Catheter ablation for atrial fibrillation results in greater improvement in cardiac function in patients with low versus normal left ventricular ejection fraction

It is still unknown whether left ventricular ejection fraction (LVEF) might affect the magnitude of improvement after atrial fibrillation (AF) ablation on cardiac function in persistent or longstanding persistent AF (CAF) patients. We performed echocardiography in 35 patients with CAF before and after catheter ablation (CA). Patients were stratified by LVEF into two groups prior to CA-normal LVEF (a parts per thousand yen50 % LVEF, N group, n = 24) and a low LVEF group (< 50 % LVEF, L group, n = 11). Patients were followed at 1 month, 3 months, 6 months, 1 year, and 2 years after ablation. After 15.8 +/- 7.4 months follow-up, the L group showed greater improvement in LVEF and left atrial ejection fraction (LAEF; N group vs L group: LVEF difference (%), 5 +/- 8 vs 20 +/- 13, p < 0.01; LAEF difference (%), 11 +/- 12 vs 21 +/- 10, p < 0.05). LA maximal volume and E/e' showed the same tendency after ablation, although the extent of improvement was not statistically significant. Both groups showed almost the same time course of improvement up to 2 years, although the L group showed earlier recovery in LVEF. The greater improvement in several cardiac functions was seen in patients with greater LV dysfunction, after the CA for CAF.