[Role of low-density lipoproteins of the blood plasma during labor in heparin neutralization].

It was shown that increased antiheparin activity of the blood plasma of women in labour is evoked by increased level of low density lipoproteids (LDL). This activity does not depend on changes neither of the level of other compounds neutralizing heparin (fibrinogen, acid alpha 1-glycoproteid, globulins, basic proteins) nor conditioning its action (antithrombin-III). The intensity of antiheparin action of LDL increases in the presence of calcium ions.