DISPLACEMENT OF BLOOD FROM THE LUNGS BY PRESSURE BREATHING

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Abstract
The subject lay on a nearly-balanced teeter board, the excess weight on one end being recorded on a revolving drum. Simultaneous records were taken of foot vol. by a plethysmograph. During pressure breathing (30 cm. H2O) the feet grow heavier because of blood displaced from the lungs. It is estimated that about 170 ml. of blood goes into the legs and 330 ml. into the abdomen. The vol. of the legs normally increases at the onset of pressure breathing but when a cuff is placed around the leg and is inflated to 60 mm. Hg to protect the leg from passive inflation due to increased venous pressure, the vol. of the leg in the plethysmograph decreases with pressure breathing thus demonstrating a vasoconstrictor reflex.

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