Elasticity of the Pulmonary Alveolar Microvascular Sheet in the Cat

Author:

SOBIN SIDNEY S.1,FUNG Y. C.1,TREMER HERTA M.1,ROSENQUIST THOMAS H.1

Affiliation:

1. Los Angeles County Heart Association--University of Southern California Cardiovascular Research Laboratory, Los Angeles Country--University of Southern California Medical Center Los Angeles, California 90033, and the Department of Applied Mechanics and Engineering Sciences, University of California San Diego, La Jolla, California 92037

Abstract

The pulmonary interalveolar capillary bed of the cat has previously been shown to be consistent with a sheet-like endothelium-lined space bridged by avascular endothelium-covered posts. This was termed the sheet-flow model, and blood flow through that space is termed sheet flow. The initial formulation of the sheet-flow theory and model required that sheet thickness be the independent variable. Sheet thickness ( h ) was measured in vertical and horizontal silicone-elastomer-perfused cat lungs over the transmural (alveolar-capillary) pressure (Δ) range of 6.3 to 27 cm H 2 O. A plot of h vs. Δ for 2753 individual measurements is linear over the measured pressure range. The regression line is described by h = 4.28 + 0.2191 Δ. Sheet thickness of 4.28 µ at zero pressure is an extrapolated value. The value 0.2191 µ/cm H 2 O is the compliance coefficient (α) of the pulmonary capillary bed. Electron microscopic studies demonstrated that the capillary posts have a highly organized internal structure with abundant collagen and an elastin or elastinlike core. Collagen fibers originate from the alveolar-capillary basement membrane, emerge in a herringbone pattern, and sweep toward the center of the post in a helical array around the elastinlike amorphous and fibrillar core. The unusual compliance of the microvascular blood vessels in the lung can be correlated with the architectural organization within the posts.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Cardiology and Cardiovascular Medicine,Physiology

Reference18 articles.

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