A 60 year man had undergone cardiac bypass surgery 2 days back. Now he staed forgetting things and was not able to recall names and phone numbers of his relatives. What is the probable diagnosis?

C i.e. Cognitive dysfunction Post cardiac surgery delirium (similar to ICU syndrome) is fairly common disorder typically occurring after 24-48 hours of surgeryQ in fearful patients. It presents as cognitive dysfunction affecting information processin intellect, concentration retention, visuo-spatial organization and memoryQ.