Explore Nuclear Heart Scan
Many nuclear medicine centers are located in hospitals. A doctor who has special training in nuclear heart scans—a cardiologist or radiologist—will oversee the test.
Cardiologists are doctors who specialize in diagnosing and treating heart problems. Radiologists are doctors who have special training in medical imaging techniques.
Before the test begins, the doctor or a technician will use a needle to insert an intravenous (IV) line into a vein in your arm. Through this IV line, he or she will put radioactive tracer into your bloodstream at the right time.
You also will have EKG (electrocardiogram) patches attached to your body to check your heart rate during the test. (An EKG is a simple test that detects and records the heart's electrical activity.)
If you're having an exercise stress test as part of your nuclear scan, you'll walk on a treadmill or pedal a stationary bike. During this time, you'll be attached to EKG and blood pressure monitors.
Your doctor will ask you to exercise until you're too tired to continue, short of breath, or having chest or leg pain. You can expect that your heart will beat faster, you'll breathe faster, your blood pressure will increase, and you'll sweat.
Tell your doctor if you have any chest, arm, or jaw pain or discomfort. Also, report any dizziness, light-headedness, or other unusual symptoms.
If you're unable to exercise, your doctor may give you medicine to increase your heart rate. This is called a pharmacological stress test. The medicine might make you feel anxious, sick, dizzy, or shaky for a short time. If the side effects are severe, your doctor may give you other medicine to relieve the symptoms.
Before the exercise or pharmacological stress test ends, the tracer is injected through the IV line.
The nuclear heart scan will start shortly after the stress test. You'll lie very still on a padded table.
The nuclear heart scan camera, called a gamma camera, is enclosed in metal housing. The camera can be put in several positions around your body as you lie on the padded table.
For some nuclear heart scans, the metal housing is shaped like a doughnut (with a hole in the middle). You lie on a table that slowly moves through the hole. A computer nearby or in another room collects pictures of your heart.
Usually, two sets of pictures are taken. One will be taken right after the stress test and the other will be taken after a period of rest. The pictures might be taken all in 1 day or over 2 days. Each set of pictures takes about 15–30 minutes.
Some people find it hard to stay in one position during the test. Others may feel anxious while lying in the doughnut-shaped scanner. The table may feel hard, and the room may feel chilly because of the air conditioning needed to maintain the machines.
Let your doctor or technician know how you're feeling during the test so he or she can respond as needed.
The NHLBI updates Health Topics articles on a biennial cycle based on a thorough review of research findings and new literature. The articles also are updated as needed if important new research is published. The date on each Health Topics article reflects when the content was originally posted or last revised.