早搏前后心室复极时间的变化

CHANGES OF CARDIAC REPOLARIZATION TIME FOLLOWING EXTRASYSTOLES

目的研究早搏对心室肌复极时间的影响。方法测定并比较不同类型早搏发生前后窦性激动的ＱＴ间期。结果早搏发生后的ＱＴ间期明显延长，但不同起源和不同心脏病之间无显著差异。

Objective To study the influence of extrasystoles on cardiac repolarization time. Methods The QT intervals of sinus excitation before and after extrasystole in 120 patients were measured and compared. Results The QT interval was significantly longer after extrasystole than before.This change in QT interval was not related to any part of the heart in which extrasystoles arose and to what kind of heart disease the patient had. Conclution The change of QT interval following extrasystoles is only determined by the length of the pause after the extrasystole, not consistent with what is predicted by Bazett's formula.