Progression after chronic manganese exposure.

Abstract:

:We report a longitudinal follow-up study on six patients with chronic manganese-induced parkinsonism following cessation of manganese exposure. Compared with the 1987 study, their parkinsonian symptoms showed a slow progression, particularly in gait disturbances such as freezing during turning and walking backward with retropulsion. The mean disability scores on the King's College Hospital Rating Scale were 15.0 +/- 4.2 in 1987 and 28.3 +/- 6.7 in 1991 (p = 0.003, paired t test). Review of the video records also confirmed a worsening of parkinsonism, especially in difficulty turning. Three of six patients receiving levodopa treatment had an initial improvement. The response decreased after 2 to 3 years. During the therapy, they did not develop on-off fluctuation or dyskinesia. We conclude that patients with manganese-induced parkinsonism may develop increasing neurologic dysfunction long after cessation of exposure and that their responses to levodopa are different from those of patients with Parkinson's disease.

journal_name

Neurology

journal_title

Neurology

authors

Huang CC,Lu CS,Chu NS,Hochberg F,Lilienfeld D,Olanow W,Calne DB

doi

10.1212/wnl.43.8.1479

subject

Has Abstract

pub_date

1993-08-01 00:00:00

pages

1479-83

issue

8

eissn

0028-3878

issn

1526-632X

journal_volume

43

pub_type

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