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Supplemental oxygen and gastric pH in unfed preterm infants
L J Whetstine1, T C Hulsey, D J Annibale
1Department of Pediatrics, Medical University of South Carolina, Charleston, USA.
Insights
Oxygen supplementation in premature infants is linked to reduced gastric acidity, even after accounting for gestational age. This finding is crucial for understanding infant gastrointestinal health and potential complications.
Area of Science:
- Neonatal Physiology
- Gastroenterology
- Pediatric Medicine
Background:
- Hypoxia is known to decrease gastric acidity in pediatric populations.
- In neonates, gestational age inversely correlates with gastric acidity, potentially confounding hypoxia-acidity relationships.
- Understanding the impact of oxygen therapy on gastric pH in premature infants is critical.
Purpose of the Study:
- To investigate the relationship between oxygen supplementation and gastric acidity in premature neonates.
- To determine if oxygen therapy independently affects gastric pH in this vulnerable population.
Main Methods:
- Compared 24-hour continuous gastric pH measurements in premature infants (<36 weeks gestational age).
- Utilized an indwelling flexible gastric pH probe for continuous monitoring.
- Assessed infants who required oxygen supplementation versus those who did not, ensuring they were unfed.
Main Results:
- Infants requiring oxygen had a lower gestational age (30.5 +/- 3.0 weeks) than those not requiring oxygen (32.9 +/- 1.5 weeks).
- Mean gastric pH was significantly higher in infants requiring oxygen (4.4 +/- 1.7) compared to those not needing oxygen (2.7 +/- 1.2).
- Even after controlling for gestational age and other factors, infants on oxygen showed significantly reduced gastric acidity.
Conclusions:
- Oxygen supplementation is independently associated with reduced gastric acidity in premature neonates.
- This finding has implications for managing gastrointestinal issues in preterm infants receiving respiratory support.
- Further research may explore the mechanisms and clinical consequences of altered gastric acidity due to oxygen therapy.
Abstract:
Hypoxia has been associated with decreased gastric acidity in infants and children. In neonates, an inverse relationship between gestational age and gastric acidity may confound this association. To assess the relationship between oxygen supplementation and gastric acidity in premature neonates, mean 24-hour continuous measurements of gastric pH, obtained by an indwelling flexible gastric pH probe, were compared in infants requiring and not requiring oxygen. Patients were < 36 weeks' gestational age and were unfed before and during the assessment period. The gestational age of infants who required oxygen was less than that of infants who did not (30.5 +/- 3.0 vs 32.9 +/- 1.5 weeks, respectively). Other comparison variables were not different. The mean pH for infants requiring oxygen (4.4 +/- 1.7) was significantly greater than that of those not needing oxygen (2.7 +/- 1.2). After controlling for population characteristics and gestational age, we found that infants requiring oxygen still had significantly reduced gastric acidity.