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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.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|November 1, 1989
PubMed
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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.

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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.