Ablation-induced left atrial mechanical dysfunction recovers in weeks after ablation.

Area of Science:

• Cardiology
• Medical Imaging
• Electrophysiology

Background:

• The immediate impact of catheter ablation on left atrial mechanical function and its recovery timeline in atrial fibrillation (AF) patients are not well understood.
• The response of atrial mechanical function to catheter ablation across different AF types requires further investigation.

Purpose of the Study:

• To assess the immediate effects of catheter ablation on left atrial mechanical function.
• To determine the recovery timeline of left atrial mechanical function post-ablation.
• To compare the impact of ablation on mechanical function between paroxysmal and persistent AF patients.

Main Methods:

• Retrospective study including 113 AF patients.
• Three cardiac magnetic resonance imaging (MRI) studies per patient: pre-ablation, immediate post-ablation (within 2 days), and follow-up (≤3 months).
• Feature tracking analysis of MRI cine images to quantify peak longitudinal atrial strain (PLAS).

Main Results:

• PLAS significantly decreased immediately after ablation compared to pre-ablation and follow-up levels.
• Left atrial mechanical function, measured by PLAS, recovered to 95% of pre-ablation levels within 10 days.
• While pre-ablation PLAS was higher in paroxysmal AF patients, the immediate post-ablation reduction in PLAS was similar across paroxysmal and persistent AF types.

Conclusions:

• Catheter ablation causes a significant, but transient, drop in left atrial mechanical function (PLAS).
• Left atrial mechanical function recovers remarkably quickly, within 10 days post-ablation.
• The immediate functional impact of ablation on the left atrium is comparable between paroxysmal and persistent AF patients.