Nuclear Medicine

What is a nuclear medicine treadmill stress test?

  • A nuclear treadmill stress test is similar to a standard treadmill stress test, but provides the doctor with additional information by using an isotope to evaluate coronary blood flow.
  • The test is performed in two phases with each phase lasting 30 to 60 minutes. You may be required to return the following day to complete the second phase of the test.
  • An intravenous (IV) line will be started in order to inject a very small dose of the isotope when you reach the peak of your exercise. The isotope is not harmful to your heart.
  • Electrodes are placed on the chest to record an electrocardiogram (ECG), which monitors the electrical activity of your heart.
  • Your cardiologist will have you exercise on the treadmill, gradually increasing the speed and incline. This may last for up to 15 minutes depending on your activity level.
  • During the exercise part of the test, the cardiologist will be looking for changes in your ECG pattern and any symptoms that you may experience.
  • The test will be stopped if you become too tired or have any symptoms such as chest pain, or when the doctor feels he has gathered the information he needs.
  • After the exercise part of the test is completed, a special camera will take pictures of the heart. This usually lasts 20 to 40 minutes. You will lie flat with both arms above your head. A second set of pictures may be required at a later time.
    • These pictures help to show the specific area of the heart that is not getting enough blood and oxygen.
    • The second set of pictures is taken at rest to help evaluate which area(s) of the heart has recovered but is still not getting enough blood and oxygen. An area that has not recovered may indicate scar tissue from a heart attack.

Why is a nuclear medicine stress test done?

This test will give the doctor the same information as a standard treadmill stress test, plus the following:

  • Which areas of the heart are not getting enough blood and oxygen
  • How quickly the heart recovers after exercise
  • Any irregular heart rhythms
  • Wheather the patient has had a heart attack in the past.

What preparation is needed?

  • You should have nothing to eat or drink except water for 4 hours prior to the test.
  • Do not smoke at least 4 hours prior to the test.
  • It is important for you to ask your doctor:
    • How to adjust your insulin and food intake prior to the test if you are diabetic.
    • Wheather you should take your regular medications the morning of the test: note that the patient must stop taking some medications 72 hours before the test for best results.
    • Do not apply any lotions, oils or powders to the chest area.
    • Wear comfortable clothing (shorts or pants with shirt or blouse) and walking or athletic shoes.

Please inform your doctor if you have asthma or use inhalers.

For more information, contact your healthcare provider or email cardiology@highlinemedical.org.