Related Experiment Videos
Gastroesophageal reflux in infants: evaluation of a new intraluminal impedance technique
Insights
The intraluminal multiple electrical impedance (IMP) technique detects all gastroesophageal reflux (GER) events in infants, surpassing pH metry
Area of Science:
- Pediatric Gastroenterology
- Medical Device Technology
- Diagnostic Techniques
Background:
- Gastroesophageal reflux (GER) is a common condition in infants, often presenting with symptoms like apnea and failure to thrive.
- Current diagnostic methods like pH metry primarily detect acid reflux, potentially missing non-acidic events.
- Accurate detection of all GER episodes is crucial for effective management of GER disease.
Purpose of the Study:
- To evaluate the efficacy of intraluminal multiple electrical impedance (IMP) combined with pH metry for detecting gastroesophageal reflux (GER) in infants.
- To compare the diagnostic capabilities of IMP with traditional pH metry in identifying GER episodes.
- To assess the utility of IMP in characterizing GER events, including volume flow and clearance.
Main Methods:
- Simultaneous application of pH metry and a novel intraluminal multiple electrical impedance (IMP) procedure using a combined catheter.
- Investigated 17 infants with clinical symptoms of GER disease over two feeding periods.
- Analyzed IMP patterns for retrograde esophageal volume flow indicative of GER and anterograde transport during clearance.
Main Results:
- IMP identified a unique retrograde esophageal volume flow pattern in 106 of 185 acid GER episodes detected by pH metry.
- IMP detected 490 additional GER episodes not identified by pH metry, with over 75% reaching the pharyngeal space.
- IMP detected GER events missed by pH metry, particularly during inter-feeding periods, and indicated faster volume clearance than acidity clearance.
Conclusions:
- The IMP technique offers a comprehensive approach to GER detection, identifying both acid and non-acid reflux events.
- IMP improves upon pH metry by detecting a larger volume of GER episodes, including those in infants with hypoacidity.
- IMP may enhance the evaluation of GER disease and improve diagnostic accuracy in challenging pediatric cases.
Abstract:
In this study, pH metry was simultaneously applied with a new technique, the intraluminal multiple electrical impedance (IMP) procedure, for measuring gastrointestinal motility for gastroesophageal reflux (GER) detection. Seventeen infants with clinical symptoms of GER disease such as recurrent apnea, aspiration pneumonia, wheezing, and failure to thrive were investigated during two feeding periods. A single catheter combining a pH electrode with seven electrodes for impedance measurements over a distance of 8.5 cm was used for the investigation. In all patients, 185 acid episodes were detected by pH metry. In 106 of these 185 acid episodes, a unique pattern in the IMP readings was noted, indicated by a retrograde esophageal volume flow. These episodes were regarded as acid GER episodes. Seventy-one of the 185 acid episodes occurred during the clearance process of a preceding acid GER characterized by typical IMP readings of an anterograde bolus transport. Eight of 185 acid episodes were missed in the IMP readings for technical reasons. The IMP pattern described as characteristic for a GER was observed in 490 other episodes not detected by pH metry. More than 75% of all GER detected by IMP reached the pharyngeal space; 73% of all GER occurred during feeding and the first 2 postprandial hours and 27% occurred during the remaining time until the next feeding. Even during the latter period, 34% of GER were detected by IMP only; they were missed by pH metry. Volume clearance indicated by IMP was always completed earlier than acidity clearance. The results show that IMP technique facilitates the detection of all GER, whereas pH metry is confined to the measurement of acid GER. Therefore, this technique might improve the evaluation of GER disease and detection of GER in conditions with gastric hypoacidity.