Extrasystole before the QRS complex and the starting point of VPB between the starting point of time, known as the coupling of time.
早
QRS波群开始点与室性早开始点之
时，称为偶联时。
Extrasystole before the QRS complex and the starting point of VPB between the starting point of time, known as the coupling of time.
早QRS波群开始点与室性早开始点之时，称为偶联时。
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