The interdependent contributions of gravitational and structural features to perfusion distribution in a multiscale model of the pulmonary circulation

A R Clark; M H Tawhai; E A Hoffman; K S Burrowes

doi:10.1152/japplphysiol.00775.2010

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The interdependent contributions of gravitational and structural features to perfusion distribution in a multiscale model of the pulmonary circulation

Journal article

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The interdependent contributions of gravitational and structural features to perfusion distribution in a multiscale model of the pulmonary circulation

A R Clark, M H Tawhai, E A Hoffman and K S Burrowes

Journal of applied physiology (1985), Vol.110(4), pp.943-955

04/2011

DOI: 10.1152/japplphysiol.00775.2010

PMCID: PMC3075121

PMID: 21292845

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Abstract

Recent experimental and imaging studies suggest that the influence of gravity on the measured distribution of blood flow in the lung is largely through deformation of the parenchymal tissue. To study the contribution of hydrostatic effects to regional perfusion in the presence of tissue deformation, we have developed an anatomically structured computational model of the pulmonary circulation (arteries, capillaries, veins), coupled to a continuum model of tissue deformation, and including scale-appropriate fluid dynamics for blood flow in each vessel type. The model demonstrates that both structural and the multiple effects of gravity on the pulmonary circulation make a distinct contribution to the distribution of blood. It shows that postural differences in perfusion gradients can be explained by the combined effect of tissue deformation and extra-acinar blood vessel resistance to flow in the dependent tissue. However, gravitational perfusion gradients persist when the effect of tissue deformation is eliminated, highlighting the importance of the hydrostatic effects of gravity on blood distribution in the pulmonary circulation. Coupling of large- and small-scale models reveals variation in microcirculatory driving pressures within isogravitational planes due to extra-acinar vessel resistance. Variation in driving pressures is due to heterogeneous large-vessel resistance as a consequence of geometric asymmetry in the vascular trees and is amplified by the complex balance of pressures, distension, and flow at the microcirculatory level.

Pulmonary Circulation - physiology

Models, Cardiovascular

Humans

Hemodynamics - physiology

Lung - blood supply

Lung - physiology

Regional Blood Flow - physiology

Details

Title: Subtitle: The interdependent contributions of gravitational and structural features to perfusion distribution in a multiscale model of the pulmonary circulation
Creators: A R Clark - Auckland Bioengineering Institute, Univ. of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand. alys.clark@auckland.ac.nz
M H Tawhai
E A Hoffman
K S Burrowes
Resource Type: Journal article
Publication Details: Journal of applied physiology (1985), Vol.110(4), pp.943-955
DOI: 10.1152/japplphysiol.00775.2010
PMID: 21292845
PMCID: PMC3075121
NLM abbreviation: J Appl Physiol (1985)
ISSN: 8750-7587
eISSN: 1522-1601
Publisher: United States
Grant note: R01-HL-064368 / NHLBI NIH HHS
Language: English
Date published: 04/2011
Academic Unit: Roy J. Carver Department of Biomedical Engineering; Radiology; Internal Medicine
Record Identifier: 9984051737902771

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