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Observational studies have suggested a benefit from additional arterial grafts in coronary-artery bypass grafting (CABG), but these findings have not been replicated in randomized controlled trials, most of which have been small and underpowered to detect differences in clinical outcomes. As a result, the cardiac surgical community has been reluctant to abandon the use of saphenous-vein bypass grafts. To address these issues, investigators analyzed data from the Radial Artery Database International Alliance, which pooled patient-level data from randomized controlled trials that had been designed to assess angiographic (i.e., not clinical) outcomes.
The analysis included 1036 CABG patients in five trials who were randomized between 1996 and 2…