Role of maximum rate of depolarization in predicting action potential duration during ventricular fibrillation

Author:

Huang Jian,Cheng Kang-An,Dosdall Derek J.,Smith William M.,Ideker Raymond E.

Abstract

During ventricular fibrillation (VF) only 39% of the variation in action potential duration (APD) is accounted for by the previous diastolic interval [DI( n−1)], i.e., restitution, and the previous APD [APD( n−1)], i.e., memory. We tested the hypothesis that a characteristic of the AP upstroke, the maximum rate of depolarization ( V̇max), also helps account for its APD. A floating microelectrode was used to make transmembrane recordings at 16,000 samples/s from the anterior left ventricular wall during four 20-s episodes of VF in each of six pigs. V̇max, time from V̇max to 60% repolarization (APD60), and DI were calculated throughout all episodes. Stepwise linear regression was used to determine how well each APD60 (APD60 n) was predicted by V̇max of that AP, the four previous DIs ( n−1, n − 2, n − 3, n − 4), and the three previous APD60s ( n−1, n − 2, n − 3). V̇max entered in the regression equation significantly more often (86% of VF episodes) than either APD( n−1) (47% of episodes) or DI( n−1) (58% of episodes). When these three variables entered first or second, their coefficients were almost always positive, consistent with a longer APD associated with 1) a larger V̇max, 2) a longer APD( n−1), and 3) a longer DI( n−1). R2 of the regression for all entered variables was 0.51 ± 0.01 (mean ± SD). During the first 20 s of VF in swine, V̇max is a more important determinant of APD than the previous DI (restitution) or the previous APD (memory). All variables together account for only one-half of APD variation during VF.

Publisher

American Physiological Society

Subject

Physiology (medical),Cardiology and Cardiovascular Medicine,Physiology

Cited by 7 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Intracardiac Induced Ventricular Fibrillation for the Euthanasia of Sheep;Journal of the American Association for Laboratory Animal Science;2023-09-01

2. Detachable glass microelectrodes for recording action potentials in active moving organs;American Journal of Physiology-Heart and Circulatory Physiology;2017-06-01

3. Mechanism of reentry induction by a 9-V battery in rabbit ventricles;American Journal of Physiology-Heart and Circulatory Physiology;2014-04-01

4. Phase Relationship between Alternans of Early and Late Phases of Ventricular Action Potentials;Frontiers in Physiology;2012

5. Simultaneous optical mapping of transmembrane potential and wall motion in isolated, perfused whole hearts;Journal of Biomedical Optics;2011

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