Characterization of Repolarization Alternans in the Coronary Artery Disease
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چکیده
منابع مشابه
Alternans of the ST segment in Prinzmetal's angina.
Alternans of the elevated ST segment (STEA) was found in 8 of 21 patients (38%) with Prinzmetal's variant angina. In addition to STEA, all eight patients had varying cardiac arrhythmias: multiple premature ventricular depolarizations in eight, ventricular tachycardia in five, and ventricular fibrillation in three. There was no consistent temporal relationship between the occurrence of STEA and ...
متن کاملA novel lead configuration for optimal spatio-temporal detection of intracardiac repolarization alternans.
BACKGROUND Electric alternans is a pattern of variation in the shape of ECG waveform that occurs every other beat. In humans, alternation in ventricular repolarization, known as repolarization alternans (RA), has been associated with increased vulnerability to ventricular tachycardia/fibrillation and sudden cardiac death. METHODS AND RESULTS This study investigates the spatio-temporal variabi...
متن کاملExperimental studies and clinical report on the electrical alternans of ST segment during myocardial ischemia.
During myocardial ischemia produced in 43 dogs by occlusion of left coronary artery, electrical alternans developed in 34 experiments. The most common was alternans of ST-T complex. Surface and intracellular electrograms were recorded simultaneously from contiguous sites in the ischemic area. The alternans of ST-T complex in the surface electrogram corresponded to that of the rate of repolariza...
متن کاملHigh-resolution electrical mapping of depolarization and repolarization alternans in an ischemic dog model.
Cardiac electrical alternans have been associated with spontaneous ventricular arrhythmias during myocardial ischemia. The study aims were to use a new algorithm to measure depolarization and repolarization alternans from epicardial electrograms in an ischemia model and to evaluate which features are predictive of ventricular fibrillation (VF). The left anterior descending coronary artery was o...
متن کاملSignificance of discordant ST alternans in ventricular fibrillation.
With the use of epicardial mapping, we investigated the electrical alternans of the ST segment during acute myocardial ischemia and studied the difference in ST alternans between dogs with resultant ventricular fibrillation and those without it. During the 7-minute occlusion of the left anterior descending coronary artery below its first diagonal branch, 60 epicardial unipolar electrograms were...
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