The pH of Feeding Tube Aspirates From Critically Ill Infants

Area of Science:

• Pediatric critical care medicine
• Gastroenterology
• Neonatal physiology

Background:

• The effect of gastric acid inhibitors and enteral feedings on gastric pH in infants remains poorly understood.
• Accurate assessment of gastric pH is crucial for clinical decision-making in critically ill infants.

Purpose of the Study:

• To compare gastric aspirate pH values in critically ill infants based on the administration of gastric acid inhibitors and/or feedings.
• To evaluate the utility of pH 5.5 as a cutoff for confirming gastric placement.

Main Methods:

• Colorimetric pH testing was performed on gastric aspirates from 54 critically ill infants.
• Infants were categorized based on the use of acid inhibitors and feedings: no inhibitors/feedings, inhibitors only, feedings only, or both.
• Aspirates from non-gastric sites were excluded from primary analysis.

Main Results:

• A pH of 5.5 or less was observed in 97% of aspirates from infants without recent feedings or acid inhibitors.
• 77% of aspirates from infants receiving acid inhibitors and 67% from those receiving feedings had a pH of 5.5 or less.
• A pH cutoff of 5.5 or less did not reliably differentiate gastric from esophageal or duodenal placement.

Conclusions:

• Gastric aspirate pH in critically ill infants is frequently 5.5 or less, irrespective of acid inhibitor or feeding status.
• A pH cutoff of 5.5 or less may be useful in ruling out respiratory (tracheal) placement, as tracheal pH is typically higher.
• Further research is needed to establish definitive pH thresholds for accurate tube placement verification.