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波群开始点与室性早搏开始点之
，称为偶
。
词
词
;;;
痛;;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波群开始点与室性早搏开始点之，称为偶。
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