Cognitive decline refers to a condition in which intellectual abilities and memory seem impaired when the patient appears to have otherwise recovered from the surgery. It is a condition distinct from delirium or encephalopathy. Cognitive decline is common, and can be persist for months and years, following cardiac surgery. The reported incidence of cognitive decline after coronary artery bypass graft (CABG) has been reported as 53% at hospital discharge, 36% at 6 weeks and 42% at 5 years9. Elderly patient undergoing cardiac surgery are at increased risk for postoperative cognitive decline10. A strong relationship has been reported between cognitive decline and reduced quality of life following cardiac surgery11.