Also called a "stress echo," this test combines an echocardiogram with an exercise test. It is useful in diagnosing coronary heart disease and other conditions. An echocardiogram is performed while the patient is resting. Then the patient exercises on a treadmill or stationary bicycle. After the exercise, a second echocardiogram is performed. The doctor compares the two echocardiograms and looks for changes in the way the heart functions during exercise. Changes can indicate coronary heart disease (blockages in the arteries that supply the blood to the heart muscle), or possibly other conditions of the heart.