cardiac index

例句：

1. 1. The doctor ordered an electrocardiogram to measure the patient's cardiac index.
   医生要求进行心电图检查来测量患者的心脏指数。
2. 2.During exercise, the heart rate and cardiac index increase significantly.
   在运动时，心率和心脏指数显著增加。
3. 3. A high cardiac index is associated with a higher risk of heart failure.
   高心脏指数与更高的心脏病风险相关。