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Related Experiment Videos

Dopaminergic dsyfunction in Tourette syndrome.

H S Singer, I J Butler, L E Tune

    Annals of Neurology
    |October 1, 1982
    PubMed
    Summary

    Haloperidol treatment reduced Tourette syndrome symptoms by 21-88% and normalized cerebrospinal fluid homovanillic acid (CSF HVA) levels. This suggests Tourette syndrome may stem from dopamine receptor hypersensitivity.

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    The treatment of tics.

    Current neurology and neuroscience reports·2002

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Clinical Medicine

    Background:

    • Tourette syndrome is a neurological disorder characterized by involuntary motor and vocal tics.
    • The pathophysiology of Tourette syndrome is not fully understood, but dopaminergic system dysfunction is implicated.

    Purpose of the Study:

    • To investigate the clinical and biochemical effects of haloperidol treatment in patients with Tourette syndrome.
    • To explore the relationship between haloperidol dosage, serum levels, and treatment response.
    • To examine the role of cerebrospinal fluid (CSF) homovanillic acid (HVA) in Tourette syndrome and its response to treatment.

    Main Methods:

    • A prospective study involving seven patients diagnosed with Tourette syndrome.
    • Measurement of CSF HVA and 5-hydroxyindoleacetic acid levels before and during haloperidol treatment.
    • Clinical assessment of symptom severity and recording of side effects.

    Main Results:

    • Haloperidol treatment led to a significant decrease in Tourette syndrome symptoms (21-88%) in all patients.
    • CSF HVA levels increased during treatment, often returning to normal ranges, correlating with clinical improvement.
    • Optimal therapeutic response was observed with serum haloperidol levels between 1-4 ng/ml, though side effects also occurred within this range.

    Conclusions:

    • Haloperidol is an effective treatment for reducing Tourette syndrome symptoms.
    • Increased CSF HVA levels during haloperidol treatment suggest a link between dopamine metabolism and symptom improvement.
    • The findings support the hypothesis that Tourette syndrome may be associated with dopaminergic receptor supersensitivity.

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