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Dobutamine MIBI Scanning

This appointment takes 3-4 hours.

Dobutamine is a medication that increases heart rate in a similar manner to exercise. The drug is given as an intravenous infusion over a period of 12-15 minutes. On occasions another medication called Atropine is give as an injection in order to achieve the appropriate heart rate.

  • This test is performed in patients who are asthamtic or who arrive in the clinic having had some form of caffeine in the past 24 hours.
  • No food or fluid for 4 hours before the test.
  • You will have an intravenous injection of radioactive tracer and a heart scan 40-60 minutes later.
  • An intravenous line will then be inserted after the first heart scan.
  • Following the Dobutamine infusion you will have a second intravenous injection of radioactive tracer and a heart scan 40-60 minutes later.
  • No caffeine for 24 hours before the test. This includes, coffee, tea, pop drinks, energy drinks, chocolate, Tylenol #1, #2 and #3. No decaffeinated drinks.
  • Bring something to eat and drink with you. There is a fridge for storage. Eating after injection of radiotracer improves the images.
  • No oral or topical nitrates on the day of the test.
  • Beta-blockers and calcium blocker may be stopped 48 hours before the test. Check with the Doctor who ordered the test.