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ContentsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Journal of Electrocardiology)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Tags: Frontmatter Source Type: journals

Editorial BoardEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Journal of Electrocardiology)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Tags: Frontmatter Source Type: journals

Acknowledgment of JELC 2009 Guest ReviewersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Journal of Electrocardiology)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Tags: Acknowledgment of JELC 2009 Guest Reviewers Source Type: journals

Current morphologic and vectorial aspects of P-wave analysisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Polychronis Dilaveris, Christodoulos Stefanadis Tags: Erratum Source Type: journals

Articles Appearing in the Next IssueEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: Journal of Electrocardiology)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Tags: Clinical Diagnosis Source Type: journals

Investigation of QRS duration changes caused by right ventricular pacing by computer simulation based on a whole-heart modelEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 incor...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Noriko Yasuda, Osamu Okazaki, Xin Zhu, Daming Wei Tags: Poster Session 1 and 2 Source Type: journals

Arrhythmias in patients with acute coronary syndromes in the first 24 hours of emergency department admission during the postreperfusion eraEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Catherine Winkler, Marjorie Funk, Barbara Drew, Dan Schindler, Jessica Zègre-Hemsey, John O'Leary Tags: Poster Session 1 and 2 Source Type: journals

Detection of myocardial ischemia by enhanced American College of Cardiology/European Society of Cardiology ST-segment-elevation acute myocardial infarction criteriaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: J.J. Wang, G.S. Wagner, T.N. Martin, J.W. Warren, B.M. Horáček Tags: Poster Session 1 and 2 Source Type: journals

Human overread of semiautomated QT measurements may adversely affect final results in cardiac safety studiesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 ...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Branislav Vajdić, Ihor Gussak, Boško Bojović, Samuel George Tags: Poster Session 1 and 2 Source Type: journals

Ventricular preexcitation mimicking dilated cardiomyopathy: the location of the accessory pathway is predictive of this associationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Floris Udink ten Cate Tags: Poster Session 1 and 2 Source Type: journals

Cardiac restitution and electrocardiographic stress testingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 validatio...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: C.P. Danford, V. Varadarajan, A.J. Starobin, V.N. Polotski, J.M. Starobin Tags: Poster Session 1 and 2 Source Type: journals

A practical protocol to address barriers and slow acceptance for use of continuous ischemia monitoring in US hospitalsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 respondin...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Kristin E. Sandau, Maureen Smith Tags: Poster Session 1 and 2 Source Type: journals

Fundamental frequency and regularity of cardiac electrograms with Fourier organization analysisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Óscar Barquero-Pérez, José Luis Rojo-Álvarez, Rebeca Goya-Esteban, Felipe Alonso-Atienza, J.J. Sánchez-Muñoz, Jesús Requena-Carrión, Arcadi García-Alberola Tags: Poster Session 1 and 2 Source Type: journals

Evaluation of computer algorithm performance in culprit artery identification—comparison with expert readers' analysis in acute myocardial infarctionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Kjell Nikus, Sophia Zhou, Richard Gregg, Ronald Startt-Selvester, Yochai Birnbaum Tags: Poster Session 1 and 2 Source Type: journals

Noninvasive computerized acoustic cardiographic prediction of pulmonary hypertensionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Andrew D. Michaels, Shadi Karabsheh, Renée M. Neuharth, Syed Masood, Patti Arand Tags: Poster Session 1 and 2 Source Type: journals

Intravenous electrocardiographic guidance for placement of peripherally inserted central cathetersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 cathet...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Andrew D. Michaels, Renée M. Neuharth, Mary Ann Hendrix, Daniel McDonnall, Scott Hiatt Tags: Poster Session 1 and 2 Source Type: journals

Modern pacemaker stimuli as viewed from a 12-lead electrocardiogramEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 develop...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: S. Luo, W. Hong, P. Johnston, P. Macfarlane Tags: Poster Session 1 and 2 Source Type: journals

Biopotential fiber sensors have equivalent in vivo electric performance to standard Ag-AgCl wet electrodesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: S. Lobodzinski, U. Teppner, M. Laks Tags: Poster Session 1 and 2 Source Type: journals

P-terminal force changes with ischemia induced by percutaneous coronary interventionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Eunyoung Lee, Andrew D. Michaels, Ronald H. Selvester, Barbara J. Drew Tags: Poster Session 1 and 2 Source Type: journals

Development of a program for repolarization parameters of research and clinical interest using the Matlab platformEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 fo...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Dongchul C. Lee, Jaeyeon Kim, Morrison Hodges Tags: Poster Session 1 and 2 Source Type: journals

The electrocardiogram vector basis for location of the bypass tracts in Wolf-Parkinson-WhiteEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: M.M. Laks Tags: Poster Session 1 and 2 Source Type: journals

Evaluation of a new modified chest lead in diagnosing wide-complex beats of unknown originEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Mark A. Kossick, Neal Kay, Michael Carter, James Pruett, Linda Hill Tags: Poster Session 1 and 2 Source Type: journals

Simulation of the QRS complex using papillary muscles positions as the site of early activation: first QRS simulation in human subjectsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 compl...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Nina Hakacova, Geoffrey D. Bass, Charles W. Olson, Anna M.C. Robinson, Ronald Selvester, Galen S. Wagner Tags: Poster Session 1 and 2 Source Type: journals

Automated performance analysis of short-vector versus long-vector electrocardiogramsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 ana...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Dirk Q. Feild, Stacy Gehman Tags: Poster Session 1 and 2 Source Type: journals

Performance of an ST-dipole vector model for description of ST deviations in occlusive myocardial ischemiaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: M.P. Andersen, C.J. Terkelsen, J.T. Sørensen, J.J. Struijk Tags: Poster Session 1 and 2 Source Type: journals

T-wave morphology in long-QT syndromeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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: Jour...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Esben Vedel-Larsen, Christian Haarmark, Claus Graff, Mads P. Andersen, Egon Toft, Johannes J. Struijk, Jorgen Kanters Tags: Poster Session 1 and 2 Source Type: journals

Design and validation of a pacing-spike removal algorithm for paced frequency domain analysisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Sami Torbey, Damian P. Redfearn, Selim Aki Tags: Poster Session 1 and 2 Source Type: journals

Detection of ST-T abnormalities by portable electrocardiogram monitoring devices—comparison with standard 12-lead electrocardiogramEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Yuji Kasamaki, Masakatsu Ohta, Toshiko Nakai, Ichiro Watanabe, Atsushi Hirayama, Yukio Ozawa, Midori Masuno Tags: Poster Session 1 and 2 Source Type: journals

Efficacy of low level laser therapy around the stellate ganglion in the treatment of sick sinus syndromeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Yuji Kasamaki, Masakatsu Ohta, Toshiko Nakai, Ichiro Watanabe, Atsushi Hirayama, Yukio Ozawa, Kenichi Yoshida, Masamai Ichiba, Kouji Kagami Tags: Poster Session 1 and 2 Source Type: journals

ST-segment depression in aVr as a predictor of culprit artery and infarct size in acute inferior wall ST-segment elevation myocardial infarctionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Yumiko Kanei, Jyoti Sharma, Ravi Diwan, Ron Sklash, Lori L. Vales, John T. Fox, Paul Schweitzer Tags: Poster Session 1 and 2 Source Type: journals

A mobilized 12-lead electrocardiogram information system for clinical emergency telemedicineEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Jui-chien Hsieh Tags: Poster Session 1 and 2 Source Type: journals

Considerations for clinical studies for electrocardiographsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 pl...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Charles Ho, Lynn Braddock, Benjamin Eloff, Brian Lewis, Nina Nwaba, Linda Ricci, Estelle Russek-Cohen, Elias Mallis Tags: Poster Session 1 and 2 Source Type: journals

Displaying computerized electrocardiogram recordings on smartphonesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 e...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: T. Hilbel, S. Klug, R.L. Lux, H.A. Katus Tags: Poster Session 1 and 2 Source Type: journals

Detection of periodic variations including T-wave AlternansEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Eric D. Helfenbein, A. Dean Forbes, James M. Lindauer, Saeed Babaeizadeh, Sophia H. Zhou Tags: Poster Session 1 and 2 Source Type: journals

Automated age- and gender-specific Selvester scoring system for electrocardiogram-estimated myocardial infarct sizeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Richard E. Gregg, Sophia H. Zhou, Ronald Startt/Selvester, Bohumil Milan Horáček, Galen S. Wagner Tags: Poster Session 1 and 2 Source Type: journals

Moxifloxacin-induced changes in T-wave morphologyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: C. Graff, J. Matz, M.P. Andersen, J.K. Kanters, E. Toft, J. Xue, J.J. Struijk Tags: Poster Session 1 and 2 Source Type: journals

New universal definition of myocardial infarction improves the electrocardiogram diagnosis of acute coronary syndromeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 cardiolog...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Kirsten E. Fleischmann, Jessica Zegre-Hemsey, Barbara J. Drew Tags: Poster Session 1 and 2 Source Type: journals

The effect of electrode misplacement in the reconstruction of the 12-lead electrocardiogram from EASI leadsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: D.D. Finlay, S.P. Nelwan, C.D. Nugent, M.P. Donnelly Tags: Poster Session 1 and 2 Source Type: journals

The use of impedance cardiography in automatic external defibrillators to discriminate between shockable and nonshockable ventricular tachycardia in real timeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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 - October 24, 2009 Category: Cardiology Authors: R. Di Maio, C. Navarro, N.A. Cromie, J.M.C. Anderson, A.A.J. Adgey Tags: Poster Session 1 and 2 Source Type: journals

Computer versus manual calculations of the spatial QRS-T angleEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Mary G. Carey, Salah S. Al-Zaiti Tags: Poster Session 1 and 2 Source Type: journals

End of T-wave determination by polynomial curve fitting on a vector magnitude leadEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Boško Bojović, Ljupčo Hadžievski, Ihor Gussak, Samuel George, Branislav Vajdić Tags: Poster Session 1 and 2 Source Type: journals

Influence of altered conductivity on the QRS complex patternEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Ljuba Bacharova, Vavrinec Szathmary Tags: Poster Session 1 and 2 Source Type: journals

Philips Microvolt Electrocardiogram Amplitude Periodicity algorithm for detection and quantification of T-wave alternansEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Saeed Babaeizadeh, Eric D. Helfenbein, Jim M. Lindauer, Sophia H. Zhou Tags: Poster Session 1 and 2 Source Type: journals

Manual and automatic measurements of moxifloxacin-induced QT prolongationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: M.P. Andersen, J. Matz, C. Graff, J.K. Kanters, E. Toft, J.J. Struijk Tags: Poster Session 1 and 2 Source Type: journals

Negative correlation relationship between left ventricular hypertrophy Sokolow-Lyon and body mass in 41 806 Swiss conscriptsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Roger Abächerli, Richard Kobza, Bernhard Niggli, Lingchuan Zhou, Johann-Jakob Schmid, Franz Frey, Paul Erne Tags: Poster Session 1 and 2 Source Type: journals

Risk prediction by heart rate turbulence and deceleration capacity in postinfarction patients with preserved left ventricular function retrospective analysis of 4 independent trialsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Axel Bauer, Petra Barthel, Alexander Müller, Kurt Ulm, Heikki Huikuri, Marek Malik, Georg Schmidt Tags: Session VII: Heart Rate Dynamics, Turbulence, Deceleration Capacity - Co-Chairs: Georg Schmidt/Dirk Field Source Type: journals

New material for implantable cardiac leadsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: S. Suave Lobodzinski, Michael Laks Tags: Session V: Solutions for Cleaner ECG Data: Leads, Filtering - Co-Chairs: Suave Lobodzinski/Michael Laks Source Type: journals

From ST-elevation myocardial infarction to ST elevation with no myocardial infarction—review and overview of a new horizon of computerized electrocardiographic ischemia detection using high-fidelity implantable devicesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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, a...
Source: Journal of Electrocardiology - October 24, 2009 Category: Cardiology Authors: Mitchell W. Krucoff Tags: Session I: Very Early Detection of STEMI with Surface and Implantable ECG - Co-Chairs: Mitch Krucoff/Linda Ricci Source Type: journals

Interpretation of electrocardiograms by first-year residents: the need for changeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - September 8, 2009 Category: Cardiology Authors: Dayana Eslava, Sandeep Dhillon, Jeffrey Berger, Peter Homel, Steven Bergmann Tags: Education Source Type: journals

Right ventricular apical lead position is associated with prolonged signal-averaged P-wave durationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
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)
Source: Journal of Electrocardiology - September 6, 2009 Category: Cardiology Authors: Mark A. Maraschiello, Damian P. Redfearn, Adrian M. Baranchuk, Christopher S. Simpson Tags: Session IV: Jos Willems Young Investigators Competition - Co-Chairs: Konrad Brockmeier/Eric Helfenbein Source Type: journals