Amiodarone has been demonstrated to be the most effective drug in maintaining sinus rhythm. Differences in outcomes between the anti-antiarrhythmic drugs were reported, with sotalol and possibly amiodarone increasing mortality and dronedarone possibly decreasing the incidence of serious adverse events and proarrhythmia.

Background: A variety of antiarrhythmic drugs have been used to prevent recurrence of atrial fibrillation after conversion to sinus rhythm. We performed a systematic review to determine the effect of long-term treatment with those drugs on death, embolisms, adverse effects, and atrial fibrillation recurrence.Methods: We searched MEDLINE, EMBASE, the Cochrane Library (all up to May 2005), and the reference lists of retrieved articles. We included randomized controlled trials that compared any antiarrhythmic against control (placebo or no treatment) or another antiarrhythmic, for more than 6 months. Postoperative atrial fibrillation was excluded. Two evaluators independently reviewed the retrieved studies and extracted all data. Disagreements were resolved by discussion. All results were calculated at 1 year of follow-up.Results: Forty-four trials were included, with a total of 11 322 patients. Several class IA (disopyramide phos-phate, quinidine sulfate), class IC (flecainide acetate, propafenone hydrochloride), and class III (amiodarone, dofetilide, sotalol hydrochloride) drugs significantly reduced recurrence of atrial fibrillation (number needed to treat, 2-9), but all increased withdrawals due to adverse effects (number needed to harm [NNH], 9-27) and all but amiodarone and propafenone increased proarrhythmia (NNH,. Class IA drugs, pooled, were associated with increased mortality compared with controls (Peto odds ratio, 2.39; 95% confidence interval, 1. P=.04; NNH, 109). No other antiarrhythmic showed a significant effect on mortality compared with controls. We could not analyze other outcomes because data were lacking. Conclusion:Class IA, IC, and III drugs are effective in maintaining sinus rhythm but increase adverse effects, and class IA drugs may increase mortality.

BackgroundAtrial fibrillation is the most frequent sustained arrhythmia. Atrial fibrillation frequently recurs after restoration of normal sinus rhythm. Antiarrhythmic drugs have been widely used to prevent recurrence, but the effect of these drugs on all-cause mortality and other clinical outcomes is unclear. This is an update of a review previously published in 2007, 2012 and 2015. risk of mortality was higher in people taking quinidine, although the confidence interval also includes the possibility of no difference (RR 2.01, 95% CI 0.84 to 4.77; participants = 1646).No effect on mortality was apparent with the remaining drugs studied, but less data was available for them and it could be underpowered to detect small increases in mortality. In particular, very few data was available for flecainide (no death reported in any treatment arm in 4 RCTs studying flecainide, participants = 511) and propafenone (only 2 deaths reported in 5 included RCTs, participants = 998).

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BackgroundAtrial fibrillation is the most frequent sustained arrhythmia. Atrial fibrillation frequently recurs after restoration of normal sinus rhythm. Antiarrhythmic drugs have been widely used to prevent recurrence, but the effect of these drugs on all-cause mortality and other clinical outcomes is unclear. This is an update of a review previously published in 2007, 2012 and 2015. risk of mortality was higher in people taking quinidine, although the confidence interval also includes the possibility of no difference (RR 2.01, 95% CI 0.84 to 4.77; participants = 1646).No effect on mortality was apparent with the remaining drugs studied, but less data was available for them and it could be underpowered to detect small increases in mortality. In particular, very few data was available for flecainide (no death reported in any treatment arm in 4 RCTs studying flecainide, participants = 511) and propafenone (only 2 deaths reported in 5 included RCTs, participants = 998).