During exercise and at rest, nuclear stress tests evaluate blood flow to the heart. It helps identify areas of reduced blood flow to the heart muscle, which can indicate coronary artery disease (CAD) or other heart conditions. Radioactive tracer is administered and a special camera is used to create images of the heart during the test.
The following preparation guidelines should be followed by patients before undergoing a nuclear stress test:
The patient may be asked to avoid certain medications that can interfere with the test results, such as beta-blockers and calcium channel blockers. However, the patient should consult their healthcare provider before making any changes to their medication regimen.
For several hours before the test, patients are usually instructed not to eat or drink anything except water.
During the test, patients may be required to walk on a treadmill or pedal a stationary bike, so they should wear comfortable clothing and shoes.
Following are the steps involved in nuclear stress testing:
The patient receives an injection of a radioactive tracer, which is absorbed by the heart muscle. The heart is then photographed using a special camera, known as a gamma camera, while lying down.
Depending on the patient's ability to exercise, exercise stress testing or pharmacological stress testing may be performed after the resting images have been obtained. In pharmacological stress testing, patients receive medication that simulates the effects of exercise on the heart while walking on a treadmill or pedaling a stationary bike. In exercise stress testing, patients walk on a treadmill or pedal a stationary bike while their heart rate and blood pressure are monitored.
During the stress portion of the test, additional images of the heart are taken using the gamma camera to assess blood flow to the heart.
The nuclear stress test typically allows patients to resume normal activities immediately afterward. However, patients may be advised to drink plenty of fluids to help flush the radioactive tracer from their system. Patients should also follow any specific instructions regarding post-test care provided by their healthcare provider.
There are some potential risks associated with nuclear stress testing, including:
Rarely, patients may experience an allergic reaction to the radioactive tracer.
A nuclear stress test uses a small amount of radiation, and it is considered safe for most patients. However, pregnant women and nursing mothers should consult their healthcare provider before undergoing the test.
Following a nuclear stress test, patients may be advised to:
Drink plenty of fluids to help flush out the radioactive tracer as quickly as possible.
Unless otherwise instructed by their healthcare provider, patients should resume any medications they temporarily stopped before the test.
The patient should attend any follow-up appointments with their healthcare provider to discuss the results and any further recommendations.
