Blocked Artery More Condition_symptoms What Happens To You When You Have A Blocked Artery?

What happens to you when you have a blocked artery? - blocked artery more condition_symptoms

I just found out that my uncle is, he has three blocked arteries, and 1 of them about 50%, not the) other, about 80% (the other know. He is in hospital and now she is in surgery today at some point. My basic question is: What is the best and the worst thing that could happen to him, and what is more likely that could happen to him?