Comparison between Conventional and Simple Measuring Methods of Mean Nocturnal Baseline Impedance in Pediatric...

Area of Science:

• Gastroenterology
• Pediatric Medicine
• Diagnostic Technology

Background:

• Multichannel intraluminal impedance-pH (MII-pH) monitoring is a standard tool for diagnosing gastroesophageal reflux disease (GERD).
• Mean nocturnal baseline impedance (MNBI) is a key MII-pH parameter indicating esophageal mucosal integrity and GERD treatment effectiveness.
• Accurate MNBI measurement is crucial for diagnosing GERD in children.

Purpose of the Study:

• To assess the correlation between conventional MNBI measurements and a simplified MNBI calculation method.
• To evaluate the diagnostic utility of the simple MNBI method in pediatric GERD cases.
• To compare the performance of simple MNBI versus conventional MNBI in differentiating GERD phenotypes.

Main Methods:

• Prospective observational study involving 64 pediatric patients (1 month to 18 years) undergoing 24-hour MII-pH monitoring.
• Conventional MNBI measured during stable 10-minute nocturnal intervals.
• Simple MNBI calculated by averaging impedance throughout the entire nocturnal supine period.

Main Results:

• High correlations (r > 0.85 in infants, r > 0.9 in older children) observed between conventional and simple MNBI values across all impedance channels.
• Both conventional and simple MNBI in the distal channel (Z6) effectively differentiated non-erosive reflux disease (NERD) (AUCs ~0.86).
• Simple MNBI exhibited diagnostic performance comparable to conventional MNBI in terms of sensitivity and specificity.

Conclusions:

• The simple MNBI measurement method shows strong correlation and comparable diagnostic performance to conventional MNBI in pediatric GERD.
• Integrating simple MNBI into routine MII-pH monitoring can improve GERD diagnosis in children.
• This simplified approach may decrease the necessity for more invasive diagnostic procedures.