Research Mentor Name

Peter A. LeWitt, M.D., M.Med.Sc.

Research Mentor Email Address

a1142@wayne.edu

Institution / Department

Departments of Neurology and Pharmacology, Wayne State University School of Medicine

Document Type

Research Abstract

Research Type

clinicalresearch

Graduate Level Research

no

Abstract

Title

Parkinsonism Induced by Carbon Monoxide Intoxication: A Hidden Gem in the Neurological Literature

Authors

Omer Abdullah [1], B.S.; Peter A. LeWitt, M.D., M.Med.Sc. [1,2] Departments of Neurology and Pharmacology, Wayne State University School of Medicine [1]; Sastry Foundation Endowed Chair in Parkinson Disease Research, Detroit, Michigan, USA [2]

Background

Carbon monoxide (CO) exposure is a well-established cause of central nervous system injury, yet its role in precipitating Parkinsonism remains under-recognized. Early case reports from the 1970s first suggested CO intoxication as a potential cause of secondary Parkinsonism, often linked to bilateral globus pallidus injury. Despite this, the topic has received limited contemporary attention.

Methods

We performed a comprehensive review of historical and contemporary neurological literature, re-evaluated landmark reports, and integrated current clinical, neuroimaging, and epidemiological evidence to examine the relationship between CO exposure and Parkinsonism.

Results

Carbon monoxide exposure, whether acute, delayed, or chronic, can cause parkinsonian motor impairments including bradykinesia, rigidity, gait disturbances, and cognitive deficits, often showing poor responsiveness to levodopa therapy. Neuroimaging consistently demonstrates bilateral pallidal lesions with T2/FLAIR hyperintensities or susceptibility artifacts reflecting necrosis and chronic hemosiderin deposition. Functional imaging shows altered striatal dopaminergic activity, suggesting mechanistic differences from idiopathic Parkinson disease. Large cohort studies indicate that individuals with documented CO exposure have an increased long-term risk of developing Parkinsonism. Interestingly, evidence also suggests that low-dose, chronic CO exposure may exert neuroprotective effects via anti-inflammatory and antioxidant pathways, potentially explaining epidemiological observations such as the reduced Parkinson disease risk among smokers.

Conclusion

This focused appraisal synthesizes historical, clinical, neuroimaging, and epidemiological evidence linking carbon monoxide exposure to Parkinsonism. The findings highlight the under-recognition of CO-induced Parkinsonism and underscore its importance for clinical diagnosis, patient management, and public health awareness.

Disciplines

Medicine and Health Sciences

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