Some success in controlling seizures has been reported with the ketogenic diet in Ohtahara syndrome, but not in early myoclonic encephalopathy [3] and [51]. The correction of underlying metabolic disorders may lead to more favorable outcomes. In particular, patients with Ohtahara syndrome have been reported to do relatively well after the correction of underlying pyridoxine deficiencies [11] or biotinidase deficiencies [23]. In cases of early myoclonic
encephalopathy associated with nonketotic hyperglycinemia, treatment with sodium benzoate, ketamine, and dextromethorphan has been used, sometimes in combination with this website tryptophan, strychnine, or imipramine [41], [52] and [53]. These treatments can improve the neonatal course, but do not seem to affect long-term outcomes [53]. Cases with operable structural abnormalities such as hemimegalencephaly or cortical dysplasia can benefit from neurosurgical intervention with focal resection or hemispherectomy [54]. Early myoclonic encephalopathy and Ohtahara syndrome share many features, including age at presentation, a similar electroencephalographic pattern, intractable seizures, and poor prognosis. Tonic seizures and focal motor seizures are frequently observed in both syndromes. Thus differentiating between the two conditions can be difficult, especially early in their course, and they have been
conceptualized by some as part of the same continuum of disease [34] and [36]. In 2006, Ohtahara and Yamatogi [9] highlighted the differences between the syndromes, indicating that they were separate and distinguishable find more diseases (Table 1). Specifically, they pointed out the prevalence of structural abnormalities in Ohtahara syndrome vs metabolic disease in early myoclonic encephalopathy, and emphasized that the suppression burst pattern is present equally in wakefulness and sleep in Ohtahara syndrome, whereas it is either exclusively present Leukotriene-A4 hydrolase during sleep or more distinct during sleep
in early myoclonic encephalopathy. Furthermore, the evolution of disease can differ. Ohtahara syndrome can progress to West syndrome and then to Lennox-Gastaut syndrome, or can transition to severe focal epilepsy. Early myoclonic encephalopathy typically remains unchanged for years or transiently evolves to an atypical hypsarrhythmia pattern, which is thought to differ significantly from typical West syndrome in terms of seizure type and atypical electroencephalographic findings. Finally, Ohtahara and Yamatogi [9] emphasized that although some seizure types do overlap between the two syndromes, tonic spasms are the first seizure type observed in Ohtahara syndrome, whereas focal seizures and erratic myoclonus occur first in early myoclonic encephalopathy [9]. Although these differences are helpful in differentiating between the two conditions in their purest forms, considerable clinical overlap may still occur in practice.
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