My father, 81 yr old generally good health (5'10" 165lbs), had chest pains and nausea. After taking aspirin, he was taken immediately to hospital and stint was placed due to 70 to 90% blockage in an artery, then released the following day. Report says no heart damage. Now, is that considered a "heart attack" or something else if there is no damage? Also, can he resume normal activity, like driving?