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Related Experiment Videos

Fibrinolysis changes in normal pregnancy

J Bellart1, R Gilabert, J Fontcuberta

  • 1Department of Obstetrics and Gynecology, Joan XXIII University Hospital, Rovira i Virgili University, Tarragona, Spain.

Journal of Perinatal Medicine
|January 1, 1997
PubMed
Summary

Pregnancy alters fibrinolysis, increasing tissue plasminogen activator and D-dimer, peaking at delivery. Plasminogen activator inhibitors, particularly PAI-2, rise in the third trimester, with some markers remaining elevated postpartum.

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Area of Science:

  • Reproductive Medicine
  • Hematology
  • Physiology

Background:

  • Pregnancy is associated with significant physiological changes impacting hemostasis and fibrinolysis.
  • Understanding these dynamic alterations is crucial for managing pregnancy-related complications.

Purpose of the Study:

  • To investigate the temporal changes in key fibrinolysis parameters throughout pregnancy, delivery, and the early postpartum period.
  • To quantify levels of tissue plasminogen activator, D-dimer, PAI-1, and PAI-2 across different gestational stages.

Main Methods:

  • Longitudinal study involving 60 healthy pregnant women.
  • Blood samples collected during the first, second, and third trimesters, at delivery, and three days postpartum.
  • Commercial assays used to measure fibrinolysis markers: tissue plasminogen activator, D-dimer, plasminogen activator inhibitor type 1 (PAI-1), and plasminogen activator inhibitor type 2 (PAI-2).

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Main Results:

  • Tissue plasminogen activator and D-dimer levels progressively increased after the first trimester, reaching peak concentrations during delivery.
  • Plasminogen activator inhibitors (PAI-1 and PAI-2) were elevated, with PAI-2 showing a marked increase, peaking in the third trimester.
  • Postpartum, while overall fibrinolytic activity showed recovery, D-dimer and PAI-2 levels remained significantly above non-pregnant ranges by three days after delivery.

Conclusions:

  • Pregnancy induces substantial, stage-specific changes in the fibrinolytic system, characterized by increased pro-fibrinolytic and anti-fibrinolytic factors.
  • Elevated D-dimer and PAI-2 persist into the early postpartum period, suggesting a prolonged impact on coagulation and fibrinolysis.
  • These findings contribute to the understanding of normal pregnancy-related hemostatic adaptations.