[An experimental study on the pathogenesis of the acute pulmonary insufficiency (author's transl)].

Parameters of the lungs as Compliance PaCO2, PaO2, have been measured in connection with experimental, pathophysiological insults like hematoma, bone marrow intravasation and hemorrhage, in rabbits. Concerning the compliance quotient, a statistically proved decrease was found within the groups, which have had a hematoma. Moreover, the histological picture of the lungs from rabbits with a hematom showed perivascular and intersitial edema and considerable atelectases. Serum of animals, which have had a hematom for at least 24 h has been fractionated by gel chromatography; low molecular weight substances of the fractionated serum were injected into healthy recipients. Thereafter, measurement of the centralvenous pressure suggests the appearance of substances, pharmacodynamic similar to 5-Hydroxytryptamin, in blood of rabbits with hematom.