My father age is 56 and he smokes a lot. He had a heart attack on last Friday Angiography and Angioplastic was successful, 3 days after the first attack he was shifted in ward, while he was sleeping his heartbeat flow very fast and he was breathing very loudly then step by step his breath became slow then low and then his heart stoped working the doctors gave them electric shocks CPR continously for 10 to 15 minutes which became successful and he was back to life and he is finally now discharged but doctors are saying that his heart in only working 25% his 3 veins were blocked but 1 was successfully open so 2 of his vein are working and other both 1 is 30 to 40 percent and 1 is 80 % blocked I don t know what will be the next but I have heard that again operation is going to happen for main artery which is 80 percent blocked please help me, Is this very serious for him? can he survive? how many year average he can live? what can be the solution?