It looks like you’re asking about a STRESS Thallium Scan (often called a Thallium Stress Test). This is a nuclear imaging test used to evaluate blood flow to the heart both at rest and under stress. It helps detect coronary artery disease (CAD), assess heart function, and guide treatment decisions.
Details of a Stress Thallium Scan
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Purpose
- Detects blocked or narrowed arteries (ischemia).
- Evaluates heart function after a heart attack.
- Assesses blood flow before/after procedures like angioplasty or bypass surgery.
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Procedure
- Preparation: Avoid caffeine, smoking, and certain medications as instructed by your doctor.
- Resting Phase: A small amount of radioactive thallium (or sestamibi) is injected into a vein. A gamma camera takes images of blood flow in the heart at rest.
- Stress Phase: You will either exercise on a treadmill or receive a medication (dobutamine, adenosine, or dipyridamole) to mimic exercise.
- Second Injection: More thallium is injected, and images are taken again to compare blood flow during stress vs. rest.
- Completion: The test usually takes 2-4 hours.
Precautions for a Thallium Stress Test
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Before the Test
- Fasting: No eating/drinking for 4-6 hours before the test.
- Medications: Follow doctor’s instructions about stopping beta-blockers, calcium channel blockers, or nitrates.
- Avoid caffeine & nicotine for at least 24 hours before the test (they can interfere with results).
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During the Test
- Report chest pain, dizziness, or shortness of breath immediately.
- If using a treadmill, wear comfortable clothing and shoes.
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After the Test
- Drink plenty of water to flush out the radioactive material.
- Avoid close contact with pregnant women or young children for a few hours.
- Mild fatigue or headache may occur but usually resolves quickly.
