Aim: To determine the feasibility of discontinuing thyroid hormone treatment earlier than recommended by the current guidelines for congenital hypothyroidism.
Methods: We retrospectively reviewed the medical records of very low-birthweight (VLBW) infants born at Chungbuk National University Hospital from January 2006 to December 2010. Infants were divided into two groups--hypothyroid and normal thyroid--on the basis of the thyroid function test results. Infants in the hypothyroid group were treated with levothyroxine (L-T4) and attempts to discontinue this therapy began when they were about 2 years old.
Results: Of the 216 infants born during the study period, 20 died and 196 were included in the study. Of these, 46 were in the hypothyroid group and 150 were in the normal thyroid group. Thirty-nine infants were taken off L-T4 therapy at around 2 years of age. All were successfully weaned off L-T4 and retained normal thyroid function. Tc-99 m thyroid scans were performed in 32 infants, and no distinct abnormality was noted.
Conclusion: Thyroid dysfunction in VLBW infants was common in our cohort and most cases were transient. Attempts to discontinue this therapy could begin at around the age of two or earlier when low doses of L-T4 have achieved maintenance.
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