Cardiac Nuclear Imaging and Nuclear Stress Test

Cardiac nuclear imaging is a non-invasive diagnostic test that uses a small amount of radioactive material (tracers) and a special camera to create images of the heart. It allows physicians to see blood flow to the heart muscle, identify blockages, and detect heart muscle damage. It’s a safe, noninvasive tool used in both diagnosis and treatment monitoring. It is often combined with a stress test.

A nuclear stress test evaluates how well your heart performs at rest and under stress. It provides insight into how well blood and oxygen are reaching different areas of the heart. This helps identify coronary artery disease, determine the severity of known heart disease, and monitor recovery from cardiac events or procedures.

There are two parts:

1. Resting scan – Shows blood flow to the heart while at rest.
2. Stress scan – Performed after walking on a treadmill or receiving medication that increases heart rate or dilates blood vessels.

Images taken after each phase are compared to identify areas of reduced blood flow, helping diagnose blockages, prior heart attacks, or areas at risk for future events.

Cardiac nuclear imaging and nuclear stress tests are commonly used to evaluate symptoms such as chest pain, shortness of breath, or fatigue. They can be useful in diagnosing coronary artery disease and assessing severity and location of blockages. They may also be useful in guiding treatment decisions and evaluate heart function after a heart attack or cardiac procedure.

The procedure typically takes 2-4 hours and involves several steps. An IV line is placed and a small amount of radioactive tracer is injected into a vein. Images are taken using a special camera. You will then either be asked to walk on a treadmill or receive a medication to stimulate exercise. Another dose of tracer is given during peak stress/exercise and additional images are taken to assess blood flow under stress conditions.

The test is safe and painless, and radioactive material leaves the body naturally, typically within 24 hours. The amount of radiation is low and considered safe, but generally not recommended during pregnancy due to potential risk of radiation to unborn baby. Other risks include mild side effects from stress medications, such as flushing, dizziness, headache; rare allergic reactions to tracer; and, in rare cases, irregular heart rhythms or a heart attack triggered by the stress portion of the test. Your care team will closely monitor you throughout the procedure to ensure your safety.