Like the "resting" echocardiogram," the "stress" echocardiogram uses sound waves to produce an image of your heart. However, during this procedure, information is collected before and after exercise. First, the baseline ultrasound examination is conducted while you lie on an examination table or bed. Your heart is examined using the ultrasound transducer and images are stored on videotape. An ECG is also performed at the same time.

Then you are put through increasing levels of physical exertion using a treadmill or stationary bicycle. As with any exercise test, be sure to tell your doctor if you experience any discomfort or other symptoms during the exercise. After exercise, the ultrasound examination is repeated to evaluate any changes in the efficiency of the heart muscle and valves at the higher heart rate that comes with exertion. This also enables the doctor to evaluate the adequacy of blood supply to the heart muscle from the coronary arteries, which provide the heart’s own blood supply.

Some preparation will be required before an exercise echocardiogram. Be sure to ask questions if you are uncertain about any of the following:

• You should not eat or drink anything for three hours prior to the test. This is only to reduce the potential for nausea during exercise.

• Also, your doctor may want you to stop taking certain medications for a period of time before the test -- be sure to ask your doctor about these special instructions and don’t stop taking any medications without your doctor’s instructions.

• On the day of the test wear comfortable clothing that is suitable for exercise and that will allow the ECG electrodes to be placed. Remember that a gel will be used for both the ECG and the ultrasound, so many people prefer to wear an examination gown. Also, wear comfortable shoes.

• A consent form is signed before the test begins. Be sure to ask any questions you may have.