Overview
Manganese-induced parkinsonism, also known as manganism, results from chronic occupational exposure to manganese, leading to neurological symptoms resembling idiopathic Parkinson's disease, including motor impairments and cognitive deficits 1.Diagnosis
Clinical Presentation: Tremor, bradykinesia, rigidity, and cognitive impairments such as deficits in processing speed, attention, and working memory 1.
Exposure History: Detailed occupational history focusing on manganese exposure in welding, mining, or ferroalloy production 2.
Neurological Examination: Assessment for parkinsonian features and cognitive function tests 1.
Imaging: MRI may show basal ganglia changes, though not specific 2.
Laboratory Tests: Blood manganese levels can be elevated but are not definitive 2.
Differential Diagnosis: Rule out other causes of parkinsonism such as idiopathic Parkinson's disease, exposure to other neurotoxins 2.Management
Removal from Exposure: Immediate cessation of manganese exposure is crucial 2.
Supportive Care: Physical therapy to manage motor symptoms 2.
Cognitive Rehabilitation: Targeted interventions for cognitive deficits 1.
Pharmacological Interventions: No specific drug class or dose is mentioned in the abstracts; supportive medications for Parkinsonism symptoms may be considered 2.Special Populations
Occupational Groups: Welders and steelworkers are at higher risk; tailored screening protocols recommended 2.
No Specific Data: Limited information on manganism in pregnancy, pediatrics, elderly, or comorbid conditions 12.Key Recommendations
Conduct thorough occupational history to identify manganese exposure risk 2 (Evidence: Expert opinion).
Implement cognitive function assessments in exposed workers to detect early deficits 1 (Evidence: Moderate).
Remove affected individuals from manganese exposure environments immediately upon diagnosis 2 (Evidence: Expert opinion).References
1 Vlasak T, Dujlovic T, Barth A. Manganese exposure and cognitive performance: A meta-analytical approach. Environmental pollution (Barking, Essex : 1987) 2023. link
2 Rutchik JS, Zheng W, Jiang Y, Mo X. How does an occupational neurologist assess welders and steelworkers for a manganese-induced movement disorder? An international team's experiences in Guanxi, China Part II. Journal of occupational and environmental medicine 2012. link