im enquiring about a loved one, one year ago he went for a routine op and it was discovered he had had a heart attack and not known, i thought it was being taken care of he had stents and stuff in but three weeks ago during an angiogram he had heart failure and died, i have now heard later that only 4% of his heart was doing what it was supposed to do , i want to know if he would have known he didnt have long and how come he still seemed ok on that small percentage??