AJ PHOTO / HOP. AMERICAIN / SCIENCE PHOTO LIBRARY AJ PHOTO / HOP. AMERICAIN / SCIENCE PHOTO LIBRARY
ECG readout. Printed readout from an electrocardiography (ECG) machine in a hospital's intensive care unit (ICU). ECG measures the electrical signals from different parts of the heart during its rhythmic beating. It is an important diagnostic tool, as any lack of rhythm or unusual waveform can be used to diagnose a heart condition.
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