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- W1982694553 abstract "Summary: The relationship between vigabatrin γ-vinyl GABA (GVG, vigabatrin) daily dosage or steady-state plasma concentrations (CSS), platelet GABA-transaminase (GABA-T) inhibition, and seizure reduction were studied in 16 children with refractory epilepsy. After 2 months of observation and 1 month of single-blind add-on placebo, a fixed GVG dosage was added for 2 months. The dosage was then adjusted in two 2-month periods each, based on the patient's clinical response. In the fixed-dose period, GVG dosages of 56.8 mg/kg/day and CSS of 8.1 mg/L reduced GABA-T activity from 13.9 to 5.1 pmol/min/mg protein (p < 0.001) and that of seizures from 51.4 to 22.3 seizures per month (p < 0.01). Seizure reduction was correlated with dosage (r= 0.83, p < 0.001), but not with CSS or with platelet GABA-T inhibition. After the GVG dose-adjustment periods, in which dosages of 84.4 mg/kg/day and CSS of 10.6 mg/L were reached, only a slight reduction was observed in both GABA-T activity (from 5.1 to 4.9 pmol/min/mg protein) and seizures (from 22.3 to 18.1 seizures per month). In GVG-responsive patients (excluding placebo-sensitive and GVG-resistant patients), a greater reduction of seizures was achieved (from 17.0 to 7.1 seizures per month, p < 0.05), which was not accompanied by greater inhibition of GABA-T. GVG treatment in children should be started with a dosage of 50 mg/kg/day, increased to 75 or even 100 mg/kg/day when a partial response is observed. If seizures do not improve or if they become worse, the patient should be considered resistant and GVG should be discontinued." @default.
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- W1982694553 date "1992-09-01" @default.
- W1982694553 modified "2023-10-18" @default.
- W1982694553 title "gamma-Vinyl GABA (Vigabatrin): Relationship Between Dosage, Plasma Concentrations, Platelet GABA-Transaminase Inhibition, and Seizure Reduction in Epileptic Children" @default.
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- W1982694553 doi "https://doi.org/10.1111/j.1528-1157.1992.tb02202.x" @default.
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