Cardiac stress test. Electrodes attached to a patient undergoing a cardiac stress test in the cardiology department of a hospital. ECG (electrocardiogram) traces showing the patient's heart rate can be seen on the screen. Cardiac stress tests can be used to diagnose coronary disease that may be missed when the patient is at rest or to determine safe levels of exercise for a heart disease patient. Photographed in Draguignan, France.
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