Abstract
Inborn error of metabolism may produce a complex clinical picture in which epilepsy is only one of the various neurologic manifestations including developmental delay/regression, mental retardation, and movement disorders. However, metabolic epilepsies may dominate the clinical presentation. A specific diagnosis of metabolic disorders in epileptic patients may provide the possibility of specific treatments that can improve seizures. In a few metabolic diseases such as vitamin-responsive epilepsies, epilepsy responds to specific treatments based on supplementation of cofactors. Certain rare vitamin-responsive inborn errors of metabolism may present as early encephalopathy with anticonvulsant-resistant seizures. These include pyridoxine-dependent seizures, pyridoxal-phosphate-dependent seizures, folinic acid-responsive seizures, and biotinidase deficiency. This review discusses our current understanding of these vitamin-responsive epilepsies.
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