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The effect of statin treatment on ventricular arrhythmic complications is uncertain. We sought to test whether statins reduce the risk of ventricular tachyarrhythmia, cardiac arrest, and sudden cardiac death.We searched MEDLINE, EMBASE, and CENTRAL up to October 2010. Randomized controlled trials comparing statin with no statin or comparing intensive vs. standard dose statin, with more than 100 participants and at least 6-month follow-up were considered for inclusion and relevant unpublished data obtained from the investigators. Twenty-nine trials of statin vs. control (113 568 participants) were included in the main analyses. In these trials, statin therapy did not significantly reduce the risk of ventricular tachyarrhythmia [212 vs. 209; odds ratio (OR) = 1.02, 95% confidence interval (CI) 0.84-1.25, P = 0.87] or of cardiac arrest (82 vs. 78; OR = 1.05, 95% CI 0.76-1.45, P = 0.84), but was associated with a significant 10% reduction in sudden cardiac death (1131 vs. 1252; OR = 0.90; 95% CI 0.82-0.97, P = 0.01). This compared with a 22% reduction in the risk of other 'non-sudden' (mostly atherosclerotic) cardiac deaths (1235 vs. 1553; OR = 0.78, 95% CI 0.71-0.87, P < 0.001). Results were not materially altered by inclusion of eight trials (involving 41 452 participants) of intensive vs. standard dose statin regimens.Statins have a modest beneficial effect on sudden cardiac death. However, previous suggestions of a substantial protective effect on ventricular arrhythmic events could not be supported. |
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