Strict versus liberal target range for perioperative glucose in patients undergoing coronary artery bypass grafting: A prospective randomized controlled trial

Objective: The purpose of this study was to test the hypothesis that a liberal blood glucose strategy (121-180 mg/dL) is not inferior to a strict blood glucose strategy (90-120 mg/dL) for outcomes in patients after first-time isolated coronary artery bypass grafting and is superior for glucose control and target blood glucose management. Methods: A total of 189 patients undergoing coronary artery bypass grafting were investigated in this prospective randomized study to compare 2 glucose control strategies on patient perioperative outcomes. Three methods of analyses (intention to treat, completer, and per protocol) were conducted. Observed power was robust (>80%) for significant results. Results: The groups were similar on preoperative hemoglobin A(1c) and number of diabetic patients. The liberal group was found to be noninferior to the strict group for perioperative complications and superior on glucose control and target range management. The liberal group had significantly fewer patients with hypoglycemic events (<60 mg/dL; P<.001), but severe hypoglycemic events (<40 mg/dL) were rare and no group differences were found (P = .23). These results were found with all 3 methods of analysis except for blood glucose variability, maximum blood glucose, and perioperative atrial fibrillation. Conclusions: This study demonstrated that maintenance of blood glucose in a liberal range after coronary artery bypass grafting led to similar outcomes compared with a strict target range and was superior in glucose control and target range management. On the basis of the results of this study, a target blood glucose range of 121 to 180 mg/dL is recommended for patients after coronary artery bypass grafting as advocated by the Society of Thoracic Surgeons. (J Thorac Cardiovasc Surg 2012; 143:318-25)