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Effect of gravitational and inertial forces on vertical distribution of pulmonary blood flowVertical distribution of pulmonary blood flow (VDPBF) was studied, using radioactive microsphere emboli, in dogs without thoracotomy in the right decubitus position during exposure to lateral accelerations of 1, 2, 4, and 6 G. At all levels of force environment studied, an inverse linear relationship was observed between vertical height in the thorax and pulmonary blood flow (ml/min/ml lung tissue) with a decrease in flow to the most dependent region of the lung despite large increases in intravascular pressures at this site. Changes in blood flow were smallest at the mid-lung level, the hydrostatic 'balance point' for vascular and pleural pressures. These force environment-dependent changes in VDPBF are not readily explainable by the Starling resistor analog. Gravity-dependent regional differences in pleural and associated interstitial pressures, plus possible changes in vascular tone resulting from inadequate aeration of blood in the most dependent regions of the lung, probably also affect VDPBF.
Document ID
19780052245
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chevalier, P. A.
(Mayo Clinic Rochester, MN, United States)
Reed, J. H., Jr.
(Mayo Clinic Rochester, MN, United States)
Vandenberg, R. A.
(Mayo Clinic Rochester, MN, United States)
Wood, E. H.
(Mayo Clinic; Mayo Foundation Rochester, Minn., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1978
Subject Category
Life Sciences (General)
Accession Number
78A36154
Funding Number(s)
CONTRACT_GRANT: NIH-HL-04664
CONTRACT_GRANT: F49620-76-C-0001
CONTRACT_GRANT: NGR-24-003-001
CONTRACT_GRANT: NIH-RR-7
Distribution Limits
Public
Copyright
Other

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