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收缩时间间期惯常是通过同时记录心电图、心音图和颈动脉波测算。电-机械收缩(QS_2)系测量QRS综合波开始至主动脉瓣关闭的时间,左室喷血
Contraction time interval is usually through the simultaneous recording of ECG, phonocardiogram and carotid artery wave measurements. Electro-mechanical contractions (QS_2) measure the QRS complex to the aortic valve closure time, left ventricular ejection