A. Prosthetic St. Jude's Regent Mechanical Heart Valve is shown with the 2 metallic leaflets in the “open” position. (Acknowledgement: Regent is a trademark of St. Jude Medical, Inc. Reprinted with permission of St. Jude Medical, copyright 2011. All rights reserved.) B. Three-dimensional transesophageal echocardiogram images obtained in a 15-year-old female showing a 23-mm prosthetic St. Jude's valve that was placed in the mitral position. The image is frozen during diastole, when the metallic leaflets are in the “open” position. Source: Chapter 8. Acyanotic Heart Disease: Valves, Outflow Tracts, and Vasculature, Pediatric Practice: Cardiology Citation: Gleason M, Rychik J, Shaddy R. Pediatric Practice: Cardiology; 2012 Available at: http://accesspediatrics.mhmedical.com/DownloadImage.aspx?image=/data/books/glea1/glea1_c008f010a.png&sec=41025105&BookID=525&ChapterSecID=41023848&imagename= Accessed: December 22, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved