Thallium stress test is a nuclear imaging method that shows how well blood flows into the heart muscle, both at rest and during activity.
This test is done at a medical center or doctor’s office. It is done in stages:
You will have an IV (intravenous line) started.
Most people will then walk on a treadmill (or pedal on an exercise machine).
Your blood pressure and heart rhythm (ECG) will be watched throughout the test.
When your heart is working as hard as it can, a radioactive substance is again injected into one of your veins.
Your doctor will compare the first and second set of pictures using a computer. This can help your doctor tell if you have heart disease or if your heart disease is becoming worse.
You should wear comfortable clothes and shoes with non-skid soles. You may be asked not to eat or drink after midnight. You will be allowed to have a few sips of water if you need to take medicines.
You will need to avoid caffeine for 24 hours before the test. This includes:
Many medicines can interfere with blood test results.
During the treadmill test, some people feel:
If you are given the vasodilator drug, you may feel a sting as the medication is injected. This is followed by a feeling of warmth. Some people also have a headache, nausea, and a feeling that their heart is racing.
If you are given medicine to make your heart beat stronger and faster (dobutamine), you may have a headache, nausea, or your heart may pound more strongly.
Rarely, during the test people experience:
If any of these symptoms occur during your test, tell the person performing the test right away.
The test is done to see if your heart muscle is getting enough blood flow and oxygen when it is working hard (under stress).
Your doctor may order this test to find out:
The results of a nuclear stress test can help your doctor:
A normal result means blood flow through the coronary arteries is probably normal.
The meaning of your test results depends on the reason for the test, your age, and your history of heart and other medical problems.
Abnormal results may be due to:
After the test you may need:
Complications are rare, but may include:
Your health care provider will explain the risks before the test.
In some cases, other organs and structures can cause false positive results. However, special steps can be taken to avoid this problem.
You may need additional tests, such as cardiac catheterization, depending on your test results.
Sestamibi stress test; MIBI stress test; Myocardial perfusion scintigraphy; Dobutamine stress test; Persantine stress test; Thallium stress test; Stress test - nuclear; Adenosine stress test; Regadenoson stress test
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Updated by: Michael A. Chen, MD, PhD, Assistant Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, Washington Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.
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