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).