Extrasystole before the QRS complex and the starting point of VPB between the starting point of time, known as the coupling of time.
早搏前的QRS波群的
与室性早搏的之
的时，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.
早搏前的QRS波群的与室性早搏的之的时，称为偶联时。
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