CLINICAL STUDY: ELECTROPHYSIOLOGY
Single oral loading dose of propafenone for pharmacological cardioversion of recent-onset atrial fibrillation
Ijaz A. Khan, MDa
a Division of Cardiology, Department of Medicine, Creighton University School of Medicine, Omaha, Nebraska, USA
Manuscript received June 16, 2000;
revised manuscript received August 18, 2000,
accepted October 2, 2000.
Reprint requests and correspondence: Dr. Ijaz A. Khan, Creighton University, Cardiac Center, 3006 Webster Street, Omaha, Nebraska 68131-2044
ikhan{at}cardiac.creighton.edu
The efficacy and safety of the single dose oral loading regimen of propafenone for pharmacological cardioversion of recent-onset atrial fibrillation (AFib) was evaluated by analyzing the trials on the subject identified through a comprehensive literature search. Most of the trials used a single dose of 600 mg for oral loading. The success rates ranged from 56% to 83%, depending on the duration of AFib and follow-up after drug administration. The conversion time ranged from 110 ± 59 to 287 ± 352 min, depending on the duration of observation after drug administration. The single dose oral loading regimen of propafenone was significantly more efficacious than placebo in the first 8 h after administration but not at 24 h. Compared with the intravenous regimen, the oral regimen resulted in fewer conversions in the first 2 h, but both regimens were equally efficacious afterward. The oral propafenone regimen was as efficacious as the single dose oral loading regimen of flecainide but was superior to those of quinidine and amiodarone. The adverse effects reported were transient arrhythmia, reversible QRS-complex widening, transient hypotension and mild noncardiac side effects. The transient arrhythmias were chiefly at the time of conversion and included appearance of atrial flutter, bradycardia, pauses and junctional rhythm. No life-threatening proarrhythmic adverse effects were reported. The single oral loading dose of propafenone appears to be highly effective for conversion of recent-onset AFib, with a relatively rapid effect within 2 to 3 h and freedom from serious adverse effects.
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Abbreviations and Acronyms
| | AFib | = atrial fibrillation | | AFl | = atrial flutter | | SD | = standard deviation |
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