Key result
Segmental ostial catheter ablation using higher RF power, a larger tip catheter, and additional RF deliveries increased freedom from atrial fibrillation compared to standard ablation.
Why the study?
Does segmental ostial catheter ablation with higher RF power, a larger tip catheter, and additional RF deliveries reduce the recurrence of paroxysmal atrial fibrillation compared to lower power and a smaller tip catheter?
Cohort (n=108)
Does segmental ostial catheter ablation with higher RF power, a larger tip catheter, and additional RF deliveries reduce the recurrence of paroxysmal atrial fibrillation compared to lower power and a smaller tip catheter?
Using a higher RF power (40 W), larger tip catheter (8 mm), and additional RF deliveries during segmental ostial catheter ablation significantly improves freedom from paroxysmal atrial fibrillation.
Answers are grounded in this paper and cite their sources.
Higher-power segmental ostial ablation was associated with greater AF freedom; extends SOCA techniques but requires randomized confirmation.
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.
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Yamada et al. (2006) conducted a cohort in Paroxysmal atrial fibrillation (PAF) (n=108). Segmental ostial catheter ablation (SOCA) with 40 W maximum output, 8 mm tip catheter, and additional RF deliveries vs. SOCA with 30 W maximum output and 4 mm tip catheter was evaluated on Freedom from PAF after multiple procedures (p=<0.05). Segmental ostial catheter ablation using higher RF power, a larger tip catheter, and additional RF deliveries increased freedom from atrial fibrillation compared to standard ablation.
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