Evaluation of gastroesophageal reflux events in children using multichannel intraluminal electrical impedance

Area of Science:

• Pediatric Gastroenterology
• Gastrointestinal Motility Disorders

Background:

• Most gastroesophageal reflux (GER) episodes in infants and children are nonacidic (pH >4).
• Extraesophageal symptoms like apnea and aspiration can result from both acidic (pH <4) and nonacidic reflux.
• Standard pH monitoring has limitations in pediatric GER diagnosis as it often misses nonacidic reflux events.

Purpose of the Study:

• To evaluate the utility of pH-independent multiple intraluminal electrical impedance technique (IMP) in diagnosing GER in infants and children.
• To compare the diagnostic capabilities of combined impedance and pH monitoring versus pH monitoring alone.

Main Methods:

• Utilized the pH-independent multiple intraluminal electrical impedance technique (IMP) to detect all esophageal bolus movements.
• Analyzed IMP data for bolus composition, reflux height, duration, and clearance.
• Combined IMP with pH monitoring on a single catheter for comprehensive GER assessment.

Main Results:

• IMP detects all bolus movements, including nonacidic reflux, which are undetectable by pH monitoring alone.
• Combined IMP and pH monitoring provides detailed analysis of reflux characteristics.
• This combined approach proved valuable for diagnosing GER and associated symptoms in the pediatric population.

Conclusions:

• Standard pH monitoring is insufficient for diagnosing the majority of GER episodes in infants and children.
• The multiple intraluminal electrical impedance technique (IMP), especially when combined with pH monitoring, offers a more comprehensive diagnostic tool for pediatric GER.
• Combined impedance-pH monitoring enhances the detection and characterization of GER, leading to better diagnosis of associated extraesophageal symptoms.