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
开始点与室性早搏开始点
间时间，称为偶联时间。
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QRS开始点与室性早搏开始点间时间，称为偶联时间。
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