Hot balloon vs. cryoballoon ablation for persistent atrial fibrillation:
lesion area, efficacy, and safety
Abstract
Introduction: The clinical efficacy and safety of hot balloon ablation
(HBA) for treatment of persistent AF (PerAF) remain unclear. We aimed to
evaluate the clinical efficacy and safety of HBA vs. cryoballoon
ablation (CBA) as treatment for PerAF. Methods: Of 195 consecutive
patients who underwent initial catheter ablation for PerAF (AF lasting
>7 days but <12 months), 158 propensity
score-matched (79 HBA and 79 CBA) patients were included in our study.
All patients who underwent HBA received applications of energy to the
upper posterior LA wall with a larger balloon in addition to single
shots to each pulmonary vein (PV) ostium, whereas those who underwent
CBA received simple single-shot applications. The electrically isolated
surface area (ISA), including the PV antrum and part of the posterior LA
wall, was assessed by high-resolution mapping. Results: Success of the
PV isolation with balloon shots alone did not differ between HBA and CBA
(81% vs. 85%; P = 0.52). The ISA was generally wide in both groups and
significantly larger in the HBA group than in the CBA group (61 ± 16%
vs. 51 ± 12%, P < 0.001). The incidence of procedure-related
complications did not differ significantly (HBA 4% vs. CBA 1%; P =
0.62) nor did the arrhythmia recurrence rate (HBA 11% vs. CBA 18% at
18 months; P = 0.26). Conclusion: Despite the difference in protocols,
HBA and CBA performed for PerAF appear comparable in terms of wide
antral lesion creation, clinical efficacy, and safety.