DocumentCode :
1293805
Title :
From Vascular Corrosion Cast to Electrical Analog Model for the Study of Human Liver Hemodynamics and Perfusion
Author :
Debbaut, Charlotte ; Monbaliu, Diethard ; Casteleyn, Christophe ; Cornillie, Pieter ; Van Loo, Denis ; Masschaele, Bert ; Pirenne, Jacques ; Simoens, Paul ; Van Hoorebeke, Luc ; Segers, Patrick
Author_Institution :
Inst. Biomed. Technol., Ghent Univ., Ghent, Belgium
Volume :
58
Issue :
1
fYear :
2011
Firstpage :
25
Lastpage :
35
Abstract :
Hypothermic machine perfusion (HMP) is experiencing a revival in organ preservation due to the limitations of static cold storage and the need for better preservation of expanded criteria donor organs. For livers, perfusion protocols are still poorly defined, and damage of sinusoidal endothelial cells and heterogeneous perfusion are concerns. In this study, an electrical model of the human liver blood circulation is developed to enlighten internal pressure and flow distributions during HMP. Detailed vascular data on two human livers, obtained by combining vascular corrosion casting, micro-CT-imaging and image processing, were used to set up the electrical model. Anatomical data could be measured up to 5-6 vessel generations in each tree and showed exponential trend lines, used to predict data for higher generations. Simulated flow and pressure were in accordance with literature data. The model was able to simulate effects of pressure-driven HMP on liver hemodynamics and reproduced observations such as flow competition between the hepatic artery and portal vein. Our simulations further indicate that, from a pure biomechanical (shear stress) standpoint, HMP with low pressures should not result in organ damage, and that fluid viscosity has no effect on the shear stress experienced by the liver microcirculation in pressure-driven HMP.
Keywords :
biomechanics; biomedical engineering; blood vessels; equivalent circuits; haemodynamics; haemorheology; liver; physiological models; HMP flow distributions; HMP internal pressure; anatomical data; biomechanics; electrical analog model; hepatic artery; human liver blood circulation electrical model; human liver hemodynamics; human liver perfusion; hypothermic machine perfusion; microCT image processing; microCT imaging; organ preservation; portal vein; shear stress; vascular corrosion casting; Arteries; Casting; Corrosion; Hemodynamics; Humans; Image processing; Liver; Portals; Protocols; Stress; Biological system modeling; biomedical engineering; biomedical image processing; fluid dynamics; liver; Cold Temperature; Hemodynamics; Hepatic Artery; Hepatic Veins; Humans; Image Processing, Computer-Assisted; Liver; Microcirculation; Models, Anatomic; Models, Cardiovascular; Organ Preservation; Perfusion;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.2010.2065229
Filename :
5546919
Link To Document :
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