Determinants of hospital variability in perioperative red blood cell transfusions during coronary artery bypass graft surgery

The authors conducted an observational study of 22,272 patients undergoing coronary artery bypass grafting across 43 centers. Iterative modeling approaches were used to evaluate the contribution of patient and intraoperative factors on explain hospital-level transfusion rates. The majority of center-level variation could not be explained through the patient and intraoperative factors.