The Impact of Levetiracetam and Valproate on Platelet Functions—A Double-Blind, Placebo-Controlled Crossover Study
It is known that valproate inhibits platelet functions; however, the exact mechanisms are not clearly identified. We studied 12 healthy adult volunteers (1 female, 11 male; age range 31.7 ± 7.8 years) before and after valproate 500 mg and compared the results to levetiracetam 1000 mg as a control su...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Journal of Clinical Medicine |
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| Online Access: | https://www.mdpi.com/2077-0383/12/3/933 |
| _version_ | 1797624156995452928 |
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| author | Itziar Olaizola Martin F. Brodde Beate E. Kehrel Stefan Evers |
| author_facet | Itziar Olaizola Martin F. Brodde Beate E. Kehrel Stefan Evers |
| author_sort | Itziar Olaizola |
| collection | DOAJ |
| description | It is known that valproate inhibits platelet functions; however, the exact mechanisms are not clearly identified. We studied 12 healthy adult volunteers (1 female, 11 male; age range 31.7 ± 7.8 years) before and after valproate 500 mg and compared the results to levetiracetam 1000 mg as a control substance and placebo. The study had a crossover and double-blind design. A blood sample was taken before and 90 min after medication intake, because the times to maximum serum concentration (T<sub>max</sub>) are 1.5 h for levetiracetam and 1 to 3 h for valproate. We analysed changes in platelet, erythrocyte, and leukocyte cell count and in platelet functions (CD62 expression (P selectin), thrombin binding, and fibrinogen binding). We found no significant differences in all cell counts before and after different study drugs. After valproate intake, but not after placebo or levetiracetam intake, the fibrinogen binding significantly decreased and the CD62 expression significantly increased resulting in decreased platelet aggregation. Our data suggest that the platelet dysfunctions reported for valproate result from decreased fibrinogen binding and from increased CD62 expression. This phenomenon might be one reason for the increased bleeding risk under valproate and cannot be observed for levetiracetam. |
| first_indexed | 2024-03-11T09:39:07Z |
| format | Article |
| id | doaj.art-a0212011c22e40d5b46c4c3abde3dded |
| institution | Directory Open Access Journal |
| issn | 2077-0383 |
| language | English |
| last_indexed | 2024-03-11T09:39:07Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Clinical Medicine |
| spelling | doaj.art-a0212011c22e40d5b46c4c3abde3dded2023-11-16T17:09:18ZengMDPI AGJournal of Clinical Medicine2077-03832023-01-0112393310.3390/jcm12030933The Impact of Levetiracetam and Valproate on Platelet Functions—A Double-Blind, Placebo-Controlled Crossover StudyItziar Olaizola0Martin F. Brodde1Beate E. Kehrel2Stefan Evers3Faculty of Medicine, University of Münster, 48149 Münster, GermanyDepartment of Anaesthesiology and Operative Intensive Care, University of Münster, 48149 Münster, GermanyDepartment of Anaesthesiology and Operative Intensive Care, University of Münster, 48149 Münster, GermanyFaculty of Medicine, University of Münster, 48149 Münster, GermanyIt is known that valproate inhibits platelet functions; however, the exact mechanisms are not clearly identified. We studied 12 healthy adult volunteers (1 female, 11 male; age range 31.7 ± 7.8 years) before and after valproate 500 mg and compared the results to levetiracetam 1000 mg as a control substance and placebo. The study had a crossover and double-blind design. A blood sample was taken before and 90 min after medication intake, because the times to maximum serum concentration (T<sub>max</sub>) are 1.5 h for levetiracetam and 1 to 3 h for valproate. We analysed changes in platelet, erythrocyte, and leukocyte cell count and in platelet functions (CD62 expression (P selectin), thrombin binding, and fibrinogen binding). We found no significant differences in all cell counts before and after different study drugs. After valproate intake, but not after placebo or levetiracetam intake, the fibrinogen binding significantly decreased and the CD62 expression significantly increased resulting in decreased platelet aggregation. Our data suggest that the platelet dysfunctions reported for valproate result from decreased fibrinogen binding and from increased CD62 expression. This phenomenon might be one reason for the increased bleeding risk under valproate and cannot be observed for levetiracetam.https://www.mdpi.com/2077-0383/12/3/933levetiracetamplateletvalproatefibrinogenP-selectin |
| spellingShingle | Itziar Olaizola Martin F. Brodde Beate E. Kehrel Stefan Evers The Impact of Levetiracetam and Valproate on Platelet Functions—A Double-Blind, Placebo-Controlled Crossover Study Journal of Clinical Medicine levetiracetam platelet valproate fibrinogen P-selectin |
| title | The Impact of Levetiracetam and Valproate on Platelet Functions—A Double-Blind, Placebo-Controlled Crossover Study |
| title_full | The Impact of Levetiracetam and Valproate on Platelet Functions—A Double-Blind, Placebo-Controlled Crossover Study |
| title_fullStr | The Impact of Levetiracetam and Valproate on Platelet Functions—A Double-Blind, Placebo-Controlled Crossover Study |
| title_full_unstemmed | The Impact of Levetiracetam and Valproate on Platelet Functions—A Double-Blind, Placebo-Controlled Crossover Study |
| title_short | The Impact of Levetiracetam and Valproate on Platelet Functions—A Double-Blind, Placebo-Controlled Crossover Study |
| title_sort | impact of levetiracetam and valproate on platelet functions a double blind placebo controlled crossover study |
| topic | levetiracetam platelet valproate fibrinogen P-selectin |
| url | https://www.mdpi.com/2077-0383/12/3/933 |
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