Levothyroxine Treatment for Congenital Hypothyroidism Based on Thyroid Function: A 10-Year Clinical Cohort Retrospective Study
Abstract ObjectiveTo explore the appropriate dosage of levothyroxine treatment for congenital hypothyroidism patients based on thyroid function.Methods116 patients who were regularly followed up in our endocrine clinic during January 2010 to December 2020 were allocated in 4 groups in terms of their thyroid function (group A: TSH ≥ 100mIU/L, group B: 20mIU/L ≤ TSH<100mIU/L, group C: 4.6mIU/L<TSH<20mIU/L while free thyroxine (FT4)<6.6pmol/L, group D: 4.6<TSH<20mIU/ while FT4>6.6pmol/L). The initial dosage of levothyroxine was individualized given to each patient based upon their TSH level and adjusted according to their thyroid function at every follow-up time point. The levothyroxine dosage at each time point of groups was compared, the thyroid function after treatment, physical and neurological development of different groups were also assessed.ResultsExcept for the first month after initial levothyroxine treatment, there was a statistical difference in thyroid function between groups (p < 0.05), and some patients hadn’t reached the normal level, in the following time points, after individualized dosage adjustment, all patients achieved the normal thyroid function, moreover, the difference of levothyroxine dosage was significant between four groups (p < 0.05) and positively correlated with the severity of disease. Although there were statistical differences in neurological development between groups (p < 0.05), they were all within the normal range.ConclusionCompared to recommend dosage, individualized Levothyroxine dosage could also obtain the same therapeutic effect while may reduce the risk of drug overdose.