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Neurocognitive outcome after acute disseminated encephalomyelitis
Cecil D Hahn1, Brenda S Miles, Daune L MacGregor
1Division of Neurology, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada.
Pediatric Neurology
|October 29, 2003
Summary
Children with acute disseminated encephalomyelitis (ADEM) may experience mild cognitive deficits, particularly in visuospatial skills, even after full recovery. These neurocognitive sequelae are less severe than those seen in multiple sclerosis.
Area of Science:
- Pediatric Neurology
- Neuroimmunology
- Neuropsychology
Background:
- Cognitive dysfunction is known in multiple sclerosis but understudied in acute disseminated encephalomyelitis (ADEM).
- ADEM involves widespread demyelination, potentially leading to persistent cognitive issues.
- Pediatric ADEM warrants investigation for neurocognitive sequelae.
Purpose of the Study:
- To investigate the profile and severity of cognitive deficits in children following ADEM.
- To compare cognitive outcomes in pediatric ADEM with those in multiple sclerosis.
Main Methods:
- Recruited children aged 6-15 diagnosed with ADEM.
- Conducted structured neurologic assessment, neuropsychological evaluation, and follow-up MRI.
- Analyzed cognitive performance and imaging findings.
Main Results:
- Six children with prior ADEM participated; mean age 7.7 years, mean follow-up 3.5 years.
- As a group, participants performed within the average range on cognitive tests.
- All children showed mild cognitive deficits, especially in visuospatial/visuomotor function, irrespective of MRI normalization.
- Observed deficits were milder than those reported in multiple sclerosis.
Conclusions:
- Pediatric ADEM can result in persistent, though generally mild, cognitive deficits.
- Visuospatial and visuomotor functions appear particularly affected.
- The monophasic nature of ADEM may explain less severe sequelae compared to chronic demyelinating diseases like MS.