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April 13, 2010; 74 (15) Articles

Dyskinesia and the antiparkinsonian response always temporally coincide

A retrospective study

John G. Nutt, Kathy A. Chung, Nicholas H.G. Holford
First published March 10, 2010, DOI: https://doi.org/10.1212/WNL.0b013e3181d90050
John G. Nutt
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Kathy A. Chung
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Nicholas H.G. Holford
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Citation
Dyskinesia and the antiparkinsonian response always temporally coincide
A retrospective study
John G. Nutt, Kathy A. Chung, Nicholas H.G. Holford
Neurology Apr 2010, 74 (15) 1191-1197; DOI: 10.1212/WNL.0b013e3181d90050

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Abstract

Objective: To clinically characterize the temporal relationship between dyskinesia and the antiparkinsonian response when dyskinesia first emerges during long-term levodopa therapy and to determine if it is consistent with the hypothesized mechanism by which dyskinesia develops.

Methods: Dyskinesia and the antiparkinsonian response to levodopa during 2-hour levodopa infusions were monitored at intervals through the first 4 years of long-term levodopa therapy in 20 subjects with idiopathic Parkinson disease (PD) and previously untreated with levodopa. The onset and offset of the antiparkinsonian response and dyskinesia were compared when dyskinesia first appeared during the 4 years. The findings were compared to 20 subjects with PD on long-term levodopa with dyskinesia and motor fluctuations.

Results: The onset and offset of the antiparkinsonian response and dyskinesia generally coincided when dyskinesia first appeared during the 4 years and did not suggest any temporal dissociation of the 2 responses. Further, the latency to the onsets of dyskinesia and the antiparkinsonian response tended to shorten during long-term levodopa therapy, suggesting that both responses were sensitized by long-term levodopa.

Conclusions: The similar onsets and offsets of the antiparkinsonian response and dyskinesia when dyskinesia first appears are not consistent with the postulated progressive decrease in threshold for dyskinesia during long-term levodopa therapy. Other mechanisms for the development of dyskinesia need to be considered.

Glossary

GCRC=
General Clinical Research Center;
OHSU=
Oregon Health & Science University;
PD=
Parkinson disease.
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