precordial leads

例句：

1. 1. The patient's precordial pain was relieved by the medication.
   病人的胸痛通过药物得到了缓解。
2. 2. The doctor performed an electrocardiogram on the patient for a thorough examination.
   医生为患者进行了心电图检查，以便进行全面的诊断。
3. 3. During the test, the technician monitored the patient's precordial rhythm closely.
   在测试过程中，技师密切监测了患者的心律。