PMID: 3754553Apr 1, 1986Paper

Surface forces in lungs. I. Alveolar surface tension-lung volume relationships

Journal of Applied Physiology
J C Smith, D Stamenovic

Abstract

Alveolar surface tension (gamma)-lung volume relationships were obtained for quasi-static and dynamic lung pressure-volume (PV) histories from measurements of PV curves of liquid- and air-filled excised rabbit lungs. PV relationships were measured at room temperature in lungs filled with test liquids with constant liquid-liquid interfacial tensions with alveolar surface-active materials; and air-filled lungs before and after the normal alveolar surface film was covered with test liquids with constant values of liquid- and air-liquid interfacial tensions. Interfacial tensions of test liquids were measured in a surface balance on monolayers of dipalmitoyl phosphatidylcholine. Values of gamma for the normal air-filled lung were obtained either from points of intersection between PV curves with the normal and test liquid interface or from a general relationship between gamma and the component of recoil pressure due to surface tension derived from the data. In contrast to previous analyses that have used PV measurements, this approach does not depend on assumptions about lung microstructural geometry. Surface tension-volume relationships for the normal air-filled lung show a prominent hysteresis with surface tension ranging from nea...Continue Reading

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