Hello and thanks for writing in at HCM
I am a jr. to Cardiologist. No their is no Heart attack
your father has suffered. The personality change may be age related or can be caused due to constant high blood pressure
. In my opinion consult with your Psychiatrist
and take a opinion from him. Also keep a check on Blood pressure, if it is constantly high than try to control it with proper medication. High blood pressure may cause stroke in the future.
Try to keep your father busy in some work in which he is interested and not let him feel that is a alone or has no work to do. Rest please follow the advises of your Psychiatrist.
Dr. Dinesh Kumar Bhatia
Health Care Magic