Neuroimaging and neurological outcome of children with acute encephalitis.
Heidi M Pöyhönen, Mikko J Nyman, Ville T Peltola and 2 others
PMID 35527347WHAT IT FOUND
Nearly one third of children had poor long-term recovery after acute encephalitis.
Severe MRI findings and need for ventilator therapy were linked to worse outcomes. A normal early MRI did not guarantee good recovery, as one fifth of those with normal scans still had poor outcomes.
Key findings
01Poor long-term recovery was associated with increasing neuroimaging severity category, need for antiseizure medication, and need for ventilator therapy.
02Ventilator therapy had the strongest association with the degree of disability in multivariate analysis.
03One fifth of patients with normal acute phase MRI had poor outcome at long-term follow-up.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The data were collected retrospectively from medical records, which are prone to human errors in diagnosis recording. The timing of long-term follow-up varied widely from 1 to 23 years, making it difficult to separate encephalitis effects from environmental factors. The study used the original Glasgow Outcome Scale, which measures functional outcome but may not recognize specific postencephalitic cognitive problems. Inclusion criteria required encephalopathy lasting more than 24 hours, which may have excluded milder cases and worsened the overall outcome rates reported. The diagnosis of autoimmune encephalitis varied between patients due to the wide timespan, and autoantibodies were only examined in 12 children, so some cases may have been missed.
Declared interests
The study was funded by the University Foundation, Turku University Hospital, Paulo Foundation, Orion Research Foundation, Foundation for Medical Research, Finnish Medical Foundation, and Finnish Cultural Foundation.
The easy way to misread this
Do not assume that a normal acute phase MRI indicates a good long-term prognosis. One fifth of patients with normal MRI findings in the acute phase still had poor long-term outcomes, so clinical follow-up and functional assessment are necessary regardless of initial imaging results.