名词
中文翻译：心电图
同义词：
['QRS complex', 'QRS complex pattern', 'QRS complex sequence']
例句：
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1. The patient's ECG showed a QRS loop with a prolonged duration.
患者的心电图显示了一个QRS环，持续时间较长。
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2. The QRS loop was considered to be an indicator of myocardial ischemia.
QRS环被认为是心肌缺血的一个指标。
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3. During the electrocardiogram (ECG) test, the technician observed a QRS loop that was consistent with the patient'ssymptoms.
在心电图测试期间，技师观察到一个与患者症状一致的QRS环。