Post-operative memory loss is a proven fact
A recent study (Journal of Behavior Medicine, 2012, 35, 557-568) provided memory training to patients recovering from coronary artery bypass surgery. They assessed cognition by neuropsychological evaluation one week, one month, three months and four months after surgery. About 65 percent of patients displayed memory deficits one month after surgery and 41 percent continued to have deficits after four weeks. - naplesnews.com