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Intraindividual changes in theophylline clearance during constant aminophylline infusion in children with acute
Insights
Theophylline clearance significantly increases during a 72-hour intravenous aminophylline infusion in children with acute asthma. Frequent monitoring of theophylline levels and adjusted infusion rates are recommended for effective pediatric asthma management.
Area of Science:
- Pediatric Pulmonology
- Clinical Pharmacology
Background:
- Acute asthma exacerbations in children often require intravenous aminophylline therapy.
- Theophylline pharmacokinetics, particularly clearance, can be variable in pediatric patients.
Purpose of the Study:
- To investigate intraindividual changes in theophylline clearance during a continuous intravenous aminophylline infusion in pediatric asthma patients.
- To determine if significant variations in theophylline clearance occur over a 72-hour treatment period.
Main Methods:
- A cohort of 13 children with acute asthma exacerbations received a 72-hour constant intravenous infusion of aminophylline.
- Theophylline clearance was measured at three time points: 24, 48, and 72 hours after infusion initiation.
Main Results:
- Theophylline clearance showed a statistically significant increase from the first measurement (24 hours) to the second (48 hours) and third (72 hours) measurements.
- Mean theophylline clearance increased progressively throughout the 72-hour infusion period, indicating dynamic changes in drug metabolism.
Conclusions:
- Substantial intraindividual variations in theophylline clearance can occur rapidly during intravenous aminophylline therapy for acute pediatric asthma.
- Frequent monitoring of plasma theophylline concentrations and dynamic adjustment of aminophylline infusion rates are crucial for optimizing treatment in pediatric asthma patients.
Abstract:
Intraindividual changes in theophylline clearance were examined in 13 children with acute exacerbation of asthma receiving a 72-hour constant intravenous infusion of aminophylline. The mean (+/- SD) first, second, and third clearances measured at 24, 48, and 72 hours after the infusion increased from 58.1 +/- 13.8 to 69.7 +/- 28.0 to 84.1 +/- 36.3 ml/hr/kg, respectively (P less than 0.02 from the first and P less than 0.05 from the second). Our results suggest that substantial intraindividual changes in theophylline clearance can occur over a rather short time during intravenously administered aminophylline therapy for acute asthma in children. We recommend that plasma theophylline concentrations be monitored frequently and that aminophylline infusion rate be adjusted on the basis of the measured theophylline concentration data during an acute episode of asthma in the pediatric patient.