The effects of L-threo-3,4-dihydroxyphenylserine on the total norepinephrine and dopamine concentrations in the cerebrospinal fluid and freezing gait in parkinsonian patients

  • H. Tohgi
  • T. Abe
  • S. Takahashi
Full Papers

Summary

We studied the effects of L-threo-DOPS (L-DOPS) on the concentrations of total (conjugated and unconjugated) dopamine (DA) and norepinephrine (NE) in the cerebrospinal fluid (CSF) of parkinsonian patients with freezing phenomenon. The NE concentration increased remarkably and dose-dependently after administration of L-DOPS in both L-dopa/carbidopa-pretreated and untreated patients. The DA concentration also increased mildly but significantly in L-dopa/carbidopa-untreated patients. Freezing phenomenon improved in 6 out of 8 patients at Hoehn and Yahr's stage III, and 1 out of 5 patients at stage IV. These results indicate that L-DOPS administration increases the NE concentration dosedependently, and is effective for freezing of gait of moderate severity.

Keywords

L-threo-DOPS freezing of gait norepinephrine dopamine cerebrospinal fluid 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • H. Tohgi
    • 1
  • T. Abe
    • 1
  • S. Takahashi
    • 1
  1. 1.Department of NeurologyIwate Medical UniversityMoriokaJapan

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