Pulmonary Arterial Vasculature in Neonatal Hyaline Membrane Disease

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Abstract
Long dash]Many small muscular pulmonary arteries and most pulmonary arterioles in lungs of newborn infants with hyaline membrane disease cannot be filled with a barium sulfate solution. In the control group, composed of normal, 4-day-old lambs, such vessels were easily and completely injected. Hence these vessels are supposed to play an important role in the pulmonary hypoperfuslon, recently demonstrated in the respiratory distress syndrome of the newborn.

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