[Correlation of clinico-physiologic indices and the serotonin content of the blood of patients with parkinsonism].

On withdrawal of L-DOPA-containing drugs the blood serotonin content decreased in parkinsonism patients irrespective of form and etiology of the disease. L-DOPA-containing drugs caused the blood serotonin levels to rise. Substantial correlations of the blood serotonin levels and clinico-physiologic indices were found mostly in postencephalitic parkinsonism.