MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Heart fitness test. Doctor showing test results to a patient riding an exercise bike during an assessment of his cardiovascular system. The patient 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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