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Electrocardiographs (ECGs) designed for recording the variations of the electric potential caused by the electrical activity of the heart muscle, usually detected at the body surface from two or more leads simultaneously. The instrument usually records several ECG signals automatically; permitting a simultaneous analysis of the electrocardiographic signals. Multichannel ECGs are used to diagnose cardiac abnormalities, determine the response to drug therapy, and reveal trends or changes in the heart function. Multichannel electrocardiographs are not intended for a real-time assessment of the electrocardiogram or other cardiac conditions; instruments that can perform computerized automated measuring and interpretation of the ECG are also available.
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