Perfiles cognitivos en pacientes con hipotiroidismo congénito detectado y tratado en forma temprana

Abstract

Introducción: Los niños con hipotiroidismo congénito (HC) detectados por pesquisa neonatal y tratados adecuadamente presentarían defectos cognitivos leves. Objetivos: Evaluar el coeficiente intelectual de niños con HC e identificar la presencia de déficits cognitivos específicos. Población y métodos. Se seleccionó un grupo de 60 niños con HC, de entre 9 y 10 años, detectados por pesquisa neonatal y tratados adecuadamente desde el primer mes de vida, y se comparó con un grupo control de 60 niños sin HC de la misma edad. Fueron criterios de inclusión la ausencia de patología intercurrente, concurrencia a jornada escolar simple y padres con nivel escolar mínimo de secundaria completa. En entrevistas individuales, se administraron la escala de inteligencia Wechsler para niños, tercera edición, figura compleja de Rey, test WoodcockMuñoz revisado, Conners Continuous Performance Test II, test Illinois de aptitudes psicolingüísticas, test de fluidez verbal, test de cubos de Knox, Trail Making Test, test de caras y test de los 5 dígitos. Se realizó el análisis estadístico con pruebas t de Student (muestras independientes) ajustado por Bonferroni (p < 0,002). Resultados: Aun dentro del rango normal promedio, hubo diferencias significativas entre grupos en el coeficiente intelectual total y de ejecución (tamaño del efecto pequeño y moderado, respectivamente). Los niños hipotiroideos presentaron, en el área de ejecución, significativamente menor desempeño en velocidad de procesamiento, tiempos de reacción, atención, flexibilidad cognitiva, visoconstrucción y memoria a largo plazo. No hubo diferencia significativa entre grupos en el área verbal. Conclusiones: Los niños hipotiroideos congénitos, sin discapacidad mental, presentaron defectos cognitivos leves, que deben ser tenidos en cuenta para su atención integral.

Introduction: Children with congenital hypothyroidism (CH) detected by newborn screening and adequately treated may have mild cognitive deficits. Objectives: To assess the intelligence quotient of children with CH and identify the presence of specific cognitive deficits. Population and methods. A group of 60 children with CH detected by newborn screening, who were aged 9-10 years old and received adequate treatment since their first month of life was selected and compared to a control group of 60 children without CH in the same age range. Inclusion criteria: children without concurrent diseases, who were attending school in a single shift, and whose parents had at least completed secondary education. The following tests were administered during individual interviews: the Wechsler Intelligence Scale for Children (third edition), the Rey complex figure test, the Woodcock-Muñoz revised test, the Conners Continuous Performance Test II, the Illinois Test of Psycholinguistic Abilities, the verbal fluency test, the Knox Cube Test, the Trail Making Test, the faces test, and the 5 digit test. The statistical analysis was done using Student’s t tests (for independent samples) with Bonferron: Even within the normal average range, significant differences were observed between both groups in terms of total intelligence quotient and performance intelligence quotient (small and moderate effect sizes, respectively). In terms of performance, children with hypothyroidism had a significantly poorer performance in processing speed, reaction times, attention, cognitive flexibility, visuoconstruction, and long-term memory. No significant differences were found between both groups in the verbal area. Conclusions: Children with congenital hypothyroidism and without mental disability had mild cognitive deficits, which should be taken into account for a comprehensive patient care.