Hello... Your description is incomplete. As you wrote that your husband suffered form multiple heart attacks and Angiogram suggestive of LAD 100% block. But you did not mention regarding other two vessels. A heart has three main blood supply. Most of times 100% block produces collateral automatically according to time so in many cases the part of heart supplied by a perticular vessel is not dead totally but sometimes when sudden blockage occurred then it may be possible that affected muscle part will be die. But still heart can function through other two blood supplies. As you also mentioned regrading work function that is 25%. I think it will be Ejection fraction of heart. EF 25% is significantly low and patient should go under ventricular defibrillation. But in my opinion, there is noting like leaving your hop and it is like walking time bomb. You should go for proper medication and surgery and your husband can live his life perfectly. So don t worry so much.