Early infantile developmental and epileptic encephalopathy

Early infantile developmental and epileptic encephalopathy (EIDEE), historically known as Ohtahara syndrome or early infantile epileptic encephalopathy with suppression-burst, is a severe neurological disorder characterized by the onset of intractable seizures within the first few months of life. It is one of the most severe forms of epilepsy, typically presenting with tonic spasms that may occur in clusters, along with a characteristic suppression-burst pattern on electroencephalography (EEG). The condition profoundly affects the central nervous system, leading to severe developmental delay or regression, intellectual disability, and progressive neurological deterioration. Many affected infants may transition to other epileptic syndromes such as West syndrome or Lennox-Gastaut syndrome over time. The causes of early infantile developmental and epileptic encephalopathy are heterogeneous. Structural brain malformations (such as hemimegalencephaly, porencephaly, or cortical dysplasia) and genetic mutations are recognized etiologies. Numerous genes have been implicated, including STXBP1, KCNQ2, SCN2A, ARX, CDKL5, and others, reflecting the broad genetic heterogeneity of this condition. Both de novo dominant mutations and autosomal recessive inheritance patterns have been described depending on the specific genetic cause. Treatment remains largely supportive and symptomatic. Antiseizure medications such as phenobarbital, vigabatrin, and others are used but seizures are frequently refractory to medical therapy. In cases with identifiable structural lesions, epilepsy surgery may be considered. Adrenocorticotropic hormone (ACTH) or ketogenic diet may be tried in some patients. Despite treatment, the prognosis is generally poor, with significant morbidity and mortality. Many children experience profound neurodevelopmental impairment, and some may not survive beyond early childhood.

Common questions about Early infantile developmental and epileptic encephalopathy