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Neurology. 2004 Mar 9;62(5):730-3.

Effect of levodopa treatment for parkinsonism in welders: A double-blind study.

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Department of Neurology, The Mount Sinai School of Medicine, New York, NY, USA.



Manganese is known to cause a parkinsonian syndrome similar clinically to Parkinson disease (PD). L-Dopa responsiveness is a hallmark of PD; however, L-dopa's effect on manganese-induced parkinsonism is not well defined.


To access the efficacy and safety of L-dopa therapy in a double-blind, randomized, placebo-controlled trial.


Thirteen patients with manganese-induced parkinsonism were evaluated in a cross-over study with a modified Unified PD Rating Scale (UPDRS), timed walk test, tapping, and global clinical impression scores. Adverse reactions were assessed.


There was no significant difference between placebo and L-dopa for any measure: motor UPDRS, 27.4 vs 28.8; walk time, 16.6 seconds vs 17.7 seconds; tapping right hand, 69.5 vs 64.7; and tapping left hand, 66.8 vs 64.4. There were no differences in the global impression scores. Adverse reactions occurred similarly in the two groups, including headaches, drowsiness, and diarrhea.


L-Dopa therapy is not effective for the management of parkinsonism in welders. L-dopa unresponsiveness may be useful to distinguish manganese-induced parkinsonism from Parkinson disease.

[Indexed for MEDLINE]

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