Hi. I presume you mean clogged arteries. There are several treatment strategies. First is medical management, although this is usually reserved for people with mild disease or elderly people with multiple medical problems for which intervention is too risky. Angioplasty with stents are a possibility. This usually works for single vessel disease. Typically for people in your dad s age range w multiple blockages, blockage of the L main artery, or diabetic patients open heart surgery (CABG) coronary artery bypass grafting is usually the preferred option, especially if there is decreased heart function (systolic dysfunction or low ejection fraction). I am an internist but do a lot of work on the cardiac floors w experienced cardiologists and cardiothoracic surgeons. Hope this helps.