Acute Demyelinating Encephalomyelitis: Clinical Characteristics and Outcome

Background: ADEM, although relatively uncommon, is probably under-recognized.

Objectives: To spotlight the clinical profile and therapeutic outcome of children with ADEM.

Materials And Methods: This is a prospective study of patients with ADEM who were admitted to the Pediatric Departments in Aladan and Alfarawanya Hospitals in Kuwait, from January 2009 to January 2011. Clinical, microbiological and radiological data were analyzed.

Results: Of 48 patients presented with acute neurological symptoms and signs, 21 patients fulfilled criteria for ADEM. 80.95% of cases were presenting in winter and spring, 57% of patients had a history of upper respiratory tract illness. The commonest presentations were motor deficits, convulsions and altered consciousness. CSF virology studies showed herpes simplex virus (HSV) and Epstein-Barr virus (EBV) (3 patients) whereas nasal and nasopharyngeal swab showed evidence of influenza H1N1 virus (1 patient). Brain MRI was performed in all patients and revealed multiple hyperintense supratentorial brain lesions on T2/FLAIR images. 85.7% of patients had cortical and/or subcortical white matter lesions which were bilateral and asymmetric in location and size.

Conclusion: ADEM although rare must be considered in children with acute onset of neurological signs and symptoms and must be distinguished from any acute neurological insult.