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[Evaluation of haemostasis in children treated with valproic acid]
D Schädlich1, D Friebel, J Schallner
1Universitätsklinikum Carl Gustav Carus Dresden, Klinik und Poliklinik für Kinder- und Jugendmedizin, Bereich Hämatologie, Onkologie und Hämostaseologie, Fetscherstr. 74, 10309 Dresden, Germany. ralf.knoefler@uniklinikum-dresden.de
Insights
Valproic acid therapy in children showed minimal impact on coagulation, with only a few cases experiencing bleeding. Extended coagulation diagnostics are recommended before surgery for these patients.
Area of Science:
- Pediatric Hematology
- Pharmacology
- Clinical Chemistry
Context:
- Valproic acid is commonly used for epilepsy and bipolar disorder in children.
- The combination of valproic acid with lamotrigine is also frequently prescribed.
- The hemostatic effects of these therapies in pediatric populations require thorough investigation.
Purpose:
- To evaluate the impact of valproic acid monotherapy and combination therapy with lamotrigine on coagulation parameters in children.
- To assess bleeding symptoms in pediatric patients undergoing these treatments.
Summary:
- This study compared coagulation parameters in children on valproic acid monotherapy, valproic acid-lamotrigine combination therapy, and a control group.
- While most coagulation tests showed no significant differences, the combination therapy group exhibited prolonged closure times (CT).
- Platelet counts were lower in the monotherapy group, and mild bleeding tendencies were observed in a few children.
Impact:
- Valproic acid therapy generally has a clinically insignificant effect on hemostasis in most pediatric cases.
- Extended coagulation diagnostics are advised prior to surgical procedures for children on valproic acid.
- This research contributes to understanding the safety profile of valproic acid in pediatric patients regarding bleeding risk.
Unlabelled:
Coagulation parameters were determined in children with valproic acid mono- and valproic acid-lamotrigin combination therapy.
Patients, Methods:
Monotherapy group (n = 22; mean age: 10.5 years) was compared to combination therapy (n = 7; 12.9 years) and a control group (n = 22; 8.7 years). The following parameters were measured: aggregation and ATP-release in whole blood (ADP: 20 μmol/l, collagen: 1 μg/ml, thrombin: 0.5 U/ml), PFA-100® closure times (CT), blood cell counts, global tests, VWF:Ag, VWF:CBA, factors VIII and XIII as well as fibrinogen. Bleeding symptoms were evaluated by using a questionnaire.
Results:
For ADP- and collagen-induced aggregation as well as for ATP release no significant differences between the groups were detected. The combined therapy group showed significantly prolonged CT. Von Willebrand disease was not detected in any of the patients. The platelet count was significantly decreased in the monotherapy group. In six children a mild bleeding tendency was observed, mostly epistaxis.
Conclusion:
A clinically relevant influence of valproic acid on haemostasis was found only in few cases. However, before surgical procedures an extended coagulation diagnostics is recommended in patients with valproic acid therapy.
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