QRST interval

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• QRST interval — Q–T interval in electrocardiography, the time from the beginning of the Q wave to the end of the T wave; it represents the duration of ventricular electrical activity. See also illustration at electrocardiogram …   Medical dictionary

• Systole — The time period when the heart is contracting. The period specifically during which the left ventricle of the heart contracts. The final letter in systole is pronounced as a long e as in lee. The adjective for systole is systolic. The systolic… …   Medical dictionary