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The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction

Received: 12 October 2016     Accepted: 17 November 2017     Published: 13 December 2017
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Abstract

Ventricular torque magically pushes systolic ejection fraction, and such torsional moments originate in the Frenet frame of a curve of cardiac muscle. Since surgical treatments involve preoperative anatomy calculations of the cardiac muscle, the understanding of chamber geometric effects may guide left ventricular chamber-reduction surgery. We decomposed ejection fraction for an interpretation of geometric parameters in restoration and optimization of cardiac function. Three systolic geometric parameters--sphericity, contractility, ventricular torsion--were extracted for the ejection fraction from an epicardial view. The decomposing approach allowed us to estimate each factor’s contribution to the total ejection fraction with the exception of the myocardium-to-chamber volume ratio, which represented the thickening effect during systole. All other effects took parts in ‘shrinkage factor’ (β), which corresponded the ejection fraction with an infinitesimal layer of muscle. Through comparing parameters for left ventricular ejection fraction, geometrical rearrangement of muscle bands for ventricular torsion is the most effective mechanical axis during partial left ventriculectomy, while ventricular shape factor only plays a less important role during systole in dilated cardiomyopathy, which often misleads the surgeon’s assessment.

Published in European Journal of Clinical and Biomedical Sciences (Volume 3, Issue 6)
DOI 10.11648/j.ejcbs.20170306.15
Page(s) 129-133
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2017. Published by Science Publishing Group

Keywords

Systole, Dilated Cardiomyopathy, Ventricular Torsion, Ejection Fraction, Stroke Volume

References
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[2] Enzweiler CNH, Wiese TH, Lembcke AE, Hotz H, Kivelitz DE, et al. 2003. Effect of partial left ventriculectomy on left and right ventricular volumes and function as assessed with electron beam tomography: preliminary results. European Radiology 13: 1394-401.
[3] Assunção FB, de Oliveira DC, Souza VF, Nacif MS. 2016. Cardiac magnetic resonance imaging and computed tomography in ischemic cardiomyopathy: an update. Radiol Bras. 49(1):26-34.
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[5] Velagaleti RS, Gona P, Pencina MJ, Aragam J, Wang TJ, et al. 2014. Left ventricular hypertrophy patterns and incidence of heart failure with preserved versus reduced ejection fraction. Am J Cardiol. 113(1):117-22.
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  • APA Style

    Jijie Zhou. (2017). The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction. European Journal of Clinical and Biomedical Sciences, 3(6), 129-133. https://doi.org/10.11648/j.ejcbs.20170306.15

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    ACS Style

    Jijie Zhou. The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction. Eur. J. Clin. Biomed. Sci. 2017, 3(6), 129-133. doi: 10.11648/j.ejcbs.20170306.15

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    AMA Style

    Jijie Zhou. The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction. Eur J Clin Biomed Sci. 2017;3(6):129-133. doi: 10.11648/j.ejcbs.20170306.15

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  • @article{10.11648/j.ejcbs.20170306.15,
      author = {Jijie Zhou},
      title = {The Separate Effects of Wall-Thickening and Epicardial Volume as Determinants of Left Ventricular Ejection Fraction},
      journal = {European Journal of Clinical and Biomedical Sciences},
      volume = {3},
      number = {6},
      pages = {129-133},
      doi = {10.11648/j.ejcbs.20170306.15},
      url = {https://doi.org/10.11648/j.ejcbs.20170306.15},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ejcbs.20170306.15},
      abstract = {Ventricular torque magically pushes systolic ejection fraction, and such torsional moments originate in the Frenet frame of a curve of cardiac muscle. Since surgical treatments involve preoperative anatomy calculations of the cardiac muscle, the understanding of chamber geometric effects may guide left ventricular chamber-reduction surgery. We decomposed ejection fraction for an interpretation of geometric parameters in restoration and optimization of cardiac function. Three systolic geometric parameters--sphericity, contractility, ventricular torsion--were extracted for the ejection fraction from an epicardial view. The decomposing approach allowed us to estimate each factor’s contribution to the total ejection fraction with the exception of the myocardium-to-chamber volume ratio, which represented the thickening effect during systole. All other effects took parts in ‘shrinkage factor’ (β), which corresponded the ejection fraction with an infinitesimal layer of muscle. Through comparing parameters for left ventricular ejection fraction, geometrical rearrangement of muscle bands for ventricular torsion is the most effective mechanical axis during partial left ventriculectomy, while ventricular shape factor only plays a less important role during systole in dilated cardiomyopathy, which often misleads the surgeon’s assessment.},
     year = {2017}
    }
    

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    T2  - European Journal of Clinical and Biomedical Sciences
    JF  - European Journal of Clinical and Biomedical Sciences
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    AB  - Ventricular torque magically pushes systolic ejection fraction, and such torsional moments originate in the Frenet frame of a curve of cardiac muscle. Since surgical treatments involve preoperative anatomy calculations of the cardiac muscle, the understanding of chamber geometric effects may guide left ventricular chamber-reduction surgery. We decomposed ejection fraction for an interpretation of geometric parameters in restoration and optimization of cardiac function. Three systolic geometric parameters--sphericity, contractility, ventricular torsion--were extracted for the ejection fraction from an epicardial view. The decomposing approach allowed us to estimate each factor’s contribution to the total ejection fraction with the exception of the myocardium-to-chamber volume ratio, which represented the thickening effect during systole. All other effects took parts in ‘shrinkage factor’ (β), which corresponded the ejection fraction with an infinitesimal layer of muscle. Through comparing parameters for left ventricular ejection fraction, geometrical rearrangement of muscle bands for ventricular torsion is the most effective mechanical axis during partial left ventriculectomy, while ventricular shape factor only plays a less important role during systole in dilated cardiomyopathy, which often misleads the surgeon’s assessment.
    VL  - 3
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Author Information
  • Shanghai Institute of Applied Mathematics and Mechanics, Shanghai, China

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