Shilo,
Couple of years ago went through a whole mess of tests for my heart. Tread mill, cath etc. Bottom line is that I had less than 20% blockage anywhere. They gave me the old 'for your age you're in good shape' line. My brother in law is a GP and he sent me for all this stuff and he put me on blood pressure and cholesterol meds (mild doses). I only had a problem with the BP when I had been on the tread mill for about 25 minutes and they were busting my butt. He explained it to me that since I had a history of heart problems in my family, my father, and although my cholesterol was always around 180 or so, he wanted to keep my cholesterol down to about 125 so nothing would start. Sometimes that stuff is preventative. The hardest part in all this is finding a doctor that you trust. If you still have trouble or don't get what you need look into the Vanderbilt doctors. They now have one of the best heart facilities in the world.
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A day late, a dollar short and two drinks behind.