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angiography X-ray of the blood vessels after injecting a contrast medium echocardiography a noninvasive diagnostic procedure that uses ultrasound to study to structure and motions of the heart cardiac catheterization A thin, flexible tube is guided into the heart via a vein or an artery electrocardiography diagnostic procedure consisting of recording the activity of the heart electronically with a cardiograph (and producing a cardiogram) Holter monitoring Device to monitor the heart for 24 hours with a portable electrocardiograph. coronary artery bypass grafting of a portion of a blood vessel from another part of the body