INFLUENCE OF ATRIOVENTRICULAR JUNCTION RADIOFREQUENCY ABLATION IN PATIENTS WITH CHRONIC ATRIAL-FIBRILLATION AND FLUTTER ON QUALITY-OF-LIFE AND CARDIAC-PERFORMANCE

The purpose of this study was to evaluate the effects of atrioventricular junction radiofrequency ablation on the quality of life, exercise performance, and echocardiographic parameters in 23 patients with chronic, severely symptomatic, drug-refractory atrial fibrillation or flutter. Initially, patients were randomized to receive ablation plus pacemaker therapy (n = 12) or pacemaker therapy alone (n = 11). After 15 days, palpitations decreased by 92% and 37% (p = 0.004), rest dyspnea by 79% and 40% (p = NS), effort dyspnea by 65% and 30% (p = 0.03), exercise intolerance by 54% and 17% (p = 0.005), and asthenia by 67% and 31% (p = 0.02) in the 2 groups, respectively. At the end of this shortterm study, control patients also underwent ablation therapy, and a 3-month intrapatient followup study was performed in 22 patients. New York Heart Association functional class greater than or equal to 3 was present in 14 patients (64%) before, but in only 3 patients (14%) after ablation therapy (p = 0.002); specific activity scale functional class 13 was present in 9 patients (41%) before, but in only 5 (23%) after ablation therapy (0 = NS). Exercise duration during standardized stress testing increased by a mean of 63 +/- 93 seconds (15% increase) (p = 0.001). In the 9 patients with depressed left ventricular systolic function, echocardiographic fractional shortening increased by 34% (from 23 +/- 5% to 31 +/- 9%) (p = 0.003). In the remaining 13 patients with nounal systolic function, fractional shortening decreased by 10% (from 40 +/- 5% to 36 +/- 6%) (p = 0.05). In conclusion, radiofrequency ablation of the atrioventricular junction ameliorates quality of life and physical performance; left ventricular systolic function improves in patients with depressed cardiac performance at initial evaluation.