Hypokinetic-rigid extrapyramidal side effects of neuroleptics: the relationship of the silent period in EMG and HVA and 5-HIAA in CSF.

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Abstract
The relationship between cerebrospinal fluid levels of HVA and 5-HIAA and the hypokinetic-rigid symptoms that occurred during oral administration of haloperidol in twenty schizophrenic patients was investigated. Measurement of the silent period in the EMG was used for evaluation of these syptoms. The results support the hypothesis of a positive correlation between the CSF HVA and the hypokinetic-rigid side effect and a negative correlation between the pretherapeutic dopamine turnover and the risk of neuroleptic Parkinsonism.