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Copyright © 2017 American Academy of Pediatrics. From: Heart Murmurs American Academy of Pediatrics Textbook of Pediatric Care, 2nd Edition, 2017 Figure Legend: Pressure time relationships of the left-sided heart chambers are illustrated during the normal cardiac cycle. AV, aortic valve; ECG, electrocardiogram; LA, left atrium; LV, left ventricle; mm Hg, millimeters of mercury; MV, mitral valve; S1, first heart sound; S2, second heart sound. (From Lilly LS. Pathophysiology of Heart Disease. 3rd ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2003. Used by permission.) Date of download: 10/23/2017 Copyright © 2017 American Academy of Pediatrics. All rights reserved.