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Benefits and risk of an angiogram. Arteries are muscles not a pipe. The inside lining of the arterial wall is all skin it is called the endothelium.
The best time to do an angiogram is when you have acute coronary syndrome or unstable angina.
There are many trials to show that doing an angiogram on a preventative basis may not be necessary and it then becomes important to treat the artery as a muscle vs stenting / bypassing stable coronary artery disease.
Angiogram are nice to see a plumbing problem but this is a 2 dimensional result vs understanding the composition and vulnerability of a plaque rupture.