What are some alternative tests for heart blockages when routine tests come back normal?

Cardiac perfusion scans, echocardiograms and computerized tomography angiograms are some alternate tests for heart blockages, according to WebMD. A heart blockage, or coronary heart disease, occurs when plaque builds up in the arteries, and the narrowed arteries restrict blood flow to the heart, explains MyHeart.net.

During a cardiac perfusion scan, a physician injects a radioactive tracer into the patient’s bloodstream and uses a camera to detect areas of poor blood flow, states WebMD. An echocardiogram generates images of the heart using sound waves, and a computerized tomography angiogram takes an X-ray image of the heart and surrounding arteries, explains Mayo Clinic.