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Updated: Jun 9, 2026

Simultaneous Laryngopharyngeal and Conventional Esophageal pH Monitoring
Published on: December 14, 2020
Esophageal impedance in children: symptom-based results
Silvia Salvatore1, Serena Arrigo, Carlo Luini
1Clinica Pediatrica, Università dell'Insubria, Varese, Italy.
Insights
Multiple intraluminal esophageal impedance with pH-monitoring improves reflux symptom correlation. Young infants show stronger symptom association with weakly acid reflux than with acid reflux.
Area of Science:
- Gastroenterology
- Pediatric Medicine
- Diagnostic Technology
Background:
- Accurate correlation of gastrointestinal symptoms with reflux events is crucial for diagnosis and management in infants and children.
- Traditional pH monitoring alone has limitations in detecting all types of reflux and their association with symptoms.
- Multiple intraluminal esophageal impedance with pH-monitoring (MII-pH) offers a more comprehensive approach to assess esophageal challenges.
Purpose of the Study:
- To evaluate the correlation between symptoms and reflux events using MII-pH monitoring.
- To compare the diagnostic yield of MII-pH monitoring versus pH monitoring alone for reflux-symptom association.
- To investigate age-specific differences in reflux-symptom associations, particularly in infants.
Main Methods:
- Prospective analysis of MII-pH tracings and concurrent symptom reporting in pediatric patients.
- Defined reflux-symptom association based on a 2-minute temporal window.
- Analyzed data stratified by age groups (1-6 months, 6-12 months, >12 months) and symptom types (crying, pain, cough, vomiting).
Main Results:
- MII-pH monitoring identified 52% of symptoms as reflux-associated, including acid reflux (AR) and weakly acid reflux (wAR).
- Vomiting showed the strongest association with reflux; cough association was higher in infants.
- Symptom association probability (SAP) was significantly higher with MII-pH compared to pH monitoring alone, especially for weakly AR in young infants.
Conclusions:
- MII-pH monitoring significantly enhances the detection of reflux-symptom associations compared to pH monitoring alone.
- In young infants, symptoms are more frequently linked to weakly acid reflux than to purely acid reflux.
- The findings support the utility of MII-pH in diagnosing reflux-related symptoms in pediatric populations, with specific considerations for age and reflux type.
Objective:
To correlate multiple intraluminal esophageal impedance recording with pH-monitoring with symptoms.
Study Design:
Symptoms occurring within a 2-minute window of a reflux were considered to be associated with reflux. Analyses were performed in 1- to 6-, 6- to 12-, and >12-months-old patients for crying, pain, cough, and vomiting.
Results:
A total of 70 of 225 tracings were discarded. Of 2172 symptoms, 1136 (52%) were reflux-associated (45% acid reflux [AR], 51% weakly AR, 3% alkaline reflux). The strongest reflux-symptom association was found for vomiting. Cough-reflux association was higher in infants than in older children. In older patients, symptom-reflux association was more with AR. Symptoms were associated with proximal reflux in 70% of patients. The symptom index and symptom association probability (SAP) were positive (>50% for symptom index and >95% for SAP) for all refluxes in 83% and 46% of patients and for AR in 49% and 47% of patients, respectively. In 1- to 6-month-old infants, symptom index and SAP were higher for weakly AR than for AR. For crying, SAP was independent of AR or weakly AR. For cough, SAP was positive in one-third of patients, predominantly with AR in 6- to 12-month-old infants and with weakly AR in the other infants.
Conclusion:
Multiple intraluminal esophageal impedance recording with pH-monitoring doubles the probability of documenting an association between symptoms and reflux compared with pH monitoring. In young infants, symptoms are more frequently associated with weakly AR than with AR.
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