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Acute thyroxine ingestion in pediatric patients
W J Lewander1, P G Lacouture, J E Silva
1Department of Pediatrics, Rhode Island Hospital Brown University Medical School, Providence 02902.
Pediatrics
|August 1, 1989
Summary
Acute pediatric thyroxine (T4) overdose is often not severe, with most cases manageable outpatient. Initial T4 levels, not early symptoms, predict potential toxicity, which typically resolves within 60 hours.
Area of Science:
- Pediatric Endocrinology
- Clinical Toxicology
Background:
- Acute thyroxine (T4) overdose in children presents a clinical challenge.
- Understanding T4 pharmacokinetics and toxicity is crucial for effective management.
Purpose of the Study:
- To investigate the clinical course and outcomes of acute pediatric thyroxine overdose.
- To identify predictors of toxicity and characterize T4 and triiodothyronine elimination half-lives.
Main Methods:
- Retrospective analysis of 15 pediatric cases of acute T4 overdose with documented serum T4.
- Clinical examination within 1-6 hours of ingestion.
- Serial serum T4 and triiodothyronine measurements to determine elimination half-lives.
Main Results:
- Most pediatric patients (15 cases) were asymptomatic upon initial examination.
- Three patients with initial T4 > 75 µg/dL developed transient toxicity (fever, tachycardia, hypertension).
- Mean T4 elimination half-life was 2.8 days; triiodothyronine half-life was 6 days.
Conclusions:
- The majority of pediatric T4 overdoses are mild and suitable for outpatient management.
- Initial serum T4 concentrations are better predictors of toxicity than early clinical signs.
- T4 elimination half-life is shorter, and triiodothyronine half-life is longer in overdose compared to therapeutic use.