Use of thromboelastography to guide thromboprophylaxis after caesarean section

Area of Science:

• Obstetrics and Gynecology
• Hematology
• Anesthesiology

Background:

• Thromboprophylaxis is crucial after caesarean section.
• Standard coagulation tests often fail to detect the effects of low-dose heparin.
• Investigating advanced methods to assess heparin's impact is necessary.

Purpose of the Study:

• To evaluate thromboelastography's ability to detect and quantify unfractionated heparin's effect on coagulation post-caesarean section.
• To compare thromboelastography findings with conventional laboratory tests.

Main Methods:

• Nineteen women undergoing caesarean section were studied.
• Blood samples were analyzed using thromboelastography (plain and heparinase cuvettes) before and after unfractionated heparin (7500 IU) administration.
• Anti-factor Xa levels were measured.

Main Results:

• Thromboelastography detected a significant effect of unfractionated heparin (P=0.0072).
• Both plain and heparinase samples showed decreased R times post-heparin, indicating a pro-coagulant effect of surgery.
• Anti-factor Xa levels were minimally detected, suggesting limited anticoagulant activity.

Conclusions:

• Thromboelastography effectively detects unfractionated heparin's impact on coagulation, surpassing conventional tests.
• Surgery exerts a pro-coagulant effect, partially counteracted by unfractionated heparin.
• A 7500 IU dose of subcutaneous unfractionated heparin showed minimal anticoagulant effect in this context.