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We investigated the effect of the synthetic low-molecular thrombin inhibitor 4-amidinophenyl-pyruvic acid (APPA) on the maternal and fetal coagulation at 10 far advanced in pregnancy sheep. APPA inhibits as well the maternal as by diaplacental passage the fetal hemostasis in dependence on the dosage till the incoagulability. The effect in the fetal organism occurs after a delay of some minutes and wars of a bit earlier.

With the aid of an asphyxia model in rabbit fetuses the possibility of diaplacental influence on the hypoxic effects of the fetal organism has been investigated. The trial to change the vasotonia during the asphyctic shock by sympathicomimetic or -lytic drugs (Dilatol, Obsidan, Ergocomb, Regitin) remained to be without any effect on the DIC in the fetal organism. Trying to seal the vascular wall by the high-molecular-weight basic polypeptide Aprotinin there seemed rather to be an increase of the intravascular fibrin sedimentation.

There is reported on the possibilities of diaplacental influencing on the DIC arising from the hypoxia we provoked with the help of an asphyxia model in rabbit fetuses. We could demonstrate the impossibility of influencing on the fetal vasal content by means of low molecular dextran, heparin or streptokinase. On the contrary, the possibility exists to influence on the fetal hemostasis by low molecular synthetic substances. The antifibrinolytic drug PAMBA causes in case of advanced acidosis diaplacental a definite growth of the intravascular coagulation, as well. But an inhibition of the fibrin sedimentation in the terminal vessels at the asphyctic shock can be achieved by applying the ethyl ester of the 4-amidinophenylpyruvic acid (APPA).