Measurement and interpretation of cardiac electrical activity using body-surface electrodes. The resulting trace is an electrocardiogram; waveform timing reflects the coordinated activation and recovery of cardiac tissue.
A recording of time-varying electrical potential differences at the body surface due to cardiac electrical activity. Its QT interval spans ventricular depolarization and repolarization; a prolonged QT interval need not specify a unique underlying channel defect.
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Electrocardiography (ECG or EKG) is a medical diagnostic tool that records the electrical activity of the heart over a period of time. It involves placing electrodes on the skin to detect the heart's electrical signals, which are then displayed as wavy lines on a graph. This visual representation provides valuable information about the heart's rhythm, size, and position, as well as potential abnormalities in the heart's electrical conduction system.