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J Pediatr Endocrinol Metab. 2015 Jan;28(1-2):177-82. doi: 10.1515/jpem-2014-0024.

Effect of l-thyroxine supplementation on infants with transient hypothyroxinemia of prematurity at 18 months of corrected age: randomized clinical trial.

Abstract

OBJECTIVE:

Our objective was to evaluate effects of levothyroxine (l-T4) supplementation against neurodevelopmental outcomes at 18 months of corrected age in very-low-birth-weight (VLBW) infants with hypothyroxinemia but without elevated thyroid-stimulating hormone (TSH) concentration.

METHODS:

VLBW infants who had plasma TSH concentrations <10 μU/mL and free thyroxine (FT4) concentrations <0.8 ng/dL between 2 and 4 weeks of age were enrolled. They were randomly assigned to either the Treated (n=25) or Untreated group (n=45). The Treated group received l-T4 at a dose of 5 μg/kg/day. We compared growth and neurodevelopmental outcomes at 18 months of corrected age in the two groups.

RESULTS:

There were no significant differences in growth, the incidences of developmental delay, cerebral palsy, visual impairment, and hearing impairment in the two groups.

CONCLUSIONS:

In such infants, l-T4 supplementation at a dose of 5 μg/kg/day did not affect FT4 levels and showed no beneficial effect at 18 months of corrected age.

PMID:
25153575
DOI:
10.1515/jpem-2014-0024
[Indexed for MEDLINE]

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