European Heart Journal Advance Access originally published online on March 31, 2009
European Heart Journal 2009 30(10):1245-1253; doi:10.1093/eurheartj/ehp100
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Amiodarone for the prevention of sudden cardiac death: a meta-analysis of randomized controlled trials
Division of Cardiology, Duke Clinical Research Institute, Duke University Medical Center #31115, Durham, NC 27710, USA
Received 10 October 2008; revised 14 January 2009; accepted 26 February 2009; online publish-ahead-of-print 31 March 2009.
* Corresponding author. Tel: +1 919 308 9861, Fax: +1 919 668 7058, Email: jonathan.piccini{at}duke.edu
Aims: Not all patients at risk for sudden cardiac death (SCD) are eligible for, or have access to implantable cardioverter defibrillator (ICD) implantation. There are conflicting data regarding the efficacy and safety of amiodarone for the prevention of SCD.
Methods and results: We conducted a meta-analysis of all randomized controlled trials examining the use of amiodarone vs. placebo/control for the prevention of SCD. We identified 15 trials, which randomized 8522 patients to amiodarone or placebo/control. Amiodarone decreased the incidence of SCD [7.1 vs. 9.7%; OR 0.71 (0.61–0.84), P < 0.001] and cardiovascular death (CVD) [14.0 vs. 16.3%; OR 0.82 (0.71–0.94), P = 0.004]. There was a 1.5% absolute risk reduction in all-cause mortality which did not meet statistical significance (P = 0.093). Amiodarone therapy increased the risk of pulmonary [2.9 vs. 1.5%; OR 1.97, (1.27–3.04), P = 0.002], and thyroid [3.6 vs. 0.4%; OR 5.68, (2.94–10.98), P < 0.001] toxicity.
Conclusion: Amiodarone reduces the risk of SCD by 29% and CVD by 18%, and therefore, represents a viable alternative in patients who are not eligible for or who do not have access to ICD therapy for the prevention of SCD. However, amiodarone therapy is neutral with respect to all-cause mortality and is associated with a two- and five-fold increased risk of pulmonary and thyroid toxicity.
Key Words: Amiodarone Sudden cardiac death Cardiomyopathy