A nuclear stress test evaluates blood flow to the heart muscle during rest and stress. The test may involve walking on a treadmill or receiving medication that simulates exercise.
A small amount of radioactive tracer is used to create images of blood flow to the heart. The amount of radiation used is low and comparable to other commonly used medical imaging tests.
Persantine myocardial perfusion imaging may be used for patients unable to exercise adequately on a treadmill, patients with pacemakers, or patients with certain ECG abnormalities such as left bundle branch block.
Your test may be scheduled as either a one-day study or a two-day study depending on the imaging protocol.
Preparation Guide
Please review this checklist before coming to your appointment.
No Caffeine for 24 Hours
Avoid coffee, tea, chocolate, cola, energy drinks, and caffeine medications for 24 hours before your appointment.
Fasting Required
Do not eat for 4 hours before your appointment. For diabetic patients, the fasting period is 2 hours. Water is allowed. Bring a substantial, fatty meal, such as a sandwich or bagel, to eat after the injection when directed by staff.
Comfortable Clothing
Wear comfortable clothing and walking shoes suitable for treadmill exercise if required.
Bring Your Documents
Bring a list of your medications, your requisition form, and your health card.
What to Expect
Your visit may follow a one-day or two-day protocol depending on the imaging plan.
During the Exam
The test includes rest imaging, a stress portion using a treadmill or medication, and post-stress imaging. There may be waiting periods between stages while the tracer circulates.
One-Day vs Two-Day Testing
One-Day Protocol: Rest and stress scans on the same day, approximately 3 to 4 hours.
Two-Day Protocol: Day 1 rest imaging and Day 2 stress testing and imaging. Each visit usually takes 1 to 2 hours.
Caffeine can interfere with the stress medication and may require the test to be rescheduled. If you are unsure about any preparation instructions or were unable to follow them, please contact our clinic before your appointment.