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Correlation between the saliva and free serum concentration of phenobarbital in epileptic children
Insights
Saliva phenobarbital (PB) levels closely correlate with total and free serum concentrations in epileptic children. Monitoring salivary PB offers a practical approach for epilepsy management.
Area of Science:
- Pharmacology
- Clinical Pharmacy
- Pediatric Neurology
Background:
- Phenobarbital (PB) is an antiepileptic drug used in children.
- Accurate therapeutic drug monitoring is crucial for optimizing PB treatment efficacy and safety.
- Saliva sampling offers a non-invasive alternative to serum collection for drug level assessment.
Purpose of the Study:
- To evaluate the correlation between salivary phenobarbital (PB) concentrations and serum PB levels (total and free) in epileptic children.
- To assess the relationship between salivary pH and salivary PB concentrations.
- To determine the clinical utility of salivary PB monitoring in epilepsy management.
Main Methods:
- Twenty epileptic children receiving phenobarbital therapy were enrolled.
- Phenobarbital concentrations in saliva (Sa) and serum (total serum concentration - TS, free serum concentration - FS) were measured.
- Salivary pH was also recorded.
- Statistical analysis, including correlation coefficients (r), was used to assess relationships between variables.
Main Results:
- A strong positive correlation was observed between salivary PB and total serum PB (Sa/TS ratio = 43.0 +/- 5.2%, r = 0.98).
- Salivary PB concentrations were also highly correlated with free serum PB concentrations (r = 0.99).
- No significant relationship was found between salivary pH and the Sa/TS ratio for PB.
Conclusions:
- Salivary phenobarbital concentration is a reliable indicator of both total and free serum phenobarbital levels in children.
- Saliva monitoring of phenobarbital is a viable and potentially more convenient method for therapeutic drug monitoring in pediatric epilepsy.
- Further studies may explore the impact of salivary pH on other drug monitoring scenarios.
Abstract:
Twenty epileptic children taking phenobarbital (PB) were evaluated for the concentration of PB in their saliva (Sa), total serum concentration (TS), free serum concentration (FS), and also the pH of the saliva samples. The Sa/TS ratio was 43.0 +/- 5.2% (mean +/- SD), and showed a close relationship between the two (r = 0.98). The free serum concentrations for PB were also observed to be closely correlated to the saliva concentration (r = 0.99), as well as to the total serum concentration, with the FS/TS ratio being 45.0 +/- 5.6%. However, no obvious relationship between the salivary pH and the Sa/TS ratio for PB was observed. This suggested the usefulness of monitoring the PB saliva concentrations in clinical management of epilepsy.