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波群的开始点
早搏的开始点
间的
间，称为
间。
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波群的开始点早搏的开始点间的间，称为间。
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