|Outcomes at 1–30 days||Number of trials (n)||Weighted event rates||RRR (95% CI)||NNT (CI)|
|*Abbreviations defined in glossary; weighted event rates, RRR, NNT, and CI calculated from data in article using a random effects model.|
|Supraventricular arrhythmia||16 (2029)||22%||31%||23% (7 to 37)||12 (8 to 22)|
|Ventricular arrhythmia||10 (1195)||5%||13%||51% (13 to 73)||13 (7 to 59)|
|Atrial fibrillation||12 (1649)||19%||28%||29% (7 to 45)||12 (8 to 27)|
Review: magnesium prophylaxis after cardiac surgery reduces the risk of arrhythmia and atrial fibrillation
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