[Regression of the cerebellar syndrome under long-term administration of 5-HTP or the combination of 5-HTP and benserazide. 26 cases quantified and treated using computer methods].

A quantitative evaluation of cerebellar ataxia, with an ataxia score (total, static, kinetic) and the measurement of objective values related to the major symptoms, is proposed. 21 patients with heredo-ataxias were treated for 12 months with high doses (16 mg/kg/day) of D-L-5-HTP, L-5-HTP or the association D-L-5-HTP (16 mg/kg/day)-Benserazide(6 mg/kg/day). A computerized processing of the data obtained by regular examination was performed. The ataxia showed a significant regression at the 12th month, mainly in the static performances and in the speed of speech. L-5-HTP appeared to be more active than D-L-5-HTP. The regression of the cerebellar ataxia was also observed in non degenerative conditions such as multiple sclerosis and surgical injury of the anterior lobe vermis, showing that 5-HTP was active on the cerebellar syndrome in general. The regression of the cerebellar ataxia was very slow in inherited diseases and continued for 2 or 4 months after the treatment stopped. A serotoninergic cerebellar control of motricity is discussed.