Extrasystole before the QRS complex and the starting point of VPB between the starting point of time, known as the coupling of time.
早搏前
QRS波群开始点与室性早搏开始点之间时间，称为偶联时间。
;
室;脏;脏收缩;
;电图;肌;Extrasystole before the QRS complex and the starting point of VPB between the starting point of time, known as the coupling of time.
早搏前QRS波群开始点与室性早搏开始点之间时间，称为偶联时间。
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