“…15 Most were younger than 65 years, were men, had normal ejection fractions, and generally did not have greatly enlarged atria. 15,16 The duration of atrial fibrillation was 3 to 7 years, and the presence of structural heart disease was variable. 15,16 Because ablation to treat atrial fibrillation is a long procedure, generally 3 to 5 hours, 7,11,12 either moderate sedation or general anesthesia is used.…”