Regional expansion of oleic acid-injured lungs

Marek A. Martynowicz, Thomas A. Minor, Bruce J. Walters, Rolf D. Hubmayr

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113 Scopus citations

Abstract

It has been suggested that dependent regions of an injured lung are collapsed and subject to cyclic reopening and collapse during mechanical ventilation. To test this hypothesis, we measured both temporal and spatial heterogeneity of lobar expansion in oleic acid (OA)-injured dogs. Regional volumes were measured in nine dogs (seven supine and two prone) during closed loop sinusoidal oscillations of the lungs before and after OA injury using the parenchymal marker technique. In contrast to computer tomography, the parenchymal marker technique provides absolute measures of regional tissue dimensions as opposed to relative measures of regional air to liquid content. The experiments generated three major findings: (1) OA injury did not lead to the collapse of dependent lung units at FRC, (2) OA injury did not steepen the vertical gradient in regional lung volumes at FRC, and (3) during sinusoidal oscillation of the OA-injured lungs from FRC, dependent regions did not undergo cyclic reopening and collapse. On the basis of these results, we propose an alternative mechanism for the topographic variability in regional impedances and lung expansion after injury, namely liquid and foam in conducting airways.

Original languageEnglish (US)
Pages (from-to)250-258
Number of pages9
JournalAmerican Journal of Respiratory and Critical Care Medicine
Volume160
Issue number1
StatePublished - 1999

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ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

Cite this

Martynowicz, M. A., Minor, T. A., Walters, B. J., & Hubmayr, R. D. (1999). Regional expansion of oleic acid-injured lungs. American Journal of Respiratory and Critical Care Medicine, 160(1), 250-258.