the interval between onset of QRS complex and cardiac ejection; electromechanical systole minus ejection time.
Farlex Partner Medical Dictionary © Farlex 2012
preejection periodCardiac pacing The interval between electrical initiation of systole and first flow of blood through pulmonic or aortic valves. See Ejection fraction.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.