my friend is male, 58 yrs. Had a heart attack 3 yrs ago and had a bypass. He had a mild heart attack last month no bypass.Today at his check up his cardio. dr. said that he has an 80% blockage in 4 artries not counting the ones bypassed 3yrs ago.These blockages are in places where there is a 75% chance that an operation would kill him, according to the dr. The dr said that my friend is a walking time bomb, gave him 6-8 months and added that stress, strain, physcial exertion could cause it to happen quicker.I know diet and exercise are very important in keeping a healthy heart.Is there ANYTHING my friend can do except wait?