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The purpose of the test is to assess the blood flow to the heart muscle at peak stress and again at rest. This test is used in people who are unable to exercise. In lieu of exercise on a treadmill, the medication Regadenoson is given, which acts to dilate the coronary arteries. Regadenoson is a naturally occurring substance produced by many tissues in your body. The test is given over two separate days. On one day, you will receive an infusion of Regadenoson and Cardiolite, which is referred to as the stress portion of the test, and on the other day, an infusion of Cardiolite only, which is referred to as the rest portion of the test.

Following are some frequently asked questions about the test and how to prepare for it. Click on the question for the answer, which will appear below the questions.



What will happen during the test?

Before the stress portion of the test, a small intravenous (IV) line will be started in a vein in your arm. The IV will allow us to inject the Regadenoson and Cardiolite into the bloodstream at the appropriate time. A blood pressure cuff will be placed around your other arm to monitor your blood pressure during the test. Electrodes will be placed on your chest to monitor your electrocardiogram throughout the test.

Regadenoson and Cardiolite will be injected while we monitor your blood pressure and electrocardiogram. Afterwards, we will ask you to eat a ‘fatty’ meal to help clear any medication from your stomach and colon as this would interfere with the imaging.

Approximately one hour later the pictures will be taken with a special camera. You will lie on your back with your arms above your head while the camera takes pictures of the blood flow to your heart from many different angles. The pictures are stored in digital form on a special computer.

On a separate day, the resting portion of the exam will be performed. Cardiolite will be injected directly into a vein while you are at rest. After you have been injected, you will need to eat a fatty meal. Approximately one hour later, a set of pictures of the blood flow to your heart will be recorded. After you leave the laboratory we will perform special computer processing of both sets of pictures to compare the blood flow pattern to your heart at stress and at rest.



What is the preparation for the stress portion of the test?

  • Wear loose, comfortable clothing and comfortable walking shoes.
  • Since your blood pressure will be checked periodically during the test, wear a short-sleeved shirt or blouse.
  • Do not wear boots, jumpsuits, overalls, or a dress.
  • Please do not eat or drink anything with caffeine in it for 24 hours before your stress test. Items with caffeine include sodas, ‘caffeine free’ sodas, coffee, decaf coffee, tea, decaf tea, chocolate, Excedrin and certain cold or diet pills.
  • Do not eat anything 4 hours prior to the stress test. If you are diabetic, follow your normal regimen but eat light. You may have juice before the test if needed.
  • Please do not smoke or exercise 8 hours before testing.
  • You should continue to take all medications, unless your cardiologist instructs you to do otherwise.


What is the preparation for the rest portion?

  • Please do not eat or drink anything with caffeine in it for 4 hour before your resting test. Items with caffeine include sodas, ‘caffeine free’ sodas, coffee, decaf coffee, tea, decaf tea, chocolate, Excedrin and certain cold or diet pills.
  • Do not eat anything 4 hours prior to the test. If you are diabetic, follow your normal regimen but eat light. You may have juice before the test if needed.
  • Please do not smoke or exercise 8 hours before testing.
  • If you routinely take any medications take them as prescribed.


What should I bring with me to the stress test?

  • Inhalers, if you use them.
  • List of medications and dosages.
  • Insurance card.
  • Referral for the stress test if required by your insurance company.


Where will the test be performed?

The test will be performed at:

BSW Legacy Heart Center
6601 Preston Road
Plano, Texas 75024
469-800-6300

It is very important that you keep your appointment once it is scheduled. If you must cancel your appointment, please give the office at least 24 hours notice by calling 469-800-6300. Our testing schedule requires tight time restrictions, so please notify the office immediately if you will be late for your appointment. We appreciate your complete cooperation.



What is the accuracy of the test results?

Cardiolite can increase the accuracy of traditional stress testing in detection of coronary artery disease.


Who will give me the results?

After a review of the test, your medical history, other imaging modalities and previous tests by a BSW ​Legacy Heart Center cardiologist, a report will be sent to the ordering physician. The ordering physician will then review the results and discuss them with you.