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Untangling the bilateral versus single internal mammary coronary artery bypass grafting debate.

Numerous retrospective studies have previously shown that patients receiving bilateral internal mammary artery (BIMA) when undergoing coronary artery bypass grafting (CABG) have a better long-term survival than patients receiving single internal mammary artery (SIMA) (1-3). However, much less data is available with respect to the need for repeat revascularization in these groups.