Characteristics of catheter ablation
The average procedure time was 151.8±4.6 mins in the CLBBB group and 156.7±10.5 mins in the Non-CLBBB group (P=0.651). The fluoroscopy time was 6.2±0.4 and 5.7±0.6 mins in the two groups, respectively. Pulmonary veins isolation was achieved in all the patients in the two groups. Superior vena cava isolation was achieved in 10 patients (23.8%) in the CLBBB group and 37 patients (22.0%) in the Non-CLBBB group (P=0.084). Besides pulmonary veins, the proportion of additional ablation target did not differ between the CLBBB and Non-CLBBB groups including left atrial roof line ablation (42.9% vs. 41.7%, P=0.889), mitral isthmus line ablation (42.9% vs. 41.7%, P=0.889), left atrial complex fractionated atrial electrograms (33.3% vs.23.2%, P=0.164), and cavotricuspid isthmus line ablation (52.4%vs.44.6%, P=0.368). Conduction blocks were obtained in all the left roof line and cavotricuspid isthmus line ablation. There was no significant difference in conduction block across the mitral isthmus line between the two groups (83.3% vs. 85.7%, P=0.724). There was one patient had pseudoaneurysms after procedure in the CLBBB group (2.4%), and two patients with inguinal hematomas in the Non-CLBBB group (2.4% vs 1.2%, P=0.561).