Early reverse remodeling of the mitral valve apparatus following atrial fibrillation ablation: insights from a prospective echocardiographic study

Introduction Atrial fibrillation (AF) ablation is an established rhythm control strategy, but its impact on mitral valve (MV) geometry and functional mitral regurgitation (MR) has not been fully clarified. Since atrial and valvular mechanics are closely interrelated, structural remodeling of the MV apparatus may occur following restoration of sinus rhythm. Methods Twenty-one consecutive patients who underwent successful cryoballoon ablation for paroxsymal and persistent atrial fibrillation (maintaining sinus rhythm for 3 months after their procedure) were examined by serial real-time 3-dimensional transesophageal echocardiography before and 3 months after ablation. Mitral valve complex geometry was measured using dedicated software for 3-dimensional transesophageal echocardiography. Results Prospectively studied 21 patients (mean age 61.4±8.2 years, 62% male, 57% paroxysmal AF) undergoing AF ablation. Hypertension (67%) and coronary artery disease (38%) were the most frequent comorbidities. Echocardiographic assessment included annular, leaflet, and subvalvular parameters, as well as serum BNP levels. At 3-month follow-up, a significant reduction was observed in tenting volume (6.04±1.95 vs 4.44±1.89 cm³, p=0.023) and a significant increase in annular height (1.15±0.17 vs 1.28±0.17 cm, p=0.013) (Figure 1) . Trends toward improvement were seen in posterior leaflet angle (51.2° vs 44.9°, p=0.076) and anterior closure length (3D: 3.97±0.69 vs 3.67±0.51 cm, p=0.084). Other annular dimensions, leaflet areas, and BNP levels (baseline 851±2043 vs 760±1790 pg/mL, p=0.328) did not show significant differences, although BNP levels decreased. (Table 1) Clinical improvement was reflected by a reduction in EHRA symptom class in more than half of the patients. Conclusion & Discussion Our findings demonstrate that AF ablation induces favorable early remodeling of the MV apparatus, with decreased tenting volume and increased annular height. These changes may contribute to the reduction of functional MR, supporting the hypothesis that sinus rhythm restoration has structural as well as electrical benefits. Although statistical significance was limited to selected parameters, the observed trends in leaflet geometry further suggest a beneficial effect on MV dynamics. The absence of significant change in BNP may reflect the short follow-up interval. The relatively small cohort and single-center design limit generalizability, yet the study highlights a potential mechanistic pathway by which AF ablation improves valvular function and functional MR. Larger prospective studies with long-term follow-up are needed to validate these observations.