Key result
Extended laser balloon ablation resulted in a significantly smaller non-isolated posterior wall area (8.5 vs 12.4 cm2, p<0.01) and lower cardiac injury markers compared to cryoballoon ablation.
Why the study?
Laser balloons allow adjustable balloon sizing, but lesion characteristics of standard laser balloon ablation followed by a maximally extended balloon compared to cryoballoon ablation were not established.
Does extended laser balloon ablation improve pulmonary vein isolated area and reduce cardiac injury compared to cryoballoon ablation in patients with paroxysmal atrial fibrillation?
Observational (n=65)
Yes
Does extended laser balloon ablation improve pulmonary vein isolated area and reduce cardiac injury compared to cryoballoon ablation in patients with paroxysmal atrial fibrillation?
Absolute Event Rate: 8.5% vs 12.4%
p-value: p=<0.01
Extended laser balloon ablation achieves a larger isolated area in the superior pulmonary veins with less acute myocardial injury compared to cryoballoon ablation, though it requires longer procedure times.
Balloon ablation therapy has recently been used for atrial fibrillation (AF) ablation. Laser balloons possess the property in which the balloon size can be changed. Standard laser balloon ablation (Standard LBA) was followed by additional ablation using a maximally extended balloon (Extended LBA) and its lesion characteristics were compared to cryoballoon ablation (CBA), another balloon technology. From June 2020 to July 2021, patients with paroxysmal AF who underwent an initial pulmonary vein (PV) isolation were enrolled. Sixty-five patients with paroxysmal AF were included, 32 in the LBA and 33 in the CBA group. To measure the isolated surface area after the ablation procedures, left atrial voltage mapping was performed after Standard LBA, Extended LBA, and CBA. The baseline patient characteristics did not differ between LBA and CBA. Extended LBA could successfully increase the isolated area more than Standard LBA for all four PVs. Compared to CBA, the isolated area of both superior PVs was significantly greater with Extended LBA (left superior PV: 8.5 ± 2.1 vs 7.3 ± 2.4, p = 0.04, right superior PV: 11.4 ± 3.7 vs 8.7 ± 2.7, p < 0.01), and thus the non-isolated posterior wall (PW) was smaller (8.5 ± 3.4 vs 12.4 ± 3.3, p < 0.01). Nevertheless, changes in the cardiac injury markers were significantly lower with LBA than CBA. There was no significant correlation between the cardiac injury level and isolated area in both groups. In conclusion, Extended LBA exhibited a significantly greater isolation of both superior PVs and resulted in a smaller non-isolated PW, but the cardiac injury markers were significantly suppressed as compared to CBA.
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Ohkura et al. (2022) conducted an observational in Paroxysmal atrial fibrillation (n=65). Extended visually guided laser balloon ablation vs. Cryoballoon ablation was evaluated on Non-isolated posterior wall surface area (cm2) (p=<0.01). Extended laser balloon ablation resulted in a significantly smaller non-isolated posterior wall area (8.5 vs 12.4 cm2, p<0.01) and lower cardiac injury markers compared to cryoballoon ablation.
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