Ejection fraction calculated using the disk summation method from 4-chamber end diastole (A), 2-chamber end diastole (B), 4-chamber end-systole (C), and.

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Date of download: 6/25/2016 Copyright © The American College of Cardiology. All rights reserved. From: Anatomically Oriented Right Ventricular Volume Measurements.
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Ejection fraction calculated using the disk summation method from 4-chamber end diastole (A), 2-chamber end diastole (B), 4-chamber end-systole (C), and 2-chamber end systole (D) tracings. E. Depiction of a single Simpson disk with elliptical diameters measured from midesophageal 4-chamber and 2-chamber views. Using the software package of the transesophageal echocardiography machines, the volume of each theoretical disk is automatically calculated separately in this way and then summed together to obtain the left ventricular volume in both end diastole and end systole, allowing for calculation of ejection fraction. Source: Chapter 31. Intraoperative Transesophageal Echocardiography: A Systematic Approach, Anesthesiology, 2e Citation: Longnecker DE, Brown DL, Newman MF, Zapol WM. Anesthesiology, 2e; 2012 Available at: http://accessanesthesiology.mhmedical.com/DownloadImage.aspx?image=/data/books/long2/long2_c031f009abcd.png&sec=40120007&BookID=490&ChapterSecID=40114716&imagename= Accessed: November 03, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved

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