Safety of long-term flecainide and propafenone in the management of patients with symptomatic paroxysmal atrial fibrillation: report from the Flecainide and Propafenone Italian Study Investigators

The American Journal of Cardiology
M ChimientiG Casadei

Abstract

To compare the relative safety of flecainide acetate to propafenone HCl during long-term treatment (12 months), we conducted a randomized, open-label, comparative, parallel, multicenter trial in 200 patients with paroxysmal atrial fibrillation (AF) and no history of heart disease. Initial daily doses were flecainide 200 mg (n = 97) or propafenone 450 mg (n = 103). Dose escalations up to a maximum of flecainide 300 mg/day or propafenone 900 mg/day were permitted after > or = 2 attacks of paroxysmal AF. Patients were assessed for safety and drug tolerance at designated intervals over the 12-month study unless discontinued for adverse experience or inadequate response. Ten patients on flecainide reported 14 cardiac adverse experiences; 4 discontinued the drug. Seven propafenone patients reported 8 cardiac adverse experiences; 5 discontinued the drug. Three proarrhythmic events occurred: 1 propafenone patient developed ventricular tachycardia and 2 flecainide patients experienced AF with a rapid ventricular response. An intention-to-treat analysis showed that the probability of safe and effective treatment after 12 months was 77% for flecainide-treated patients and 75% for the propafenone-treated patients. There was an acceptable r...Continue Reading

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