Atrial conduit function quantitation precardioversion predicts early arrhythmia recurrence in persistent atrial...

Area of Science:

• Cardiology
• Echocardiography
• Electrophysiology

Background:

• Increasing incidence of atrial fibrillation (AF) due to population aging.
• High rates of AF recurrence post-electrical cardioversion (ECV) lead to overuse of ECV.
• Need for improved methods to predict AF recurrence after ECV.

Purpose of the Study:

• To evaluate the predictive value of a novel 3D echocardiography-derived measure of left atrial conduit (LAC) function.
• To assess LAC's ability to predict early AF recurrence following ECV.

Main Methods:

• 106 patients with persistent nonvalvular AF undergoing ECV were studied.
• 3D echocardiography was used to calculate LAC function before ECV.
• LAC was defined as [(LV max - LV min) - (LA max - LA min)] volume, expressed as % LV stroke volume.
• AF recurrence was monitored using Holter monitoring.

Main Results:

• One month post-ECV, 40 patients experienced AF recurrence.
• Patients with AF recurrence showed significantly higher pre-ECV LAC contribution to LV filling (P<0.0001) and left atrial stiffness (P<0.0001).
• Multivariate analysis identified LAC (P<0.001), left atrial stiffness (P=0.002), and volume (P=0.043) as independent predictors of early AF recurrence.
• ROC analysis demonstrated LAC as the strongest predictor (AUC 0.84, P<0.0001), with a cut-off >54% showing 76% sensitivity and 75% specificity.

Conclusions:

• Elevated LAC in patients with persistent AF reflects impaired left atrial and LV diastolic function, disrupting atrioventricular interaction.
• This disruption contributes to AF perpetuation.
• LAC quantification is a powerful predictor of early AF recurrence after ECV, offering clinical utility.