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
性早搏的开始
的
，称为偶
。
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波群的开始性早搏的开始的，称为偶。
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