Severe chorea after acute carbon monoxide poisoning

Area of Science:

• Neurology
• Toxicology
• Neuroimaging

Background:

• Carbon monoxide (CO) poisoning is a common environmental hazard.
• Neurological sequelae of CO poisoning can include movement disorders.
• Chorea is a hyperkinetic movement disorder characterized by involuntary, irregular, and purposeless movements.

Observation:

• A 33-year-old woman developed severe chorea 10 days after acute carbon monoxide exposure.
• Cerebral computed tomography (CT) scans revealed bilateral lucencies in the pallidum and anterior limb of the internal capsule.
• The patient's chorea significantly improved with chlorpromazine treatment.

Findings:

• The observed neurological deficits, specifically chorea, correlated with specific brain imaging findings (pallidal and internal capsule lucencies).
• Chlorpromazine effectively managed the choreiform movements.
• The chorea did not recur after discontinuation of chlorpromazine therapy.

Implications:

• This case suggests a potential link between carbon monoxide-induced pallidal and internal capsule damage and the development of chorea.
• Chlorpromazine may be an effective treatment option for chorea secondary to carbon monoxide poisoning.
• Further research into the neurotoxic mechanisms of carbon monoxide and its impact on basal ganglia function is warranted.