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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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).