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Minor neurologic and intellectual impairments have been described in some congenital hypothyroid (CH) children in spite of early detection by neonatal screening. The aim of our study was to assess cognitive functions as well as neurophysiologic parameters in hypothyroid children and to compare children detected by neonatal screening (group A) versus hypothyroid patients clinically diagnosed before the beginning of the screening program (group B). Group A consisted of 15 children (13 girls, mean age at the beginning of treatment 33 d). Group B consisted of 11 patients (7 girls, mean age at the start of treatment 10.1 mo). Twenty age-matched healthy children were studied as a control group for neurophysiologic tests. Neurophysiologic tests (Auditory P 300, long latency somatosensory evoked potentials (LL-SEP) were performed along with IQ evaluation. Abnormalities of neurophysiologic tests were detected in 82% of clinically diagnosed hypothyroid children. Surprisingly, 47% of the children detected by neonatal screening, having normal mental development index, showed at least one abnormal neurophysiologic test. LL-SEP latencies were found significantly increased in both groups of CH patients compared with controls. Our data are suggestive for a prenatal or perinatal CNS damage in some children with congenital hypothyroidism, despite early treatment.

Neurophysiologic Studies and Cognitive Function in Congenital Hypothyroid Children