What Is The Life Expectancy Of A Patient With 10% Heart Function?

my uncle just had brain surgery about three weeks ago the removed a huge cancerous tumor which if he didnt have surgery they gave him six weeks to live. today he was taken back to hospital and they said he had a heart attack and flew him to a better hospital which on arrival took him straight into surgery and put a stint and a balloon and said he only has may 10 percent of his heart working.... he is 61 not in good health. what are the chances of him making it through this and doing chemo and radiation succesfully?