Risks associated with a coronary angiogram include injury to the catheterized artery, tears in the heart or artery, allergic reactions to the medications or dye used during the procedure and excessive bleeding, according to Mayo Clinic. However, major complications from this procedure are rare.
Other possible complications and risks from a coronary angiogram include infection, heart attack, stroke, irregular heart rhythms or kidney damage, reports Mayo Clinic. In addition, radiation exposure is a factor since X-rays are used during this diagnostic procedure.
Since angiograms are invasive procedures, they are usually performed after other noninvasive cardiac tests, such as stress tests, echocardiograms or electrocardiograms, have been used, according to Mayo Clinic.