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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 only one lead at a time. The instrument may record signals from several ECG leads sequentially, either automatically or operator selected. Single-channel ECGs are used to diagnose cardiac abnormalities, determine the response to drug therapy, and reveal trends or changes in the heart function. The instruments are not intended for a real-time assessment of the electrocardiogram or other cardiac conditions
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