I had a heart attack in 93 which was in the widowmaker and I lost 20% of the back part of my heart, no procedures was done at that time,,The blood clot is inside the heart lodged on the widow maker where scar tissue formed after the attack, what caused them to go in this time was angina and shortness of breath, they done a cath and couldnt repair it at that time, all I know is it was explained as the branch where the left descending and the right descending arterys branch out, he couldnt get any