A decrease in pulmonary vein diameter after radiofrequency ablation predicts the development of severe stenosis

Area of Science:

• Cardiology
• Interventional Cardiology
• Medical Imaging

Background:

• Radiofrequency ablation for atrial fibrillation can lead to pulmonary vein stenosis.
• Early detection of risk factors for pulmonary vein stenosis is crucial for patient management.

Purpose of the Study:

• To determine if a relative reduction in pulmonary vein diameter on day 1 post-ablation predicts severe pulmonary vein stenosis.
• To identify early predictors of pulmonary vein stenosis after atrial fibrillation ablation.

Main Methods:

• 104 patients with drug-refractory atrial fibrillation underwent MR angiography before and after radiofrequency ablation.
• Pulmonary vein diameter was measured at baseline, day 1 post-ablation, and every 3 months.
• Severe pulmonary vein stenosis was defined as >70% diameter reduction; a 25% reduction on day 1 was the prespecified cutoff.

Main Results:

• A relative reduction in pulmonary vein diameter on day 1 (RRPVD1) of ≥25% was strongly associated with the development of severe pulmonary vein stenosis (Hazard Ratio: 7.1, P < 0.0001).
• RRPVD1 was identified as the strongest independent predictor of severe pulmonary vein stenosis in a multivariate Cox regression model.
• Severe pulmonary vein stenosis was observed in 18 pulmonary veins during 12 months of follow-up.

Conclusions:

• A relative reduction in pulmonary vein diameter of 25% or more on day 1 after radiofrequency ablation is a strong independent predictor of severe pulmonary vein stenosis.
• This finding allows for early identification of patients at high risk for developing pulmonary vein stenosis post-ablation.
• Monitoring pulmonary vein diameter changes post-ablation can guide clinical management and follow-up strategies.