[Studies on relationship between complement and blood coagulation system in toxemia of pregnancy (author's transl)].

Presence of chronic DIC (disseminated intravascular coagulation) eliciting an impeded blood coagulation has been postulated of late as one of the etiology causing toxemia of pregnancy, for which studies have been immunologically made. These theories remain unestablished. In this regard, the role of complement in blood coagulation has been noted, and their correlation is being elucidated. The author introduced a concept of complement to etiological theory of an impeded blood coagulation origin, by which toxemia of pregnancy was studied with emphasis placed on their correlation. The results obtained are as follow: 1) Thrombin and thromboplastin allowed in vitro to decreases the potency of complement, and the lowering also was seen even in the case of simultaneous supplement of urokinase and plasminogen. 2) The decrease also was periodically seen in rabbit's DIC experimentally made. 3) An increase in CH50, C3, C4, and factor B of normal pregnancy were of significance when compared with those of the control (p less than 0.001), while C1 inactivator decreased significantly (p less than 0.001). 4) CH50 was 52.2 +/- 2.4U/ml in severe toxemia, a decrease being of significance (p less than 0.01) as compared with that in third trimester of normal pregnancy. Those other parameters which tended to decrease included hemolytic activity of alternative pathway (AP-CH50), C4, and factor B except C1 inactivator with a trend being high.