A Cardiac Nuclear Scan is a test that uses a radioactive substance, known as an isotope, to produce images of the heart muscle. When combined with an exercise test, the scanning helps determine if areas of the heart are not receiving enough blood, which is especially useful in diagnosing blocked arteries of the heart.

How long does it take? Allow three to four hours for the entire test, which includes preparation, the exercise portion and imaging before and after exercise.

Dual-Isotope Imaging. In dual-isotope imaging, two isotopes are used. A rest study with Thallium or Myoview is done first, and a stress study with Cardiolite or Myoview follows soon after.

Your test results. You will be called within 48 hours. The test results help the doctor make an accurate diagnosis and develop a treatment plan that's best suited for you.

Is the test safe? The radiation exposure during a Nuclear Scan is small, and the doses used are safe. However, if you are pregnant, suspect you may be, or are a nursing mother, be sure to let your doctor know.

The exercise test is also safe. A small amount of risk does exist, however, because is stresses the heart.

Possible rare complications include abnormal heart rhythms, heart attack, etc. Experienced personnel are available to handle any emergency.