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Rectal pH in children
J P Jantzen1, I Tzanova, P K Witton
1Department of Anaesthesiology, Johannes Gutenberg, University Medical School, Mainz, F.R.G.
Insights
This study established normal rectal pH values in children, finding a mean of 9.6. This alkalinity may explain variable drug absorption when administered rectally in pediatric patients.
Area of Science:
- Pediatric Gastroenterology
- Clinical Pharmacology
Background:
- Establishing normal physiological parameters is crucial for accurate medical interpretation.
- Rectal drug administration is common in pediatric populations, but its efficacy can be unpredictable.
Purpose of the Study:
- To determine the normal range of rectal pH in pediatric patients.
- To investigate potential factors influencing rectal pH in children.
- To assess the implications of rectal pH on rectal drug bioavailability.
Main Methods:
- Recruited 100 pediatric patients (25 infants, 75 children).
- Measured rectal pH using a monocrystalline antimony electrode.
- Analyzed pH data in relation to sex, age, and nutritional status.
Main Results:
- The mean rectal pH was 9.6 ± 0.9 (range 7.2–12.1).
- Rectal pH was not significantly influenced by sex, age, or nutrition.
- Observed rectal pH values were considerably higher than those reported for adults.
Conclusions:
- The wide range of rectal pH in children may contribute to variable drug bioavailability via the rectal route.
- The alkaline nature of the pediatric rectal environment should be considered in the formulation of pediatric rectal medications.
Abstract:
In an attempt to establish normal values for rectal pH in children, we have measured pH in 100 paediatric patients. Measurement of rectal pH was performed in 25 infants and 75 children (27 girls and 73 boys) using a monocrystalline antimony electrode. Rectal pH was 9.6 +/- 0.9 (mean +/- SD, range 7.2 to 12.1) and was independent of sex, age and nutrition. This wide range of rectal pH values offers a possible explanation for the widely scattered bioavailability of drugs administered by the rectal route. Mean rectal pH was considerably higher than that reported for adults; this unexpected alkalinity should be taken into account, when drug formulations are considered for rectal administration in children.