Abstract
The effect of the abdomen on the vertical gradient of pleural surface pressure in the horizontal postures has been quantitated by determining the topography of pleural surface pressure after evisceration. In supine, prone and lateral rabbits the overall vertical gradient of transpulmonary pressure after evisceration decreased 2–3 times, and more than the lung density. In prone rabbits suspended from the vertebral column the overall vertical gradient after evisceration decreased while the lung density increased. The lines relating lung height to pleural surface pressure after evisceration became similar in all the horizontal postures. In the head-up rabbits and dogs the overall vertical gradient of transpulmonary pressure was about twice the lung density. These results indicate that the vertical gradient of transpulmonary pressure does not depend essentially upon the lung density and that, in the horizontal postures, it is markedly affected by the vertical gradient of abdominal pressure.
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