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Early detection of preeclampsia by determination of platelet aggregability
D Felfernig-Boehm1, A Salat, S E Vogl
1Departments of Anaesthesia and General Intensive Care, University of Vienna, A-1090, Vienna, Austria.
Insights
Corrected whole blood impedance aggregometry can predict preeclampsia early. This platelet aggregation test shows a 100% positive predictive value for preeclampsia in early pregnancy.
Area of Science:
- Obstetrics and Gynecology
- Hematology
- Perinatal Medicine
Background:
- Preeclampsia remains a major cause of maternal and fetal complications.
- Platelet activation and aggregation are implicated in preeclampsia pathogenesis.
- Early detection of preeclampsia is crucial for improved maternal and fetal outcomes.
Purpose of the Study:
- To evaluate corrected whole blood impedance aggregometry as an early predictor of preeclampsia.
- To assess the diagnostic performance of platelet aggregation in early and late pregnancy.
- To investigate the relationship between platelet aggregability and preeclampsia development.
Main Methods:
- Seventy-one high-risk pregnancies were studied.
- Platelet aggregation was measured using corrected whole blood impedance aggregometry.
- Data were corrected for hematocrit and platelet count using specialized software.
- Preeclampsia diagnosis was confirmed postpartum.
Main Results:
- Women who developed preeclampsia exhibited significantly higher platelet aggregation responses compared to controls.
- In early pregnancy, the test demonstrated a 100% positive predictive value for subsequent preeclampsia.
- Platelet aggregability was less predictive in late pregnancy.
Conclusions:
- Preeclampsia is associated with exaggerated platelet aggregability, particularly evident in early pregnancy.
- Corrected collagen-induced whole blood platelet aggregation is a promising tool for early preeclampsia detection.
- This method offers a potential strategy for identifying high-risk pregnancies early.
Abstract:
Preeclampsia is still a leading cause of maternal and fetal morbidity and mortality. There is evidence for the involvement of platelets. Therefore, we investigated the suitability of corrected whole blood impedance aggregometry as an early predictor of preeclampsia in 71 consecutive, high-risk pregnancies. According to the occurrence of preeclampsia, defined postpartum by an independent investigator, and the stage of pregnancy (early and late, cutoff: 25 weeks of gestation), four study groups were defined. Platelet aggregation data were corrected for the influence of hematocrit and platelet count by a special purpose software package. Women developing preeclampsia showed significantly higher platelet aggregation response compared to controls in early and late pregnancy. In early pregnancy, all women developing preeclampsia had aggregation responses to collagen higher than the highest responses among the controls. Hence, this test had a 100% positive predictive value of subsequent preeclampsia. Despite being significantly increased, platelet aggregability was of minor predictive value in late pregnancy. We conclude that preeclampsia is accompanied by exaggerated platelet aggregability, particularly perceptible early in the course of pregnancy. We propose collagen-induced whole blood platelet aggregation with correction for the influence of hematocrit and platelet count for early detection of preeclampsia.