摘要:
Objective To investigate the diagnostic value of type "m" QRS morphology in lead I for ventricular arrhythmia.Methods We retrospectively analyzed 357 patients with successful radiofrequency ablation in our hospital.According to the successfully ablated target,the patients were divided into two groups:left ventricular outflow tract (LVOT) group (Group A,n=139),right ventricular outflow tract (RVOT) group (Group B,n=218).The case number of type "m" QRS morphology in lead I,the amplitude of QRS wave in lead I,the target position,and the target potential of the two groups were compared.Results ①In group A,9 cases with type m QRS morphology in lead I were recorded;in group B,30 cases with type m QRS morphology in lead I were recorded,the incidence rate of group B was larger than group A,with statistical difference(6.5% vs 13.8%,P<0.05).②QRS wave amplitude in group A was larger than group B in lead I,with statistical difference [(0.38±0.13) mV vs (0.21±0.13) mV,P<0.01],but there was no statistical difference of QRS wave duration in Lead I between the two groups [(129.0±29.4) ms vs (145.6±26.0) ms,P>0.05].③The successful ablated target position was located at the anterior side of RCC in group A and that was located at septal side of the junction between RVOT free wall and septal wall near the pulmonary valve in group B,with close anatomical position between the two groups.The V-QRS interval of group A was smaller than in group A that group B,with statistical difference[(31± 12.3) ms vs (21±5.7) ms,P<0.05].Conclusion Type "m" QRS morphoeogy in lead I in parients with outflow tract ventricular arrhythmia indicates that successful ablation target is at LCC/RCC junction,RCC anterior part,septal side of the junction between RVOT free wall and septal wall near the pulmonary valve.The RVOT origin is more often than LVOT origin,with close anatomical position between the two groups.%目的 探讨心电图Ⅰ导联QRS波形态呈m型在流出道室性心律失常(PVC)中的定位诊断价值.方法 回顾性分析成功行射频消融的流出道PVC患者357例,根据消融成功的心腔分为两组:左室流出道(LVOT)消融成功者(A组,n=139),右室流出道(RVOT)消融成功者(B组,n=218),比较两组患者心电图Ⅰ导联QRS波呈m型的例数、Ⅰ导联QRS波的振幅、靶点位置及靶点图电位特点.结果 ①A组患者9例Ⅰ导联QRS波形态呈m型,B组患者30例Ⅰ导联QRS波形态呈m型,发生率有显著差异(6.5% vs 13.8%,P<0.05).②两组患者Ⅰ导联QRS波振幅有显著差异[(0.38±0.13) mVvs (0.21±0.13) mV,P<0.01];两组患者Ⅰ导联QRS波时程差异无显著性[(129.0±29.4) ms vs (145.6±26.0) ms,P>0.05].③A组消融成功靶点位置位于RCC前部,B组消融成功靶点位置位于RVOT左侧肺动脉瓣附近游离壁、间隔交界处的间隔侧,两者靶点解剖位置相距较近.④两组靶点图V波提前QRS波程度有显著差异[(31±12.3) ms vs (21±5.7) ms,P<0.05].结论 流出道PVC的Ⅰ导联QRS波形态呈m型提示消融成功靶点位置在RCC前部,或RVOT左侧肺动脉瓣附近游离壁、间隔交界处的间隔侧,RVOT起源多于LVOT起源,且两者靶点解剖位置相距较近.