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Increased mortality in neonates with low thyroxine values

T D Marsh1, D Freeman, R E McKeown

  • 1Division of Neonatology, University of South Carolina School of Medicine 29203.

Journal of Perinatology : Official Journal of the California Perinatal Association
|May 1, 1993
PubMed
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Low serum thyroxine levels in premature or low birth weight infants indicate a significantly higher risk of mortality. Monitoring thyroxine is crucial for identifying neonates needing closer medical attention.

Area of Science:

  • Neonatal Medicine
  • Endocrinology
  • Pediatric Critical Care

Background:

  • Premature and low birth weight neonates are at increased risk for various complications.
  • Thyroid hormone plays a vital role in neonatal development and metabolic regulation.
  • Suboptimal thyroid function can impact outcomes in vulnerable infant populations.

Purpose of the Study:

  • To investigate the relationship between serum thyroxine levels and mortality in high-risk newborns.
  • To identify a potential critical thyroxine threshold associated with increased neonatal mortality.

Main Methods:

  • Prospective study of 97 neonates with birth weight < 2200 gm or gestational age < 37 weeks over 6 months.
  • Serum thyroxine levels were measured.
  • Mortality rates were compared between infants with thyroxine levels below and above a defined threshold.

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Main Results:

  • A total of 89 infants survived, and 8 infants died during the study period.
  • Infants with serum thyroxine values below 2.5 micrograms/dl (32.2 nmol/L) exhibited a significantly higher mortality rate (p < 0.001).
  • This finding suggests a critical lower limit for thyroxine levels associated with increased mortality risk.

Conclusions:

  • A critical serum thyroxine value may exist in neonates, below which the risk of mortality is elevated.
  • Thyroxine monitoring could be a valuable tool for risk stratification in high-risk neonatal populations.
  • Early identification of low thyroxine levels may guide timely interventions to improve neonatal outcomes.