Transmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility

Myocardial supply changes to accommodate the variation of myocardial demand across the heart wall to maintain normal cardiac function. A computational framework that couples the systemic circulation of a left ventricular (LV) finite element model and coronary perfusion in a closed loop is developed...

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Autores principales:	Lei Fan, Ravi Namani, Jenny S. Choy, Ghassan S. Kassab, Lik Chuan Lee
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	coronary flow cardiac work cardiac mechanics myocardial work density-perfusion mismatch computational modeling Physiology QP1-981
Acceso en línea:	https://doaj.org/article/ef10d2fbc275459a9881a8075a4d259d
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spelling	oai:doaj.org-article:ef10d2fbc275459a9881a8075a4d259d2021-11-30T19:18:03ZTransmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility1664-042X10.3389/fphys.2021.744855https://doaj.org/article/ef10d2fbc275459a9881a8075a4d259d2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fphys.2021.744855/fullhttps://doaj.org/toc/1664-042XMyocardial supply changes to accommodate the variation of myocardial demand across the heart wall to maintain normal cardiac function. A computational framework that couples the systemic circulation of a left ventricular (LV) finite element model and coronary perfusion in a closed loop is developed to investigate the transmural distribution of the myocardial demand (work density) and supply (perfusion) ratio. Calibrated and validated against measurements of LV mechanics and coronary perfusion, the model is applied to investigate changes in the transmural distribution of passive coronary perfusion, myocardial work density, and their ratio in response to changes in LV contractility, preload, afterload, wall thickness, and cavity volume. The model predicts the following: (1) Total passive coronary flow varies from a minimum value at the endocardium to a maximum value at the epicardium transmurally that is consistent with the transmural distribution of IMP; (2) Total passive coronary flow at different transmural locations is increased with an increase in either contractility, afterload, or preload of the LV, whereas is reduced with an increase in wall thickness or cavity volume; (3) Myocardial work density at different transmural locations is increased transmurally with an increase in either contractility, afterload, preload or cavity volume of the LV, but is reduced with an increase in wall thickness; (4) Myocardial work density-perfusion mismatch ratio at different transmural locations is increased with an increase in contractility, preload, wall thickness or cavity volume of the LV, and the ratio is higher at the endocardium than the epicardium. These results suggest that an increase in either contractility, preload, wall thickness, or cavity volume of the LV can increase the vulnerability of the subendocardial region to ischemia.Lei FanRavi NamaniJenny S. ChoyGhassan S. KassabLik Chuan LeeFrontiers Media S.A.articlecoronary flowcardiac workcardiac mechanicsmyocardial work density-perfusion mismatchcomputational modelingPhysiologyQP1-981ENFrontiers in Physiology, Vol 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	coronary flow cardiac work cardiac mechanics myocardial work density-perfusion mismatch computational modeling Physiology QP1-981
spellingShingle	coronary flow cardiac work cardiac mechanics myocardial work density-perfusion mismatch computational modeling Physiology QP1-981 Lei Fan Ravi Namani Jenny S. Choy Ghassan S. Kassab Lik Chuan Lee Transmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility
description	Myocardial supply changes to accommodate the variation of myocardial demand across the heart wall to maintain normal cardiac function. A computational framework that couples the systemic circulation of a left ventricular (LV) finite element model and coronary perfusion in a closed loop is developed to investigate the transmural distribution of the myocardial demand (work density) and supply (perfusion) ratio. Calibrated and validated against measurements of LV mechanics and coronary perfusion, the model is applied to investigate changes in the transmural distribution of passive coronary perfusion, myocardial work density, and their ratio in response to changes in LV contractility, preload, afterload, wall thickness, and cavity volume. The model predicts the following: (1) Total passive coronary flow varies from a minimum value at the endocardium to a maximum value at the epicardium transmurally that is consistent with the transmural distribution of IMP; (2) Total passive coronary flow at different transmural locations is increased with an increase in either contractility, afterload, or preload of the LV, whereas is reduced with an increase in wall thickness or cavity volume; (3) Myocardial work density at different transmural locations is increased transmurally with an increase in either contractility, afterload, preload or cavity volume of the LV, but is reduced with an increase in wall thickness; (4) Myocardial work density-perfusion mismatch ratio at different transmural locations is increased with an increase in contractility, preload, wall thickness or cavity volume of the LV, and the ratio is higher at the endocardium than the epicardium. These results suggest that an increase in either contractility, preload, wall thickness, or cavity volume of the LV can increase the vulnerability of the subendocardial region to ischemia.
format	article
author	Lei Fan Ravi Namani Jenny S. Choy Ghassan S. Kassab Lik Chuan Lee
author_facet	Lei Fan Ravi Namani Jenny S. Choy Ghassan S. Kassab Lik Chuan Lee
author_sort	Lei Fan
title	Transmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility
title_short	Transmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility
title_full	Transmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility
title_fullStr	Transmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility
title_full_unstemmed	Transmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility
title_sort	transmural distribution of coronary perfusion and myocardial work density due to alterations in ventricular loading, geometry and contractility
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/ef10d2fbc275459a9881a8075a4d259d
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Transmural Distribution of Coronary Perfusion and Myocardial Work Density Due to Alterations in Ventricular Loading, Geometry and Contractility

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