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Thrombin-antithrombin III complexes and antithrombin III in amniotic fluid
M Uszyński1, A Kielkowski, W Uszyński
1Department of Propaedeutics of Medicine, University School of Medical Sciences, Bydgoszcz, Poland.
Gynecologic and Obstetric Investigation
|January 1, 1997
Summary
Thrombin generation is significantly higher in amniotic fluid than plasma during childbirth. Thrombin-antithrombin (TAT) complexes are 2-4 times more concentrated in amniotic fluid, increasing with labor progression.
Area of Science:
- Obstetrics and Gynecology
- Hematology
- Biochemistry
Background:
- Antithrombin III (AT III) is a key regulator of coagulation.
- Thrombin-antithrombin III (TAT) complexes are markers of thrombin generation.
- Understanding coagulation dynamics in amniotic fluid is crucial for pregnancy monitoring.
Purpose of the Study:
- To compare thrombin generation markers in amniotic fluid and maternal plasma.
- To investigate changes in TAT and AT III levels during labor.
Main Methods:
- Quantified TAT complexes using ELISA.
- Measured AT III antigen via Partigen plates.
- Assessed AT III activity using chromogenic substrates.
- Analyzed samples from 39 parturient women.
Main Results:
- AT III activity and antigen were significantly lower in amniotic fluid (<20% of plasma levels).
- TAT concentrations were 2-4 times higher in amniotic fluid compared to plasma.
- TAT levels increased substantially after childbirth in amniotic fluid.
Conclusions:
- Amniotic fluid exhibits significantly higher thrombin generation than plasma.
- Thrombin generation and TAT formation intensify during labor and postpartum.
- These findings highlight localized coagulation activity within the amniotic fluid compartment.