title: The influence of labor on thrombotic and fibrinolytic systems.
abstract: Plasma fibrinopeptide A, thrombin-antithrombin III complexes, tissue-plasminogen activator and alpha 2-plasmin inhibitor-plasmin complexes were measured early in the first stage of labor, in the second stage of labor and at 15 min after placental separation. Fibrinopeptide A and thrombin-antithrombin III complex levels did not change from the first to the second stage of labor but increased significantly after placental separation. There was a significant increase of the tissue-plasminogen activator level between the early first stage of labor and the second stage of labor, and it remained high after placental separation. A significant increase in the level of plasma alpha 2-plasmin inhibitor-plasmin complexes was observed after placental separation. These findings suggest that activation of the thrombotic system occurs at the time of placental separation and that activation of the fibrinolytic system begins during labor before placental separation to compensate for the hypercoagulable state which develops at the time of delivery.
authors.affiliation: Department of Obstetrics and Gynecology, Kumamoto University Medical School, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yoshimura
authors.forename: M
authors.initials: M
authors.lastname: Ito
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: H
authors.initials: H
authors.lastname: Okamura
mesh_terms: D000328:Adult; D000933:Antifibrinolytic Agents / Q000378:metabolism; D000990:Antithrombin III / Q000378:metabolism; D015415:Biomarkers / Q000097:blood; D001777:Blood Coagulation; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005341:Fibrinolysin / Q000378:metabolism; D005342:Fibrinolysis; D005344:Fibrinopeptide A / Q000378:metabolism; D006801:Humans; D007743:Labor, Obstetric / Q000097:blood*; D010447:Peptide Hydrolases / Q000378:metabolism; D011247:Pregnancy; D013917:Thrombin / Q000378:metabolism; D010959:Tissue Plasminogen Activator / Q000378:metabolism; D000979:alpha-2-Antiplasmin / Q000378:metabolism
chemical_list: D000933:Antifibrinolytic Agents; D015415:Biomarkers; D000979:alpha-2-Antiplasmin; C046193:antithrombin III-protease complex; C037742:plasmin-plasmin inhibitor complex; D005344:Fibrinopeptide A; D000990:Antithrombin III; D010447:Peptide Hydrolases; D013917:Thrombin; D010959:Tissue Plasminogen Activator; D005341:Fibrinolysin