Inclusion Criteria:  We will include pediatric patients ( 1- 16) years old undergoing surgical correction for congenital acyanotic cardiac lesions needing cardiopulmonary bypass machine.  Exclusion Criteria:  1) Cyanotic heart disease. 2) Closed cardiac surgeries. 3) Previous cardiac surgery. 4) Patients suffering neurological illness. 5) Diabetics. 6) Emergency procedures. 7) Patients on preoperative steroid therapy. 8) Adult patients with congenital heart disease.