From your description, he has coronary artery ectasia - dilated arteries. These sort of arteries do have a tendency to form clots. An aspirin a day is a reasonable treatment for this. He is at increased risk of heart attacks in the future, so he should take any symptoms of a possible heart attack seriously. I hope this information is useful.
Information provided in the heart forum is for general purposes only.
Only your physician can provided specific diagnoses and therapies. Feel free to write back with further questions. The Heart Center website contains a directory of the cardiology staff that can be used to select the physician best suited to address your cardiac problem. Information contained within this forum is intended solely for general educational purposes and is not intended nor implied to be a substitute for professional medical advice relative to your specific medical condition or question. Only your physician can provide specific diagnoses and therapies.