MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Heart fitness test. Doctor using a stethoscope and arm cuff to measure a patient's blood pressure. The patient has just ridden an exercise bike during an assessment of his cardiovascular system. He is fitted with electrodes (round), which monitor the electrical activity of his beating heart. This test is used to diagnose arrhythmia (irregular heartbeat), and some forms of coronary artery disease.
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