Inclusion Criteria:  Diabetic patients, type 2, who were admitted to hospital for cardiac surgery. Patient above 40 years old, Patients who need the usual insulin according to insulin dosing guidelines Patients with pre-operation glucose level > 200 mg/dL and < 300 mg/dL.  Exclusion Criteria:  Insulin sensitive patents (Age >70 years, Glomerular Filtration Rate (GFR) <45 ml/min, No history of Diabetes, Insulin resistance patients (Body Mass Index > 35 kg/m2, total daily insulin dose >80 units, Steroids > 20 mg prednisone daily, patients who at high risk of complications and or (those whom their operation was differed to be supervised by a specialized team). Patients who were unable to give written informed consent. Patients have ≥4 emergency admissions during the six months prior to the index admission.