PHASIC CHANGES IN INFERIOR CAVA FLOW OF INTRAVASCULAR ORIGIN

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Abstract
Inferior vena cava flow was recorded by a differential manometer connected to a Pitot tube cannula of special design which could be quickly introduced into the thoracic vena cava. Tugs or impingment of the heart beat were avoided, and the chest remained opened. Hence, phasic changes in inferior vena cava flow due to intravascular forces alone were recorded. The results showed: 1. Systole and diastole of the heart by creating pressure changes in the atrium cause rhythmic fluctuations in inferior cava flow which are proportional to these variations. 2. Descent of the diaphragm causes dominantly a marked increase in basal flow in the inferior vena cava which persists even when blood vol. is seriously reduced by hemorrhage.

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