pulse dropout

例句：

1. 1. The patient's pulse dropped out, and he needed immediate medical attention.
   病人的脉搏停止了，他需要立即医疗援助。
2. 2. During the race, his heart rate dropped out several times due to exhaustion.
   比赛中，由于疲劳他的心率几次降到零点几。
3. 3. After a long day at work, she felt her pulse drop out as she lay down for the night.
   工作了一整天后，她躺下来准备睡觉时感觉到脉搏停止了。