左侧房室慢旁路的电生理特征和射频消融靶点的定位

目的 :探讨左侧游离壁慢传导旁路的电生理特点和射频消融方法。方法 :5例患者诱发心动过速后用心室感知S2程序刺激中止心动过速确立心室为房室折返环的一部分。结果 :4例中止心动过速时无心房逆行 A波 ,1例有逆行 A波 ,旁路 1例有递减传导特点 ,均在心室侧消融成功。成功消融靶点 A波较冠状窦标测导管最早 A波提前 8～2 2 m s。结论 :心室感知 S2心室程序刺激终止心动过速是鉴别房性心动过速的可靠方法。

Electrophysiologic charateritics of slow conduction pathway in left freewall and localization of radiofrequency ablation

AIM: To study the electrophysiologic characteristics and method of radiofrequecy ablation in patients with slow conduction in left free wall. METHODS: When 5 cases induced tachycardia, using VS2 program stimulation terminate the tachycardia to establish that ventricle is the part of reentry circle. RESULTS: No retrograde A waves in 4 cases but only 1 case present A wave in terminating tachycardia. The accessory pathways have decreasing conduction in one case. Successful ablation were located in ventricle sides. A wave of successful targets ahead of A wave of any coronary sinus leads is 8~22 ms.CONCLUSION: Ventricular sense and S2 program stimulation to terminate tachycardia is reliable method to different atrial tachycardia.