三维电解剖标测系统与CT影像融合指导心房颤动导管消融

背景:目前通常采用的肺静脉前庭定位方法主要有三维电解剖标测系统指导(CARTO)或与CT/核磁共振影像融合定位(CARTO-Merge)两种方法.理论上讲CARTO-Merge技术提供了更多的解剖细节,导航精确度更高,但其是否有利于提高房颤导管消融治疗的成功率及安全性仍有待临床观察评价.目的:验证三维电解剖标测系统联合CT影像融合在指导房颤导管消融中的作用.设计、时间及地点:对比观察,于2005-10/2007-05在首都医科大学附属北京安贞医院心内科完成.对象:选择进行环肺静脉前庭线性消融治疗的阵发性房颤患者93例.方法:试验分为2组,CARTO组50例,CARTO-Merge组43例,分别于CARTO系统及CARTO-Merge指导下行环肺静脉前庭线性消融,消融终点为肺静脉隔离.主要观察指标:比较两组操作时间,X射线照射时间,手术成功率及并发症等情况.结果:所有患者均实现消融终点,随访时间(12.6±2.9)个月,73例(78.5%)患者消融后3个月无房性心律失常复发.CARTO组X射线照射时间显著长于CARTO-Merge组(P<0.05),两组操作时间、消融时间、消融成功率及并发症比较差异无显著性意义(P>0.05).结论:采用单纯CARTO或联合CT影像融合技术指导的环肺静脉前庭消融均具有良好的临床疗效和安全性.但CT影像融合技术可更清楚展示心脏解剖,有利于肺静脉的准确定位,并显著缩短X射线透视时间.

CT image integration into three-dimensional electroanatomical mapping system on guidance for catheter ablation of atrial fibrillation

BACKGROUND:Circumferential pulmonary vein antrum ablations guided by CARTO system or integration of a computed tomographic or magnetic resonance imaging scan (CARTO-Merge) are two main locating methods.Theoretically,CARTO-Merge provides a detailed appreciation of the pulmonary vein anatomy,however,whether it can improve the safety and success of catheter ablation of atrial fibrillation remains uncertainly.OBJECTIVE:To explore the effect of CT image integration into three-dimensional (3D) electroanatomical mapping system on clinical outcomes of catheter ablation of atrial fibrillation.DESIGN,TIME AND SETTING:The randomized contrast observation was performed at Department of Cardiology of Beijing Anzhen Hospital from October 2005 to May 2007.PARTICIPANTS:A total of 93 patients with drugs refractory,paroxysmal atrial fibrillation who underwent circumferential pulmonary vein antrum ablation.METHODS:All patients underwent circumferential pulmonary vein antrum ablation using irdgated radiofreguency ablation with the endpoint of electrical isolation.Ablation was guided by 3D mapping alone in 50 patients (CARTO group) or by CT image integration in 43 patients (CARTO-Merge group).MAIN OUTCOME MEASURES:Procedure-related parameters,such as procedure duration,fluoroscopy duration,cumulative success rate and complication,were compared between the two groups.RESULTS:Pulmonary veins were isolated in all patients.After (12.6±2.9) months follow-up,73 (78.5%) patients did not have recurrence of atrial fibrillation at 3 month after the procedure.The fluoroscopy time in CARTO group was significant longer than that in CARTO-Merge group (P<0.05).The mean procedure duration,radiofrequency ablation duration,procedure-related complication and cumulative success rate were comparable between the 2 groups.CONCLUSION:Circumferential pulmonary vein antrum ablation guided by 3D mapping alone or by CT integration had similar safety and success rate in paroxysmal atrial fibrillation patients.But CT integration,which facilitated to a detailed representation of the anatomy of left atrium,is associated with reduced fluoroscopy duration.