Experiencing pain in your left arm or chest could be a sign of underlying heart problems. If such symptoms occur, doctors may recommend that you undergo an angiography. Angiography is a test that determines whether or not a coronary artery is blocked. If you have unstable angina, atypical chest pain, aortic stenosis, or unexplained heart failure, your doctor may be concerned that you’re at risk for a heart attack.   An angiogram is a test that uses