【摘要】 阈下条件单个刺激(S_s)和串刺激(S_t)可通过延长心脏受刺激局部的不应期,打断折返,终止快速性心律失常。本文使用心肌插入电极,观察了分别采用S_s法和S_t法测定的兔心室不应期强度间期关系特点及其关系,并观察了改变S_t的刺激参数特征对S_t引起的心室不应期变化的影响及S_s对心室有效不应期的影响。实验结果表明:低强度、高频、长持续时间的S_t能最大程度地延长心室不应期;具备以上刺激参数特征的S_t可能是用来终止折返性心动过速的最佳S_t。更多还原

【Abstract】 The effect of altering characteristic of stimulating parameter of subthre-shold train stimulation (St) on change of ventricular refractory period caused by St andeffect of subthreshold conditioning single stimulation on ventricular refractory periodwas observed in rabbits. The experimental findings indicate that Ss caused prolongationof ventricular effective refractory period, and that low-voltage, high-frequency, long-dura-tion St caused prolongation of maximal ventricular refractory period.更多还原