Effect of Transmural Differences in Excitation-Contraction Delay and Contraction Velocity on Left Ventricle Isovolumic Contraction: A Simulation Study
Joint Authors
Vaverka, J.
Burša, J.
Šumbera, J.
Pásek, Michal
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-05-10
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
Recent studies have shown that left ventricle (LV) exhibits considerable transmural differences in active mechanical properties induced by transmural differences in electrical activity, excitation-contraction coupling, and contractile properties of individual myocytes.
It was shown that the time between electrical and mechanical activation of myocytes (electromechanical delay: EMD) decreases from subendocardium to subepicardium and, on the contrary, the myocyte shortening velocity (MSV) increases in the same direction.
To investigate the physiological importance of this inhomogeneity, we developed a new finite element model of LV incorporating the observed transmural gradients in EMD and MSV.
Comparative simulations with the model showed that when EMD or MSV or both were set constant across the LV wall, the LV contractility during isovolumic contraction (IVC) decreased significantly (dp/dtmax was reduced by 2 to 38% and IVC was prolonged by 18 to 73%).
This was accompanied by an increase of transmural differences in wall stress.
These results suggest that the transmural differences in EMD and MSV play an important role in physiological contractility of LV by synchronising the contraction of individual layers of ventricular wall during the systole.
Reduction or enhancement of these differences may therefore impair the function of LV and contribute to heart failure.
American Psychological Association (APA)
Vaverka, J.& Burša, J.& Šumbera, J.& Pásek, Michal. 2018. Effect of Transmural Differences in Excitation-Contraction Delay and Contraction Velocity on Left Ventricle Isovolumic Contraction: A Simulation Study. BioMed Research International،Vol. 2018, no. 2018, pp.1-10.
https://search.emarefa.net/detail/BIM-1126914
Modern Language Association (MLA)
Vaverka, J.…[et al.]. Effect of Transmural Differences in Excitation-Contraction Delay and Contraction Velocity on Left Ventricle Isovolumic Contraction: A Simulation Study. BioMed Research International No. 2018 (2018), pp.1-10.
https://search.emarefa.net/detail/BIM-1126914
American Medical Association (AMA)
Vaverka, J.& Burša, J.& Šumbera, J.& Pásek, Michal. Effect of Transmural Differences in Excitation-Contraction Delay and Contraction Velocity on Left Ventricle Isovolumic Contraction: A Simulation Study. BioMed Research International. 2018. Vol. 2018, no. 2018, pp.1-10.
https://search.emarefa.net/detail/BIM-1126914
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1126914