endocardial electrode

例句：

1. 1.The endocardial electrode was used to monitor the patient's heart rhythm during surgery.
   心内膜电极用于手术期间监测患者的心脏节律。
2. 2. The endocardial electrode was inserted through a small incision in the patient's chest.
   心内膜电极通过患者胸部的小切口插入。
3. 3. The endocardial electrode was used to record the patient's electrical activity during the procedure.
   心内膜电极用于记录患者在手术过程中的电活动。