preejection period

pre·e·jec·tion pe·ri·od

the interval between onset of QRS complex and cardiac ejection; electromechanical systole minus ejection time.

preejection period

Cardiac pacing The interval between electrical initiation of systole and first flow of blood through pulmonic or aortic valves. See Ejection fraction.
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Pregnant women (N = 156) completed self-report mindfulness and emotional distress questionnaires, and had their autonomic function assessed in their first and third trimesters, including heart rate (HR), indices of heart rate variability (HRV), preejection period (PEP), and systolic (SBP) and diastolic blood pressure (DBP).
Interventricular dyssynchrony (IVDys), represented by the preejection period difference between pulsed wave Doppler flow in the aorta and pulmonary artery, correlates with QRS duration and typically exceed 40ms in patients with wide QRS (18).
Cardiac preejection period (PEP), thought to reflect sympathetic activation of the heart, and respiratory sinus arrythmia (RSA), thought to reflect vagal activity to the heart, were measured.