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Summary
Patient variability in theophylline clearance can exceed 50%, leading to unpredictable serum concentrations. Respiratory infections significantly reduce theophylline clearance in adults.
Area of Science:
- Pharmacokinetics
- Internal Medicine
- Respiratory Medicine
Background:
- Theophylline is a critical medication for managing respiratory conditions.
- Significant inter-individual variability in theophylline pharmacokinetics is observed in adult patients.
- Factors influencing theophylline clearance require further investigation for optimal therapeutic drug monitoring.
Purpose of the Study:
- To investigate the impact of patient-specific factors on theophylline clearance.
- To quantify the variability in serum theophylline concentrations.
- To assess the effect of respiratory infections on theophylline clearance.
Main Methods:
- Analysis of patient data to determine theophylline clearance rates.
- Comparison of predicted versus actual serum theophylline concentrations.
- Evaluation of clearance in patients with various respiratory conditions.
Main Results:
- Inter-patient variability in theophylline clearance can exceed 50%.
- A standard theophylline dose may result in serum concentrations ranging from 6.6 to 33 µg/ml (predicted 15 µg/ml).
- Acute and chronic respiratory infections (viral URIs, pneumonia, COPD) significantly decrease theophylline clearance.
Conclusions:
- High inter-individual variability in theophylline clearance necessitates careful dosage individualization.
- Respiratory infections are identified as a significant factor adversely affecting theophylline clearance.
- Therapeutic drug monitoring is crucial in adult patients, especially those with respiratory infections, to ensure optimal theophylline efficacy and safety.