@entity713 during radiofrequency catheter ablation of XXXX : incidence, mechanism, and clinical implications.

@entity713 @entity1 @entity956 @entity714
AIMS: To evaluate the incidence, mechanism, and clinical implications of atrioventricular (AV) block during catheter radiofrequency (RF) ablation of the cavotricuspid isthmus (CTI). Although RF ablation of @entity956 is the most frequently performed ablation procedure, data on the incidence and significance of an @entity713 occurring during the procedure are scarce. METHODS AND RESULTS: Consecutive @entity1 (n=845, 73.5% male) undergoing CTI ablation (913 procedures) between 1998 and 2010 were studied. Data on the occurrence of complete @entity713 (lasting>= 3 s) during the procedure were prospectively collected. Sixteen (1.9%) @entity1 experienced @entity713 , 12 during delivery of RF pulses (Group 1) and 4 (Group 2) during manipulation of catheters in the cardiac chambers. The @entity713 was short lived (<1 min), located in the AV node, and associated with septal isthmus RF lines in 11 Group 1 @entity1 . It was long-lasting and led to pacemaker implantation in one Group 1 @entity1 . @entity713 had an infranodal location in four Group 2 @entity1 , all of whom had a pre-existing complete @entity714 ( @entity714 ). One Group 2 @entity1 had an @entity713 during his two ablation procedures. Permanent pacemakers were implanted in five (0.6%) @entity1 (one from Group 1 and four from Group 2). CONCLUSIONS: @entity713 requiring pacemaker implantation following administration of RF pulses at the CTI are rare (0.12%). The occurrence rate of @entity713 related to the procedure and requiring pacemaker implantation is, however, not negligible (0.6%) and mostly affects @entity1 with a pre-existing complete @entity714 .
