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Reflux and pH: 'alkaline' components are not neutralized by gastric pH variations
P Bechi1, F Cianchi, R Mazzanti
1Clinica Clirurgica Generale, Università di Firenze, Florence, Italy.
Summary
Alkaline reflux components like bile acids and lysolecithin are present in gastric aspirates even at low pH. Their concentrations decrease with lower pH, but further research is needed to determine damage thresholds in vivo.
Area of Science:
- Gastroenterology
- Biochemistry
Background:
- The in vivo mucosal damage potential of alkaline reflux components remains debated.
- Precipitation of bile acids and lysolecithin at low pH questions their in vivo damage capacity.
Purpose of the Study:
- To determine the composition of gastric aspirates at varying initial pH levels.
- To assess the solubility of alkaline components under artificially induced pH changes.
Main Methods:
- Gastric aspirate samples collected via nasogastric tubes post-surgery.
- Quantification of bile acids and lysolecithin using dedicated assays.
- Analysis repeated after artificial pH adjustments (2, 3.5, 5.5, 7).
Main Results:
- Bile acid and lysolecithin concentrations significantly increased with higher initial gastric pH (p < 0.001).
- Both components were present even at pH < 2.
- Artificial pH variations showed no significant impact on measured concentrations.
Conclusions:
- Bile acids and lysolecithin naturally occur in the stomach, even at low pH.
- Concentrations of these components decrease as gastric pH lowers.
- Further studies are required to establish the in vivo mucosal damage thresholds for these substances.