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  • Cardiographs designed for recording the variations of the electric potential caused by the electrical activity of the heart muscle, usually detected at the body surface. These instruments consist of a main unit that includes a recorder, signal processors, and detachable leads that are connected to disposable electrodes fixed on some anatomic points of the body at the distal tip. The electrodes and leads transmit the bioelectrical signals to the recorder, which is capable of reproducing their characteristics in an amplitude versus time graph (electrocardiogram). Electrocardiographs (ECG) are used to diagnose cardiac abnormalities, determine the response to drug therapy, and reveal trends or changes in the heart function. Electrocardiographs that measure and record only the signal from one channel at a time (i.e., single-channel ECG) and more accurate instruments appropriate to record signals from two or more leads simultaneously (i.e., multichannel ECGs) are available. Electrocardiographs are not intended for a real-time assessment of the electrocardiogram or other cardiac conditions.
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