慢径消融时出现交界区心律伴室房逆传阻滞意义的再探讨

目的探讨慢径消融过程中出现交界区心律伴室房逆传阻滞的意义。方法房室结折返性心动过速经射频消融治疗患者,共91例。采用由低至高的逐点递进的方法进行消融,放电中注意观察交界区心律伴逆传阻滞现象的出现。结果所有病例均获得手术成功,其中3例首次消融后复发。91例手术中有47例曾出现交界区心律伴逆传阻滞,与无逆传阻滞组相比较,手术时间及曝光时间无明显差异,但放电次数多于后者;在共计309次有效放电中,95次有室房逆传阻滞,与214次无逆传阻滞者相比较,其靶点与His束电极间垂直距离明显小于后者,伴发一过性房室传导阻滞(AVB)的比例亦明显大于后者(12.63%vs 2.39%),多元Logistic回归分析发现靶点到HBE电极间垂直距离≤1.5 cm是房室前传阻滞的独立相关因素(OR=12.50,P=0.018),而交界区心律伴逆传阻滞与AVB间相关性不明确(P>0.05)。结论在消融慢径的过程中,出现交界区心律伴逆传阻滞与房室前向传导阻滞之间并无明确的相关性,而消融靶点过高则是出现AVB的独立危险因素。

Reinvestigation of the significance of junctional rhythm with ventriculoatrial block appearing during radiofrequency ablation of the slow pathway

Objective To investigate the significance of junctional rhythm with ventriculoatrial block appearing during radiaofrequency ablation of the slow pathway. Methods Ninety-one patients who had been performed the operation of radiofrequency catheter ablation for atrioventricular reentrant tachycardia(AVNRT) were included in this study.The ablation catheter was moved high stepwise until the endpoint had been attained.Special attention was paid to the phenomenon of junctional rhythm with ventriculoatrial block ap...