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Hematologic toxicity of sodium valproate
1Department of Pediatric Hematology/Oncology, New York Presbyterian Hospital-Cornell Medical Center, New York 10021, USA.
Insights
Sodium valproate can cause hematologic toxicities like bone marrow suppression and bleeding issues. Monitoring and dosage adjustments are key for managing these common side effects in epilepsy patients.
Area of Science:
- Hematology
- Pharmacology
- Pediatric Neurology
Background:
- Sodium valproate is a widely used anticonvulsant for refractory childhood epilepsy.
- Hepatotoxicity is a known side effect, but hematologic toxicity is increasingly recognized with higher doses.
- Pediatric hematologists are often consulted for valproate-induced hematologic issues, especially in pre- or perioperative settings.
Purpose of the Study:
- To characterize the hematologic toxicities associated with sodium valproate.
- To provide management guidelines for patients experiencing these toxicities.
Main Methods:
- A literature review was conducted.
- Searched for studies on valproate (monotherapy or polytherapy) focusing on hematology and bleeding.
Main Results:
- Valproate can cause bone marrow suppression, aplastic anemia, and cytopenias (thrombocytopenia, neutropenia, red cell aplasia).
- Rarely, it may lead to fatal bone marrow failure, myelodysplasia, or acute promyelocytic leukemia-like presentations.
- A bleeding diathesis can occur due to thrombocytopenia, impaired platelet function, and acquired von Willebrand disease.
Conclusions:
- Hematologic toxicities are common, variable, and often linked to serum levels >100 microg/mL.
- Most toxicities are reversible with dose reduction; discontinuation is rare.
- Lifelong quarterly laboratory monitoring for thrombocytopenia and leukopenia is recommended.
- Preoperative coagulation studies and potential perioperative DDAVP use are advised for surgical patients.
Purpose:
Sodium valproate is a commonly used anticonvulsant in the management of childhood refractory epilepsy with good response rates and acceptable toxicity. Hepatotoxicity is the most widely recognized toxicity. With the use of higher drug levels to achieve adequate seizure control, hematologic toxicity is being increasingly encountered, and the pediatric hematologist is consulted for these problems in the pre- or perioperative setting. The purpose of this article is to characterize the various hematologic toxicities encountered in a clinical setting and to provide guidelines to assist in the management of these patients.
Methods:
A literature review was undertaken to identify the hematologic toxicities of valproate used as monotherapy or polytherapy. Key words used in the search were valproate, hematology, and bleeding.
Results:
Valproate can cause direct bone marrow suppression leading to aplastic anemia or peripheral cytopenia affecting one or more cell lines. Occasional fatal bone marrow failure, myelodysplasia, and a clinical picture resembling acute promyelocytic leukemia have also been seen. Thrombocytopenia, macrocytosis, neutropenia, and pure red cell aplasia can occur but are not reported to be life-threatening. A bleeding diathesis associated with valproate use may include thrombocytopenia, abnormal platelet function, and acquired von Willebrand disease type I.
Conclusions:
Hematologic toxicities of valproate are common, vary in onset and severity, are recurrent, transient, or persistent, and usually occur with a serum valproate level greater than 100 microg/mL. In most situations, even when highly clinically significant, they can be reversed with dosage reduction; drug discontinuation is rarely required. Potential adverse effects such as thrombocytopenia and leukopenia are easily detected by laboratory monitoring, which should be continued indefinitely at least on a quarterly basis. Caution for elective surgery is advised; preoperative coagulation studies should be done, including platelet function studies and von Willebrand factor levels. Perioperative use of DDAVP to increase von Willebrand factor levels and improve platelet function is appropriate in some cases.