Cryoballoon ablation for paroxysmal atrial fibrillation mildly improves lung function: An observational study

Area of Science:

• Cardiology
• Pulmonology
• Medical Technology

Background:

• Atrial fibrillation (AF) is a prevalent arrhythmia with significant public health implications.
• Catheter ablation (CA) is an effective AF treatment, with cryoballoon ablation (CBA) gaining popularity over radiofrequency catheter ablation (RFCA).
• Pulmonary dysfunction is linked to AF, and CA's impact on lung function post-procedure remains under-assessed, particularly in paroxysmal AF (PAF).

Purpose of the Study:

• To evaluate the effect of catheter ablation on pulmonary function in patients with and without paroxysmal atrial fibrillation (PAF) post-ablation.
• To compare the pulmonary function outcomes between different CA techniques, including RFCA and CBA.
• To identify if specific ablation methods offer superior pulmonary benefits for PAF patients.

Main Methods:

• A prospective, single-center study involving 26 patients with symptomatic PAF and 18 without.
• Pulmonary function was assessed using spirometry (VC, FVC, FEV1, peak expiratory flow) 6 months after CA.
• CA techniques included RFCA, CBA, hot balloon ablation, and laser balloon-mediated ablation.

Main Results:

• Overall CA significantly improved vital capacity (VC), forced vital capacity (FVC), and peak expiratory flow in all patients.
• In PAF patients, CA led to a significant increase in forced expiratory volume (FEV1).
• Cryoballoon ablation (CBA) significantly improved VC and FVC, particularly in PAF patients, whereas hot balloon ablation showed a decrease in FEV1.

Conclusions:

• Catheter ablation for AF demonstrates significant improvements in pulmonary function parameters.
• Cryoballoon ablation (CBA) appears to be a more suitable strategy for paroxysmal AF (PAF) patients, especially those with pre-existing pulmonary compromise.
• Further research is warranted to confirm CBA's superiority in preserving or improving lung function in PAF patients.