The QT interval is a measurement on an electrocardiogram (ECG) that represents the time taken for the heart's ventricles to depolarize and repolarize, which occurs between the start of the Q wave and the end of the T wave. This interval is crucial as it reflects the electrical activity of the heart, specifically how long it takes for the ventricles to reset after each heartbeat. An abnormal QT interval can indicate potential heart problems, making it a key parameter in assessing cardiac health.
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