Electrical changes in the heart

• ECG: Graph of the voltage changes that occur during the cardiac cycle. • Readings are taken by electrodes placed on the surface of the body. • Electrodes detect voltage changes caused by the electrical activity of the heart. • P wave = atrial excitation (atrial depolarization). • QRS wave ventricular excitation (ventricular depolarization plus atrial repolarization). • T wave = end of ventricular excitation (ventricular repolarization).

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