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, 08 Feb 2012 09:32:47 +0100 http://www.medworm.com/index.php?rid=5559804&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611004791%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559804 Sun, 01 Jan 2012 05:00:00 +0100 5559804 http://www.medworm.com/index.php?rid=5559803&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100478X%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559803 Sun, 01 Jan 2012 05:00:00 +0100 5559803 http://www.medworm.com/index.php?rid=5559801&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611004493%2Fabstract%3Frss%3Dyes The article by Yu et al published ahead of print in the Journal on September 13, 2011, assessed the value of T-wave alternans (TWA) in predicting sudden cardiac death (SCD) in 227 consecutive patients 1 to 15 days after an acute myocardial infarction (AMI) using the modified moving average in 24-hour ambulatory electrocardiograms. The authors showed that TWA 47 μV or more predicted SCD or malignant ventricular arrhythmia, and its predictive value improved further when the frequency of TWA to 5 episodes or more, with this threshold, increased. What is unique about the study is that it focuses on the immediate period after an AMI in contrast to the bulk of relevant studies that have evaluated patients with chronic myocardial infarction leading to ischemic cardiomyopathy and the introduction... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559801 Thu, 10 Nov 2011 05:00:00 +0100 5559801 http://www.medworm.com/index.php?rid=5347371&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003748%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347371 Wed, 26 Oct 2011 08:41:35 +0100 5347371 http://www.medworm.com/index.php?rid=5347370&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003736%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347370 Wed, 26 Oct 2011 08:41:35 +0100 5347370 http://www.medworm.com/index.php?rid=5347358&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003700%2Fabstract%3Frss%3Dyes Certain nonantiarrhythmic drugs including antibiotics, psychotropic agents, and antiallergic agents are known to have a potential risk to induce a life-threatening arrhythmia, Torsade de pointes is caused by undesirable delay of ventricular repolarization. The drug-induced QT prolongation in electrocardiograms (ECGs) is, therefore, a matter of global concern in the regulation of new drug development. The International Conference of Harmonization of European Union, Japan, and United States published a technical guideline (E14) in 2005 for the clinical evaluation of QT prolongation by nonantiarrhythmic drugs. The purpose of this study was to establish the accurate automated QT measurement system for detecting the drug-induced QT interval prolongation. One hundred thirty-five ECGs were record... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347358 Wed, 26 Oct 2011 08:41:35 +0100 5347358 http://www.medworm.com/index.php?rid=5347357&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003694%2Fabstract%3Frss%3Dyes We previously demonstrated that local injury current (LIC), observed on the near-field (NF) right ventricular (RV) electrograms (EGMs), can occur after an implantable cardioverter-defibrillator (ICD) shock during defibrillation threshold testing. Local injury current, but not ICD shock, predicted subsequent pump failure death or hospitalization due to heart failure exacerbation. Acute LIC is a transient phenomenon, and whether LIC appears after appropriate and inappropriate ICD therapies is unknown. In this work, we systematically describe NF RV EGM morphology observed after appropriate and inappropriate ICD therapies, delivered due to spontaneous events, occurring at least 1 month after ICD implantation. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347357 Wed, 26 Oct 2011 08:41:35 +0100 5347357 http://www.medworm.com/index.php?rid=5347356&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003682%2Fabstract%3Frss%3Dyes A major impediment to an accurate diagnosis of a patient's electrocardiogram (ECG) by automatic defibrillators is the presence of noise at the point of contact between electrodes and patient. In some cases, this noise can be severe enough to cause a shock to be inaccurately advised. It is proposed to detect when too much noise is present through a consideration of the impedance cardiogram (Z). A detection of an overly noisy environment will prevent a shock diagnosis from occurring and eliminate the possibility of a shock being erroneously delivered to a patient. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347356 Wed, 26 Oct 2011 08:41:35 +0100 5347356 http://www.medworm.com/index.php?rid=5347355&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003670%2Fabstract%3Frss%3Dyes Repetitive monomorphic ventricular ectopy (RMVE) can induce electrical remodeling leading to cardiomyopathy that is completely reversible with successful catheter ablation. The aim of this study was to examine the relationship between repetitive monomorphic ventricular ectopy and repolarization abnormalities in patients with preserved left ventricular function and the role of catheter ablation in reversing these changes. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347355 Wed, 26 Oct 2011 08:41:35 +0100 5347355 http://www.medworm.com/index.php?rid=5347354&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003669%2Fabstract%3Frss%3Dyes Contemporary electrocardiogram (ECG) machines measure only leads I and II and calculate online the other 4 limb leads. Consequent to the above, lead aVR could be used as an index of all 6 limb leads, considering its mathematical relationship with leads I and II [aVR = −(I + II)/2]. This was shown recently using top-to-bottom amplitudes (Amps) of QRS complexes in a consecutive series of 100 ECGs (Pacing Clin Electrophysiol 2009;32:1567-76): aVR vs ∑I&II, r = 0.95, P = .00005; aVR vs ∑6limbleads, r = 0.81, P = .00005; and ∑I&II vs ∑6limbleads, r = 0.94, P = .00005. However the above-cited mathematical relationship of leads I, II, and aVR pertain to all instantaneous and simultaneous measurements of these 3 leads, which is not accurately reflected by their Amp. Thus, the “net QRS ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347354 Wed, 26 Oct 2011 08:41:35 +0100 5347354 http://www.medworm.com/index.php?rid=5347353&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003657%2Fabstract%3Frss%3Dyes Careful monitoring of the T wave and the QT interval is important to ensure the safety of antiarrhythmic drug administration. During atrial flutter (AFL), however, the application of QT–R-R analysis has been limited due to the superposition of atrial activity on the T wave. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347353 Wed, 26 Oct 2011 08:41:35 +0100 5347353 http://www.medworm.com/index.php?rid=5347352&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003645%2Fabstract%3Frss%3Dyes Gap junctions provide electrical communication of cardiac myocytes and enable coordinated action potential propagation in the heart. It is known that a variety of heart diseases are associated with uncoupling of myocardial gap junctions, which may contribute to structural substrates for reentrant ventricular tachyarrhythmias. There are some reports suggesting that calmodulin is involved in Ca2+-dependent gap junctional uncoupling. We investigated the effects of inhibition of calmodulin on intercellular electrical coupling and properties of excitation wave propagation in ventricular myocardium of isolated rabbit hearts. Western blot and immunoconfocal microscopy showed that treatment with 10 μM W-7, an inhibitor of calmodulin, enhanced localization of connexin 43 in the intercalated disk r... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347352 Wed, 26 Oct 2011 08:41:35 +0100 5347352 http://www.medworm.com/index.php?rid=5347351&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003633%2Fabstract%3Frss%3Dyes Derivation of a respiratory waveform from electrocardiographic (ECG) signals has been proposed for a number of applications including respiratory-gated diagnostic ECG, respiratory-gated imaging acquisition, and monitoring of sleep-disordered breathing. These methods can be used in systems that lack airway flow sensors or impedance-based respiration hardware components. We have previously developed a method for generating a waveform that corresponds to a person's respiratory effort using the electromyographic (EMG) signals superimposed on ECG waveforms (ECG/EMG-DR). Results have been good on healthy individuals, but it was unknown what effects respiratory disease that causes intrinsic positive end-expiratory pressure (PEEP), such as chronic obstructive pulmonary disease or asthma, would hav... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347351 Wed, 26 Oct 2011 08:41:35 +0100 5347351 http://www.medworm.com/index.php?rid=5347350&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003621%2Fabstract%3Frss%3Dyes In Brugada syndrome (BS), most of the ventricular arrhythmic events are nocturnal, suggesting an influence of the autonomic nervous system. High incidence of positive ventricular late potentials (LPs) has been reported in patients with BS. Furthermore, we have reported that the electrical abnormality in BS is not limited to the ventricular level; similar changes occur in the atria. There are few reports concerning circadian variation of LP in both atria and ventricle. We investigated whether BS associated with circadian variation of LP dynamics in both atria and ventricle in addition to the incidence of atrial and ventricular tachyarrhythmias. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347350 Wed, 26 Oct 2011 08:41:35 +0100 5347350 http://www.medworm.com/index.php?rid=5347349&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100361X%2Fabstract%3Frss%3Dyes This study investigates the relationship between the location of ischemic events and the associated effects on estimation accuracy for patient-specific leads derived from a limited lead system based on I, II, V2, and V5. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347349 Wed, 26 Oct 2011 08:41:35 +0100 5347349 http://www.medworm.com/index.php?rid=5347348&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003608%2Fabstract%3Frss%3Dyes Computerized algorithms have made significant improvements in the quality of monitoring care provided to hospitalized patients. Visual and auditory alarms alert clinical staff to changes in patient status; however, the false alarm rates remain high. It is unclear which physiologic monitor is the culprit source of most of the alarms, especially false alarms. Physiological monitoring alarms are necessary, but the high volume of total alarms leads to alarm fatigue, and the high false alarm rates lead to alarm apathy in clinical staff. Alarm fatigue is a recognized problem especially in critical care environments, and this has been implicated in negative patient outcomes and even death. The concept of alarm apathy is a direct result of the high rate of false alarms, where the alarms are incorr... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347348 Wed, 26 Oct 2011 08:41:35 +0100 5347348 http://www.medworm.com/index.php?rid=5347347&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003591%2Fabstract%3Frss%3Dyes The aim of the study was to find the optimum point on the P wave to deliver a shock to improve shock success and return of spontaneous circulation. An algorithm was developed using peak detection techniques to explore shock success at various points on the atrial electrocardiogram (ECG) during ventricular fibrillation (VF). (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347347 Wed, 26 Oct 2011 08:41:35 +0100 5347347 http://www.medworm.com/index.php?rid=5347346&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100358X%2Fabstract%3Frss%3Dyes This study is a retrospective study of the correlation between spectral morphology indicators derived from 12-lead resting ECG signals and conclusive diagnoses of perfusion imaging exercise–induced ischemia. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347346 Wed, 26 Oct 2011 08:41:35 +0100 5347346 http://www.medworm.com/index.php?rid=5347345&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003578%2Fabstract%3Frss%3Dyes Frequency-domain representation of the electrocardiogram (ECG) has largely been used for rhythm analysis, not its other major utility: quantification of shape. Because time and frequency domains are compensatory, quantification of recurring ECG morphology may be applied toward improving precision and robustness of shape interpretation. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347345 Wed, 26 Oct 2011 08:41:35 +0100 5347345 http://www.medworm.com/index.php?rid=5347344&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003566%2Fabstract%3Frss%3Dyes Identification and removal of redundant leads are a necessary step in reducing the amount of 12-lead electrocardiogram (ECG) data handled by emerging electronic data platforms, with applications in continuous monitoring, remote diagnosis, and so on. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347344 Wed, 26 Oct 2011 08:41:35 +0100 5347344 http://www.medworm.com/index.php?rid=5347343&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003554%2Fabstract%3Frss%3Dyes This study reports the validation performance. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347343 Wed, 26 Oct 2011 08:41:35 +0100 5347343 http://www.medworm.com/index.php?rid=5347342&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003542%2Fabstract%3Frss%3Dyes This study assessed the utility of the EMS as an educational tool. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347342 Wed, 26 Oct 2011 08:41:35 +0100 5347342 http://www.medworm.com/index.php?rid=5347341&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003530%2Fabstract%3Frss%3Dyes Myocardial ischemia is a pathological condition initiated by supply and demand imbalance of the blood to the heart. Electrocardiographic ST-segment shifts are often used as markers for ischemia. Literature suggests that the progression of ischemia occurs from the endocardium, which has the highest metabolic demand, and spreads toward the epicardium, eventually becoming transmural. Our study with animal models has found the progression of ischemia to be more complex and heterogeneous in its distribution. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347341 Wed, 26 Oct 2011 08:41:35 +0100 5347341 http://www.medworm.com/index.php?rid=5347340&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003529%2Fabstract%3Frss%3Dyes The International Conference on Harmonization E14 Guideline specifies detailed assessment of QT interval or corrected QT interval prolongation when developing new drugs. We recently devised a new software to precisely measure the QT interval. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347340 Wed, 26 Oct 2011 08:41:35 +0100 5347340 http://www.medworm.com/index.php?rid=5347339&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003517%2Fabstract%3Frss%3Dyes Some recent studies including ourselves and other researchers have shown that T-peak to T-end interval (TpTe) is correlated with the dispersion of heart repolarization, transmural, and/or apico-basal. However, how to calculate TpTe reliably in real-life electrocardiogram (ECG) is not a trivial problem. First, its definition; second, its detection for different T-wave morphologies. Because there are quite a few studies about T-end detection already, this study will focus on T-peak definition and calculations. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347339 Wed, 26 Oct 2011 08:41:35 +0100 5347339 http://www.medworm.com/index.php?rid=5347338&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003505%2Fabstract%3Frss%3Dyes The position of the heart within the thorax of a subject is relatively fixed. Its orientation, however, changes because of (deep) breathing and over time (aging). In young humans, the heart tends to be more vertical than in older people. The rotation of the heart, however, is not a simple upward rotation of the apex. In this model study, we investigate the influence of the rotation of the heart on the electrocardiogram. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347338 Wed, 26 Oct 2011 08:41:35 +0100 5347338 http://www.medworm.com/index.php?rid=5347337&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003499%2Fabstract%3Frss%3Dyes After the publication of a 3-phase time-sensitive model by Weisfeldt and Becker in 2002, research has focused on developing treatments specific to each of 3 phases of VF and means to establish its duration from the onset. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347337 Wed, 26 Oct 2011 08:41:35 +0100 5347337 http://www.medworm.com/index.php?rid=5347336&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003487%2Fabstract%3Frss%3Dyes Recently, the indication for ICD implantation is controversial in a patient with asymptomatic Brugada syndrome (asBrS) without family history. ICD therapy is effective for the prevention from sudden cardiac death due to Brugada syndrome. We performed the evaluation in autonomic nerve activity as heart rate variability, ventricular delayed potential as late potential, and RT dispersion (RTD) using a vector composition high-resolution mapping system, simultaneously. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347336 Wed, 26 Oct 2011 08:41:35 +0100 5347336 http://www.medworm.com/index.php?rid=5347335&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003475%2Fabstract%3Frss%3Dyes This study, therefore, suggests that single-beat manual measurements to annotate ECGs should not be used when an online editor incorporating 12 leads is superior. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347335 Wed, 26 Oct 2011 08:41:35 +0100 5347335 http://www.medworm.com/index.php?rid=5347334&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003463%2Fabstract%3Frss%3Dyes Recently, a short QT interval (QT) has been thought to be a risk factor of the fatal cardiac arrhythmia as well as a prolonged QT. To avoid unexpected sudden death caused by such arrhythmia that occurred during the phase 1 clinical trials for new drugs, it is important to set beforehand the lower limit of the QT reference value and exclude the inadequate candidates for the trials. However, there was no criterion to reasonably exclude individuals with the short QT from the candidates. The purpose of this study is to set the lower limit of QT reference value in rest electrocardiograms (ECGs) in healthy young Japanese men. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347334 Wed, 26 Oct 2011 08:41:35 +0100 5347334 http://www.medworm.com/index.php?rid=5347333&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003451%2Fabstract%3Frss%3Dyes In this study, we further investigate a 3-dimensional (3D) approach in the assessment of temporal beat-to-beat variability of cardiac signals in patients with structural heart disease in comparison with healthy subjects. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347333 Wed, 26 Oct 2011 08:41:35 +0100 5347333 http://www.medworm.com/index.php?rid=5347332&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100344X%2Fabstract%3Frss%3Dyes In this study, we illustrate that mirror leads that are identified by waveform similarity measures may be built up from components that are from different anatomical regions as their “nonmirror” counterparts. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347332 Wed, 26 Oct 2011 08:41:35 +0100 5347332 http://www.medworm.com/index.php?rid=5347331&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003438%2Fabstract%3Frss%3Dyes This study introduces a new algorithm for classifying occlusion location as proximal right, middle-distal right, or left circumflex (LCx) artery in inferior myocardial infarction. We compare the Philips automated algorithm to recently published culprit artery classification criteria. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347331 Wed, 26 Oct 2011 08:41:35 +0100 5347331 http://www.medworm.com/index.php?rid=5347330&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003426%2Fabstract%3Frss%3Dyes Cardiac monitors measure multiple physiologic parameters and audible alarms sound when algorithms detect changes in cardiac rhythm, ST segments, QT intervals, respiratory rate, SpO2, and other. “Alarm fatigue” occurs when staff are barraged by an excessive number of alarms that are false or do not require treatment. Numerous deaths have been reported because of alarm fatigue; either the alarm is ignored or, worse, alarm capabilities are disabled by the staff who find the noise bothersome. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347330 Wed, 26 Oct 2011 08:41:35 +0100 5347330 http://www.medworm.com/index.php?rid=5347329&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003414%2Fabstract%3Frss%3Dyes The objective of this study is to test the hypothesis that electrocardiographic (ECG) parameters measuring ventricular instability and repolarization heterogeneity could correlate with cardiac death when monitored during or after hemodialysis session (HS). (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347329 Wed, 26 Oct 2011 08:41:35 +0100 5347329 http://www.medworm.com/index.php?rid=5347328&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003402%2Fabstract%3Frss%3Dyes Risk stratification of patients with chest pain relies on identification of repolarization abnormalities. However, the initial electrocardiogram (ECG) of patients with suspected acute myocardial infarction is often normal or nondiagnostic. It has been shown that ischemia brings about depolarization changes that can be quantified by computerized analysis of high-frequency mid-QRS components (HFQRS). Morphological changes in HFQRS were shown to be a sensitive marker of ischemia in animal models and humans undergoing intracoronary balloon occlusions. We aimed to study the morphological patterns of HFQRS in patients with acute ST-elevation myocardial infarction (STEMI) before and after revascularization and to compare these patterns with healthy controls. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347328 Wed, 26 Oct 2011 08:41:35 +0100 5347328 http://www.medworm.com/index.php?rid=5347327&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003396%2Fabstract%3Frss%3Dyes Classical electrocardiographic (ECG) diagnosis of left ventricular hypertrophy (LVH) is based on voltage criteria, that is, increased amplitude of the QRS complex in particular leads. However, the spectrum of QRS complex patterns in patients with LVH is wider, and the increased QRS amplitude is only found in a minority of patients with increased left ventricular mass. In our previous study [1], we found decreased QRS complex amplitude associated with reduced connexin43 expression in the left ventricle in spontaneously hypertensive rats. Because this finding of decreased QRS complex amplitude was in contrast with the classical diagnostic concept, we studied the effect of reduced intercellular coupling on the resultant amplitude and morphology of the QRS complex of the surface ECG using a co... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347327 Wed, 26 Oct 2011 08:41:35 +0100 5347327 http://www.medworm.com/index.php?rid=5347326&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003384%2Fabstract%3Frss%3Dyes We examined QRS changes in patients with diabetes mellitus (DM) and metabolic syndrome (MetS), the first degree offspring of patients with DM and MetS, and compared them with a control group of healthy subjects. We hypothesized that electrocardiographic changes indicating electrical remodeling of myocardium are present already in apparently healthy offspring (HO) of patients with DM and MetS. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347326 Wed, 26 Oct 2011 08:41:35 +0100 5347326 http://www.medworm.com/index.php?rid=5347325&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003372%2Fabstract%3Frss%3Dyes This study aimed to longitudinally analyze in the fluctuations of late potential (LP) as a depolarization marker and T-wave variability (TWV) as a repolarization marker in patients with SAS. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347325 Wed, 26 Oct 2011 08:41:35 +0100 5347325 http://www.medworm.com/index.php?rid=5347324&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003360%2Fabstract%3Frss%3Dyes Acute myocardial infarction (AMI) is a major cause of death and disability. A rapid and reliable diagnosis is a major clinical need. The electrocardiogram and the measurement of myocardial enzymes are 2 important diagnostics methodologies, each having its strengths and drawbacks. We wanted to know if man or machine is better at detecting acute coronary syndrome (ACS) and AMI by hypothesizing that there is no statistically significant difference between man and machine, both blinded to clinical information after the patient's initial presentation at the emergency department. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347324 Wed, 26 Oct 2011 08:41:35 +0100 5347324 http://www.medworm.com/index.php?rid=5347323&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003311%2Fabstract%3Frss%3Dyes Abstract: Various clinical data demonstrate that cardiac resynchronization therapy (CRT) provides a favorable structural as well as electrical remodeling. The CArdiac Resynchronization–Heart Failure study, which tested the pure effect of CRT (using CRT devices without the capability of defibrillation) clearly showed a significant reduction in the total mortality by partly preventing sudden cardiac death. The antiarrhythmic effects of CRT are explained, at least in part, by ionic and genetic modulation of ventricular myocytes. It has been revealed in animal experiments to mimic disorganized ventricular contraction that CRT reverses down-regulation of certain K+ channels and abnormal Ca2+ homeostasis in the failing heart. However, CRT can be proarrhythmic in some particular cases especiall... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347323 Wed, 26 Oct 2011 08:41:35 +0100 5347323 http://www.medworm.com/index.php?rid=5347321&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002937%2Fabstract%3Frss%3Dyes Abstract: Electrical storm (ES), characterized by recurrent ventricular tachycardia/fibrillation, is a serious condition, adversely affecting prognosis in patients with implantable cardioverter/defibrillators. Electrical storm patients often die of progressive heart failure, but the underlying molecular basis is poorly understood. We have recently created an animal model of ES that features repetitive implantable cardioverter/defibrillator firing for recurrent ventricular fibrillation and found that ES events cause striking activation of Ca2+/calmodulin-dependent protein kinase II and prominent alteration of Ca2+-handling protein phosphorylation, possibly explaining mechanical dysfunction and arrhythmia promotion that characterize ES. Here, the pathophysiology and potential therapeutic str... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347321 Wed, 26 Oct 2011 08:41:35 +0100 5347321 http://www.medworm.com/index.php?rid=5347320&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003098%2Fabstract%3Frss%3Dyes Abstract: We evaluated electrocardiogram estimates of repolarization times (RTs) and action potential durations (APD) separately for initial and terminal repolarization periods in a reference group of 5376 healthy men and women and in 125 acute coronary syndrome patients with and 657 without diagnostic ST elevation (ST-elevation myocardial infarction [STEMI] and non-STEMI [NSTEMI], respectively). Two key covariates in the model are the rate-adjusted QT peak interval (QTpa), assigned to earliest epicardial RT (RTepi), and (Tp-Txd), the rate-invariant interval from Tp to the inflection point (Txd) at T wave downstroke. (Tp-Txd) defines the crossmural RT gradient (XMRTgrad). Transmural RTgrad (TMRTgrad) is obtained as CosΘ(Rmax|Tmax)*XMRTgrad, where Θ is the spatial angle between the maxima... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347320 Wed, 26 Oct 2011 08:41:35 +0100 5347320 http://www.medworm.com/index.php?rid=5347318&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003116%2Fabstract%3Frss%3Dyes In conclusion, our findings demonstrate that noninvasive ECG imaging based on just the 12-lead ECG might provide useful estimates of the regions of myocardial ischemia that agree with those provided by scintigraphic techniques. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347318 Wed, 26 Oct 2011 08:41:35 +0100 5347318 http://www.medworm.com/index.php?rid=5347315&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003104%2Fabstract%3Frss%3Dyes Conclusion: Low-tilt biphasic waveform was more efficacious for low-energy transvenous cardioversion of AF. A significant proportion of patients were successfully cardioverted to sinus rhythm with low energy. Radiofrequency-powered defibrillation can be safely used for transvenous cardioversion of AF. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347315 Wed, 26 Oct 2011 08:41:35 +0100 5347315 http://www.medworm.com/index.php?rid=5347305&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003025%2Fabstract%3Frss%3Dyes Abstract: The repolarizing Ta wave of normal sinus rhythm is not fully visible unless there is a long P-R interval or complete atrioventicular block. Even with the latter, it is often of unseeably low voltage. It can powerfully influence inferior lead ST deviation in the stress test. The Ta of inverted or retrograde P waves is of higher voltage than that of sinus rhythm and can simulate inferior injury. Evidence of specialized internodal tracts resides in 2 specific atrial action potential properties: resistance to gross hyperkalemia and supernormality. The Ta wave figures essentially in the diagnosis of acute atrial infarction. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347305 Wed, 26 Oct 2011 08:41:35 +0100 5347305 http://www.medworm.com/index.php?rid=5347303&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003256%2Fabstract%3Frss%3Dyes Conclusions: The good correlations illustrate that it is feasible to estimate the size of the left atrium from the P wave using wavelet techniques. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347303 Wed, 26 Oct 2011 08:41:35 +0100 5347303 http://www.medworm.com/index.php?rid=5559800&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003293%2Fabstract%3Frss%3Dyes Conclusions: Significant changes in autonomic control of heart rate that were a function of the affected artery occurred during and after coronary artery occlusions. Occlusion of the LAD resulted in a significant reduction of vagal activity and a decrease of the short-term fractal index during PCI and a marked sympathetic response after postdeflation. However, a marked increment of vagal activity between the occlusion stage and postdeflation period was found in the right coronary artery group. These results may relate the site of the occlusion and lack of blood supply to different parts of the left ventricle. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559800 Mon, 10 Oct 2011 04:00:00 +0100 5559800 http://www.medworm.com/index.php?rid=5559786&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003001%2Fabstract%3Frss%3Dyes Abstract: A 45-year-old man showed tombstone-like electrocardiographic change during stage 1 of stress testing, using Bruce protocol. The raw rhythm strip did not show any ST-T changes. These pseudochanges were probably the result of computer-synthesized averaging algorithm errors. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559786 Wed, 05 Oct 2011 04:00:00 +0100 5559786 http://www.medworm.com/index.php?rid=5347319&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002998%2Fabstract%3Frss%3Dyes Conclusion: Strong coherence between heart rate variability and intracardiac repolarization lability during biventricular pacing is associated with RER of the native conduction with CRT. Low coherence is associated with increased risk of VT/ventricular fibrillation or death. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347319 Mon, 26 Sep 2011 04:00:00 +0100 5347319 http://www.medworm.com/index.php?rid=5347304&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003128%2Fabstract%3Frss%3Dyes In this study, we used isolated rabbit right atria and mathematical model of the pacemaker region of the rabbit heart. Application of isoproterenol resulted in dose-dependent acceleration of the heart rate and superior shift of the leading pacemaker. In the mathematical model, such behavior could be reproduced by a gradient of expression in β1-adrenergic receptors along the superior-inferior axis. Application of acetylcholine resulted in preferentially inferior shift of pacemaker and slowing of the heart rate. The mathematical model reproduced this behavior with imposing a gradient of expression of acetylcholine-sensitive potassium channel. We conclude that anatomical shift of the leading pacemaker in the rabbit heart could be achieved through gradient of expression of β1-adrenergic rece... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347304 Wed, 21 Sep 2011 04:00:00 +0100 5347304 http://www.medworm.com/index.php?rid=5347306&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002986%2Fabstract%3Frss%3Dyes Abstract: Atrial fibrillation (AF), the most common sustained cardiac arrhythmia, represents a major health burden to individuals and health care system within the Western world. The lifetime risk for the development of AF at age 40 years has been estimated to be approximately 1 in 4. Atrial fibrillation is associated with substantial morbidity and a 2-fold increased risk of mortality. Given its increasing prevalence with age, coupled with the aging population, the number of Americans affected with AF is expected to increase from approximately 2.3 million in the year 2000 to nearly 16 million by 2050. This AF epidemic is further complicated by the lack of highly effective therapies. One reason for the lack of effective therapies for AF stems from incomplete understanding of the complex pat... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347306 Mon, 19 Sep 2011 04:00:00 +0100 5347306 http://www.medworm.com/index.php?rid=5559798&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003086%2Fabstract%3Frss%3Dyes Conclusion: Infrequent DRs during 24-hour Holter indicate high risk of postinfarction mortality. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559798 Fri, 16 Sep 2011 04:00:00 +0100 5559798 http://www.medworm.com/index.php?rid=5559796&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002536%2Fabstract%3Frss%3Dyes Conclusions: T-wave alternans (≥47 μV) monitored at 1 to 15 days after AMI-predicted heightened risk of SCD. Prediction is improved when the frequency of TWA episodes (≥47 μV) is analyzed. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559796 Fri, 16 Sep 2011 04:00:00 +0100 5559796 http://www.medworm.com/index.php?rid=5559791&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002524%2Fabstract%3Frss%3Dyes Conclusions: Antihypertensive treatment reduces the prevalence of hump and exercise ischemic-appearing ST depression probably through LV diastolic function improvement. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559791 Fri, 16 Sep 2011 04:00:00 +0100 5559791 http://www.medworm.com/index.php?rid=5347322&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003037%2Fabstract%3Frss%3Dyes Conclusions: This study documented prolongation of repolarization, increase in both epicardial and transmural repolarization gradients, and irregularity of transmural distribution in a rapid pacing canine model of heart failure compared with control animals. The findings support previously published results of increased repolarization heterogeneity and repolarization prolongation observed in rapid pacing models of heart failure. New findings are the irregularity of transmural heterogeneity and the ability of noninvasive root-mean-square electrocardiogram R-T intervals to estimate mean ventricular repolarization duration in the setting of rapid pacing models of heart failure. These findings suggest increased arrhythmogenic risk in this model and potentially in patients with heart failure. (... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347322 Fri, 16 Sep 2011 04:00:00 +0100 5347322 http://www.medworm.com/index.php?rid=5347314&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100286X%2Fabstract%3Frss%3Dyes Conclusions: Increased T wave CR24h can predict myocardial ischemia in asymptomatic middle-age adults; this suggests that the distorted T wave loop morphology can reflect an altered ventricular repolarization caused by prolonged subclinical myocardial ischemia possibly caused by early coronary artery disease. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347314 Fri, 16 Sep 2011 04:00:00 +0100 5347314 http://www.medworm.com/index.php?rid=5347313&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002883%2Fabstract%3Frss%3Dyes Conclusion: Among patients with ICDs, changes of Tamp after psychological stress were greater in those with subsequent arrhythmic events. This might signal proarrhythmic repolarization response and help identify patients who would benefit the most from ICD implantation and proactive management. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347313 Fri, 16 Sep 2011 04:00:00 +0100 5347313 http://www.medworm.com/index.php?rid=5347301&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002925%2Fabstract%3Frss%3Dyes This article reviews the advances made and the future direction of innovations in cardiac pacing. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347301 Fri, 16 Sep 2011 04:00:00 +0100 5347301 http://www.medworm.com/index.php?rid=5347316&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003013%2Fabstract%3Frss%3Dyes Abstract: Activation of cardiac sympathetic nerves alters ventricular repolarization; however, these changes remain poorly characterized. The goal of this study was to examine effects of sympathetic stimulation on repolarization to identify electrocardiographic markers of sympathetic activation. Pigs underwent median sternotomy and bilateral thoracotomy to expose the stellate ganglia. Changes in T-wave duration, amplitude, repolarization vector, and time from peak to end (Tp-Te) were continuously monitored. Within 15 seconds of unilateral left or right stellate ganglion (LSG/RSG) stimulation, T-wave amplitude increased 6- and 4.5-fold, respectively, in lead aVF. T-wave duration and Tp-Te both increased 200% during LSG stimulation but only 50% and 30%, respectively, with RSG stimulation. Du... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347316 Wed, 14 Sep 2011 04:00:00 +0100 5347316 http://www.medworm.com/index.php?rid=5347300&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002913%2Fabstract%3Frss%3Dyes Conclusion: Multiple myocardial infarctions modify the ECG because they eliminate Q waves and result in confusing, splintered QRS waveforms, referred to as M and W complexes. New criteria are presented to diagnose the presence and locations of these MMIs, which predict reduced left ventricular function, in normal sinus rhythm, left bundle-branch block, and ventricular pacing. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347300 Wed, 14 Sep 2011 04:00:00 +0100 5347300 http://www.medworm.com/index.php?rid=5559790&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002858%2Fabstract%3Frss%3Dyes We report a case of transient Himalayan P-waves of 9-mm amplitude associated with a severe emphysema exacerbation. Patient had a normal right atrial size. The giant P-waves were likely the result of severe pulmonary hyperinflation, right atrial hypoxia, and transient mechanical load on the right atrium directly resulting from the bronchospasm. Transient Himalayan P-waves of quite such amplitude have not been reported previously, which makes our case the first such report in literature. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559790 Mon, 12 Sep 2011 04:00:00 +0100 5559790 http://www.medworm.com/index.php?rid=5559785&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002500%2Fabstract%3Frss%3Dyes Conclusions: The use of individual torso geometry with the knowledge of the true heart position is very important for correct inverse results. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559785 Mon, 12 Sep 2011 04:00:00 +0100 5559785 http://www.medworm.com/index.php?rid=5347317&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003062%2Fabstract%3Frss%3Dyes Abstract: Methods for assessment of sleep-disordered breathing (SDB), including sleep apnea, range from a simple questionnaire to complex multichannel polysomnography. Inexpensive and efficient electrocardiogram (ECG)–based solutions could potentially fill the gap and provide a new SDB screening tool. In addition to the heart rate variability (HRV)–based SDB screening method that we reported a year ago, we have developed a novel method based on ECG-derived respiration (EDR). This method derives the respiratory waveform by (a) measuring peak-to-trough QRS amplitude in a single-channel ECG, (b) removing outlier introduced by noise and artifacts, (c) interpolating the derived values, and (d) filtering values within the respiration rates of 5 and 25 cycles per minute. Each 30 seconds of th... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347317 Mon, 12 Sep 2011 04:00:00 +0100 5347317 http://www.medworm.com/index.php?rid=5347312&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002950%2Fabstract%3Frss%3Dyes Abstract: Atrial fibrillation (AF) remains the most common arrhythmia encountered in clinical practice. Electrocardiogram (ECG)-based predictors of clinical outcome, however, have mostly been studied during sinus rhythm, whereas noninvasive risk stratification of patients with AF remains largely unexplored. Advances in ECG signal processing have led to the development of noninvasive methods of atrial fibrillatory rate (AFR) assessment using spatiotemporal QRST cancellation and time frequency analysis that demonstrated its predictive value for the outcome of pharmacologic and catheter-based interventions for AF. Recently, the prognostic value of AFR was evaluated in patients with congestive heart failure and indicated that reduced AFR may be an independent predictor of total and congestive ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347312 Mon, 12 Sep 2011 04:00:00 +0100 5347312 http://www.medworm.com/index.php?rid=5347311&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003050%2Fabstract%3Frss%3Dyes Conclusions: Heart rate turbulence is a powerful risk stratification index for cardiac events defined as cardiac mortality and sustained VTs in patients with NIDCM. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347311 Mon, 12 Sep 2011 04:00:00 +0100 5347311 http://www.medworm.com/index.php?rid=5347310&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611003049%2Fabstract%3Frss%3Dyes Abstract: We test the hypothesis that the degree of correlation between ventricular repolarization duration (VRD) and heart period (HP) carries information on cardiac autonomic regulation. The degree of correlation was assessed in the frequency domain using squared coherence function during an experimental protocol known to gradually induce a shift of sympathovagal balance toward sympathetic predominance (ie, graded head-up tilt). We observed a progressive decrease of squared coherence with tilt table inclination, thus confirming the working hypothesis. The VRD-HP uncoupling occurs in the high-frequency band, centered on the respiratory rate, thus suggesting that vagal withdrawal is responsible for the VRD-HP uncoupling. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347310 Mon, 12 Sep 2011 04:00:00 +0100 5347310 http://www.medworm.com/index.php?rid=5347309&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002974%2Fabstract%3Frss%3Dyes Abstract: The J wave, a deflection that follows the QRS complex of the surface electrocardiogram, is usually partially buried in the R wave in humans, appearing as a J-point elevation. An early repolarization (ER) pattern characterized by J-point elevation, slurring of the terminal part of the QRS, and ST-segment elevation has long been recognized and considered to be totally benign. Recent studies have presented evidence demonstrating that an ER pattern in inferior leads or inferolateral leads is associated with increased risk for life-threatening arrhythmias, named early repolarization syndrome. Early repolarization syndrome and Brugada syndrome share similar electrocardiographic characteristics, clinical outcomes, risk factors, as well as a common arrhythmic platform related to amplific... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347309 Mon, 12 Sep 2011 04:00:00 +0100 5347309 http://www.medworm.com/index.php?rid=5347307&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002949%2Fabstract%3Frss%3Dyes Abstract: One of the most important and challenging aspects of caring for patients with congenital long QT syndrome (LQTS) is assessing an individual's risk of sudden cardiac death (SCD) because of torsades de pointes. Current risk assessment integrates clinical and genetic features known to be associated with SCD, but more accurate methods of risk assessment could lead to more appropriate use of therapies, potentially saving lives and avoiding overtreatment. Conventional indices of risk include sex, age, extent of QT prolongation, history of symptoms (syncope or aborted SCD), and genetic subtype. The biophysical properties of specific mutations (eg, those that affect transmembrane segments of the ion channel protein or those that cause a dominant negative effect on ion channel function vs... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347307 Mon, 12 Sep 2011 04:00:00 +0100 5347307 http://www.medworm.com/index.php?rid=5347302&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002871%2Fabstract%3Frss%3Dyes This article will focus on a few of the pitfalls to be avoided when interpreting paced ECGs. Pacemaker algorithms designed to minimize right ventricular pacing may be confused with pathologic failure to output. Automatic capture threshold detection schemes may be misinterpreted as failure to capture as well as undersensing due to the extra “backup” pacemaker spikes noted on rhythm strips. Device testing done in the emergency department may produce waveforms on monitor resembling ventricular tachycardia if pacemaker-mediated tachycardia is produced accidentally. Ventricular safety pacing algorithms may also be misinterpreted as failure to sense appropriately, triggering questions about pacemaker malfunction. Certain types of true undersensing may resemble morphologies consistent with pa... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347302 Mon, 12 Sep 2011 04:00:00 +0100 5347302 http://www.medworm.com/index.php?rid=5347308&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002962%2Fabstract%3Frss%3Dyes Abstract: Catecholaminergic polymorphic ventricular tachycardia (CPVT) is an inherited arrhythmia syndrome characterized by VT induced by adrenergic stress in the absence of structural heart disease and high incidence of sudden cardiac death. The diagnosis is made based on reproducible ventricular tachyarrhythmias including bidirectional VT and polymorphic VT during exercise testings. Two causative genes of CPVT have been identified: RYR2, encoding the cardiac ryanodine receptor (RyR2) Ca2+ release channel, and CASQ2, encoding cardiac calsequestrin. A mutation in RYR2 or CASQ2 is identified in approximately 60% of patients with CPVT. Mutations in these two genes destabilize the RyR2 Ca2+ release channel complex in sarcoplasmic reticulum and result in spontaneous Ca2+ release through RyR2 c... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347308 Mon, 29 Aug 2011 04:00:00 +0100 5347308 http://www.medworm.com/index.php?rid=5161528&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002421%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161528 Sat, 27 Aug 2011 13:39:31 +0100 5161528 http://www.medworm.com/index.php?rid=5161527&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100241X%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161527 Sat, 27 Aug 2011 13:39:31 +0100 5161527 http://www.medworm.com/index.php?rid=5161526&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002238%2Fabstract%3Frss%3Dyes Conclusions: Repolarization changes are present in patients with heart failure, although less pronounced compared with after right ventricular pacing in structurally normal hearts. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161526 Sat, 27 Aug 2011 13:39:31 +0100 5161526 http://www.medworm.com/index.php?rid=5161525&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002275%2Fabstract%3Frss%3Dyes Conclusions: Modeling the activation of the LV based on papillary muscle position alone may be overly simplistic. Better understanding of what other factors contribute to individual variation in LV activation will help develop a more useful theoretical model. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161525 Sat, 27 Aug 2011 13:39:30 +0100 5161525 http://www.medworm.com/index.php?rid=5161521&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002330%2Fabstract%3Frss%3Dyes Conclusion: Worst lead residual ST deviation 30 minutes after reperfusion allows accurate identification of patients at high risk for LV dysfunction, which was mainly related to IS rather than transmurality or microvascular obstruction. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161521 Sat, 27 Aug 2011 13:39:30 +0100 5161521 http://www.medworm.com/index.php?rid=5161520&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002287%2Fabstract%3Frss%3Dyes Conclusions: In this study of patients with reperfused MI, patients with inferior locations demonstrated a statistically significant relationship between the amount of positivity of T wave amplitude and both IS and LVEF measured at 3 months. Furthermore, these results were independent of whether the T wave positivity was persistent or evolutionary between the immediate postreperfusion and 3-month ECG recordings. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161520 Sat, 27 Aug 2011 13:39:30 +0100 5161520 http://www.medworm.com/index.php?rid=5161519&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002251%2Fabstract%3Frss%3Dyes This article provides detailed instructions and examples on how to apply the QRS score criteria in the presence of confounding conduction types to facilitate understanding and enable development and application of automated QRS scoring. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161519 Sat, 27 Aug 2011 13:39:29 +0100 5161519 http://www.medworm.com/index.php?rid=5161518&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100224X%2Fabstract%3Frss%3Dyes Conclusions: Manual quantification of MI size by CMR can differ significantly from semiautomated, validated methods taking partial volume effects into account and can lead to erroneous conclusions when compared with ECG. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161518 Sat, 27 Aug 2011 13:39:29 +0100 5161518 http://www.medworm.com/index.php?rid=5161514&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002342%2Fabstract%3Frss%3Dyes Along with the development of electronic transmission of digital, prehospital electrocardiograms (ECGs), patients with acute myocardial infarction meeting the ST-elevation myocardial infarction (STEMI) criteria can now rapidly be triaged and sent directly to a regional percutaneous coronary intervention (PCI) center for primary PCI (pPCI). In addition to conventional ST evaluation, ECG-based triage and risk stratification can be improved by also considering depolarization changes as a measure of the severity of ischemia, thereby making it possible to further individualize prehospital patient management. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161514 Sat, 27 Aug 2011 13:39:29 +0100 5161514 http://www.medworm.com/index.php?rid=5161513&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002354%2Fabstract%3Frss%3Dyes Conclusion: Grade 3 ischemia was associated with high-risk patient criteria (older age, diabetes, TIMI risk score >3, Killip class >1, and anterior myocardial infarction) and represents a subgroup of high-risk patients who seems to be associated with poor myocardial reperfusion and worse outcome. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161513 Sat, 27 Aug 2011 13:39:29 +0100 5161513 http://www.medworm.com/index.php?rid=5161512&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002299%2Fabstract%3Frss%3Dyes Conclusion: The initial ST-segment depression in leads V1, V2, and −V6 can predict ECG-estimated amount of infarction in the posterolateral left ventricular wall in patients with acute inferior myocardial infarction receiving reperfusion therapy, but only in those who present early in the ischemia/infarction process. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161512 Sat, 27 Aug 2011 13:39:29 +0100 5161512 http://www.medworm.com/index.php?rid=5161511&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002263%2Fabstract%3Frss%3Dyes In conclusion, a wide variation of reperfusion decisions was observed among clinical cardiologists, and their decisions were not altered by adding ST deviation measurements in numeric and/or graphic displays. Acute coronary occlusion detection rate was low for ECGs meeting STEMI criteria, and this was improved by adding ST-segment measurements in numeric and graphic forms. These results merit further study of the clinical value of this technique for improved acute coronary occlusion treatment decision support. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161511 Sat, 27 Aug 2011 13:39:28 +0100 5161511 http://www.medworm.com/index.php?rid=5161508&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002196%2Fabstract%3Frss%3Dyes Abstract: It is well accepted that early reperfusion is beneficial in patients with acute myocardial infarction presenting with ST elevation (STE). Earlier studies suggested lack of beneficial effects in patients presenting without STE and even with ST depression. Currently, time to reperfusion is considered to be a quality of care measure, and the latest American College of Cardiology/American Heart Association guidelines for the treatment of STE acute myocardial infarction (STEMI) emphasize that the physician at the emergency department should make reperfusion decisions within 10 minutes of performing the initial electrocardiogram (ECG). However, not all ECGs with STE necessarily reflect transmural infarction from acute thrombotic occlusion of an epicardial coronary artery, as a large nu... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161508 Sat, 27 Aug 2011 13:39:28 +0100 5161508 http://www.medworm.com/index.php?rid=5161507&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002366%2Fabstract%3Frss%3Dyes The Magnetic and eLectrical Technologies (MALT) meeting is a round-table conference primarily focusing not only on the correlation of electrocardiography and cardiac magnetic resonance imaging (MRI) but also other imaging modalities. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161507 Sat, 27 Aug 2011 13:39:28 +0100 5161507 http://www.medworm.com/index.php?rid=5559784&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002329%2Fabstract%3Frss%3Dyes Abstract: Limb lead connection errors are known to be very common in clinical practice.The consequences of all possible single limb lead interconnection errors were analyzed in an earlier publication (J Electrocardiology 2008;41:84-90). With a single limb lead interconnection error, 6 combinations of limb lead connections are possible. Two of these combinations give rise to records in which the limb lead morphology is uninterpretable. Such records show a “flat line” in lead II or III. Three of the errors give rise to records that are fully interpretable once the specific interconnection error has been identified (although one of the errors cannot reliably be recognized in the absence of a previous record for comparison). One of the errors produces no change in the electrocardiogram rec... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559784 Thu, 25 Aug 2011 04:00:00 +0100 5559784 http://www.medworm.com/index.php?rid=5559799&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002378%2Fabstract%3Frss%3Dyes Conclusion: The results might question the concept of a linear relationship between the SBP changes and RRI changes. The phase-rectified signal averaging–based assessment of BRS may be used with equal legitimacy in the nonnormalized and normalized forms; the normalized form provides results in conventional measurement units. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559799 Mon, 22 Aug 2011 04:00:00 +0100 5559799 http://www.medworm.com/index.php?rid=5559789&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002317%2Fabstract%3Frss%3Dyes For decades, early repolarization characterized by elevation of the junction between the end of the QRS complex and the beginning of the ST segment (the J point) has been considered to be a normal electrocardiographic (ECG) variant. The presence of a prominent J wave, however, especially in the inferior leads, is increasingly recognized as a marker of risk for malignant cardiac arrhythmias and cardiac death. The electrophysiologic mechanism and clinical significance of J-point elevation are hotly debated. The prevailing and almost uncontested theory is that J-point elevation is a genetic and purely electrophysiologic abnormality characterized by early repolarization of certain segments of the myocardium, giving rise to prominent voltage gradients between the endocardium and the epicardium ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559789 Mon, 22 Aug 2011 04:00:00 +0100 5559789 http://www.medworm.com/index.php?rid=5559788&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001622%2Fabstract%3Frss%3Dyes Conclusion: The rhythm diagnoses of automated systems did not reach better average accuracy than those of nonexpert readings. The computer diagnosis of rhythm can be incorrect in cases where the clinicians fail in reaching the correct ECG diagnosis. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559788 Thu, 04 Aug 2011 04:00:00 +0100 5559788 http://www.medworm.com/index.php?rid=5559797&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002202%2Fabstract%3Frss%3Dyes In conclusion, the association between PR and HR is age- and rate-dependent and a separate rate-adjustment formula is needed for adults in younger and older age groups. The prognostic significance of the rate-adjusted PR needs to be investigated. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559797 Mon, 25 Jul 2011 04:00:00 +0100 5559797 http://www.medworm.com/index.php?rid=5161523&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002214%2Fabstract%3Frss%3Dyes Conclusions: Low QRS voltage does not necessarily contradict a diagnosis of LVH but may be an indication for electrical uncoupling. The diagnostic value of this “relative voltage deficit” needs to be demonstrated in clinical studies. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161523 Thu, 14 Jul 2011 23:00:00 +0100 5161523 http://www.medworm.com/index.php?rid=5161522&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002226%2Fabstract%3Frss%3Dyes Abstract: The Working Group on Electrocardiographic Diagnosis of Left Ventricular Hypertrophy, appointed by the Editor of the Journal of Electrocardiology, presents the alternative conceptual model for the ECG diagnosis of left ventricular hypertrophy (LVH). It is stressed that ECG is a record of electrical events, not of mechanical events and/ or anatomical characteristics. Considering the electrical characteristics of pathologically changed myocardium should lead to better understanding and improved clinical usefulness of the ECH in the clinical diagnosis of LVH. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161522 Thu, 14 Jul 2011 23:00:00 +0100 5161522 http://www.medworm.com/index.php?rid=5161516&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002123%2Fabstract%3Frss%3Dyes We present 3 cases of patients with predominantly grade 1 ischemia, in whom the culprit site was in the left anterior descending coronary artery. The electro/pathophysiologic mechanisms of these electrocardiographic patterns are discussed. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161516 Thu, 14 Jul 2011 23:00:00 +0100 5161516 http://www.medworm.com/index.php?rid=5161524&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001610%2Fabstract%3Frss%3Dyes Abstract: This contribution demonstrates some applications of the most recent release of ECGSIM, an interactive simulation program that enables the user to study the relationship between the electric current sources of the heart and the resulting electrocardiographic signals on the body surface as well as those on the surface of the heart. It aims to serve as an educational tool as well as a research tool. The examples are drawn from the topics discussed by the participants of the Magnetic Anatomic and eLectrical Technology meeting in Maastricht, the Netherlands (February 2011), reports of which are to be found in the current issue of the Journal of Electrocardiology. These examples include simulation of the atrial electrocardiogram, improved accessibility of endocardial source locations, ... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161524 Sun, 10 Jul 2011 23:00:00 +0100 5161524 http://www.medworm.com/index.php?rid=4970261&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100166X%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970261 Mon, 27 Jun 2011 17:17:40 +0100 4970261 http://www.medworm.com/index.php?rid=4970260&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001658%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970260 Mon, 27 Jun 2011 17:17:40 +0100 4970260 http://www.medworm.com/index.php?rid=4970259&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001348%2Fabstract%3Frss%3Dyes Alzand and Gorgels studied whether there are electrocardiographic characteristics that may help in differentiating between acute ST-segment elevation myocardial infarction (STEMI) due to proximal right coronary artery (RCA) occlusion and distal left anterior descending (LAD) coronary occlusion among patients presenting with ST elevation in both the precordial and inferior leads. The authors retrospectively compared the electrocardiograms (ECGs) of 7 patients with acute RCA infarction to those of 5 patients with distal LAD occlusion. Overall, the analysis is interesting; however, unfortunately the number of patients in each group is very small. Moreover, 1 of the 7 patients with RCA infarction did not have ST elevation in the inferior leads (patient 1c). (Source: Journal of Electrocardiolog... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970259 Mon, 27 Jun 2011 17:17:40 +0100 4970259 http://www.medworm.com/index.php?rid=4970256&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001312%2Fabstract%3Frss%3Dyes Conclusion: Prolongation of electromechanical delay and increased Pd are associated with apnea-hypopnea index (AHI) and hence the severity of disease. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970256 Mon, 27 Jun 2011 17:17:40 +0100 4970256 http://www.medworm.com/index.php?rid=4970255&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001543%2Fabstract%3Frss%3Dyes Conclusion: The beat-to-beat repolarization variability was measured with high fidelity with the deltaT50 method and was a robust measure in healthy volunteers. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970255 Mon, 27 Jun 2011 17:17:39 +0100 4970255 http://www.medworm.com/index.php?rid=4970249&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001592%2Fabstract%3Frss%3Dyes Discussion and conclusion: Spatial ventricular gradient hysteresis bears predictive potential for arrhythmias in heart failure patients with an ICD for primary prevention, whereas TWA analysis seems to have lesser predictive value in our pilot group. Spatial ventricular gradient hysteresis is relatively robust for noise, and, as it rests on different electrophysiologic properties than TWA, it may convey additional information. Hence, joint analysis of TWA and SVGH may, possibly, improve the noninvasive identification of high-risk patients. Further research, in a large group of patients, is required and currently carried out by our group. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970249 Mon, 27 Jun 2011 17:17:38 +0100 4970249 http://www.medworm.com/index.php?rid=4970247&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001245%2Fabstract%3Frss%3Dyes Conclusion: The EMS has the potential to be used to support researchers in enhancing criteria currently used for detecting electrode misplacement. It could also be used to assist academic staff in teaching the effects of electrode misplacement. In this respect, it is currently being used as part of an undergraduate “Clinical Physiology” degree program at the University of Ulster. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970247 Mon, 27 Jun 2011 17:17:38 +0100 4970247 http://www.medworm.com/index.php?rid=4970245&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001324%2Fabstract%3Frss%3Dyes Conclusion: Leads placed on a horizontal strip, in line with leads V1 and V2, provided the optimal placement for the diagnosis of anterior and lateral STEMI and appear superior to leads V3, V4, V5, and V6. This is of significant clinical interest, not only for ease and replication of lead placement but also may lead to increased recruitment of patients eligible for revascularization with none or borderline ST-segment elevation on the initial 12-lead ECG. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970245 Mon, 27 Jun 2011 17:17:38 +0100 4970245 http://www.medworm.com/index.php?rid=4970244&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611002081%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970244 Mon, 27 Jun 2011 17:17:38 +0100 4970244 http://www.medworm.com/index.php?rid=4970241&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001518%2Fabstract%3Frss%3Dyes Conclusion: If there is no specific reason to use the inverse Dower matrix, VCG synthesis from standard 12-lead ECGs should preferably be done by using the Kors matrix. It is likely to assume that already published studies in which the predictive value of SA-Dower was demonstrated would yield stronger results if the SA-Dower angles were substituted by SA-Kors angles. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970241 Mon, 27 Jun 2011 17:17:37 +0100 4970241 http://www.medworm.com/index.php?rid=4970239&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001361%2Fabstract%3Frss%3Dyes The ST-segment deviation is recognized as a sign of myocardial ischemia; in patients with acute coronary syndrome, its characteristics are used to determine the presence of acute coronary occlusion; to estimate the extent and location of area at risk, the severity of ischemia, and the acuteness of the ischemia/infarction process; and to assess the thrombolytic treatment. Because the ST-segment deviation can have a spectrum of possible causes, it is obvious that the interpretation should be made in the context of the clinical history and other findings. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970239 Mon, 27 Jun 2011 17:17:37 +0100 4970239 http://www.medworm.com/index.php?rid=5559793&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001555%2Fabstract%3Frss%3Dyes Conclusion: The increase in the duration of the QRS complex and the appearance of new electrocardiographic alterations may help in identifying patients with a significant decrease (of 5% or more) in left ventricle ejection fraction. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559793 Mon, 27 Jun 2011 04:00:00 +0100 5559793 http://www.medworm.com/index.php?rid=5559792&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001427%2Fabstract%3Frss%3Dyes Abstract: We determined the prevalence of J waves in the electrocardiograms (ECG) of 120 patients with Wolff-Parkinson-White syndrome in comparison with J-wave prevalence in a control group of 1936 men and women with comparable demographic and ECG characteristics and with normal atrioventricular conduction. J waves were present only during manifest preexcitation in 22 of 120 patients (18.3%), disappearing after catheter ablation and suggesting that J waves were associated with the presence of preexcitation. J waves were present in 19 (15.8%) of 120 patients only after ablation, apparently having been masked by early depolarization of the preexcited myocardial region, and in 22 patients (18.3%), J waves were not altered significantly by preexcitation. Thus, the overall J-wave prevalence was... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559792 Mon, 27 Jun 2011 04:00:00 +0100 5559792 http://www.medworm.com/index.php?rid=5559795&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001567%2Fabstract%3Frss%3Dyes A 59-year-old woman with a history of severe nonischemic dilated cardiomyopathy with left bundle-branch block, status post implantation of a biventricular pacemaker-cardioverter-defibrillator (BiV/ICD) 3 years before, presented with atypical chest pain. She denied any recent physical or emotional stress. The patient had 2 cardiac catheterizations in the past without demonstrable coronary artery disease. After implantation of the BiV/ICD, her heart failure symptoms have essentially resolved, and her left ventricular ejection fraction has increased from 30% to 50%. On presentation, the patient's vital signs were normal, and her cardiovascular examination result was negative. Chest x-ray revealed trivial cardiomegaly and clear lung fields; the pacemaker and ICD leads were in the appropriate p... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559795 Wed, 22 Jun 2011 04:00:00 +0100 5559795 http://www.medworm.com/index.php?rid=5559794&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001531%2Fabstract%3Frss%3Dyes Conclusion: The EOR follows the activation sequence both on the epicardium and endocardium. The apico-basal gradients are predominant repolarization gradients, as compared with the epicardial–endocardial gradients. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559794 Wed, 22 Jun 2011 04:00:00 +0100 5559794 http://www.medworm.com/index.php?rid=5161510&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001580%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161510 Tue, 21 Jun 2011 23:00:00 +0100 5161510 http://www.medworm.com/index.php?rid=5161509&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001415%2Fabstract%3Frss%3Dyes Conclusions: Left coronary artery dominance, multivessel disease, and absence of ECG signs of proximal culprit lesion are associated with failure to predict the culprit artery of inferior myocardial infarction by the 12-lead ECG. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161509 Tue, 21 Jun 2011 23:00:00 +0100 5161509 http://www.medworm.com/index.php?rid=5559802&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100135X%2Fabstract%3Frss%3Dyes The report by Demidova et al and the accompanying editorial by Terkelsen, in the January/February issue of the Journal of Electrocardiology, focuses on the “reperfusion peak” (RP), that is, the transient additional ST-elevation (STE) detected in both the porcine model after restoration of coronary flow, and patients with an STE myocardial infarction, undergoing primary percutaneous coronary intervention. The realization of the phenomenon of paradoxical increase in STE after reperfusion is not new. It has been described in several articles as occurring during intravenous thrombolytic therapy. At first, it was thought to represent a good sign of reperfusion. Later, the concept has been changed suggesting that the RP represents some form of “reperfusion injury.” Although it is far fro... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5559802 Fri, 10 Jun 2011 04:00:00 +0100 5559802 http://www.medworm.com/index.php?rid=5347369&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001336%2Fabstract%3Frss%3Dyes We would like to point out how recent observations about the origin of artifacts in the electrocardiogram (ECG) may be able to solve the questions surrounding a “bizarre electrocardiogram” published in 2005 by Özhan et al. They presented a patient with “bizarre, big T waves” in all ECG leads except lead II and only in a single ECG ( from the article shown). The authors speculated that the changes might be associated with a specific pattern of abnormal left ventricular motion. A closer look at the ECG reveals some features, which are typical for an artifact originating from the left arm electrode. The artifact is in bipolar extremity leads only seen in leads involving the left arm (leads I and III), and the amplitude of the artifact is identical in leads I, III, and aVL, whereas t... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347369 Thu, 09 Jun 2011 04:00:00 +0100 5347369 http://www.medworm.com/index.php?rid=5347361&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001257%2Fabstract%3Frss%3Dyes Conclusion: The elucidation of the participation of working myocardium impairment in the intraventricular conduction delay in the LV could be of vital significance for the clinical management of patients with LBBB patterns, for example, indicated for resynchronization therapy. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347361 Thu, 09 Jun 2011 04:00:00 +0100 5347361 http://www.medworm.com/index.php?rid=5161515&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611001269%2Fabstract%3Frss%3Dyes Conclusions: There is a moderate correlation between AW-acuteness score and salvageable myocardium in patients with acute RCA occlusion but not in patients with LAD occlusion. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161515 Wed, 08 Jun 2011 23:00:00 +0100 5161515 http://www.medworm.com/index.php?rid=4970246&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000902%2Fabstract%3Frss%3Dyes Conclusion: In patients with acute ischemic-type chest pain who have a normal cTnT at presentation, the combination of H-FABP and BSPM at first assessment identifies those with early AMI (c-statistic, 0.812; P < .001), thus allowing earlier triage to reperfusion therapy and secondary prevention. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970246 Sun, 01 May 2011 23:00:00 +0100 4970246 http://www.medworm.com/index.php?rid=5347368&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000914%2Fabstract%3Frss%3Dyes Abstract: Torsades de pointes (TdP) is a fatal polymorphic ventricular tachyarrhythmia that is related to QTc prolongation. Takotsubo cardiomyopathy (TCM) is characterized by acute transient left ventricular dysfunction without obstructive coronary artery disease. The QTc interval is always prolonged in TCM; however, TdP is rarely reported in patients with TCM. Despite that the electrocardiograms of patients with TCM unexceptionally demonstrate marked QTc interval prolongation, TdP is rarely associated with TCM, leading to the proposal that TCM is another cause of acquired long QT syndrome and another insult to the repolarization reserve. We identified 2 cases that reinforce this concept. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347368 Fri, 29 Apr 2011 04:00:00 +0100 5347368 http://www.medworm.com/index.php?rid=4970258&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000926%2Fabstract%3Frss%3Dyes The article by Nemati et al, published ahead of print in the journal on December 14, 2010, pertained to T wave alternans (TWA) during sleep analyses over the range of 40 to 110 beats per minute (bpm) heart rates in healthy subjects and patients with heart failure, sudden cardiac death, and obstructive sleep apnea (OSA) and implemented 4 public domain databases and 1 patient series generated by the authors. Exploration of the impact of heart rate, the state of OSA, and the clinical conditions mentioned above on the magnitude of TWA, as assessed by 2 techniques, led to the confirmation of the influence of heart rate, occurrence of TWA in healthy subjects, as shown recently, and some counterintuitive observations, that is, the rise of the TWA below the rate of 60 bpm (both in healthy subjects... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970258 Thu, 28 Apr 2011 23:00:00 +0100 4970258 http://www.medworm.com/index.php?rid=4970243&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100094X%2Fabstract%3Frss%3Dyes Conclusions: The downward slope between R and S waves correlates with ischemia and could have potential value in risk stratification in acute ischemia in addition to ST-T analysis. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970243 Thu, 28 Apr 2011 23:00:00 +0100 4970243 http://www.medworm.com/index.php?rid=4735987&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000987%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735987 Fri, 22 Apr 2011 15:18:47 +0100 4735987 http://www.medworm.com/index.php?rid=4735986&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000975%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735986 Fri, 22 Apr 2011 15:18:47 +0100 4735986 http://www.medworm.com/index.php?rid=4735979&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000872%2Fabstract%3Frss%3Dyes Abstract: Seven cases are reported of acute right coronary artery occlusion and predominantly right ventricular myocardial infarction with typical ST-segment elevation in the precordial leads resembling acute anterior wall myocardial infarction. These electrocardiograms were compared with those of 5 unselected patients who had combined inferior and anterior ST-segment elevation due to a distal occlusion of the left anterior descending artery. In this manuscript, the electrocardiographic features of both conditions are briefly discussed. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735979 Fri, 22 Apr 2011 15:18:45 +0100 4735979 http://www.medworm.com/index.php?rid=4735977&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000057%2Fabstract%3Frss%3Dyes Conclusion: The ECG estimated total MaR was more accurate by taking both ST deviation and QRS abnormalities into account than by using either method alone. A new ECG method to determine the total MaR during acute coronary occlusion should consider both its ischemic and infarcted components. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735977 Fri, 22 Apr 2011 15:18:45 +0100 4735977 http://www.medworm.com/index.php?rid=4735966&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610005674%2Fabstract%3Frss%3Dyes Abstract: Action potential duration (APD) changes increasing repolarization time (RT) dispersion are potentially arrhythmogenic. A repolarization model developed from electrocardiographic data of 5376 healthy men and women was used to derive parameter estimates for APD and RT and their transmural gradients (RTgrad and APDgrad, respectively) in myocardial infarction patients, 126 with and 658 without diagnostic ST elevation (STEMI and NSTEMI, respectively). The model uses, as covariates, rate-adjusted QT and QT peak intervals (QTa and QTpa, respectively) and diagonal crossmural RTgrad derived as Tp-Txd, the interval from Tp to the inflection point at descending limb of global T wave. An additional parameter is Θ(T|Tref), the spatial angle between a subject's T vector and the average T vect... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735966 Fri, 22 Apr 2011 15:18:43 +0100 4735966 http://www.medworm.com/index.php?rid=4735964&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000938%2Fabstract%3Frss%3Dyes Conclusions: The findings challenge the concept that prolongation of TpTe corresponds to higher risk of death from any cause in every population. Further investigations are needed to confirm that clinically measured TpTe reflects transmural repolarization heterogeneity in all clinical populations and indeed is a useful risk marker. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735964 Fri, 22 Apr 2011 15:18:43 +0100 4735964 http://www.medworm.com/index.php?rid=4735963&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000896%2Fabstract%3Frss%3Dyes Characterization of physiologic processes involved in ventricular repolarization and the diagnosis of repolarization abnormalities are significant tasks faced by contemporary electrocardiology. The repolarization processes are perhaps reasonably understood at the level of isolated myocytes. A multitude of ion channels have been identified, including their genetic coding, which is responsible for transmembrane currents active during different phases of the action potentials of individual myocytes. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735963 Fri, 22 Apr 2011 15:18:43 +0100 4735963 http://www.medworm.com/index.php?rid=4970252&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610001147%2Fabstract%3Frss%3Dyes Abstract: A 45-year-old woman with severe chest deformity and great vessel tortuosity successfully underwent left accessory pathway ablation of atrioventricular reentrant tachycardia via right transradial arterial access. Transradial catheter ablation of left accessory pathway was safe and efficacious without complications. When transfemoral or transseptal access was impossible, transradial access was a good alternative route. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970252 Tue, 12 Apr 2011 23:00:00 +0100 4970252 http://www.medworm.com/index.php?rid=5347367&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000884%2Fabstract%3Frss%3Dyes Conclusion: In refractory patients, proximal ablation of the posterior fascicle might be indicated. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347367 Thu, 31 Mar 2011 04:00:00 +0100 5347367 http://www.medworm.com/index.php?rid=5347359&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100077X%2Fabstract%3Frss%3Dyes Conclusions: Transtelephonic electrocardiography combined with awareness of the risk factors of patients presenting with chest pain is useful for the diagnostic management of these patients in health care facilities without the means to interpret electrocardiograms. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347359 Thu, 31 Mar 2011 04:00:00 +0100 5347359 http://www.medworm.com/index.php?rid=5161517&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007843%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5161517 Wed, 30 Mar 2011 23:00:00 +0100 5161517 http://www.medworm.com/index.php?rid=4970248&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361100080X%2Fabstract%3Frss%3Dyes In this study, the influence of the time-varying mean heart rate (HR) and respiratory frequency in the ability of HR variability (HRV) indices to diagnose coronary artery disease has been studied. The autonomic nervous system activity has been assessed using a methodology that comprises correction of the HRV signal by the time-varying mean HR and redefinition of the classical high-frequency band to include respiratory frequencies above 0.4 Hz. The obtained clinical indices discriminate patients with coronary artery disease from patients with Framingham risk index lower than 5% with a moderate accuracy of 76%, which is lower than the reported in literature for HRV indices. We claim that time-varying mean HR and respiratory frequency, if not taken into account, introduce apparent improvement... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970248 Wed, 30 Mar 2011 23:00:00 +0100 4970248 http://www.medworm.com/index.php?rid=5347364&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000689%2Fabstract%3Frss%3Dyes We report a case of a patient with idiopathic left ventricular tachycardia (VT) successfully ablated from the epicardial aspect of the left ventricle, after a previous failed endocardial ablation. The VT appeared to be catecholamine sensitive. An excellent epicardial pacemap was found in the midlateral region of the left ventricle, remote from vascular structures. Following ablation, the patient discontinued antiarrhythmic drug use and has not experienced any recurrence of VT for more than 2 1/2 years. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347364 Mon, 21 Mar 2011 04:00:00 +0100 5347364 http://www.medworm.com/index.php?rid=5347363&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000781%2Fabstract%3Frss%3Dyes Conclusions: Invasive treatment was rarely required in patients with VT without HD. The prognosis was only dependent on the age and the pattern of electrocardiogram in VT. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=5347363 Mon, 21 Mar 2011 04:00:00 +0100 5347363 http://www.medworm.com/index.php?rid=4970250&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000793%2Fabstract%3Frss%3Dyes Conclusion: The new algorithm is suitable for automated preanalysis of the ECG data with regard to AF. It could be used for rapid selection of ECGs with relevant rhythm abnormalities from a large pool. Electrocardiographic data remain to be evaluated by health care professionals for exact diagnosis. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970250 Mon, 21 Mar 2011 00:00:00 +0100 4970250 http://www.medworm.com/index.php?rid=4735971&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361000628X%2Fabstract%3Frss%3Dyes Conclusions: Asymptomatic individuals with spontaneous or drug-induced type 1 ECG phenotype of BS display a benign clinical course during long-term follow-up. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735971 Mon, 21 Mar 2011 00:00:00 +0100 4735971 http://www.medworm.com/index.php?rid=4970253&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610006230%2Fabstract%3Frss%3Dyes Abstract: Inhalational oleander toxicity was considered in a family of 4 by history of exposure to smoke from burning oleander twigs. Electrocardiography revealed first- and second-degree atrioventricular block with digoxin-like ST–T-wave changes, suggestive of oleander toxicity in the absence of exposure to digoxin or other herbal medicines, and without systemic illness. Complete blood count, biometabolic profile, chest x-ray, and echocardiography did not reveal any abnormalities. Electrocardiographies normalized within 4 days when kept away from offending agents. Because oleander plant materials are used for burning, people are exposed to inhalational oleander toxicity. Hence, practitioners shall consider such poisonings in them. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4970253 Mon, 14 Mar 2011 00:00:00 +0100 4970253 http://www.medworm.com/index.php?rid=4735982&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000690%2Fabstract%3Frss%3Dyes The comprehensive article by Vales et al in the January/February 2011 issue of the Journal reports on painstaking analysis of the performance (sensitivity and specificity) of the electrocardiogram (ECG) prediction of the culprit artery in acute inferior ST-segment elevation myocardial infarction (IMI) of the authors' algorithm against that of the ones proposed by Fiol et al and Tierala et al. They concluded that using merely as a criterion the presence or absence of ≥1.0-mm ST-segment depression in lead aVR differentiates the right from the left circumflex as the culprit coronary artery in IMI with a sensitivity and specificity somewhat lower than the latter 2 algorithms, with the advantage that their algorithm uses only lead aVR, whereas the other 2 methods use multiple ECG leads in suc... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735982 Mon, 14 Mar 2011 00:00:00 +0100 4735982 http://www.medworm.com/index.php?rid=4735983&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007818%2Fabstract%3Frss%3Dyes Conclusions: Changes of the QRS amplitudes in ECGs are as useful for monitoring HF patients as BNP. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4735983 Fri, 04 Mar 2011 00:00:00 +0100 4735983 http://www.medworm.com/index.php?rid=4594666&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000215%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594666 Tue, 01 Mar 2011 00:00:00 +0100 4594666 http://www.medworm.com/index.php?rid=4594665&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073611000203%2Fabstract%3Frss%3Dyes (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594665 Tue, 01 Mar 2011 00:00:00 +0100 4594665 http://www.medworm.com/index.php?rid=4594662&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007867%2Fabstract%3Frss%3Dyes Initial studies to select patients for cardiac resynchronization therapy (CRT) used prolonged QRS duration as the principal inclusion criteria. However, QRS duration is not a great predictor of response and benefit from CRT is greatest in patients with left bundle branch block (LBBB)., This makes sense because multiple pathologies can prolong QRS duration, but only complete LBBB results in a significant (ie, ≥60 milliseconds) delay between activation of the septum and left ventricular (LV) free wall. Because the goal of CRT is to resynchronize activation of these 2 walls, if there is not a significant baseline delay, then CRT should not help. Recent efforts have focused on improving patient response to CRT by better selecting patients before CRT implantation and optimizing CRT after impl... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594662 Tue, 01 Mar 2011 00:00:00 +0100 4594662 http://www.medworm.com/index.php?rid=4594658&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610003936%2Fabstract%3Frss%3Dyes Conclusion: Our results revealed that interatrial electromechanical delay and Pd were prolonged in patients with hypertension. Our results also showed a correlation between interatrial electromechanical delay and Pd. Prolonged electromechanical delay and Pd found in hypertensive patients could be related with increased incidence of atrial fibrillation in these patients. Prospective studies are needed to document the association between intraatrial and interatrial electromechanical delays and the development of atrial fibrillation. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594658 Tue, 01 Mar 2011 00:00:00 +0100 4594658 http://www.medworm.com/index.php?rid=4594647&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007806%2Fabstract%3Frss%3Dyes Risk stratification of acute myocardial ischemia could be improved by adding depolarization changes to the conventionally used ST-T changes. No QRS method has, however, reached clinical use yet .We assessed the value of analyzing QRS slope changes to evaluate and quantify ischemia. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594647 Tue, 01 Mar 2011 00:00:00 +0100 4594647 http://www.medworm.com/index.php?rid=4594646&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS002207361000779X%2Fabstract%3Frss%3Dyes The value of sequential T-wave changes on the electrocardiogram (ECG) has less well been described in the follow-up of myocardial infarction. We sought to investigate whether T-wave amplitude correlates with infarct size (IS) and left ventricular ejection fraction (LVEF) measured using cardiac magnetic resonance imaging (CMR) 3 months after reperfusion therapy. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594646 Tue, 01 Mar 2011 00:00:00 +0100 4594646 http://www.medworm.com/index.php?rid=4594645&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007788%2Fabstract%3Frss%3Dyes We introduce an extensible open-source software toolkit for forward and inverse problems in electrocardiography within the framework of the SCIRun package from the Center for Integrative Biomedical Computing. There is a dearth of such tools for the forward and inverse electrocardiogram (ECG) problems. By contrast, there are a number of well-known and frequently used software packages, both academic and commercial, for solving forward and inverse problems in brain source localization using electroencephalographic and magnetoencephalographic measurements. The availability of such packages has greatly aided progress in this field by facilitating validation and fair comparison of algorithms and enhancing the scientific acceptance of new algorithms through increasing reproducibility of results.... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594645 Tue, 01 Mar 2011 00:00:00 +0100 4594645 http://www.medworm.com/index.php?rid=4594644&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007776%2Fabstract%3Frss%3Dyes We describe a unique cause of fetal bradycardia where fetal “echo” beats were diagnosed by inference supporting a bradycardia, which should be self-limited, requiring no treatment. In 2 fetuses, bradycardia with a heart rate of 70 to 90 beats/min was noted in association with a history of intermittent fetal supraventricular tachycardia. Careful echocardiographic evaluation of the heart rhythm revealed retrograde pulmonary blood flow in a bigeminal fashion in association with nonconducted atrial extrasystoles. The diagnosis of blocked “echo” beats was contemplated. This diagnosis should be considered when intermittent fetal tachycardia and bradycardia coexist, supporting coupled atrial extrasystoles causing bigeminal sinus node suppression, resulting in relative bradycardia. The bra... Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594644 Tue, 01 Mar 2011 00:00:00 +0100 4594644 http://www.medworm.com/index.php?rid=4594643&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007764%2Fabstract%3Frss%3Dyes Various 12-lead electrocardiogram (ECG) criteria have been established to detect right ventricular hypertrophy as a marker of pulmonary hypertension (PH). Although some criteria offer good specificity, they lack sensitivity because of a low prevalence of positive findings in the PH population. We hypothesized that 3-dimensional equivalent dipole (ED) model could serve as a better detection tool of PH. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594643 Tue, 01 Mar 2011 00:00:00 +0100 4594643 http://www.medworm.com/index.php?rid=4594642&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007752%2Fabstract%3Frss%3Dyes We have enforced the simple heart examination with a pocket size event electrocardiogram (ECG) on that day of the marathon rally, for predicting heart problem. The examination corner was installed in the starting point of 5 big marathon rallies in Japan, and lead I of the ECG in CG-2100 pocket size event ECG corresponding was recorded for 32 seconds for 2596 applicant total people (1558 men and 1038 women: ten 80 years old). The ECG specialist made out the ECG later and classified it according to the severity of ECG findings. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594642 Tue, 01 Mar 2011 00:00:00 +0100 4594642 http://www.medworm.com/index.php?rid=4594641&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007740%2Fabstract%3Frss%3Dyes Recently, body surface potentials measured on patients with coronary artery disease were used for testing the method for identification of local ischemic lesions by an inverse solution with 2 dipoles. A standard torso model with main inhomogeneities and 154 predefined positions of dipoles was used. The 15 different realistic individual models of torso were used to evaluate their influence on the result of the inverse identification. (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594641 Tue, 01 Mar 2011 00:00:00 +0100 4594641 http://www.medworm.com/index.php?rid=4594640&cid=s_38506_7_f&fid=38506&url=http%3A%2F%2Fwww.jecgonline.com%2Farticle%2FPIIS0022073610007739%2Fabstract%3Frss%3Dyes Analysis of high-frequency QRS components (HFQRS) were recently reported to improve the diagnostic accuracy of electrocardiogram (ECG) treadmill test (ETT). We sought to evaluate the clinical usefulness of HFQRS analysis during exercise echocardiography (echoCG) in detecting ischemic heart disease (IHD). (Source: Journal of Electrocardiology) Journal of Electrocardiology journals http://www.medworm.com/rss/comments.php?id=4594640 Tue, 01 Mar 2011 00:00:00 +0100 4594640