 The Glucommander will be programmed to adjust the insulin drip to one of these two target groups. The nursing staff will not be blinded to treatment group allocation. The primary endpoint with be a composite of operative death, major adverse cardiac events MACE: death, myocardial infarction, re-vascularization, STS Defined Major Morbidity re-operation, Cerebrovascular accident, Deep Sternal Wound InfectionMediastinitis, Prolonged Ventilatory Support 24 hrs, Acute Renal Failure, and prolonged inotropic support. The pre-specified sub-group analysis will compare perioperative outcome of patients with diabetes vs non-diabetic patients. 