International Heart Journal
Online ISSN : 1349-3299
Print ISSN : 1349-2365
ISSN-L : 1349-2365
Clinical Studies
Can Segmental Pulmonary Vein Ablation Reduce the Recurrence of Atrial Fibrillation When Using a Higher RF Power, Larger Tip Electrode Catheter, and Additional RF Deliveries?
The limitations of point-by-point RF ablation
Takumi YamadaYoshimasa MurakamiTaro OkadaMitsuhiro OkamotoTakeshi ShimizuJunji ToyamaYukihiko YoshidaNaoya TsuboiTeruo ItoMasahiro MutoTakahisa KondoYasuya IndenMakoto HiraiToyoaki Murohara
Author information

2006 Volume 47 Issue 2 Pages 219-228


The aim of this study was to investigate whether segmental ostial catheter ablation (SOCA) designed to prevent the electrical connections (ECs) between the left atrium and pulmonary veins (PVs) might help increase the efficacy of SOCA in paroxysmal atrial fibrillation (PAF).
PV mapping and successful SOCA were performed with a basket catheter in 108 consecutive patients with PAF. Radiofrequency energy was delivered using a maximum output of 30 W with a 4 mm tip catheter (group I; 47) or 40 W with an 8 mm tip catheter (group II; 61). Only in the group II patients were additional radiofrequency deliveries to the specific sites where the ECs tended to recover performed after successful SOCA. After the first procedure, PAF recurred in 47% of the group I patients and 32% of the group II patients. In all 27 patients who underwent repeat procedures, EC recoveries were observed more frequently in group I than in group II (69% versus 49%; P < 0.05). After multiple procedures, there was more freedom from PAF in group II (84%) than in group I (66%) (P < 0.05).
SOCA with a higher RF power, larger tip catheter, and additional RF deliveries could achieve a more effective SOCA.

Content from these authors
© 2006 by the International Heart Journal Association
Previous article Next article