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Results of magnetic resonance imaging in long-term manganese dioxide-exposed workers.

Abstract：

:Within a cross-sectional study, the neurotoxic effects of occupational exposure to manganese were examined. From a group of 90 (58 male and 32 female) workers, 11 men with long-term and high exposure to manganese dioxide (MnO2) dust were defined as exposed workers. Eleven age-matched workers of similar socioeconomic status were used as a reference group. Ambient air and biological monitoring (blood, urine, hair), clinical (Webster Rating Scale, WRS), neurophysiological (visual evoked potentials (VEP), nerve conduction velocity (NCV), electroencephalography (EEG)), and motor performance (Wiener Testsystem) examinations were performed. The pallidal index (PI), the ratio of globus pallidus to subcortical frontal white-matter signal intensity in T1-weighted magnetic resonance imaging (MRI) planes multiplied by 100, was used. For the individual body burden, manganese in blood was the most reliable biomarker. A "job-exposure matrix" for the cumulative Mn-exposure index (CEI) was calculated for each worker. The results of WRS, VEP, NCV, EEG, and motor performance tests showed no significant group differences. However, the pallidal index was increased in Mn-exposed persons. Furthermore, a statistically significant positive correlation was found between CEI and pallidal index. The results of other studies are discussed. The meaning of MRI findings for health status as well as gender-specific differences should be examined in further follow-up studies.

journal_name

Environ Res

journal_title

Environmental research

authors

Dietz MC,Ihrig A,Wrazidlo W,Bader M,Jansen O,Triebig G

doi

10.1006/enrs.2000.4068

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

37-40

issue

1

eissn

0013-9351

issn

1096-0953

pii

S0013-9351(00)94068-4

journal_volume

85

pub_type

杂志文章

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