The most common reason for sudden cardiac arrest is a very chaotic heart rhythm (ventricular fibrillation), which occurs as a result of a heart attack.
心脏骤停的最常见原因是由心肌梗塞引起的心率极度紊乱（如室颤）。
2
See you, I will sickroom redness, chaotic heart rhythm abuse.
见到你后，我会脸儿发红，心儿乱了节奏。
3
An important example is the chaotic behavior of ventricular fibrillation, a severely abnormal heart rhythm that is often life-threatening.