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Theophylline toxicity in term infants
Insights
Theophylline overdoses in 1-month-old infants showed unique pharmacokinetic profiles. Caffeine presence suggests alternative metabolic pathways in young infants, warranting cautious use of theophylline.
Area of Science:
- Pediatric Pharmacology
- Neonatal Toxicology
Background:
- Theophylline is used for respiratory distress in infants.
- Accidental theophylline overdoses in neonates are rare but informative.
Observation:
- Two 1-month-old term infants experienced theophylline overdose during bronchiolitis treatment.
- Both infants recovered without neurological issues.
- Caffeine was detected in serum, though not administered.
Findings:
- Theophylline elimination half-life was 14.5-15.2 hours, longer than in older infants.
- N-methylation may be a key elimination pathway in term infants, unlike older individuals.
- Theophylline's efficacy for bronchiolitis is unproven.
Implications:
- Theophylline should be used cautiously in young infants due to its unique pharmacokinetics.
- Further studies on theophylline metabolism in term infants are needed.
- Alternative metabolic pathways like N-methylation warrant investigation.
Abstract:
The pharmacokinetics of theophylline were studied in 1-month-old term infants who received accidental overdoses of theophylline during treatment for bronchiolitis. Both infants survived without neurologic sequelae. Elimination half-life values of 14.5 and 15.2 hours, respectively, were shorter than reported in premature infants but longer than in infants aged 3 months or older. Caffeine appeared in the sera of both patients, who had not received it in any form. In term infants, elimination of theophylline may occur by N-methylation in contrast to older patients in whom the drug is chiefly eliminated by demethylation and oxidation. Theophylline has not been proved effective for the treatment of bronchiolitis. It should be used with caution for wheezing in very young infants until its pharmacokinetics have been studied further in nontoxic, full-term infants younger than age 3 months.