Impacts of sinus rhythm maintenance with catheter ablation on exercise tolerance in patients with paroxysmal atrial fibrillation.

Abstract

It has been recently reported that sinus rhythm (SR) maintenance with catheter ablation therapy improves exercise tolerance (ET) in patients with persistent atrial fibrillation (AF). However, it remains to be elucidated whether this is also the case for patients with paroxysmal AF (PAF). We enrolled consecutive 54 patients with PAF (age; 63 ± 10 [SD] years old, male/female 46/8) and 26 patients with persistent AF (non-PAF) (age; 57 ± 12 [SD] years old, male/female 23/3) who underwent AF ablation without recurrence. ET and cardiac function were evaluated by cardio-pulmonary exercise test and ultrasound echocardiography before and 6months after ablation. The parameters of cardiopulmonary exercise test were comparable between the 2 groups. When PAF group was divided into 2 groups according to the time since diagnosis, peak oxygen uptake (peak VO2) before ablation was significantly lower in patients with PAF duration of more than 1year (n= 26), compared with those with less than 1year (n= 28) (18.1 ± 3.7 vs 21.3 ± 5.8ml/kg/min, P= 0.022). At 6months after SR maintenance without AF burden, peak VO2 significantly improved in both PAF (19.8 ± 5.1 to 22.0 ± 4.8ml/kg/min, P= 0.0001) and non-PAF (20.6 ± 3.9 to 23.4 ± 5.0ml/kg/min, P < 0.01). Furthermore, the improvement rate of peak VO2 after successful ablation had a highly significant inverse relationship with peak VO2 at baseline in patients with PAF (r= - 0.48, P= 0.0003). These results indicate that SR maintenance with ablation improves ET in patients with PAF, especially in those with reduced ET.