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[] Electrocardiography ( ECG or EKG ) is the process of recording the electrical activity of the over a period of time using placed over the skin. These electrodes detect the tiny electrical changes on the skin that arise from the 's pattern of and during each. It is very commonly performed to detect any cardiac problems. In a conventional 12-lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall of the heart's is then measured from twelve different angles ('leads') and is recorded over a period of time (usually ten seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the.
The graph of versus time produced by this medical procedure is an electrocardiogram. There are three main components to an ECG: the, which represents the depolarization of the atria; the, which represents the depolarization of the ventricles; and the, which represents the repolarization of the ventricles. A 12-lead ECG of a 26-year-old male with an incomplete The overall goal of performing an ECG is to obtain information about the structure and function of the heart. Medical uses for this information are varied and generally need knowledge of the structure and/or function of the heart to be interpreted. Some for performing an ECG include: • Suspected (heart attack) or • ST elevated myocardial infarction (STEMI) • non-ST elevated myocardial infarction (NSTEMI) • Suspected or • A,, a or other findings suggestive of a structural heart disease • Perceived either by pulse or • Monitoring of known cardiac arrhythmias • or collapse • • Monitoring the effects of a medication on the heart (e.g.
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An electrocardiograph with integrated display and keyboard on a wheeled cart An electrocardiograph is a machine that is used to perform electrocardiography, and produces the electrocardiogram. The first electrocardiographs are discussed later and are electrically primitive compared to today's machines. The fundamental component to an ECG is the, which is responsible for taking the between leads (see below) and amplifying the signal. ECG voltages measured across the body are on the order of hundreds of micro up to 1 millivolt (the small square on a standard ECG is 100 microvolts). This low voltage necessitates a low circuit and instrumentation amplifiers. Early ECGs were constructed with and the signal could drive a motor to print the signal on paper.