Nuclear stress tests utilize radionuclide imaging (a radioactive dye) to further assess the presence or absence of blockages in your coronary system by looking at the way the blood flows through your arteries. There are two types of nuclear stress testing, exercise and chemical, and they both start the same way. You will be asked to sit or lie still while the camera will take a series of digital pictures to establish a baseline of your heart function as the dye moves through your system, illuminating the heart and its function, arteries and other important information.
Exercise Nuclear Stress Test
This type of nuclear stress test uses treadmill exercise to evaluate the heart’s response to exercise. You will be asked to walk on the treadmill until optimum stress levels are reached, and then move to the camera. The imaging obtained helps your provider determine if there is any reversible damage occurring to the heart (presence or absence of blockages). This type of stress test is normally used for those individuals who are able to walk on a treadmill without difficulties.
Chemical Nuclear Stress Test
This version of the nuclear stress test uses a medication (usually adenosine or Lexiscan) to induce the heart to respond as if the heart were exercising. The imaging obtained helps your provider determine if there is any reversible damage occurring to the heart (presence or absence of blockages). This type of stress test is normally used for individuals for whom walking on a treadmill is difficult or not possible.