Intravenous flecainide versus verapamil for acute conversion of paroxysmal atrial fibrillation or flutter to sinus rhythm

The American Journal of Cardiology
M J SuttorpE G Mast

Abstract

In a single-blind randomized study, the efficacy of intravenous flecainide (2 mg/kg/10 minutes) versus verapamil (10 mg/1 minute) was assessed in 40 patients with paroxysmal atrial fibrillation (AF) or atrial flutter (AFI). The treatment was considered successful if sinus rhythm occurred within 1 hour. Of 20 patients receiving flecainide, 14 of 17 (82%) with AF converted to sinus rhythm, but in 3 patients with AFI flecainide failed. All patients treated with verapamil (17 AF, 3 AFI) showed lower ventricular rates after 1 hour; however, only 1 (6%) with AF converted to sinus rhythm and 1 (6%) converted to AFI. Patients who did not convert to sinus rhythm after treatment with verapamil were treated with flecainide and observed for another hour. After the change to flecainide, 9 of 15 patients (60%) with AF still converted. Thus, 23 of 32 patients (72%) with AF and none of 7 with AFI converted to sinus rhythm after treatment with flecainide. Conversion to sinus rhythm was achieved in 19 of 22 patients (86%) when AF lasted less than 24 hours and in 4 of 10 (40%) when the arrhythmia lasted greater than 24 hours. Transient adverse effects were noted in 10 patients (26%) after flecainide. In summary, flecainide is an effective and saf...Continue Reading

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