Vascular geometry and oxygen diffusion in the vicinity of artery-vein pairs in the kidney

J.P. Ngo; S. Kar; M.M. Kett; B.S. Gardiner; J.T. Pearson; D.W. Smith; J. Ludbrook; J.F. Bertram; R.G. Evans

doi:10.1152/ajprenal.00382.2014

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Vascular geometry and oxygen diffusion in the vicinity of artery-vein pairs in the kidney

Journal article

Peer reviewed

Vascular geometry and oxygen diffusion in the vicinity of artery-vein pairs in the kidney

J.P. Ngo, S. Kar, M.M. Kett, B.S. Gardiner, J.T. Pearson, D.W. Smith, J. Ludbrook, J.F. Bertram and R.G. Evans

AJP: Renal Physiology, Vol.307(10), pp.F1111-F1122

2014

DOI: https://doi.org/10.1152/ajprenal.00382.2014

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Abstract

Renal arterial-to-venous (AV) oxygen shunting limits oxygen delivery to renal tissue. To better understand how oxygen in arterial blood can bypass renal tissue, we quantified the radial geometry of AV pairs and how it differs according to arterial diameter and anatomic location. We then estimated diffusion of oxygen in the vicinity of arteries of typical geometry using a computational model. The kidneys of six rats were perfusion fixed, and the vasculature was filled with silicone rubber (Microfil). A single section was chosen from each kidney, and all arteries (n = 1,628) were identified. Intrarenal arteries were largely divisible into two "types," characterized by the presence or absence of a close physical relationship with a paired vein. Arteries with a close physical relationship with a paired vein were more likely to have a larger rather than smaller diameter, and more likely to be in the inner-cortex than the mid- or outer cortex. Computational simulations indicated that direct diffusion of oxygen from an artery to a paired vein can only occur when the two vessels have a close physical relationship. However, even in the absence of this close relationship oxygen can diffuse from an artery to periarteriolar capillaries and venules. Thus AV oxygen shunting in the proximal preglomerular circulation is dominated by direct diffusion of oxygen to a paired vein. In the distal preglomerular circulation, it may be sustained by diffusion of oxygen from arteries to capillaries and venules close to the artery wall, which is subsequently transported to renal veins by convection.

Details

Title: Vascular geometry and oxygen diffusion in the vicinity of artery-vein pairs in the kidney
Authors/Creators: J.P. Ngo (Author/Creator) - Monash University
S. Kar (Author/Creator) - The University of Western Australia
M.M. Kett (Author/Creator) - Monash University
B.S. Gardiner (Author/Creator) - The University of Western Australia
J.T. Pearson (Author/Creator) - Monash University
D.W. Smith (Author/Creator) - The University of Western Australia
J. Ludbrook (Author/Creator) - The University of Adelaide
J.F. Bertram (Author/Creator) - Monash University
R.G. Evans (Author/Creator) - Monash University
Publication Details: AJP: Renal Physiology, Vol.307(10), pp.F1111-F1122
Publisher: American Physiological Society
Identifiers: 991005540122207891
Copyright: © 2014 the American Physiological Society.
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 1 Clinical & Life Sciences; 1.55 Urology & Nephrology - General; 1.55.830 Acute Kidney Injury
Web Of Science research areas: Physiology; Urology & Nephrology
ESI research areas: Clinical Medicine