Atrial fibrillation
Atrial fibrillation (AF) is a common cardiac rhythm disturbance associated with oxidative stress. Four meta-analyses have concluded that there is strong evidence that consuming 1–2 g/day of vitamin C before and after cardiac operations can decrease the risk of post-operative AF. However, five randomized studies did not find any such benefit in the United States, so that the benefit was restricted to less wealthy countries.