Abstract
Ethiodol was injected into pleural lymphatics of lungs post- mortem in order to opacify deep lymphatics and thus determine the existence of ventilation-related pumping. Radiographs showed the lymphatics (a) during a period without flow, with the lung at a fixed inflation level, and (b) after ventilation within a normal range. Ventilation by both positive and nega- tive pleural pressure produced forward flow in deep lymphatics which had been filled while the lung was at a low volume (functional residual capacity). Ven- tilation did not produce flow in deep lymphatics which had been filled while the lung was at a higher volume (70% total lung capacity).
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