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Updated: Aug 15, 2026

Simultaneous Laryngopharyngeal and Conventional Esophageal pH Monitoring
Published on: December 14, 2020
Apnea is not prolonged by acid gastroesophageal reflux in preterm infants
Juliann M Di Fiore1, Marina Arko, Meghan Whitehouse
1Department of Pediatrics, University Hospitals of Cleveland, Case Western Reserve University, Cleveland, Ohio, USA. jmd3@po.cwru.edu
Insights
Gastroesophageal reflux (GER) does not appear to cause or prolong apnea in preterm infants. This study found no temporal link between GER and apnea, nor did it affect apnea duration or severity.
Area of Science:
- Neonatal physiology
- Pediatric gastroenterology
- Respiratory control
Background:
- Gastroesophageal reflux (GER) is common in preterm infants.
- The relationship between GER and apnea, a frequent concern in neonates, requires further clarification.
Purpose of the Study:
- To investigate the temporal association between GER and apnea in preterm infants.
- To determine if GER influences the duration or severity of apnea.
Main Methods:
- 119 preterm infants underwent 12-hour cardiorespiratory monitoring.
- Respiratory inductance plethysmography, heart rate, SaO2, and esophageal pH were recorded.
- GER and apnea events were scored and analyzed for temporal relationships and duration.
Main Results:
- Over 6000 GER episodes were recorded, with only 1% associated with significant apnea.
- No increase in apnea rate was observed before, during, or after GER.
- GER did not prolong apnea duration or worsen associated drops in SaO2 or heart rate.
Conclusions:
- No evidence supports a temporal relationship between acid reflux and apnea in preterm infants.
- GER does not appear to prolong apnea or negatively impact cardiorespiratory parameters during apnea.
Objective:
To examine the temporal relationship between apnea and gastroesophageal reflux (GER) and to assess the effect of GER on apnea duration.
Methods:
A total of 119 preterm infants underwent 12-hour cardiorespiratory monitoring studies using respiratory inductance plethysmography, heart rate, oxygen saturation (SaO2), and esophageal pH. The studies were scored for GER (pH <4 for > or =5 seconds) and apnea > or =15 seconds or > or =10 seconds that occurred within 30 seconds of GER. Apnea > or =10 seconds was used to assess whether GER would prolong apnea duration.
Results:
There were 6255 episodes of GER. Only 1% of GER episodes were associated with apnea > or =15 seconds, and there was no difference in apnea rate before, during, or after GER. There was also no difference in rate of apnea > or =10 seconds before versus during GER; however, there was a decrease in apnea rate immediately after GER. The presence of GER during apnea did not prolong apnea duration, and GER had no effect on the lowest SaO2 or heart rate during apnea.
Conclusion:
There is no evidence of a temporal relationship between acid-based GER and apnea in preterm infants. In addition, GER does not prolong apnea duration and does not exacerbate the resultant decrease in heart rate and SaO2.
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