INFLUENCE OF TREATMENT ON THE MATURATION OF THE SOMATESTHETIC PATHWAYIN INFANTS WITH PRIMARY CONGENITAL HYPOTHYROIDISM DURING THE 1ST YEAROF LIFE

To assess the influence of treatment on the development of the somesth etic pathway in infants with congenital hypothyroidism receiving early treatment, median nerve somatosensory evoked potentials were measured during the 1st y of life. Twenty-nine infants were studied with six t o seven somatosensory evoked potential tests per infant. The cervical latency (N13) divided by arm length and the first (N19) and second (N3 2) cephalic latencies as well as N13-N32 latency were measured. At dia gnosis, all components showed a small but significant delay, which was not related to thyroxine (T4) levels before treatment. During treatme nt, T4 ranged from 50 to 290 nmol/L. At 12 mo, the cervical latency di vided by arm length had normalized, whereas N19 and N13-N32 were more abnormal than at diagnosis. For N19, these abnormalities were related to a slow initial rise of T4 (less-than-or-equal-to 100 nmol/L after 1 wk of treatment) and the initial N19 values. Abnormal N13-N32 values were associated with high T4 values during treatment (>200 nmol/L) and the type of congenital hypothyroidism (partial or total deficiency in T4 production). Induction of therapy with l-triiodothyronine rather t han l-thyroxine and the occurrence of low T4 values (<100 nmol/L) afte r the 4th wk of therapy had no such effect. Our data suggest that, for normal CNS development, euthyroidism should be reached as soon as pos sible by adequate induction therapy. Thereafter, T4 supplementation sh ould be strictly dosed, keeping the serum T4 values within narrow limi ts around the mean normal for age, because overtreatment, like initial undertreatment, may lead to CNS abnormalities at the end of the first year.