Clinical trial NCT01755221: Positive Predictive Value of the Dx-pH Probe for Predicting PPI Response in LPR
Official title: A Prospective Evaluation of the Utility, Optimal Cutoff and Positive Predictive Value of a Pharyngeal Potential of Hydrogen (pH) Probe for Predicting Proton Pump Inhibitor Response in Treatment Naive Laryngopharyngeal Reflux
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Laryngopharyngeal Reflux (LPR)
Extraesophageal Reflux
Reflux Laryngitis
Posterior Laryngitis
Keywords: Laryngopharyngeal reflux (LPR)
Extraesophageal reflux
Reflux laryngitis
Posterior laryngitis
Proton pump inhibitor (PPI) medication
Restech pH probe
Lead sponsor: Northwestern University
Sponsor class: OTHER
Collaborators: name: Respiratory Technology Corporation
First posted: 2012-12-24
Enrollment: 42
Sex: ALL
Minimum age (years): 18
Maximum age (years): 89
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: People receiving care at Northwestern Medicine for laryngeal symptoms

Brief summary: The purpose of this research study is to better understand whether information obtained from a pH probe can help physicians predict whether a patient will respond to the medication that is prescribed for laryngopharyngeal reflux (LPR). The current treatment given to individuals who are diagnosed with LPR is a course of proton pump inhibitor (PPI) medication. Subjects who agree to participate in this study will have a small flexible tube (about the width of a piece of cooked spaghetti) placed in their throat. This tube measures the pH in the throat over a period of 24 hours and helps physicians study the relationship between pH level, LPR symptoms, and the effectiveness of PPI therapy. This study may help physicians find out if certain symptoms or characteristics can help them predict if the PPI medication will be effective for each patient. After probe removal, subjects will receive compensation. They will return to the clinic at their regularly scheduled follow-up visit with the physician, 8 to 12 weeks after starting the PPI medication. At that time, subjects can choose to participate in an optional probe placement.

Detailed description: The purpose of this research study is to better understand whether information obtained from a pH probe can help physicians predict whether a patient will respond to the medication that is prescribed for laryngopharyngeal reflux (LPR). The current treatment given to individuals who are diagnosed with LPR is a course of proton pump inhibitor (PPI) medication. This medication reduces the amount of gastric acid that is produced and generally leads to symptom relief. In order to study whether the pH probe can help physicians predict if the patient will respond to PPI therapy, the physicians will measure the pH level of patients' throats before they start PPI medication. Subjects who agree to participate in this study will have a small flexible tube (about the width of a piece of uncooked spaghetti) placed in their throat. The physician will place the tube through the nose until the tip is in the back of the throat, high enough so that the patient will not feel it when they talk, eat, drink, or swallow. This tube measures the pH in the throat over a period of 24 hours and helps physicians study the relationship between pH level, LPR symptoms, and the effectiveness of PPI therapy. This study may help physicians find out if certain symptoms or characteristics can help them predict if the PPI medication will be effective for each patient. After probe removal, subjects will receive compensation. They will return to the clinic at their regularly scheduled follow-up visit with the physician, 8 to 12 weeks after starting the PPI medication. At that time, subjects can choose to participate in an optional probe placement.

Eligibility criteria: Inclusion Criteria:

* Patients presenting for evaluation for symptoms classically associated with LPR with a Reflux Symptom Index (RSI) of greater than or equal to 13. The most common symptoms associated with LPR include hoarseness, throat clearing, globus sensation, nocturnal laryngospasm, postnasal drip, chronic cough, and dysphagia.
* Symptom duration of greater than 1 month
* Ages 18-89

Exclusion Criteria:

* Pre-existing PPI therapy for any indication within two weeks of Dx-pH probe placement visit
* Presence of findings of alternative diagnosis explaining symptoms e.g.: laryngeal mass, objective post nasal drainage
* Contraindication to PPI therapy (i.e.: atrophic gastritis, liver problems, severe bloody diarrhea from antibiotics, osteoporosis, broken bone) or unwillingness to initiate PPI therapy
* Pregnancy: There is no contraindication for the Restech pH probe and pregnancy; however, PPI use in pregnant women is contraindicated and thus pregnant women would be ineligible to participate in this study because they would be unable to complete a course of omeprazole.
* Unwillingness or inability to undergo 24 hour pharyngeal pH probe monitoring (for example, oxygen wearing requirement that prevents probe placement or anatomical preclusions like septal perforation).
* Bleeding disorder and/or unable to stop use of anticoagulants such as aspirin, Coumadin (warfarin), and/or Plavix (clopidogrel)

Primary outcomes:
measure: RSI Score
timeFrame: 8-12 weeks after initial clinic visit
measure: Global improvement in self-reported symptoms
timeFrame: 8-12 weeks after initial clinic visit
Secondary outcomes:
measure: Differences in pH between PPI responders and non-responders
timeFrame: 8-12 weeks after initial clinic visit
measure: Effects of PPI therapy on reflux events
timeFrame: 8-12 weeks after initial clinic visit
Other outcomes:
Locations:
city: Chicago
country: United States
facility: Northwestern Medical Faculty Foundation (NMFF) Sinus and Allergy Center
state: Illinois
Study officials:
affiliation: Northwestern University
name: Bruce Tan, MD
role: PRINCIPAL_INVESTIGATOR
References:
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citation: Ayazi S, Lipham JC, Hagen JA, Tang AL, Zehetner J, Leers JM, Oezcelik A, Abate E, Banki F, DeMeester SR, DeMeester TR. A new technique for measurement of pharyngeal pH: normal values and discriminating pH threshold. J Gastrointest Surg. 2009 Aug;13(8):1422-9. doi: 10.1007/s11605-009-0915-6. Epub 2009 May 7.
citation: Becker V, Graf S, Schlag C, Schuster T, Feussner H, Schmid RM, Bajbouj M. First agreement analysis and day-to-day comparison of pharyngeal pH monitoring with pH/impedance monitoring in patients with suspected laryngopharyngeal reflux. J Gastrointest Surg. 2012 Jun;16(6):1096-101. doi: 10.1007/s11605-012-1866-x. Epub 2012 Mar 27.
citation: Yadlapati R, Pandolfino JE, Lidder AK, Shabeeb N, Jaiyeola DM, Adkins C, Agrawal N, Cooper A, Price CP, Ciolino JD, Gawron AJ, Smith SS, Bove M, Tan BK. Oropharyngeal pH Testing Does Not Predict Response to Proton Pump Inhibitor Therapy in Patients with Laryngeal Symptoms. Am J Gastroenterol. 2016 Nov;111(11):1517-1524. doi: 10.1038/ajg.2016.145. Epub 2016 Apr 19.
citation: Yadlapati R, Adkins C, Jaiyeola DM, Lidder AK, Gawron AJ, Tan BK, Shabeeb N, Price CP, Agrawal N, Ellenbogen M, Smith SS, Bove M, Pandolfino JE. Abilities of Oropharyngeal pH Tests and Salivary Pepsin Analysis to Discriminate Between Asymptomatic Volunteers and Subjects With Symptoms of Laryngeal Irritation. Clin Gastroenterol Hepatol. 2016 Apr;14(4):535-542.e2. doi: 10.1016/j.cgh.2015.11.017. Epub 2015 Dec 9.