Northumberland Hills Hospital
1000 DePalma Drive. Cobourg, ON K9A 5W6
Booking line: 705-740-6888 Ext. 1



Appointment Date: ______________________               Time: _______________

This is a 2 part test.  The appointment time for the second set of images will be given to you on the day of the test.



·         Eat a light breakfast on the morning of the test.

·         No caffeine in any form (coffee, tea, chocolate or colas - including decaffeinated versions) for 24 hours prior to the test.

·         No medications containing caffeine (such as Tylenol #1, #2 and #3) for 24 hours prior to the test.

·         No smoking, nicorettes or nicotine patches for 12 hours prior to the test.

·         No Viagra, Levitra or Cialis for 24 hours prior to the test.

·         Bring a list of your medications with you on the day of the test.

·         PREGNANCY WARNING  -  If you are nursing, or think you may be pregnant please call the Nuclear Imaging lab at 745-9195 for instructions.

·         Some medications may interfere with this test – please ask your doctor if any of your usual medications need to be temporarily withheld prior to testing.


Stop:                                                                       (                           ) hrs. before test

You may restart these medications upon completion of the test




Thallium imaging is valuable for detecting or confirming the presence, extent and severity of coronary artery disease.



In preparation for the test, you will have ECG leads placed on your chest and an intravenous line will be started.  Your ECG and blood pressure will be monitored during your test.  To assess the coronary arteries, we compare images of your heart taken after a stress test, and again at rest.  The “stress test” is performed either by exercising on a treadmill or by giving a medication called persantine.


Exercise : You will walk on a treadmill which will increase in speed and elevation every 3 minutes. One minute before the treadmill is stopped the Thallium tracer will be given through your intravenous.  If you are scheduled for treadmill exercise you will need to wear comfortable shoes (no sandals or high heels) and comfortable shorts or pants.


Persantine :  Persantine is given through the intravenous line.  Following the administration of persantine, the thallium will be given through your intravenous. 


Thallium Imaging :  Thallium is a radioactive tracer which allows us to visualize the heart muscle with a special camera.  Thallium is not the “contrast dye” which is used for many x-ray imaging procedures such as CT scanning.  It is very uncommon to have any reaction to Thallium.  After the thallium injection, you will be taken to the nuclear imaging department where a series of images will be taken.  You will be required to lie on your back for approximately 15-20 minutes.  A reminder note with your return appointment details will be given to you by the Nuclear Imaging staff.  After several hours of free time, you return for the second set of images.



The thallium tracer is very expensive and it has a very limited shelf life.  It cannot be saved for use at a later date.  Also there is a long list of patients waiting to have this test.  Therefore, if you are unable to keep your appointment it is imperative that you call 705-740-6888 24 hours in advance so that we can book someone else in your place.  Similarly, it is important that you comply with the test preparation instructions so that we can perform your test.  Otherwise, we may cancel your test and you may be billed for the cost of the thallium tracer.