THE EFFECT OF POSITIVE AND NEGATIVE INTRA-THORACIC PRESSURE ON PERIPHERAL VENOUS PRESSURE IN MAN

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Abstract
Venous pressure was detd. in the ante-cubital vein by the direct method in normal subjects who breathed from a chamber in which the pressure varied from 14 cm. of water above to 14 cm. below atmospheric. In the supine subject, with the arm below heart level, the venous pressure decreased when the intra-thoracic pressure was decreased and increased when the intra-thoracic pressure was increased. Thus, venous pressure appears to be a function of right auricular pressure. Similar experiments on the supine subject with the arm above heart level and in the sitting subject with the arm below heart level indicate that in these positions venous pressure is not a function of right auricular pressure because the veins become partially collapsed.

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