I'm curious as to what kind of patient will need coronary angiography?

Coronary angiography: Coronary angiography is done to evaluate the coronary arteries, usually looking for narrowing or obstruction. This is usually done in patients who have symptoms or evidence of ischemia (poor blood flow to the heart muscle), who are suspected to have narrowing or obstruction based on history, clinical findings, risks, and at times other studies such as stress testing.