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Test will make it up. not 100%. stress tests miss the problem and will sometimes you have it when you don't have it. >> what should you do tell you when you don't. there are other things you can do, we talked about calcium scoring, a c.t.angiogram. and it's a test that examines function. it's practical. saying hey, if you want to run a marathon, do it under circumstances where we can control it. >> and he deals with this a lot more, but it's good for what are the indications of a stress test. and if you have high cholesterol

Still have to constantly be concerned about their heart. >> well, that's why we have routine screening tests after the age of 50. a ct angiogram is not routine. but going in, getting on a treadmill, seeing how well your heart tolerates exercise, that's one thing. we do know you can reverse heart disease, especially in men, by a nonfat diet, exercising, not smoking. for a lot of people, being on statins. that's been proven. bill clinton is the poster child of having had a real cardiac scare, totally turning his lifestyle around and looking better than ever. >> what's the -- is it the stress tes...

One of his arteries. it was after a routine stress test as part of his annual physical exam when the former president doctor's ordered a ct angiogram and that confirmed the blockage in his artery. the stent is minimally invasive and a fairly common procedure. >> this is a stent. in this procedure, a catheter is inserted into an artery and into a person's leg. it has a balloon on there. the balloon opens up the blockage. they leave behind a wire stent, this little wire tube. >> reporter: a patient is usually able to do mild activity in a few days. since leaving the white house, bush has kept a ...

And an ultrasound of your heart can be done. it's noninvasion inand you can see how well the heart's pumping. a ct angiogram, not a screening test because, one, you'll absolutely find an abnormality and, two, there's a big radiation dose with that test. >> isn't it accurate to say the thallium stress test, where they inject the thallium dye into your heart? >> absolutely, the thallium stress test is one notch up where you get an injection of a radioactive tracer and they check out the injection fraction of your heart. it's the next step up, if they're concerned about heart function. >> you had...

This is a great reminder, doc, to get a physical. this was found during a routine physical. >> not only like that, 67-year-old man like, not an extra ounce of weight on him, i went biking with him two months ago on his ranch, over 60 miles over three days. we have navy seals had trouble keeping up with him. at the end of this he wasn't even out of breath. if anyone could have a blockage if he could. it didn't look like he was at risk for but it can happen to anyone. jenna: what did they find to say, hey, mr. president, we're going to need to do a little procedure here? why did they do it? >> h...