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The occurrence of myoclonus in otherwise normal infants and young children during febrile illness is an uncommon and poorly characterized phenomenon.1 Its relation to the more commonly known syndrome of febrile seizures remains undefined. A literature search revealed little information on the subject.1 We describe three children with febrile myoclonus.
Case reports.
Patient 1.
A 12-month-old boy with normal neurodevelopment had intermittent jerks of the whole body beginning 16 hours after the onset of respiratory illness characterized by high fever (104 °F) and cough. The jerks were myoclonic and occurred singly. Similar fever-related jerks had occurred at 10.5 months of age. The family history was negative for myoclonus, febrile convulsions, and epilepsy. Physical examination revealed a fully conscious but febrile child. There were no signs of meningeal irritation. Neurologic examination was normal. Chest examination was remarkable for bilateral diffuse crepitations. The infant experienced 18 to 20 jerks over a period of 24 hours. The myoclonus did not recur after the first 24 hours of hospitalization, although fever persisted for 5 days. Investigations including blood culture …
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