Treatment of infantile spasms with synthetic ACTHTen infants with infantile spasms (IS) and hypsarrhytmic EEC, received 0.5 mg i.m. of synthetic ACTH, three times a week for 2 weeks. Six of them showed complete remission of seizures and dramatical EEG changes, and 3 cases resulted in a partial response. Spasms were controlled during the first week in 5/6 cases where treatment was successful. A significant relationship was observed between treatment precocity and favourable outcome (Fisher p < 0.02). Synthetic ACTH treatment did not produce severe side effects in any patient. During follow up (X 6.2 m) relapse occurred in one case, with 5 patients maintaining the initial positive response and a normal or mildely retarded psychomotor development. The other five patients show severe psychomotor retardation and intractable spasms and/or other seizures. Future research should focuse on the efficacy of other treatment schedules, equilibrating success and side effects. Los espasmos masivos (EM) son una forma severa de epilepsia del lactante, refractaria al tratamiento con los anticonvulsivantes habituales. Hace 30 afios se descubrio la eficacia de la corticotropina (ACTH) para controlar las crisis y mejorar el trazado electroencefalografico 1 . Desde entonces se han empleado diferentes formas de tratamiento con ACTH y esteroides orales, obteniendose una amplia variedad de resultados. Aunque en la actualidad el farmaco mas ampliamente aceptado es el ACTH natural gel, ACTH de origen animal de efecto prolongado, existe confusion en cuanto a dosis, esquema y duration de tratamiento 2 ' 3 ' 4 . Son factores claves en esta fait a de consenso, una escasez de estudios prospectivos bien controlados y la divers idad de criterios empleados para evaluar la respuesta a tratamiento 5 . Estudios bien controlados demuestran que al administrar ACTH gel por periodos de un mes, se logra control complete de las crisis en 70% de los casos 6 . Este planteamiento tiene
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