To evaluate the effects of levothyroxine (L-T4) supplementation on growth and neurodevelopmental outcomes at 3 years of age in very low birth weight (VLBW) infants with transient hypothyroxinemia of prematurity (THOP).STUDY DESIGN:
VLBW infants with plasma thyroid-stimulating hormone concentrations < 10 mIU l-1 and free thyroxine concentrations < 0.8 ng dl-1 were defined as having THOP and randomly assigned to the Treated (20 infants) or Untreated (31 infants) group. The Treated group received L-T4 at a dose of 5 μg kg-1 day-1. Growth and neurodevelopmental outcomes at 3 years of age were compared between the two groups.RESULTS:
There were no significant differences in body length, body weight or head circumference mean s.d. scores or in neurodevelopmental outcomes between the two groups.CONCLUSION:
L-T4 supplementation in VLBW infants with THOP demonstrated no beneficial effect at 3 years of age.