Refractoriness prolongation by defibrillation shocks.
نویسندگان
چکیده
منابع مشابه
Prolongation of repolarization time by electric field stimulation with monophasic and biphasic shocks in open-chest dogs.
Recent studies suggest that 1) electrically induced fibrillation and defibrillation involve prolongation of refractoriness by the shock in addition to stimulation and 2) biphasic waveforms are more efficient for defibrillation than are comparable monophasic waveforms. The purpose of this study was to compare prolongation of action potential duration at 50% repolarization by monophasic and bipha...
متن کاملSynchronized repolarization after defibrillation shocks. A possible component of the defibrillation process demonstrated by optical recordings in rabbit heart.
BACKGROUND It is currently believed that defibrillation shocks act primarily by stimulating excitable myocardium to abolish wave fronts. Recent studies have shown that shocks applied during pacing not only stimulate excitable myocardium but also prolong the depolarization and refractoriness of myocardium already in a depolarized state. This study investigates the effects of shocks on fibrillati...
متن کاملProlong the Duration of Depolarization and the Refractory Period
The present data were obtained using the technique of optical recording with the voltagesensitive dye WW781. This technique, unlike electrical methods, was able to provide uninterrupted recordings free of artifacts during defibrillation shocks. Optical recordings were made from sites on the ventricular epicardium of perfused rabbit hearts during electrical pacing. Continuous recordings of the e...
متن کاملA Possible Component of the Defibrillation Process Demonstrated by Optical Recordings in Rabbit Heart
Background. It is currently believed that defibrillation shocks act primarily by stimulating excitable myocardium to abolish wave fronts. Recent studies have shown that shocks applied during pacing not only stimulate excitable myocardium but also prolong the depolarization and refractoriness of myocardium already in a depolarized state. This study investigates the effects of shocks on fibrillat...
متن کاملOptical recordings in the rabbit heart show that defibrillation strength shocks prolong the duration of depolarization and the refractory period.
The present data were obtained using the technique of optical recording with the voltage-sensitive dye WW781. This technique, unlike electrical methods, was able to provide uninterrupted recordings free of artifacts during defibrillation shocks. Optical recordings were made from sites on the ventricular epicardium of perfused rabbit hearts during electrical pacing. Continuous recordings of the ...
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عنوان ژورنال:
- Circulation
دوره 82 3 شماره
صفحات -
تاریخ انتشار 1990