The relationship between pharmacodynamics and pharmacokinetics in asthmatic children receiving a sustained-release formulation of theophylline
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Long-term theophylline treatment in children shows a consistent bronchodilating effect, with respiratory improvements noted compared to pre-treatment levels. Serum theophylline concentrations did not strongly correlate with these respiratory changes during steady-state treatment.
Area of Science:
- Pediatric Pulmonology
- Pharmacology
- Respiratory Medicine
Background:
- Theophylline is a common medication for managing pediatric respiratory conditions.
- Understanding the relationship between theophylline levels and bronchodilator effects is crucial for optimizing treatment.
Purpose of the Study:
- To evaluate the pharmacodynamic response to long-term theophylline treatment in children.
- To assess the correlation between serum theophylline concentrations and respiratory parameters.
Main Methods:
- 15 children on long-term theophylline therapy were monitored.
- Serum and saliva theophylline concentrations were measured.
- Respiratory parameters (vital capacity, bronchial resistance) were assessed using bodyplethysmography before and during steady-state treatment.
Main Results:
- Significant improvements in respiratory parameters were observed compared to pre-treatment values.
- No significant correlation was found between serum theophylline concentrations and respiratory parameters during steady-state treatment.
- Theophylline demonstrated a consistent bronchodilating influence, minimally dependent on achieved concentration ranges.
Conclusions:
- Theophylline provides a stable bronchodilating effect in children during long-term therapy.
- Respiratory improvements are evident, though not directly correlated with specific serum concentration fluctuations in the steady state.
Abstract:
Pharmacodynamic response as well as serum and saliva concentrations of theophylline were monitored in 15 children under a long term theophylline treatment. Respiratory parameters, such as vital capacity and total bronchial resistance all related to bronchodilatation, were measured by use of a bodyplethysmograph. Measurements were performed before treatment and during the steady state with respect to serum levels. Due to small differences between peak and trough concentrations, no correlations between serum concentrations and respiratory parameters were found during the steady state. However, some important respiratory parameters exhibit considerable differences with respect to pretreatment values. In conclusion, one can state that during the steady state, theophylline exerts a constant influence on bronchodilatation which depends only slightly on the concentration range achieved.