Inclusion Criteria:  Patients of 40-60 years old Hemodynamically stable with normal or moderately impaired left ventricular function Ejection fraction >40% that underwent elective surgery CABG surgery for single vessel  Exclusion Criteria:  Hemodynamic instability intraoperative. Patients on moderate to high vasopressors or ionotropes. Ejection fraction less than 40%. Off pump surgery. Patient on mechanical supports.