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A Stress Echo, is a specialised ultrasound test to examine the effect of exercise on your heart. You will exercise on a treadmill to increase your heart rate while your doctor monitors your blood pressure and heart rhythm. When your heart rate reaches peak levels, your doctor will take ultrasound images of your heart to determine whether your heart muscles are getting enough blood and oxygen while you exercise. An imaging agent (safe and usually not felt) will be given to ensure the clearest pictures of your heart are obtained. It is important to let the technician know before the test if you have any known allergies or if you are pregnant or breast-feeding.