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Coagulation index to distinguish severe preeclampsia from normal pregnancy
Takao Kobayashi1, Kazuhiro Sumimoto, Naoki Tokunaga
1Department of Obstetrics and Gynecology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu City, Shizuoka, 431-3192 Japan. tkoba@hama-med.ac.jp
Insights
A new coagulation index effectively distinguishes severe preeclampsia from normal pregnancy. This index, using parameters like platelet count changes, helps identify hypercoagulable states and guides optimal timing for pregnancy termination.
Area of Science:
- Obstetrics and Gynecology
- Hematology
- Reproductive Medicine
Background:
- Preeclampsia is a serious pregnancy complication characterized by high blood pressure.
- Distinguishing severe preeclampsia from normal pregnancy is crucial for timely intervention.
- Coagulation and fibrinolysis disorders are implicated in preeclampsia pathogenesis.
Purpose of the Study:
- To develop and validate a novel coagulation index for differentiating severe preeclampsia from normal pregnancy.
- To assess the utility of the new index in identifying hypercoagulable states associated with preeclampsia severity.
- To explore the index's predictive value for determining optimal pregnancy termination timing.
Main Methods:
- A multivariate logistic regression model was employed to establish the coagulation index.
- Key parameters included Antithrombin (AT) activity, thrombin-antithrombin (TAT) complex, D-dimer, and change in platelet count (DeltaPlt).
- The index was calculated for 72 normal pregnancies and 56 severe preeclampsia cases.
Main Results:
- The developed coagulation index significantly differentiated between normal pregnancies (-0.77 ± 0.51) and severe preeclampsia (1.41 ± 1.56) (p < 0.0001).
- Patients with severe preeclampsia delivered via cesarean section exhibited higher coagulation index values (1.62 ± 1.66) compared to those with vaginal delivery (0.52 ± 0.34) (p < 0.05).
- An excessive hypercoagulable state, indicated by the index, correlates with pregnancy termination due to preeclampsia aggravation.
Conclusions:
- The new coagulation index provides a reliable method for distinguishing severe preeclampsia from normal pregnancy.
- The index reflects the degree of hypercoagulability and may aid in managing preeclampsia complications.
- A coagulation index exceeding 1.20 suggests a potential need for pregnancy termination, guiding clinical decision-making.
Abstract:
The purpose of this study was to establish a new coagulation index to distinguish severe preeclampsia from normal pregnancy using optimal coagulation parameters. The difference between platelet counts in early gestation and before delivery (DeltaPlt = [platelet counts before delivery] - [platelet counts in early gestation]) was calculated as an index of changes in platelet counts. Antithrombin (AT) activity, thrombin-antithrombin (TAT) complex, fibrin degradation products (FDP) D-dimer, and DeltaPlt were investigated in 72 cases of normal pregnant women in the third trimester of pregnancy and 56 cases of severe preeclampsia. The new coagulation index was calculated using multivariate logistic regression analysis. As a result, in a case using four parameters, the following formula was obtained: Y = (-0.019 x AT activity) + (0.067 x TAT) + (0.067 x D-dimer) + (-0.064 x DeltaPlt) + 0.706. According to this formula, coagulation indices in normal pregnant women and in patients with severe preeclampsia were -0.77 +/- 0.51 and 1.41 +/- 1.56, respectively (p < 0.0001). Among patients with severe preeclampsia, coagulation and fibrinolysis disorders before delivery were typical in patients terminated by cesarean section (coagulation index = 1.62 +/- 1.66) compared with those with successful vaginal delivery (coagulation index = 0.52 +/- 0.34) (p < 0.05). These facts suggest that an excessive hypercoagulable state is associated with the termination of pregnancy resulting from the aggravation of preeclampsia. From the viewpoint of coagulation and fibrinolysis disorders, the predictive value in order to decide the optimal time for the termination of pregnancy could be recommended when the coagulation index exceeded 1.20.