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波群的开始点与室性早搏的开始点之
的时，称为偶联时。
} wave groupExtrasystole 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波群的开始点与室性早搏的开始点之的时，称为偶联时。
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