tress test types in CHD diagnosis. Name and briefly describe them. - Stress electrocardiogram: Patient is connected to the ECG and then works out on a treadmill. The ECG measures the heart’s impulses before, during and after the exercise. Based on the heart’s reaction a diagnosis can be made. - Stress echocardiography: The echocardiography is performed both before and after the exercise so that structural differences can be compared. A resting echocardiogram is obtained prior to stress. The patient is subjected to stress by working out on a treadmill. After the target heart rate is achieved, 'stress' echocardiogram images are obtained. The two echocardiogram images are then compared to assess for any abnormalities in wall motion of the heart. This is used to detect obstructive coronary artery disease. - Nuclear stress test: The best known example of a nuclear stress test is myocardial perfusion imaging. Typically, a radiotracer may be injected during the test. After a suitable waiting period to ensure proper distribution of the radiotracer, scans are acquired with a gamma camera to capture images of the blood flow. Scans acquired before and after exercise are examined to assess the state of the coronary arteries of the patient. Showing the relative amounts of radioisotope within the heart muscle, the nuclear stress tests more accurately identify regional areas of reduced blood flow.

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