Resumo

ALMAGRO VAZQUEZ, Delfina. Hemostasia in pregnancy. Rev Cubana Hematol Inmunol Hemoter [online]. 2000, vol.16, n.2, pp. 90-98. ISSN 1561-2996.

There are hemostatic mechanism alterations in pregnancy that determine particular conditions which facilitate the activation of this biological system before stimuli that otherwise would be adequately controlled by the body. It has been confirmed that there exists hypercoagulability in pregnancy, therefore it has been included in the group of the so called acquired thrombophilias. Basic elements of the hemostatic mechanism, the coagulation system, platelets and fibrinolytic mechanism affect in a decisive way the thrombotic trend of pregnancy. During pregnancy, a series of changes is observed in the clotting mechanism such as progressive increase of fibrinogen and factors VII, VIII, IX and von Willebrand, soluble fibrin complexes, thrombin-prothrombin complexes and 1 + 2 fragments of prothrombin. A decrease in protein C and protein S has also been found. Platelets play an important role in the thrombotic trend during pregnancy, also an increase of platelet aggregation, a reduction of responsive capacity to activation by prostacycline and a decline in AMPc formation have been observed. Pregnancy has a remarkable effect on the fIbrinolytic system, fundamentally due to a progressive increase of type-1 plasminogen activator inhibitor (PA1-I) and the type-2 plasminogen activator inhibitor (PAI-2)

Palavras-chave : HEMOSTATICS; PREGNANCY COMPLICATIONS, HEMATOLOGIC; BLOOD PLATELETS; FIBRINOLYSIS.

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