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
点与室性早搏点之
时，称为偶
时。
Extrasystole before the QRS complex and the starting point of VPB between the starting point of time, known as the coupling of time.
早搏前QRS波群点与室性早搏点之时，称为偶时。
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