cardiac waves

例句：

1. 1. The heart's electrical activity is captured by the ECG machine.
   心电图机捕捉到心脏的电活动。
2. 2.Cardiac arrhythmias can lead to serious health problems.
   心律失常可能导致严重的健康问题。
3. 3. During atrial fibrillation, the cardiac waves are irregular.
   在房颤期间，心电波形不规则。