title: Effect of valproate on cerebral metabolism and blood flow: an 18F-2-deoxyglucose and 15O water positron emission tomography study.
abstract: We compared the effect of valproate (VPA) on cerebral metabolic rate for glucose (CMRGlc) and cerebral blood flow (CBF), measured with 18F-2-deoxyglucose (18FDG) and 15O water positron emission tomography (PET), in 10 normal volunteers. Mean VPA dose was 17.7 mg/kg, and mean VPA level was 82.1 mg/L (+/-16.5) for 4 weeks. VPA reduced global CMRGlc by 9.4% (9.60 +/- 0.76 vs. 8.59 +/- 1.02 mg Glc/min/100 g, p < 0.05) and regionally in all anatomic areas (p < 0.05 for 11 of 26 areas). VPA diminished global CBF by 14.9% (56.55 +/- 6.70 vs. 47.48 +/- 4.42 ml/min/100 g, p < 0.002) and regionally in all anatomic areas (p < 0.05 for 12 of 26 areas). No significant correlation was noted between VPA level and either global CMRGlc or CBF. The effect of VPA on global CMRGlc is similar to that of carbamazepine (CBZ) and phenytoin but less than that of phenobarbital, valium, or combination therapy with VPA and CBZ. VPA reduced regional CBF (rCBF) but not CMRGlc in the thalamus, an effect that may be associated with VPA's mechanism of action against generalized seizures.
authors.affiliation: Epilepsy Research Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, USA.
authors.forename: W D
authors.initials: WD
authors.lastname: Gaillard
authors.forename: T
authors.initials: T
authors.lastname: Zeffiro
authors.forename: S
authors.initials: S
authors.lastname: Fazilat
authors.forename: C
authors.initials: C
authors.lastname: DeCarli
authors.forename: W H
authors.initials: WH
authors.lastname: Theodore
mesh_terms: D000328:Adult; D001921:Brain / Q000000981:diagnostic imaging / Q000187:drug effects / Q000378:metabolism*; D002220:Carbamazepine / Q000494:pharmacology; D002560:Cerebrovascular Circulation / Q000187:drug effects*; D003847:Deoxyglucose / Q000031:analogs & derivatives; D004305:Dose-Response Relationship, Drug; D004359:Drug Therapy, Combination; D004827:Epilepsy / Q000188:drug therapy / Q000378:metabolism; D005260:Female; D019788:Fluorodeoxyglucose F18; D005947:Glucose / Q000378:metabolism*; D006801:Humans; D008297:Male; D010104:Oxygen Radioisotopes; D010634:Phenobarbital / Q000494:pharmacology; D010672:Phenytoin / Q000494:pharmacology; D014055:Tomography, Emission-Computed; D014635:Valproic Acid / Q000494:pharmacology*; D014867:Water
chemical_list: D010104:Oxygen Radioisotopes; D014867:Water; D019788:Fluorodeoxyglucose F18; D002220:Carbamazepine; D014635:Valproic Acid; D010672:Phenytoin; D003847:Deoxyglucose; D005947:Glucose; D010634:Phenobarbital