic assessment of these heart sounds and pulmonary artery systolic pressure (PASP) measured during right heart catheterization. We hypothesized that an accentuated S2, S3, and S4 over the pulmonic ausculatory region would correlate with PH. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921502 Sat, 24 Oct 2009 12:51:47 +0100 2921502 http://www.medworm.com/index.php?rid=2921501&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004099%2Fabstract%3Frss%3Dyes Correct positioning of peripherally inserted central catheters (PICC) is essential to avoid complications such as perforation, thrombosis, or dysrhythmias caused by interactions with the vessel wall or the endocardium. Misplacement of catheter tip location occurs in roughly 20% of cases. The correct position of the catheter tip is in the superior vena cava (SVC) close to its entrance to the right atrium (RA). The most common way to assess catheter position is by radiographic assessment after placement. An alternative method for correct catheter placement is to record an intravascular electrocardiogram (ECG) from the catheter stylet. Using this technique, an increased P-wave amplitude provides verification that the intravascular catheter tip has passed into the RA. No commercial ECG-guidanc... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921501 Sat, 24 Oct 2009 12:51:47 +0100 2921501 http://www.medworm.com/index.php?rid=2921500&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004087%2Fabstract%3Frss%3Dyes An increasing number of patients are now treated with implanted cardiac pacemakers and implantable cardioverter defibrillators. Detection of pacemaker stimuli (spikes) from modern pacemakers using a standard 12-lead electrocardiograph is unreliable. One reason is that many spike detection systems were developed and tested to meet current (2007) AAMI/IEC specifications that are still based on a 1991 version of AAMI EC-11. However, pacemaker technology has advanced dramatically since then. We therefore decided to investigate the characteristics of modern pacemaker stimuli as recorded from the body surface. With newly developed high-sampling rate technology built in-house, it was feasible to visualize and analyze the characteristics of modern pacemaker stimuli as recorded by a high-quality el... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921500 Sat, 24 Oct 2009 12:51:46 +0100 2921500 http://www.medworm.com/index.php?rid=2921499&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004075%2Fabstract%3Frss%3Dyes Standard gel electrodes are inconvenient because they require aggressive skin preparation and use an electrolytic solution to ensure good signal quality in stress and long-term electrocardiogram (ECG) monitoring applications. The purpose of this study was to compare the reliability and signal quality of traditional gel electrodes with novel biopotential sensors (BFS) that require no abrasive skin preparation or electrolytic solution. We hypothesized that BFS have equivalent electric performance to high quality Ag-AgCl wet electrodes. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921499 Sat, 24 Oct 2009 12:51:46 +0100 2921499 http://www.medworm.com/index.php?rid=2921498&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004063%2Fabstract%3Frss%3Dyes Although the standard 12-lead electrocardiogram (ECG) is considered the criterion standard for the diagnosis of myocardial ischemia, nearly half of ECGs in patients presenting to the emergency department with chest pain who subsequently rule in for acute myocardial infarction with positive serum biomarkers are normal or nonspecific. Along with electrical changes, ischemia has been shown to cause left ventricular dysfunction, which can cause left atrial pressure and volume overload. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921498 Sat, 24 Oct 2009 12:51:46 +0100 2921498 http://www.medworm.com/index.php?rid=2921497&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004051%2Fabstract%3Frss%3Dyes Lux et al (J Electrocardiol, 2006;39:S161-S164) described the use of the root mean square (RMS) electrocardiogram signal to obtain several useful parameters of ventricular repolarization. Two parameters, the RMS R- to T-peak interval (RT; a surrogate for the mean ventricular action potential duration) and the RMS T-width (TW; a measure of the dispersion of ventricular repolarization times), are known to relate to the risk of serious ventricular arrhythmias. Software for these analyses is apparently not now available for Windows or Linus/Unix operating systems. Accordingly, we developed software using the Matlab platform for measuring these 2 (and other) parameters of research and clinical interest. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921497 Sat, 24 Oct 2009 12:51:46 +0100 2921497 http://www.medworm.com/index.php?rid=2921496&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900404X%2Fabstract%3Frss%3Dyes Many studies have been published that have created complex and confusing algorithms for the location of bypass tracts. No study has used the National Institutes of Health Visible Human Project Slices of the Heart as improved by David Criley to relate the electrocardiogram (ECG) delta wave vector (Δ) to cardiac anatomy. From the study of Kilpatrick and Scheinman (1994), the localization of the bypass tract algorithms were converted into ECG vectors and superimposed on the frontal and horizontal plane of the National Institutes of Health Visible Human Project Slices of the Heart. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921496 Sat, 24 Oct 2009 12:51:46 +0100 2921496 http://www.medworm.com/index.php?rid=2921495&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004038%2Fabstract%3Frss%3Dyes Electrocardiographic (ECG) lead configuration of modified chest leads (MCL) remains problematic for many health care providers. The consequences include potential iatrogenic injury to patients. Development of a new MCL that incorporates a unipolar limb lead (instead of a bipolar limb lead system) could potentially reduce configuration errors. Such a lead would need to be investigated for diagnostic accuracy before being examined for ease of configuration relative to MCL1. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921495 Sat, 24 Oct 2009 12:51:46 +0100 2921495 http://www.medworm.com/index.php?rid=2921494&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004026%2Fabstract%3Frss%3Dyes Simulation of electrical activation of the heart and its comparison with real activation is a promising method in testing potential determinants of excitation events in the heart. The need for simulation of the electrical activity of the human heart is now emerging as a step forward for understanding and predicting electrophysiological patterns in humans. Initial points of excitation and the manner in which the activation spreads from these points are important variables determining QRS complex characteristics. It was suggested that in humans, the initial excitation of the left ventricle is primary determinant of QRS complex characteristics, and it begins at the papillary muscles and septum, where the fascicles of the left bundle branch insert. The aim of this study is to test the hypothes... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921494 Sat, 24 Oct 2009 12:51:46 +0100 2921494 http://www.medworm.com/index.php?rid=2921493&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004014%2Fabstract%3Frss%3Dyes A novel recording device has been developed to continuously record 3 channels of electrocardiogram (ECG) for more than 24 hours at a time. This consists of a patient applied real-time analyzer (Philips IntelliPatch Philips, Eindhoven, NL), which includes extensive noise reduction and detection hardware and software. The ECG obtained is a “short vector” ECG with 3 sensing electrodes whose centers lie at the corners of a 1.5-in equilateral triangle. Upon automatic alarm trigger, the device sends surrounding ECG data to a central monitor immediately for confirmation. The suitability of this shorter ECG vector for such analysis was studied. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921493 Sat, 24 Oct 2009 12:51:46 +0100 2921493 http://www.medworm.com/index.php?rid=2921492&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004002%2Fabstract%3Frss%3Dyes In this study, we examined to which extent a dipole ST vector model accounts for the measured ST deviations in acute ischemia patients. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921492 Sat, 24 Oct 2009 12:51:46 +0100 2921492 http://www.medworm.com/index.php?rid=2921491&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003999%2Fabstract%3Frss%3Dyes Congenital long-QT syndrome (LQTS) is characterized by prolongation of the QT interval and changes in T-wave morphology. Different variations of LQTS differ in clinical courses, and genotyping is thus useful for risk stratification. Specific T-wave morphologies are associated with specific genotypes, and a quantification of T-wave morphology could be used as a fast way of genotyping in a clinical setting. The aim of this study was to develop a classification of LQTS based on the Morphology Combination Score and the Fridericia-corrected QT interval (QTcF) for surface electrocardiogram (ECG) genotyping of LQTS. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921491 Sat, 24 Oct 2009 12:51:46 +0100 2921491 http://www.medworm.com/index.php?rid=2921490&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003987%2Fabstract%3Frss%3Dyes There is evidence to support the importance of frequency domain analysis of the signal-averaged P wave for the study of atrial electrophysiology. However, the introduction of a pacing spike renders any frequency domain analysis useless, as the amplitude of the spike overshadows that of the P wave itself. As such, the pacing spike largely dominates the energy in all frequency bands. To mitigate this, we have developed a semiautomated pacing-spike removal algorithm and we seek to validate it in this study. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921490 Sat, 24 Oct 2009 12:51:45 +0100 2921490 http://www.medworm.com/index.php?rid=2921489&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003975%2Fabstract%3Frss%3Dyes Compact portable electrocardiogram (ECG) monitors have been recently introduced to the public and have been widely used. However, it is uncertain whether ST-T changes can be accurately evaluated by the portable ECG devices. The aim of this study was to examine the accuracy of evaluation of ST-T changes, as compared with the standard 12-lead ECG. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921489 Sat, 24 Oct 2009 12:51:45 +0100 2921489 http://www.medworm.com/index.php?rid=2921488&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003963%2Fabstract%3Frss%3Dyes Low-level laser therapy (LLLT) has been used to treat various pathophysiologic disorders. It has recently been reported that a case of sinus arrest caused by mechanical stimulation to the autonomic nervous system was improved by LLLT to the stellate ganglion. The aim of the present study was to evaluate the efficacy of LLLT on the heart rate in patients with sick sinus syndrome (SSS). (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921488 Sat, 24 Oct 2009 12:51:45 +0100 2921488 http://www.medworm.com/index.php?rid=2921487&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003951%2Fabstract%3Frss%3Dyes Acute ST-segment elevation myocardial infarction (STEMI) of the inferior wall can be caused by an occlusion of either the right coronary artery (RCA) or left circumflex (LCx) artery. ST-segment depression in aVr has recently been suggested as a predictor of left circumflex artery involvement. It was also shown to be associated with impaired myocardial perfusion. The purpose of this study is to evaluate the clinical significance and anatomic correlation of aVr depression during inferior wall STEMI. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921487 Sat, 24 Oct 2009 12:51:44 +0100 2921487 http://www.medworm.com/index.php?rid=2921486&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900394X%2Fabstract%3Frss%3Dyes In conclusion, this mobile 12-lead ECG information system not only is time efficient but can also effectively improve the medical treatment quality in emergency medicine. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921486 Sat, 24 Oct 2009 12:51:43 +0100 2921486 http://www.medworm.com/index.php?rid=2921485&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003938%2Fabstract%3Frss%3Dyes Food and Drug Administration (FDA)/center for device and radiological health (CDRH) is charged with the responsibility to evaluate new electrocardiogram (ECG) devices for market clearance. As ECG technology expands into new diagnostic areas, FDA is challenged with evaluating the results of clinical studies that aim to support these new diagnostic claims. Because of the investment of time, effort, and other resources, FDA strongly encourages early collaboration with ECG developers before the initiation of a clinical study. In this article, we aim to describe some key considerations for an ECG developer to consider before planning and conducting clinical testing. These considerations may hopefully provide an efficient, least burdensome path toward market clearance. (Source: Journal of Electr... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921485 Sat, 24 Oct 2009 12:51:43 +0100 2921485 http://www.medworm.com/index.php?rid=2921484&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003926%2Fabstract%3Frss%3Dyes Smartphones combine functions of mobile phones, personal digital assistants, and pocket PCs, and their use for business, communication, and entertainment is growing exponentially. Interestingly, biomedical software applications can be developed easily for smartphone devices that support Windows Mobile or Java. Because smartphones are popular in all age groups, one could posit that they might be useful as a portable health monitor for physiologic parameters and as an electrocardiogram (ECG) imaging device. Advantages of these portable minicomputers are that they are light and compact and support wireless communication and even eye-to-eye video communication. In addition, sensors for vital parameters can easily be connected to such devices, and physiologically monitored parameters could be s... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921484 Sat, 24 Oct 2009 12:51:43 +0100 2921484 http://www.medworm.com/index.php?rid=2921483&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003914%2Fabstract%3Frss%3Dyes Metabolically compromised tissue may respond to stimuli in a patterned matter. T-wave alternans (TWA) is one form of a patterned behavior in ECG that may be predictive of SCD. We introduce Microvolt Electrocardiogram (ECG) Amplitude Periodicity (MEAP) to detect TWA by analyzing body-surface ECG. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921483 Sat, 24 Oct 2009 12:51:43 +0100 2921483 http://www.medworm.com/index.php?rid=2921482&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003902%2Fabstract%3Frss%3Dyes In this study, we report the results of our automated age- and sex-specific Selvester scoring system for ECG-estimated MI size. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921482 Sat, 24 Oct 2009 12:51:43 +0100 2921482 http://www.medworm.com/index.php?rid=2921481&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003896%2Fabstract%3Frss%3Dyes In this study, we evaluate changes in T-wave morphology (MCS) and QTc induced by moxifloxacin, an industry benchmark for subtle repolarization effects. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921481 Sat, 24 Oct 2009 12:51:43 +0100 2921481 http://www.medworm.com/index.php?rid=2921480&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003884%2Fabstract%3Frss%3Dyes Electrocardiographic (ECG) criteria for acute myocardial ischemia that may lead to myocardial infarction (MI) have recently been revised, in part to address gender differences. To assess the performance of these revised ECG criteria, we studied 154 patients presenting to the emergency department (ED) with symptoms of possible ischemia, but a nondiagnostic initial ECG by prior standard criteria. Final diagnostic categories included acute MI (n = 51), unstable angina (UA) (n = 52), and noncardiac chest pain (n = 51). The 3 groups were matched for age and sex. Electrocardiograms were read by a single board-certified cardiologist in a blinded fashion several months apart, using first the standard criteria and then the revised criteria. In 24 subjects (16%), the initial nondiagnostic ECG was no... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921480 Sat, 24 Oct 2009 12:51:43 +0100 2921480 http://www.medworm.com/index.php?rid=2921479&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003872%2Fabstract%3Frss%3Dyes In this study, we assess the effect that misplacement of these recording sites has on reconstruction of the 12-lead electrocardiogram (ECG). We focus on lateral recording sites I and A. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921479 Sat, 24 Oct 2009 12:51:43 +0100 2921479 http://www.medworm.com/index.php?rid=2921478&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003860%2Fabstract%3Frss%3Dyes In most currently available automatic external defibrillator (AEDs), real-time processing restraints have always remained a challenge in the development of more intelligent algorithms. Because FFT analysis is not an easily applied technique in real time, an alternative technique had to be developed. The estimation of the main frequency component of the impedance cardiography (ICG) signal by the use of integer bandpass filters, and the analysis of the electrocardiogram (ECG) signal was proposed to produce an algorithm to discriminate between shockable and nonshockable high-rate (>180 beats/min) ventricular tachycardia (HRVT). (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921478 Sat, 24 Oct 2009 12:51:43 +0100 2921478 http://www.medworm.com/index.php?rid=2921477&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003859%2Fabstract%3Frss%3Dyes An abnormal spatial QRS-T angle has a larger hazard ratio for fatal cardiac events than established cardiovascular and electrocardiogram (ECG) risk factors. The spatial angle between the QRS and T axes is the angle between the directions of ventricular depolarization and repolarization. Although traditionally obtained from orthogonal leads, computer-derived measurements of this spatial alignment can be calculated from a standard 12-lead ECG using: QRS/Tsimple = ACOS {[(QRSnetV6 × TnetV5) + (QRSnetaVF × TnetaVF) + (QRSnetV2 × TnetV2)]/(QRSsm × Tsm)}. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921477 Sat, 24 Oct 2009 12:51:42 +0100 2921477 http://www.medworm.com/index.php?rid=2921476&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003847%2Fabstract%3Frss%3Dyes A key issue associated with any computer-based tool for QT interval measurement is accurate determination of the end of the T-wave (Tend). Both noise resistance and accuracy with complex T-wave morphologies are of great importance, but many existing methods are unreliable in the presence of substantial noise or T-wave morphology changes. Moreover, existing methods do not include algorithms for self-assessment of the quality of Tend determination. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921476 Sat, 24 Oct 2009 12:51:42 +0100 2921476 http://www.medworm.com/index.php?rid=2921475&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003835%2Fabstract%3Frss%3Dyes Applying the solid angle theory to the interpretation of electrocardiographic criteria of left ventricular hypertrophy (LVH), the spatial determinants are stressed, that is, the extent of activation front and the distance of the recording electrodes. However, distinctive changes in electrical properties of hypertrophied myocardium creating a substrate for arrhythmias have been extensively reported. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921475 Sat, 24 Oct 2009 12:51:42 +0100 2921475 http://www.medworm.com/index.php?rid=2921474&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003823%2Fabstract%3Frss%3Dyes This study examines the performance of this algorithm for detecting and quantifying T-wave alternans (TWA) as one form of patterned behavior in a part of an ECG beat. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921474 Sat, 24 Oct 2009 12:51:42 +0100 2921474 http://www.medworm.com/index.php?rid=2921473&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003811%2Fabstract%3Frss%3Dyes Accurate measurement of QT intervals is of pivotal importance in cardiac safety trials. Thorough QT studies must be designed to detect an 8- to 12-millisecond ΔΔQTc prolongation in a positive control group treated with moxifloxacin. QT measurements are typically performed manually to maximize measurement accuracy. Automatic QT measurements are more cost-effective, but the ability of commercial algorithms to detect moxifloxacin-induced QTc prolongation should be investigated. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921473 Sat, 24 Oct 2009 12:51:42 +0100 2921473 http://www.medworm.com/index.php?rid=2921472&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900380X%2Fabstract%3Frss%3Dyes The objective of this study is to investigate the correlation relationship between Sokolow-Lyon voltage criteria and BMI in Swiss conscripts. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921472 Sat, 24 Oct 2009 12:51:42 +0100 2921472 http://www.medworm.com/index.php?rid=2921470&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003252%2Fabstract%3Frss%3Dyes Conclusion: In postinfarction patients with preserved left ventricular function, SAF identifies a subgroup with increased mortality risk equivalent to patients with LVEF of 30% or less. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921470 Sat, 24 Oct 2009 12:51:39 +0100 2921470 http://www.medworm.com/index.php?rid=2921464&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003367%2Fabstract%3Frss%3Dyes Conclusions: The metal-clad polymer fibers have advantages over conventional metal cardiac leads in flexibility, weight savings, mechanical strength, durability, and tailored electrical conductivity. Therefore, the combined engineering properties of the new fiber afford implantable cardiac lead applications at reduced diameter while having higher strength. Furthermore, the new fiber can be terminated just like a regular metal wire with the choice of ultrasonic bonding, crimping, or band connection. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921464 Sat, 24 Oct 2009 12:51:37 +0100 2921464 http://www.medworm.com/index.php?rid=2921451&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900257X%2Fabstract%3Frss%3Dyes Abstract: ST-segment elevation is the clinical hallmark of ST-elevation myocardial infarction; however pathophysiologically ST elevation occurs in association with acute coronary occlusion long before any myocardial necrosis occurs, for example. with no myocardial infarction (MI). The clinical utility of these laboratory observations has previously been limited; however, with the advent of permanently implantable high-fidelity electrocardiogram monitors, such utility constitutes a new horizon for high-risk patients. Rapidly progressive changes in the endocardial electrogram, with real-time alarms, could shift the timing, and hence the paradigm of care from interruption of MI to prevention of MI. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921451 Sat, 24 Oct 2009 12:51:35 +0100 2921451 http://www.medworm.com/index.php?rid=3086084&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003744%2Fabstract%3Frss%3Dyes Abstract: To improve malignant arrhythmia risk stratification, the causal and random components of spatiotemporal dynamics of heart rate (RR distances), ventricular depolarization sequence, and repolarization disparity were studied based on body surface potential map records taken for 5 minutes, in resting, supine position on 14 healthy subjects (age range, 20-65 years) and on 6 arrhythmia patients (age range, 59-70 years). Beat-to-beat QRS and QRST integral maps, Karhunen-Loève (KL) coefficients, RR, and nondipolarity index time series were computed. Tight relationship was found between RR and QRS integrals in healthy subjects with less association in arrhythmia patients. Tight KL-domain multiple linear association (r2 > 0.72) was found between the QRS and QRST integral dynamics (ie, dep... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086084 Mon, 12 Oct 2009 00:00:00 +0100 3086084 http://www.medworm.com/index.php?rid=3273636&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900421X%2Fabstract%3Frss%3Dyes Conclusions: The appearance of ST segment hump sign during exercise testing is strongly correlated with diastolic LV dysfunction and can be used as an exercise electrocardiographic index of diastolic LV dysfunction, independently from the echocardiographic study. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273636 Thu, 08 Oct 2009 00:00:00 +0100 3273636 http://www.medworm.com/index.php?rid=3273627&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004233%2Fabstract%3Frss%3Dyes Conclusions: ST-segment depression in lead aVR in inferior wall STEMI predicts LCx infarction or larger RCA infarction involving a large posterolateral branch. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273627 Thu, 08 Oct 2009 00:00:00 +0100 3273627 http://www.medworm.com/index.php?rid=3273637&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003276%2Fabstract%3Frss%3Dyes Abstract: From the electrocardiographic (ECG) point of view, the tako-tsubo cardiomyopathy (TTC) behaves like an acute subepicardial circumferential ischemic syndrome. The electrical manifestations are significantly different from those of acute transmural segmental ischemia, in which the ECG primarily expresses the electrophysiologic and metabolic changes occurring in the subepicardial layer. In comparison with transmural anterior ischemia and despite acute contraction impairment (circumferential middle and apical dyskinesis and basal hyperkinesis), in TTC there is typically only moderate ST elevation in the precordial leads.This paradox can be understood by taking into consideration the molecular biology and basic electrophysiology. In the senescent female with hypoestrogenemia, the sube... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273637 Mon, 05 Oct 2009 00:00:00 +0100 3273637 http://www.medworm.com/index.php?rid=3273630&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004221%2Fabstract%3Frss%3Dyes Abstract: The case of a 41-year-old woman who presented to her primary care physician with atypical chest pain was reported. An electrocardiogram (ECG) was performed in his office and the patient was told she had left bundle-branch block and an old infarct. The patient was very concerned and referred to cardiology for further evaluation/testing. An ECG at the cardiologist's office was normal. The cardiologist however suspected the ECG performed at the primary care physician office to be preexcitation (Wolf-Parkinson-White). During an adenosine nuclear stress test, intermittent preexcited beats occurred transiently to confirm the diagnosis of Wolf-Parkinson-White. Wolf-Parkinson-White can mimic multiple other ECG changes including a pseudoinfarct pattern and hence be misleading. The figure ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273630 Wed, 30 Sep 2009 00:00:00 +0100 3273630 http://www.medworm.com/index.php?rid=3086100&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609004208%2Fabstract%3Frss%3Dyes I enjoyed the interesting electrocardiogram image presented in the September-October issue of the Journal by Drs Hoffmayer and Goldschlager, where apparent “Osborne” waves were caused by dissociated sinus P waves occurring at the end of the junctional QRS complexes. Unfortunately, in this brief presentation, Dr Osborn's name was misspelled 5 times. The cold fact is that his name comes with no “e” at the end; this should be frozen in our minds. Interestingly, you can find the correct spelling of Osborn on page 422 of the same issue, just 1 page ahead of Dr Hoffmayer's and Dr Goldschlager's cool electrocardiogram illustration. We owe Dr Osborn a correct spelling of his name. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086100 Sun, 27 Sep 2009 00:00:00 +0100 3086100 http://www.medworm.com/index.php?rid=3086088&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900377X%2Fabstract%3Frss%3Dyes This report describes an unusual case of moderate but not massive pulmonary embolism presenting with an ECG finding of giant inverted T waves. A review of the common conditions associated with such an ECG is also presented. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086088 Fri, 25 Sep 2009 00:00:00 +0100 3086088 http://www.medworm.com/index.php?rid=3273628&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003720%2Fabstract%3Frss%3Dyes We describe effects of pacing lead position and cardiac microanatomy on electrical pacing parameters. Passive fixation transvenous pacing leads were implanted in anterior interventricular veins in isolated swine hearts (n = 6). Electrical pacing parameters were measured in 3 implant positions (5 implant sites each): touching myocardial side of venous wall, not touching venous wall, and touching epicardial side of venous wall. After perfusion fixing hearts, veins were sectioned perpendicular to vein's length from base to apex. Slides were prepared and analyzed for measurement of vein wall thickness/circumference, and distances between vein walls and myocardium. Average pacing thresholds were greater when pacing leads were free-floating (5.45 ± 3.29 V) or oriented in epicardial positions (6... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3273628 Wed, 16 Sep 2009 00:00:00 +0100 3273628 http://www.medworm.com/index.php?rid=3086086&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003732%2Fabstract%3Frss%3Dyes Conclusion: A selection of T-wave morphology variables is found to be clinically independent of age, sex, and heart rate, including Tpeak-Tend interval, skewness, and kurtosis. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086086 Wed, 09 Sep 2009 00:00:00 +0100 3086086 http://www.medworm.com/index.php?rid=2921527&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003719%2Fabstract%3Frss%3Dyes Conclusions: Internal medicine residents at the beginning of their residency training demonstrated low overall proficiency in interpreting ECGs and self-perceived confidence. Nearly all residents felt that their training was insufficient. These findings emphasize the need for improved and more effective training in ECG interpretation for physicians starting residency. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921527 Tue, 08 Sep 2009 23:00:00 +0100 2921527 http://www.medworm.com/index.php?rid=2921463&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003379%2Fabstract%3Frss%3Dyes Conclusions: Apical pacing is associated with prolonged P-wave duration relative to septal pacing and controls: this may manifest as increased risk of atrial tachycardias and presents a potentially novel benefit of septal pacing. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921463 Sun, 06 Sep 2009 23:00:00 +0100 2921463 http://www.medworm.com/index.php?rid=2921519&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003380%2Fabstract%3Frss%3Dyes We describe a case of spontaneous pneumothorax presenting with symptomatic high-degree AV block and subsequent electrophysiologic diagnosis of hypervagotonia. The patient had complete resolution of his bradycardia and AV block after chest tube placement. This case is intended to alert cardiologists to this rare presentation of spontaneous pneumothorax. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921519 Wed, 02 Sep 2009 23:00:00 +0100 2921519 http://www.medworm.com/index.php?rid=3086091&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003768%2Fabstract%3Frss%3Dyes I enjoyed very much reading the study by Doshi and Idriss published ahead of print in the Journal of Electrocardiology on July 16, 2009, because these authors embarked to explore fundamental issues pertaining to T-wave alternans (TWA) by using a 1-dimensional myocardial fiber computer model. One hopes that by using simple myocardial models, several outstanding issues that encumber the TWA technology may become eventually unraveled. Some of them include the following: (1) whether the magnitude of TWA is of any physiologic significance or the mere detection of the phenomenon above the noise level, or an agreed-upon threshold (eg, ≤1.9 μV) suffices for characterization of a serious proarrhythmic risk; (2) the short-term reproducibility (hours to days, to few weeks) of TWA in patients who a... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086091 Wed, 02 Sep 2009 00:00:00 +0100 3086091 http://www.medworm.com/index.php?rid=2921455&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002532%2Fabstract%3Frss%3Dyes Abstract: Instabilities of the STT segment's magnitude, and particularly the 0.5 beat/cycle oscillations (T-wave alternans, or TWA), have been linked to the heightened risk of ventricular tachyarrhythmias (VTA) and sudden cardiac death (SCD). During the last decade theoretical, experimental and clinical research efforts have focused primarily on TWA, examining its mechanisms and predictive value using time-invariant cutoff values. However, recent evidence suggests that such a single-snapshot test of a single-frequency (TWA) oscillation using a constant cutoff value might be suboptimal for risk stratification because of several reasons.First, it is well known that the risk of VTA/SCD evolves over time with changes in electrophysiologic substrate, environmental and physiologic triggers, and ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921455 Sun, 30 Aug 2009 23:00:00 +0100 2921455 http://www.medworm.com/index.php?rid=2921452&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002647%2Fabstract%3Frss%3Dyes Abstract: Cellular and macroelectrical instability within the heart ventricles during repolarization is described as a potential triggering mechanism of life-threatening arrhythmias. Although this phenomenon was observed in animal and in vitro studies, significant efforts have been put into the design of computerized technologies to quantify very subtle variations of the repolarization signal from the surface electrocardiograms. These technologies aim at capturing repolarization instability of ventricular repolarization while controlling for the normal variability. Currently, the methods have focused on the autonomic regulation of the heart rate as a primary confounding factor (such as in the QT variability index). However, there are other factors that can influence the measurements of bea... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921452 Sun, 30 Aug 2009 23:00:00 +0100 2921452 http://www.medworm.com/index.php?rid=2921465&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003240%2Fabstract%3Frss%3Dyes Conclusions: An AC-coupled ECG amplifier based on a first-order analogue HPF must have a maximum cutoff frequency of 0.05 Hz or requires a phase equalizer causing a delay of the acquired ECG. Because the desired delay during online acquisition should be short, the solution is practical but could be improved. Not the frequency cutoff of the HPF but the phase distortion of such a filter should be discussed. The DC-coupled ECG amplifier is as safe as the AC-coupled ECG amplifier; but it provides a higher degree of freedom for future filter designs certainly improving the ECG signal quality, while the safety can be guaranteed. Furthermore, the DC-coupled ECG amplifier allows investigation of the HPF, which is not easily possible when an AC-coupled ECG amplifier including the HPF is to be inves... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921465 Sun, 23 Aug 2009 23:00:00 +0100 2921465 http://www.medworm.com/index.php?rid=2921459&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002799%2Fabstract%3Frss%3Dyes Conclusions: The study provided preliminary results showing the usefulness of the cell-to-ECG model for studying relationship between multiple ion-channel factors with ECG morphology changes. The global and localized TDR generate very different T wave morphologies. The newly identified T wave morphology parameters are highly correlated with transmural dispersion and are heart rate independent. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921459 Sun, 23 Aug 2009 23:00:00 +0100 2921459 http://www.medworm.com/index.php?rid=2921454&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003239%2Fabstract%3Frss%3Dyes Abstract: We previously showed that increased intracardiac repolarization lability predicts life-threatening ventricular arrhythmias in patients with structural heart disease. Patients with structural heart disease frequently take antiarrhythmic drugs (AADs), which directly affect repolarization. The effect of AADs on the predictive value of repolarization lability is unknown. We hypothesized that increased intracardiac beat-to-beat QT variability predicts sustained ventricular tachyarrhythmias in structural heart disease patients on class III AADs. Intracardiac electrograms and surface electrocardiogram were simultaneously recorded at rest for 5 minutes in 500 patients (mean ± SD age, 61 ± 14 years; 368 male [74%]) with implanted implantable cardioverter-defibrillator for primary (295 p... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921454 Sun, 23 Aug 2009 23:00:00 +0100 2921454 http://www.medworm.com/index.php?rid=3086098&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002817%2Fabstract%3Frss%3Dyes We describe a rare electrocardiographic finding that suggested ST-elevation acute coronary syndrome of the anterior zone due to left main trunk total occlusion. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086098 Fri, 21 Aug 2009 00:00:00 +0100 3086098 http://www.medworm.com/index.php?rid=3086097&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002805%2Fabstract%3Frss%3Dyes Abstract: A 46-year-old man with type II Brugada electrocardiogram pattern changed to a type I Brugada type electrocardiogram pattern by class I antiarrhythmic drug (pilsicainide) underwent electrophysiologic study. Ventricular fibrillation was induced by double extrastimuli from the right ventricular (RV) apex. Monophasic action potentials (MAPs) were then recorded from the high right atrium. Duration of MAP at a coupling interval of 220 milliseconds was 122 milliseconds, and local activation of S2 spread to the left atrium. However, MAP at a coupling interval of 210 milliseconds was 112 milliseconds, and local activation of S2 failed to spread to the rest of atrium. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086097 Fri, 21 Aug 2009 00:00:00 +0100 3086097 http://www.medworm.com/index.php?rid=2921526&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003288%2Fabstract%3Frss%3Dyes Abstract: Interatrial block (IAB) is defined as delayed conduction between the right and left atrium, which results in prolonged P-wave duration (≥110 milliseconds). Interatrial block can be partial or advanced (much less common), depending on the severity of the conduction abnormality. Several studies have reported that the prevalence of IAB is more than 40% in hospital inpatients. Despite this, IAB remains largely underdiagnosed and commonly ignored. Although more investigations are needed to identify the cause of IAB, coronary artery disease and conditions related to cardiovascular disease, such as hypertension or diabetes mellitus, have been described as potential risk factors for developing IAB. Interatrial block has strong associations with multiple medical conditions including atr... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921526 Thu, 20 Aug 2009 23:00:00 +0100 2921526 http://www.medworm.com/index.php?rid=2921460&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002751%2Fabstract%3Frss%3Dyes Abstract: Pharmacological management of atrial fibrillation (AF) remains an important unmet medical need. Because available drugs for rhythm control of AF are often associated with a significant risk for development of ventricular arrhythmias or extracardiac toxicity, recent drug development has focused on agents that are atrial selective. Inhibition of the ultrarapid delayed rectifier potassium current (IKur), a current exclusive to atria, is an example of an atrial-selective approach. Recent studies, however, have shown that loss-of-function mutations in KCNA5, the gene that encodes KV1.5, the α subunit of the IKur channel, is associated with the development of AF and that inhibition of IKur can promote the induction of AF in experimental models. Another potential atrial-selective appro... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921460 Thu, 20 Aug 2009 23:00:00 +0100 2921460 http://www.medworm.com/index.php?rid=2921456&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002787%2Fabstract%3Frss%3Dyes Conclusions: The AF-Toolbox that is currently developed for clinical applications has the potential of reliably detecting and classifying AF, as well as to correctly describe atrioventricular conduction, propagation blocks and/or ectopic beats. Based on the results obtained, a first industrial prototype has been built, which will be used to assess its performance in a routine clinical environment. The availability of this tool will facilitate the search for meaningful signal features for identifying the source of AF in individual patients. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921456 Thu, 20 Aug 2009 23:00:00 +0100 2921456 http://www.medworm.com/index.php?rid=2921449&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002775%2Fabstract%3Frss%3Dyes This study evaluated the feasibility of remote surveillance of coronary care unit and cardiology ward patient monitoring data by a “telecardiologist” with access to electronic health care record data and digitally stored 12-lead electrocardiograms. The remote access to the hospital intranet proved to be technically feasible. Also, the server applications used over the remote connection proved to be reliable and showed robustness against network performance variations. Extending remote patient surveillance to other hospitals is possible, provided that similar electrocardiogram and electronic health care record applications are available and a remote access can be arranged to them. However, the usability from cardiologist's perspective may be degraded if connecting with multiple applicat... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921449 Thu, 20 Aug 2009 23:00:00 +0100 2921449 http://www.medworm.com/index.php?rid=2713801&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002866%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713801 Thu, 20 Aug 2009 10:09:50 +0100 2713801 http://www.medworm.com/index.php?rid=2713800&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002854%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713800 Thu, 20 Aug 2009 10:09:50 +0100 2713800 http://www.medworm.com/index.php?rid=2713798&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609003185%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713798 Thu, 20 Aug 2009 10:09:50 +0100 2713798 http://www.medworm.com/index.php?rid=2713780&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900260X%2Fabstract%3Frss%3Dyes In this issue of the Journal of Electrocardiology, the editorial by Dr Bacharova outlines an initiative for upgrading electrocardiophic (ECG) standards for left ventricular hypertrophy (LVH). The editorial starts with a critique of the recent American Heart Association (AHA)/American College of Cardiology Foundation/Heart Rhythm Society “Recommendations for the standardization and interpretation of the electrocardiogram, part V: electrocardiogram changes associated with cardiac chamber hypertrophy.” (The part of the report dealing with LVH is called here AHA Writing Group V document.) In her editorial, Dr Bacharova outlines a rational for upgrading the LVH recommendations as a guideline for the new working group charged with undertaking this task. I was invited to present a second view... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713780 Thu, 20 Aug 2009 10:09:47 +0100 2713780 http://www.medworm.com/index.php?rid=2713779&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900274X%2Fabstract%3Frss%3Dyes In the March issue of the Journal of Electrocardiology, an important announcement on the initiative to elaborate the recommendations on the standardization of recording and interpretation of the electrocardiogram (ECG) was published. The intention was to update them periodically according to the development of ECG due to new technologies, new techniques, and new information/knowledge. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713779 Thu, 20 Aug 2009 10:09:47 +0100 2713779 http://www.medworm.com/index.php?rid=2713778&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002611%2Fabstract%3Frss%3Dyes Abstract: In this brief tribute to Barney Marriott, I wanted to share the story of his life both personal and professional. Barney was a great man, friend, physician, mentor, teacher, and/or colleague to thousands of physicians, nurses, technicians, and industry groups worldwide, many of whom may not be aware of his passing on August 31, 2007. One simply could not have gotten through cardiology training at any level without having been exposed to 1 of his 21 textbooks or his 140 plus journal articles, or historical electrocardiogram (ECG) workshops. Barney was rightfully so labeled the “Father of Electrocardiography,” and his book Practical Electrocardiography, the bible of electrocardiography. When asked who will take his place, my response is that he is simply irreplaceable. All his ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713778 Thu, 20 Aug 2009 10:09:47 +0100 2713778 http://www.medworm.com/index.php?rid=2921518&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002738%2Fabstract%3Frss%3Dyes Abstract: The vagal maneuver is the first line of therapeutic available for patients with paroxysmal supraventricular tachycardia. It increases vagal tone and includes the traditional ocular compression, carotid sinus massage, and Valsalva maneuver.A 40-year-old man was admitted because of 180 beats/min regular narrow QRS-complex tachycardia. The physician in the emergency department had performed an ocular compression, and at its ending, the tachycardia degenerated into unstable hemodynamically high ventricular rate atrial fibrillation. It was reverted to sinus rhythm by electrical shock. The electrophysiologic study documented a latent posterolateral bypass tract, with an anterograde refractory period of 210 milliseconds, which was successfully ablated. (Source: Journal of Electrocardiol... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921518 Sun, 16 Aug 2009 23:00:00 +0100 2921518 http://www.medworm.com/index.php?rid=2921513&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002568%2Fabstract%3Frss%3Dyes Abstract: A 84-year-old man presented to the emergency department complaining of chest pain and palpitations. He had no history of coronary artery disease. The 12-lead electrocardiography showed bidirectional ventricular tachycardia (BVT). Coronary angiography revealed severe mid left anterior descending and mid left circumflex lesions. The BVT, in this case, was most likely due to myocardial ischema. The ethiology of published BVT cases are most commonly digitalis toxicity and rarely herbal aconitine poisoning, hypokalemic periodic paralysis, cathecolaminergic VT, myocarditis, and Anderson-Tawil syndrome. The patient had neither of these underlying conditions. To the best of our knowledge and research in the literature, there was no report of bidirectional VT in the patients with myocardi... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921513 Sun, 16 Aug 2009 23:00:00 +0100 2921513 http://www.medworm.com/index.php?rid=3086101&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002623%2Fabstract%3Frss%3Dyes The evaluation of electrocardiographic (ECG) repolarization signals is used in a number of different applications. These range from the assessment of drug-induced repolarization changes to the identification of cardiac patients at increased arrhythmic risks. Examples of several of such applications have been recently presented in the issue of the journal devoted to the “Mini-symposium on ventricular repolarization indices of VT/VF vulnerability.” Among these, Panicker et al reported on the comparison of threshold and tangent methods for QT interval measurement in ECGs used to evaluate drug-induced QTc prolongation. They based their comparison of the methods on intrasubject and intersubject reproducibility. The suggestions made by Panicker et al have possible implications in other areas... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086101 Mon, 10 Aug 2009 00:00:00 +0100 3086101 http://www.medworm.com/index.php?rid=3086082&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002763%2Fabstract%3Frss%3Dyes Conclusions: Most pediatric cardiologists in North America remain skeptical about ECG screening of infants for LQTS. Among pediatric cardiologists, current support for ECG screening at pediatrician's offices is low, and only 10% would agree to a mandate for ECG screening. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086082 Mon, 10 Aug 2009 00:00:00 +0100 3086082 http://www.medworm.com/index.php?rid=2921471&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002672%2Fabstract%3Frss%3Dyes Abstract: Signals generated by biologic systems are characterized by a high degree of nonstationarities and noise. Phase-rectified signal averaging (PRSA) was shown to be superior to conventional methods in detection of periodicities in biologic signals. Bivariate phase-rectified signal averaging (BPRSA) is an extension of the PRSA-method for analysis of interrelationships between 2 synchronously recorded biologic signals. Here, we review the methodology of the technique and demonstrate its performance in simulated data. As application to biologic data, we use BPRSA to analyze synchronously recorded time series of systolic arterial blood pressure, RR intervals, and respiratory activity. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921471 Sun, 09 Aug 2009 23:00:00 +0100 2921471 http://www.medworm.com/index.php?rid=2921466&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002684%2Fabstract%3Frss%3Dyes Abstract: Implantable loop recorders (ILRs) are used for continuous assessment of patients at risk for syncope and arrhythmia. Device accuracy depends on appropriate sensing of the patient's electrocardiogram (ECG) signal. However, current methods for sensing cardiac electrical activity rely on simple threshold detectors that are computationally efficient but nonspecific.We test the hypothesis that better ILR implant positions will increase detection accuracy. Ten healthy subjects were studied as they assumed 12 different postures. Body surface potential map (BSM) recordings were used to estimate bipolar R-wave amplitudes for 64 potential implant sites at 360 orientations per site. Optimal sites were identified as the combination of position and orientation that consistently gave the large... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921466 Sun, 09 Aug 2009 23:00:00 +0100 2921466 http://www.medworm.com/index.php?rid=2921453&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002660%2Fabstract%3Frss%3Dyes Conclusions: Repolarization lability as reflected in QT variability has a pronounced diurnal variation and increases significantly after 6 am, the time of greatest arrhythmic risk. QT variability for 24 hours might improve risk prediction in chronic heart failure patients and should be tested in appropriate trials. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921453 Sun, 02 Aug 2009 23:00:00 +0100 2921453 http://www.medworm.com/index.php?rid=2921468&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002520%2Fabstract%3Frss%3Dyes Abstract: The electrocardiographic diagnosis of left ventricular hypertrophy (LVH) has been centered on improving the diagnostic sensitivity and specificity of the method, using criteria whose precise relationship to increased left ventricular mass are not established. Although the electrocardiogram (ECG) has been displaced to a secondary role in the prediction of left ventricular mass, ECG/LVH has been shown to be a strong predictor of morbidity and early mortality. There are strong clues that each of the parameters in ECG/LVH is related to cardiac contractility and ejection. It is suggested that research be redirected to an exploration of these relationships and predicted that this will lead to both a better understanding of this venerable tool and an improvement in its usefulness to the... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921468 Wed, 29 Jul 2009 23:00:00 +0100 2921468 http://www.medworm.com/index.php?rid=2921462&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002544%2Fabstract%3Frss%3Dyes Conclusion: In patients with STEMI undergoing pPCI, pre-PCI TpTe predicted subsequent all-cause mortality, and the QT interval was increased after the procedure. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921462 Wed, 29 Jul 2009 23:00:00 +0100 2921462 http://www.medworm.com/index.php?rid=2921467&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002659%2Fabstract%3Frss%3Dyes Conclusions: Regression of ECG LVH by Cornell product and/or Sokolow-Lyon voltage criteria during antihypertensive therapy is associated with lower likelihoods of CV morbidity and mortality, all-cause mortality, and new-onset diabetes, independent of blood pressure lowering and treatment modality in essential hypertension. These findings suggest that antihypertensive therapy targeted at regression or prevention of ECG LVH may improve prognosis. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921467 Sun, 26 Jul 2009 23:00:00 +0100 2921467 http://www.medworm.com/index.php?rid=2921450&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002635%2Fabstract%3Frss%3Dyes Abstract: The AngelMed Guardian is an implantable medical device that records cardiac data and detects ischemic events using a standard pacemaker intracardiac lead positioned in the right ventricular apex. The Guardian has been implanted in 55 people in the United States and Brazil and is currently undergoing a Food and Drug Administration phase 2 pivotal trial in the United States. The Guardian detects acute ischemic events by analyzing ST-segment shifts. The ST-segment shifts are calculated as the difference between the ST deviation of a current 10-second electrogram window and a baseline ST deviation value. If the ST-segment shift is greater than a heart rate–dependent programmable threshold, then the device generates an emergency alert signal. Results thus far have demonstrated that ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921450 Sun, 26 Jul 2009 23:00:00 +0100 2921450 http://www.medworm.com/index.php?rid=2921458&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002556%2Fabstract%3Frss%3Dyes In this study, a number of physiologic indicators of ventricular fibrillation (VF) duration were investigated.The bispectral index was recorded at 15-second intervals over 12 minutes and recordings of the atrial electrocardiogram and lead II electrocardiogram were acquired simultaneously using Notocord data acquisition software during sinus rhythm, ventricular tachycardia, and VF, and analyzed using a total of 30 porcine models. A number of frequency markers (fast Fourier transform and density and amplitude of peaks [DA]) were derived. There was a direct relationship between VF duration and bispectral index with a Pearson correlation coefficient (mean) of r = −0.91. The P-P interval recorded in the atria during VF, demonstrated similar findings (r = 0.97) when measured against VF durati... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921458 Thu, 23 Jul 2009 23:00:00 +0100 2921458 http://www.medworm.com/index.php?rid=2921461&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002593%2Fabstract%3Frss%3Dyes Abstract: T-wave alternans (TWA) is a useful marker of cardiac instability, but not much is known about the factors that affect its measurement, such as electrode placement. We used a 1-dimensional myocardial fiber computer model of alternans to investigate the effect of electrode position on TWA measurement. Results demonstrated that TWA amplitude and T-wave amplitude change proportionally if both recording electrodes are symmetrically moved toward or away from the tissue. However, TWA amplitude and T-wave amplitude change out of proportion to one another when one electrode is moved while the other electrode remains stationary. These disproportionate changes result from beatwise alternation in the asymmetric potential field around the tissue. In summary, nonlinear changes in tissue repola... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921461 Mon, 20 Jul 2009 23:00:00 +0100 2921461 http://www.medworm.com/index.php?rid=3086090&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002490%2Fabstract%3Frss%3Dyes Conclusion: Filtered QRS duration provided more reliable information to estimate ventricular dyssynchrony in patients with reduced ventricular ejection fraction than QRS duration did. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086090 Thu, 16 Jul 2009 00:00:00 +0100 3086090 http://www.medworm.com/index.php?rid=3086089&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002489%2Fabstract%3Frss%3Dyes Conclusions: The U wave seems to be a regular phenomenon and has a distinct spatiotemporal assembly. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086089 Thu, 16 Jul 2009 00:00:00 +0100 3086089 http://www.medworm.com/index.php?rid=2921512&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900140X%2Fabstract%3Frss%3Dyes We present a statistical approach to transform 3-lead Frank VCG to 12-lead ECG signals and vice versa, based on Dower's pioneering work on lead tranformation. This approach enables compensation of baseline shifts and other constant biases present in long ECG data streams, so that the resulting statistical transforms can be more consistent and accurate. We compare the performance of the affine transform with that of Dower transform (from 3 to 12 and from 12 to 3) using the data from the PhysioNet PTB database.Results: The results show that for both myocardial infarction (MI) and healthy control (HC) subjects, the statistical affine transform presented here maps 3-lead VCG to12-lead ECG more accurately than Dower or other lead transformation matrices of the ECG recordings.Discussion: This in... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921512 Wed, 15 Jul 2009 23:00:00 +0100 2921512 http://www.medworm.com/index.php?rid=2921469&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002519%2Fabstract%3Frss%3Dyes Abstract: The problem of discrepancies between left ventricular mass (LVM) and electrocardiography (ECG) findings in diagnosis of left ventricular hypertrophy (LVH) is approached from the perspective of the diagnostic ability of ECG. Contrary to current clinical understanding of LVH as an increase in LVM, the LVH is defined as the organ manifestation of the hypertrophic growth of cardiomyocytes accompanied by changes in interstitium. This complex understanding of the hypertrophic rebuilding of LV myocardium in LVH is the crucial requirement to understand the role of ECG in LVH diagnosis. The basic statements of the article are based on the fact that ECG provides information on the electrical field generated by the heart; therefore, (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921469 Wed, 15 Jul 2009 23:00:00 +0100 2921469 http://www.medworm.com/index.php?rid=2921457&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002507%2Fabstract%3Frss%3Dyes This article reports our experience in developing a real-time AF monitoring algorithm and techniques to eliminate false-positive AF alarms. We start by designing an algorithm based on R-R intervals. This algorithm uses a Markov modeling approach to calculate an R-R Markov score. This score reflects the relative likelihood of observing a sequence of R-R intervals in AF episodes versus making the same observation outside AF episodes. Enhancement of the AF algorithm is achieved by adding atrial activity analysis. P-R interval variability and a P wave morphology similarity measure are used in addition to R-R Markov score in classification. A hysteresis counter is applied to eliminate short AF segments to reduce false AF alarms for better suitability in a monitoring environment. A large ambulat... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921457 Wed, 15 Jul 2009 23:00:00 +0100 2921457 http://www.medworm.com/index.php?rid=2921524&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002404%2Fabstract%3Frss%3Dyes Conclusion: Large T-wave amplitudes in static pre- and post-PCI ECGs are associated with delayed microvascular reperfusion, whereas the dynamic development of more negative T waves during PCI is associated with earlier microvascular reperfusion. However, in the acute setting, T waves provide little incremental information when compared to ST parameters available in the per-interventional phase. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921524 Sun, 12 Jul 2009 23:00:00 +0100 2921524 http://www.medworm.com/index.php?rid=2713797&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002350%2Fabstract%3Frss%3Dyes Conclusions: Applying the guideline criteria for the interpretation of cECG enhanced cECG diagnostic value in surgical patients. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713797 Sun, 12 Jul 2009 23:00:00 +0100 2713797 http://www.medworm.com/index.php?rid=2921516&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002398%2Fabstract%3Frss%3Dyes Conclusions: Extended-length ECG can be considered an effective, low-cost, and low time-consuming clinical tool for distinguishing between PLVH and HCM. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921516 Sun, 05 Jul 2009 23:00:00 +0100 2921516 http://www.medworm.com/index.php?rid=2713795&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001381%2Fabstract%3Frss%3Dyes We report a case of a 51-year-old man with chest pain, sweating, and breathlessness for a few hours. He was a smoker, reporting neither history of heart disease nor other cardiovascular risk factors: he was not receiving any drug therapy. At emergency room, an electrocardiogram (ECG) showed an unusual type of ST-segment depression in V2-V6 leads, thus suggesting an involvement of left anterior descending (LAD) coronary artery (). Systolic arterial blood pressure at admission was 90/60 mm Hg, and physical examination was unremarkable. Chest radiography showed no sign of pulmonary congestion, with a normal cardiac transverse diameter. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713795 Sun, 05 Jul 2009 23:00:00 +0100 2713795 http://www.medworm.com/index.php?rid=3086094&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002374%2Fabstract%3Frss%3Dyes Conclusions: By incorporating a patient responsiveness test, as well as features that eliminate or reduce signal interference common to external electrocardiogram electrodes, the WCD detection algorithm has a low risk of inappropriate shocks. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086094 Wed, 01 Jul 2009 00:00:00 +0100 3086094 http://www.medworm.com/index.php?rid=2921525&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002386%2Fabstract%3Frss%3Dyes We present the case of a 72-year-old man who was admitted because of acute ST-segment elevation myocardial infarction and presented with second-degree atrioventricular block with 4:2 conduction. We propose 3 alternative explanations for such an unusual conduction pattern: (1) supernormal conduction, (2) 2-level block with 4:1 conduction ratio in the upper level and 3:2 conduction ratio in the lower level, and (3) presence of 2 populations of Purkinje cells in the remaining, critically injured fascicle, one with the phase-3 block and the other with slow diastolic depolarization, leading, during a pause after the first nonconducted P, to phase-4 block. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921525 Tue, 30 Jun 2009 23:00:00 +0100 2921525 http://www.medworm.com/index.php?rid=2921517&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002349%2Fabstract%3Frss%3Dyes We present a case of right ventricular infarct mimicking, on the electrocardiogram, an anterior myocardial infarction. The Grant method of vector electrocardiography is a seldom used tool but is a very accurate way of evaluating electrocardiograms and is as useful adjunct to pattern recognition. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921517 Tue, 30 Jun 2009 23:00:00 +0100 2921517 http://www.medworm.com/index.php?rid=2713799&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609002362%2Fabstract%3Frss%3Dyes Conclusion: A simple dipole model may be a useful descriptor of ST-segment deviations, reducing ST deviation measurements from 12 leads to a single 3-dimensional vector. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713799 Tue, 30 Jun 2009 23:00:00 +0100 2713799 http://www.medworm.com/index.php?rid=2713786&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001411%2Fabstract%3Frss%3Dyes We report an erratum in the September/October 2007 issue (40/5) of Journal of Electrocardiology (page 391). We published an editorial by Jerry Liebman titled “The early repolarization syndrome is a variation of normal” (2007;40:391; doi:10.1016/j.electrocard.2007.07.013). Dr Liebman had been requested to write an editorial response to the article by Boineau et al that appeared in the January/February 2007 issue (40/1). The editorial was originally published by mistake as a “Letter to the Editor.” (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713786 Tue, 30 Jun 2009 23:00:00 +0100 2713786 http://www.medworm.com/index.php?rid=2487044&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001459%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2487044 Thu, 25 Jun 2009 07:26:42 +0100 2487044 http://www.medworm.com/index.php?rid=2487043&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001447%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2487043 Thu, 25 Jun 2009 07:26:42 +0100 2487043 http://www.medworm.com/index.php?rid=2487042&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001897%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2487042 Thu, 25 Jun 2009 07:26:42 +0100 2487042 http://www.medworm.com/index.php?rid=2487036&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001368%2Fabstract%3Frss%3Dyes From his daughter, Dianne Anderson, with thanks to Dr. Elton Fagan: (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2487036 Thu, 25 Jun 2009 07:26:42 +0100 2487036 http://www.medworm.com/index.php?rid=2487034&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609000612%2Fabstract%3Frss%3Dyes Conclusions: Cardiac resynchronization therapy decreases PWM and PWD along with an improvement of LVEF and a reduction of LAD. Further studies are needed to evaluate the clinical implications of decrease of PWD on prevention of atrial fibrillation. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2487034 Thu, 25 Jun 2009 07:26:42 +0100 2487034 http://www.medworm.com/index.php?rid=2487031&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001307%2Fabstract%3Frss%3Dyes While working on some of the references quoted in our article recently published in the Journal of Electro-cardiology, we realized that the first part of the Introduction is identical to the introductory sentence of a previous study by Li and coworkers published in Circulation Research and quoted in our article as reference number 22. We are very sorry for this apparent inappropriate writing, but this happened in total good faith. The first author of our article passed away a year ago, and we, actually, decided to revive this work in his memory. We believe that Mauro Bertella never had the chance to edit the introduction and, probably, took the firsts sentences from the article by Li with idea to keep the concept and edit the text. When we revised the manuscript, we did not detect the prob... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2487031 Thu, 25 Jun 2009 07:26:42 +0100 2487031 http://www.medworm.com/index.php?rid=3086092&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001393%2Fabstract%3Frss%3Dyes In this study, we used statistical estimation method to map the endocardial and epicardial surfaces simultaneously based on combined usage of the MBC and MIVC. The statistical estimation method is based on high-resolution training data set to hypothesize the relationship between catheter measurements and inaccessible sites. To test this approach, we created a high-resolution map database consisting of computer simulation results of Aliev-Panfilov model of cardiac electrical activity on 3-dimensional Auckland canine heart geometry. The simulation database included 2590 maps each paced from a unique endocardial or epicardial site. Fifty or five percent of the database was used as the training data set and the remaining as test data set in the statistical estimation procedure. We selected 64 ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086092 Fri, 19 Jun 2009 00:00:00 +0100 3086092 http://www.medworm.com/index.php?rid=2713796&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001332%2Fabstract%3Frss%3Dyes Intracoronary (IC) leads have been shown to project local ischemia during percutaneous transluminal coronary angioplasty. Transient compromise in antegrade blood flow during balloon inflation causes alterations in the amplitude of the R wave and duration of the QT interval on the surface 12-lead electrocardiogram (ECG). In our article titled “R-wave Amplitude During Transmural Ischemia,” we briefly presented the changes in R-wave amplitude recorded through an IC-lead during balloon inflation in 4 patients. Subsequently, 4 letters to the editor were published showing interest in our results and expressed legitimate criticism to the IC-tracing presented in our article. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713796 Thu, 18 Jun 2009 23:00:00 +0100 2713796 http://www.medworm.com/index.php?rid=2921521&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001150%2Fabstract%3Frss%3Dyes Abstract: Atrial fibrillation is now the most common arrhythmia in clinical practice. Recent understanding of the abnormalities in ion flow that underlie atrial fibrillation has led to the search for new treatment options with improved efficacy and tolerability. The purpose of this article is to review the role of ion channels in the development of atrial fibrillation and discuss the nature of their inhibition by investigational antiarrhythmic agents. Novel treatments include the benzofuran derivative dronedarone, atrial-selective compounds (eg, vernakalant), multichannel blocking agents (eg, tedisamil), and gap junction modifiers (eg, rotigaptide). Targeted antiarrhythmic therapies have the potential to provide safer and more effective management options for patients with atrial fibrillat... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921521 Thu, 11 Jun 2009 23:00:00 +0100 2921521 http://www.medworm.com/index.php?rid=3086096&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001290%2Fabstract%3Frss%3Dyes This report demonstrates a case of delayed cardiac perforation after implantation of the St Jude Medical Durata implantable cardioverter-defibrillator lead. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086096 Thu, 11 Jun 2009 00:00:00 +0100 3086096 http://www.medworm.com/index.php?rid=2921523&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900137X%2Fabstract%3Frss%3Dyes We present the case of a 34-year-old man showing atrioventricular nodal reentrant tachycardia with left bundle-branch block/right axis deviation as an exception to this rule. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921523 Wed, 10 Jun 2009 23:00:00 +0100 2921523 http://www.medworm.com/index.php?rid=2921522&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001320%2Fabstract%3Frss%3Dyes We report intracardiac recordings compatible with a reversal of activation of the left basal interventricular septum during intermittent left bundle-branch block. In our case, however, retrograde activation into the left bundle-branch cannot be recordable, probably due to the concealment within the muscular septal activation, even if this may explain the perpetuation of bundle-branch block according to the linking phenomenon. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2921522 Wed, 10 Jun 2009 23:00:00 +0100 2921522 http://www.medworm.com/index.php?rid=2713794&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001356%2Fabstract%3Frss%3Dyes Abstract: In a 66-year-old male with subacute extensive anterior wall myocardial infarction, we report a change in ST vector orientation from a basal anterior to a mid anterior after coronary artery recanalization of the proximal left anterior descending coronary artery with rotational atherectomy. The ST vector shift on the frontal plane after recanalization was consistent with a change toward more distal location of the ischemia on thallium-201 single photon emission computed tomography images compared to the findings during an exercise test before intervention. These findings may be correlated with local occlusion caused by distal microvascular embolization which was not visualized on coronary angiography following recanalization. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713794 Wed, 10 Jun 2009 23:00:00 +0100 2713794 http://www.medworm.com/index.php?rid=2713793&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001344%2Fabstract%3Frss%3Dyes Conclusion: ST-segment elevation ≥0.5 mm in lead aVL without STE ≥1 mm in lead V1 may be useful to distinguish STE-AMI caused by occlusion of the D1 from STE-AMI caused by occlusion of the LAD. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713793 Wed, 10 Jun 2009 23:00:00 +0100 2713793 http://www.medworm.com/index.php?rid=2713790&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001125%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713790 Wed, 10 Jun 2009 23:00:00 +0100 2713790 http://www.medworm.com/index.php?rid=2713787&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001149%2Fabstract%3Frss%3Dyes We describe 3 patients with increased intracranial pressure caused by different cerebral pathologies accompanied by the dynamic formation of J waves in time. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713787 Wed, 10 Jun 2009 23:00:00 +0100 2713787 http://www.medworm.com/index.php?rid=2713782&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001319%2Fabstract%3Frss%3Dyes Conclusion: The effect of different extreme breath-holding positions on the QRS complex is on average small but may be substantial in individuals. Lack of standardization of breathing instructions during recording of the ECG may result in differences in application of amplitude criteria and poorer reproducibility. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713782 Wed, 10 Jun 2009 23:00:00 +0100 2713782 http://www.medworm.com/index.php?rid=2713781&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001162%2Fabstract%3Frss%3Dyes Electrocardiographic (ECG) P-wave analysis has long been used to study the atrial electrical activity in the heart. Scalar and vectorial P-wave measurements have been proposed to delineate the atrial electrical phenomena and to estimate atrial volumes and function. Because modern imaging modalities can assess atrial hemodynamics adequately, current P-wave analysis is dedicated in the study of atrial conduction and the mechanisms for the initiation of tachyarrhythmias. The present report aims to provide an overview of what is considered to be the current morphologic and vectorial aspects of P-wave analysis. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713781 Tue, 02 Jun 2009 23:00:00 +0100 2713781 http://www.medworm.com/index.php?rid=3086095&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001113%2Fabstract%3Frss%3Dyes In this report, we present a case of a patient with recurrent ventricular tachycardia degeneration to ventricular fibrillation by appropriate low-energy implantable cardioverter-defibrillator shocks. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=3086095 Mon, 18 May 2009 00:00:00 +0100 3086095 http://www.medworm.com/index.php?rid=2713792&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609001101%2Fabstract%3Frss%3Dyes Conclusions: Greater ST elevation in lead III than in II, greater ST depression in aVL than I, and an S/R ratio of greater than 1:3 in aVL were not useful to discriminate between dominant RCA and dominant LCx occlusion-related inferior AMI. ST-segment deviation in lead V4R and the ratio of ST↓V3/ST↑III were useful in predicting the dominant artery occlusion-related inferior AMI. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713792 Sun, 17 May 2009 23:00:00 +0100 2713792 http://www.medworm.com/index.php?rid=2713791&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609000752%2Fabstract%3Frss%3Dyes Conclusions: Physicians, hospital systems, and emergency medical services often lack coordination of care delivery and receive fragmented funding and oversight. Clinical and regulatory guidelines do not emphasize local solutions to achieving clinical benchmarks, do not target incentives at all components of the STEMI-CS, and underemphasize risk-based approaches to protecting patient health. Integration of the multiple complex components involved in STEMI-CS is essential to improving care delivery. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2713791 Sun, 17 May 2009 23:00:00 +0100 2713791 http://www.medworm.com/index.php?rid=2370527&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360900079X%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2370527 Tue, 28 Apr 2009 23:51:18 +0100 2370527 http://www.medworm.com/index.php?rid=2370526&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073609000843%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2370526 Tue, 28 Apr 2009 23:51:18 +0100 2370526 http://www.medworm.com/index.php?rid=2370525&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207360800486X%2Fabstract%3Frss%3Dyes The study by Idriss and Bell, published in the November to December 2008 issue of the Journal, set out to separate the genetic predisposition to fatal arrhythmias from the age-dependent factors leading to such outcome. To that purpose, they studied the rate-dependent changes in repolarization seen as T-wave alternans (TWA) in rabbits both in vivo and in vitro experimental preparations to evaluate whether certain periods in the animals' development exist that predispose to enhanced susceptibility to TWA. The in vivo part of their investigation consisted of longitudinal sessions of rapid transesophageal pacing of the atria at baseline, during β-adrenergic stimulation, and blockade, from 2 to 10 weeks of life, whereas the in vitro part comprised abrupt onset rapid endocardial pacing of neona... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=2370525 Tue, 28 Apr 2009 23:51:12 +0100 2370525