4.2 Article

Esophageal pressure as an estimate of average pleural pressure with lung or chest distortion in rats

Journal

RESPIRATORY PHYSIOLOGY & NEUROBIOLOGY
Volume 186, Issue 2, Pages 229-235

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.resp.2013.02.006

Keywords

Abdominal distension; Chest compression; Chest wall mechanics; Lung mechanics; Rib cage restriction

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Pressure-volume curves of the lungs and chest wall require knowledge of an effective 'average' pleural pressure (Ppl(av)), and are usually estimated using esophageal pressure as PLes-V and Pw(es)-V curves. Such estimates could be misleading when Ppl becomes spatially non-uniform with lung lavage or shape distortion of the chest. We therefore measured PLes-V and Pw(es)-V curves in conditions causing spatial non-uniformity of Ppl in rats. PLes-V curves of normal lungs were unchanged by chest removal. Lung lavage depressed PLes-V but not Pw(es)-V curves to lower volumes, and chest removal after lavage increased volumes at PL >= 15 cmH(2)O by relieving distortion of the mechanically heterogeneous lungs. Chest wall distortion by ribcage compression or abdominal distension depressed Pw(es)-V curves and PLes-V curves of normal lungs only at PL >= 3 cmH(2)O. In conclusion, Pes reflects Ppl(av) with normal and mechanically heterogeneous lungs. With chest wall distortion and dependent deformation of the normal lung, changes of PLes-V curves are qualitatively consistent with greater work of inflation. (C) 2013 Elsevier B.V. All rights reserved.

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