ventricular pacing

例句：

1. 1. The patientwas placed on a ventricular pacer to regulate his heartrate.
   患者被安置了心室起搏器来调节他的心率。
2. 2. The doctorinserted the pacer into the patient's chest and started the device.
   医生将起搏器插入患者的胸部并启动了设备。
3. 3. The pacer is designed tohelp patients with heart conditions by regulating their heartbeat.
   起搏器旨在帮助患有心脏病的患者通过调节心跳来改善状况。