Salivary theophylline estimation in the management of asthma in children

Area of Science:

• Pharmacology
• Clinical Chemistry
• Pediatric Pulmonology

Background:

• Theophylline is a common medication for managing childhood asthma.
• Monitoring theophylline plasma concentrations is crucial for therapeutic efficacy and safety.
• Blood sampling for plasma monitoring can be invasive and uncomfortable for pediatric patients.

Purpose of the Study:

• To investigate the potential of using saliva as a non-invasive alternative to plasma for monitoring theophylline dosages in children with asthma.
• To establish the correlation between saliva and plasma theophylline concentrations.
• To determine the clinical utility of saliva theophylline levels in routine outpatient visits.

Main Methods:

• Simultaneous saliva and plasma samples were collected from 48 children with moderate to severe asthma receiving oral theophylline.
• Theophylline concentrations in both saliva and plasma were measured.
• The relationship between saliva and plasma theophylline levels was analyzed.

Main Results:

• Saliva and plasma theophylline concentrations exhibited significant inter-individual variability.
• Saliva theophylline concentrations below 7 µg/ml correlated with plasma concentrations below 10 µg/ml (sub-therapeutic).
• Saliva theophylline concentrations above 7 µg/ml were consistent with therapeutic plasma dosage ranges.

Conclusions:

• Saliva theophylline concentration estimation is a viable, non-invasive method for monitoring therapeutic drug levels in pediatric asthma patients.
• This approach can help identify sub-therapeutic or therapeutic theophylline dosages without the need for blood collection.
• Saliva monitoring can aid in adjusting dosages and assessing patient compliance with theophylline therapy.