نتایج جستجو برای: repolarization
تعداد نتایج: 5285 فیلتر نتایج به سال:
The early repolarization syndrome, particular electrocardiographic aspect defined as J point and concave ST segment elevation, interpreted by electrophysiologists as benign for over five decades, caused over the past three years many controversies. The trigger for controversy were the results of several, mostly retrospective, studies concluding that individuals with early repolarization syndrom...
A large number of drugs can induce prolongation of cardiac repolarization and life-threatening cardiac arrhythmias. The prediction of this side effect is however challenging as it usually develops in some genetically predisposed individuals with normal cardiac repolarization at baseline. Here, we describe a platform based on a genetically diverse panel of induced pluripotent stem cells (iPSCs) ...
A non inactivating potassium current known as the delayed rectifier plays a major role in membrane repolarization during an action potential. Whereas several candidate genes exist that code for potassium current, the identities of the molecular isotypes that are responsible in situ for membrane repolarization remain unidentified. We report that Kv2 channels play a major role in action potential...
The ST-segment and adjacent T-wave (ST-T wave) amplitudes of the electrocardiogram are quantitative characteristics of cardiac repolarization. Repolarization abnormalities have been linked to ventricular arrhythmias and sudden cardiac death. We performed the first genome-wide association meta-analysis of ST-T-wave amplitudes in up to 37 977 individuals identifying 71 robust genotype-phenotype a...
Cardiac repolarization: insights from mathematical modeling and electrocardiographic imaging (ECGI).
Cardiac repolarization is a complex rate dependent process. At the cellular level, it depends on a delicate dynamic balance of ion channel currents. At the heart level, it is spatially heterogeneous, leading to spatial gradients of potential and excitability. This article provides insights into the molecular mechanisms of the delayed rectifiers I(Kr) (rapid) and I(Ks) (slow) that underlie effec...
To map global epicardial repolarization patterns and test the "SI" model of T wave generation, the patterns of epicardial activation and repolarization in patients with chronic pulmonary thromboembolism and right ventricular hypertrophy were studied by computerized mapping techniques and monophasic action potential (MAP) recording. The ventricular activation patterns were characterized by delay...
BACKGROUND External chest impacts (commotio cordis) can cause mechanically induced premature ventricular excitation (PVEM) and, rarely, ventricular fibrillation (VF). Because block of stretch-sensitive ATP-inactivated potassium channels curtailed VF occurrence in a porcine model of commotio cordis, VF has been suggested to arise from abnormal repolarization caused by stretch activation of potas...
BACKGROUND Repolarization abnormalities in the inferior-lateral leads in Brugada syndrome (BS) have not been systematically investigated. METHODS AND RESULTS 280 patients (age, 41+/-18 years; 168 males) with BS were screened for inferior-lateral repolarization abnormalities. The repolarization abnormalities were classified either as early repolarization pattern or coved > or = 2-mm Brugada pa...
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