My father 57 years  had a heart attack 4 year back and after a month of he had angioplasty for 3 stent and since then he is on medication. Aspirin, clopidrogel and medicine for high blood pressure. No history of smoking or drinking. We take ecg, echo test every year. And treadmill test. How to confirm that re blocking is not recurring. And is there any confirm test to check re blocking.