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Postmortem studies on posthypoxic and post-methyl bromide intoxication: case reports
Abstract:
In two cases of action myoclonus following hypoxic or shock encephalopathy, neuropathological examination disclosed mild or moderate scattered changes involving thalamus, griseum centrale mesencephali, and nucleus centralis superior. Other areas were affected only in one of these cases (striatum, nucleus subthalamicus or hippocampus, nuclei pontis, and cerebellar cortex). In another case (an alcoholic patient), the changes, which involved only corpus mamillare and thalamus, were those of Wernicke-Korsakoff encephalopathy. In one case of oscillatory myoclonus following septic shock, there were marked cerebellar changes involving deep nuclei and mild abnormalities in the thalamus and inferior olive. The last case of action myoclonus following acute methyl bromide intoxication was characterized by marked changes in the inferior colliculi and moderate or mild abnormalities of thalamus, griseum centrale mesencephali, nucleus centralis superior, nucleus reticularis tegmenti pontis, nuclei pontis, and dentatus. The findings are compared with the data of seven previously reported neuropathological examinations in action myoclonus following hypoxic encephalopathy.
Insights
Neuropathological examination of action myoclonus reveals brainstem and thalamic changes. Specific lesions vary by cause, including hypoxic encephalopathy, Wernicke-Korsakoff, septic shock, and methyl bromide intoxication.
Area of Science:
- Neurology
- Neuroscience
- Pathology
Background:
- Action myoclonus is an involuntary muscle jerking that can occur after various brain injuries.
- Understanding the neuropathological basis of action myoclonus is crucial for diagnosis and treatment.
Observation:
- Neuropathological examination of five action myoclonus cases revealed distinct patterns of brain damage.
- Commonly affected areas included the thalamus, mesencephalic central gray, and pontine central superior nucleus.
- Specific etiologies like hypoxic encephalopathy, Wernicke-Korsakoff, septic shock, and methyl bromide intoxication showed unique lesion distributions.
Findings:
- Hypoxic encephalopathy cases showed scattered thalamic and brainstem changes.
- Wernicke-Korsakoff encephalopathy involved the mammillary bodies and thalamus.
- Septic shock led to cerebellar and thalamic abnormalities.
- Methyl bromide intoxication caused significant inferior colliculi damage alongside thalamic and brainstem lesions.
Implications:
- These findings highlight the diverse neuropathological substrates underlying action myoclonus.
- Identifying specific lesion patterns may aid in determining the cause of myoclonus.
- Further research can correlate these pathological findings with clinical symptoms and treatment outcomes.