systolic time intervals

systolic time intervals
(STI) any of several intervals measured for assessing left ventricular performance, particularly left ventricular ejection time (LVET), electromechanical systole (QS2), and preejection period (PEP); electrocardiography, phonocardiography, and carotid pulse tracings are used to determine LVET and QS2, and from them, PEP. See also individual intervals.

Medical dictionary. 2011.

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