24-Hour Multichannel Intraluminal Impedance-pH in Proton Pump Inhibitor Nonresponders vs Responders in Patients With Laryngopharyngeal Reflux.
OBJECTIVE
This study aimed to evaluate the characteristics of reflux in proton pump inhibitor (PPI) nonresponders vs responders in patients with laryngopharyngeal reflux (LPR) by using 24-hour multichannel intraluminal impedance-pH (MII-pH) monitoring.


STUDY DESIGN
Prospective cohort study.


SETTING
A tertiary care otolaryngology clinic.


METHODS
Patients with typical LPR symptoms showing >1 proximal reflux episode were considered to have LPR and investigated prospectively. Patients were prescribed high-dose PPI twice daily and followed up for at least 2 months. Patients with LPR showing a ≥50% decrease in the follow-up reflux symptom index score during treatment periods as compared with pretreatment were defined as responders; others were defined as nonresponders. Various parameters in 24-hour MII-pH monitoring between nonresponders and responders with LPR were compared with Student's t test and receiver operating characteristic curve.


RESULTS
Eighty patients were diagnosed with LPR and categorized as nonresponders (n = 19) and responders (n = 61). Proximal all reflux time and proximal longest reflux time in various MII parameters were higher in responders than in nonresponders (P = .0040 and .0216, respectively). Proximal all reflux time >0.000517% was a better cutoff value to predict responders with LPR as compared with the proximal longest reflux time >0.61 minutes (sensitivity + specificity: 1.317 vs 1.291).


CONCLUSION
Proximal all reflux time in various 24-hour MII-pH monitoring parameters can be helpful to predict the response to PPI therapy in patients with LPR. These findings will help establish a personalized therapeutic scheme for patients with LPR.
['Kim|Su Il|SI|', 'Jeong|Su Jin|SJ|', 'Kwon|Oh Eun|OE|', 'Park|Jung Min|JM|', 'Lee|Young Chan|YC|', 'Eun|Young-Gyu|YG|', 'Ko|Seong-Gyu|SG|']
proton pump inhibitor nonresponder laryngopharyngeal reflux multichannel intraluminal impedance–pH (MII-pH)