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Paroxysmal supraventricular tachycardia during theophylline therapy in a premature infant
Insights
Premature infants may experience supraventricular tachycardia when treated with theophylline. Monitoring theophylline levels is crucial to prevent serious adverse events and toxicity in neonates.
Area of Science:
- Neonatal pharmacology
- Pediatric cardiology
- Clinical toxicology
Background:
- Theophylline is a medication used for respiratory conditions in neonates.
- Premature infants have immature metabolic pathways, affecting drug clearance.
- Understanding theophylline pharmacokinetics is vital for safe and effective treatment.
Observation:
- A 31-week premature infant developed supraventricular tachycardia during theophylline therapy.
- The infant exhibited a prolonged theophylline half-life (24.7 hours) and low clearance (12.7 ml/kg/hour).
- The plasma theophylline concentration reached approximately 42 mg/l at the time of the arrhythmia.
Findings:
- Theophylline accumulation occurred due to the infant's immature drug metabolism.
- High plasma theophylline concentrations correlated with the onset of supraventricular tachycardia.
- The study highlights the risk of serious adverse effects with limited warning signs.
Implications:
- Plasma theophylline concentration monitoring is essential for preventing toxicity in neonates.
- Therapeutic drug monitoring can guide dose adjustments and mitigate risks.
- This case underscores the importance of individualized dosing and pharmacokinetic assessment in premature infants.
Abstract:
An episode of supraventricular tachycardia occurred in an infant born at 31 weeks' gestation after three days of therapy with theophylline 3.5 mg/kg every six hours. The infant had a plasma theophylline half-life of 24.7 hours and a low plasma theophylline clearance of 12.7 ml/kg/hour. The plasma theophylline concentration at the time of the arrhythmia was about 42 mg/l. The extent of drug accumulation with these kinetic characteristics is emphasized. Serious adverse effects due to theophylline may occur with few signs of symptoms of impending toxicity. Plasma theophylline concentration measurements are valuable in avoiding such toxicity.