Left atrial functional changes associated with repeated catheter ablations for atrial fibrillation

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Imaging

Background:

• The long-term effects of multiple atrial fibrillation (AF) ablations on left atrial (LA) mechanical function are not well understood.
• Limited data exists on the impact of repeated AF ablations on LA function.

Purpose of the Study:

• To investigate the impact of repeated catheter ablations for AF on left atrial mechanical function.
• To assess changes in peak longitudinal atrial strain (PLAS) following serial AF ablations.

Main Methods:

• Retrospective analysis of 108 AF patients undergoing two catheter ablations.
• Cardiac magnetic resonance imaging (MRI) performed pre- and post-ablation to measure PLAS.
• Sub-study of 36 patients with additional MRI to evaluate strain changes between procedures.

Main Results:

• No significant change in PLAS after the first ablation.
• A significant decline in PLAS was observed between the first and second ablations (post-ablation 1 to post-ablation 2).
• Both intervals between the first and second ablation (post-ablation 1 to pre-ablation 2) and after the second ablation (pre-ablation 2 to post-ablation 2) showed significant negative strain changes.

Conclusions:

• Repeated AF ablations are associated with a progressive decline in LA mechanical function.
• The natural progression of AF between ablations has a more detrimental effect on LA function than the ablation procedure itself.
• Repeat ablation remains an effective strategy for managing AF, even considering its impact on LA mechanical function.