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Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
Published on: November 19, 2012
Neuropsychological deficits after bithalamic hemorrhages
D Kuljic-Obradovic1, G Labudovic, N Basurovic
1Sveti Sava Hospital, Nemanjina 2, 11000 Belgrade, Serbia and Montenegro. svsava@sezampro.yu
Journal of the Neurological Sciences
|March 30, 2007
Summary
Bilateral thalamic hemorrhages can cause significant cognitive impairment, including moderate dementia and memory deficits. This case highlights the long-term effects on attention, memory, and executive functions due to disrupted cortico-thalamic pathways.
Area of Science:
- Neuroscience
- Neurology
- Cognitive Psychology
Background:
- Thalamic lesions significantly impact cognitive functions, leading to complex neuropsychological symptoms.
- Bilateral, simultaneous thalamic hemorrhages are rare causes of thalamic dementia.
Observation:
- A patient developed coma post-surgery for hemorrhagic pancreatitis, with brain imaging revealing bilateral thalamic hematomas.
- Over 12 months, consciousness improved, but moderate dementia (MMSE 20/30) persisted, marked by severe disorientation, attention deficits, and memory impairments (anterograde and retrograde amnesia, confabulations).
Findings:
- Neuropsychological assessment revealed prominent impairments in attention, concentration, verbal memory, and executive functions, including cognitive inflexibility and dysexecutive syndrome.
- Specific deficits included dynamic apraxia, visual-spatial difficulties, and reduced verbal fluency. Language impairment was primarily anomia.
- While retrograde amnesia showed moderate improvement after a year, anterograde deficits remained significant.
Implications:
- The observed neuropsychological profile is characteristic of subcortico-cortical cognitive deficits.
- These deficits result from the disruption of crucial cortico-thalamic circuitry caused by bilateral thalamic hemorrhages.
- This case underscores the thalamus's critical role in maintaining cognitive functions and the long-lasting consequences of bilateral hemorrhagic damage.
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