Energy loss for evaluating heart valve performance

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Presentation transcript:

Energy loss for evaluating heart valve performance Cary W. Akins, MD, Brandon Travis, PhD, Ajit P. Yoganathan, PhD The Journal of Thoracic and Cardiovascular Surgery Volume 136, Issue 4, Pages 820-833 (October 2008) DOI: 10.1016/j.jtcvs.2007.12.059 Copyright © 2008 The American Association for Thoracic Surgery Terms and Conditions

Figure 1 Pressure-volume diagram of one cardiac cycle. The Journal of Thoracic and Cardiovascular Surgery 2008 136, 820-833DOI: (10.1016/j.jtcvs.2007.12.059) Copyright © 2008 The American Association for Thoracic Surgery Terms and Conditions

Figure 2 Flow velocity profile under laminar conditions (A) and turbulent conditions (B). The Journal of Thoracic and Cardiovascular Surgery 2008 136, 820-833DOI: (10.1016/j.jtcvs.2007.12.059) Copyright © 2008 The American Association for Thoracic Surgery Terms and Conditions

Figure 3 Turbulence resulting from interruption of laminar flow by an irregularity in a vessel wall. The Journal of Thoracic and Cardiovascular Surgery 2008 136, 820-833DOI: (10.1016/j.jtcvs.2007.12.059) Copyright © 2008 The American Association for Thoracic Surgery Terms and Conditions

Figure 4 Flow separation created by various shapes inserted into flow stream: A, spherical ball; B, teardrop; C, ball with lateral protrusions; D, disc. The Journal of Thoracic and Cardiovascular Surgery 2008 136, 820-833DOI: (10.1016/j.jtcvs.2007.12.059) Copyright © 2008 The American Association for Thoracic Surgery Terms and Conditions

Figure 5 Energy changes in schematic arterial stenosis: Energy changes per unit volume of blood (top) and schematic arterial stenosis (bottom). The Journal of Thoracic and Cardiovascular Surgery 2008 136, 820-833DOI: (10.1016/j.jtcvs.2007.12.059) Copyright © 2008 The American Association for Thoracic Surgery Terms and Conditions

Figure 6 Differences in effective orifice area depending on abrupt contraction (A) and gradual contraction (B). The Journal of Thoracic and Cardiovascular Surgery 2008 136, 820-833DOI: (10.1016/j.jtcvs.2007.12.059) Copyright © 2008 The American Association for Thoracic Surgery Terms and Conditions