On Relationship Between Bulk Modulus and Relative Volume of Lung During Inflation-Deflation Maneuvers

[+] Author and Article Information
Y. C. Pao

Department of Engineering Mechanics, University of Nebraska-Lincoln, Lincoln, Neb. 68588

D. S. Shy

Brunswick Corporation, Lincoln, Neb.

P. A. Chevalier

Medtronic Incorporated, Minneapolis, Minn. 55440

J Biomech Eng 104(2), 136-142 (May 01, 1982) (7 pages) doi:10.1115/1.3138327 History: Received October 27, 1980; Revised December 08, 1981; Online June 15, 2009


An equation of the form K = C /[1 − (V/V max )]n relating the bulk modulus K to the relative volume V/V max of lung region during inflation-deflation maneuvers is proposed. It well represents the observed fact that the bulk modulus becomes infinitely large when the regional volume approaches its maximum capacity Vmax . The parameter C describes the bulk modulus at low regional volume whereas the parameter n quantifies the rate at which the bulk modulus changes during the inflation-deflation maneuvers. The mathematical expressions for the regional pressure, P , and volume V , are obtained by integrating the equation K = VdP/dV . They fit exceedingly well with the experimental data recorded during inflation-deflation tests of six excised canine lung lobes.

Copyright © 1982 by ASME
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