本文观察了家兔在急性心肌缺血及再灌流后室颤阈(VFT)的变化和刺激迷走神经对VFT的影响。结果发现在急性心肌缺血期,刺激迷走神经可以抑制VFT的降低,并使再灌流后的VFT较快恢复,这种作用可被阿托品阻断。右心房起搏心率恒定的情况下,迷走神经对室颤阈的影响减弱。结果提示,迷走神经活动增强对缺血和再灌流的心脏均有保护作用。 In this paper, we observed the changes of ventricular fibrillation threshold (VFT) and the effect of vagus nerve stimulation on VFT in rabbits after acute myocardial ischemia and reperfusion. The results showed that in acute myocardial ischemia, stimulation of the vagus nerve can inhibit the reduction of VFT, and VFT after reperfusion faster recovery, this effect can be blocked by atropine. With a constant right atrial pacing rate, the effect of the vagus nerve on the ventricular fibrillation threshold is diminished. The results suggest that increased vagal activity may have protective effects on both ischemic and reperfused hearts.