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Quick Learning ECG Online

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Electrocardiography (ECG)


Electrocardiography is the most commonly used test for evaluating cardiac status, graphically records the electrical current (electrical potential) generated by the heart. This current radiates from the heart in all directions and, on reaching the skin, is measured by electrodes connected to an amplier and strip chart recorder. The standard resting ECG uses five electrodes to measure the electrical potential from 12 different leads; the standard limb leads (I,II,III), the augmented limb leads (aVf, aVL, and aVr), and the precordial, or chest, leads (V1 through V6).