This isn't as straightforward as you might think... Checking for occlusion of coronary arteries is a reasonably involved process. https://en.wikipedia.org/wiki

This isn't as straightforward as you might think... Checking for occlusion of coronary arteries is a reasonably involved process. https://en.wikipedia.org/wiki/Coronary_catheterization https://en.wikipedia.org/wiki/Coronary_catheterization