患者男性,57岁,心脏结构和基础心电图均正常,因心房颤动而接受肺静脉隔离手术。电生理检查中八极电极置于希氏束,消融电极置于中位右心房:基础状态下,窦性心律周长890ms,A-H间期48ms,H-V间期80ms,QRS日寸间80ms.:期外心房起搏刺激时,H-V间期缩短而QRS波群增宽呈左束支传导阻滞图形(图1)以周长330ms心房猝发刺激证实进行性H-V间期缩短和QRS波群 Male, 57 years old, with normal cardiac structure and underlying electrocardiogram and pulmonary vein isolation due to atrial fibrillation. Electrophysiological examination octupole electrodes placed in His bundle, ablation electrodes placed in the right right atrium: basic state, sinus rhythm circumference 890ms, AH interval 48ms, HV interval 80ms, QRS day interval 80ms .:. During extra-atrial pacing stimulation, the HV interval was shortened and the QRS wave group was broadened as the left bundle branch block pattern (Figure 1). The shortening of the HV interval and the QRS complex were confirmed with an atrial burst of 330 ms in circumference