Effectiveness of Physiologic Testing in PPI Non-Responders

Completed · Early Phase 1

Conditions studied: Gastro Esophageal Reflux

In brief

The prevalence of GERD is estimated to be as high as 20% in the US, and up to 50% remain symptomatic on proton pump inhibitor (PPI) therapy. The clinical approach to understand the mechanism of nonresponse is not standardized, and patients will often undergo various tests: 1) pH-impedance, 2) wireless pH monitoring over 96 hours, 3) high-resolution impedance manometry (HRIM), and 4) mucosal impedance (MI). Controversy exists regarding the best technique, optimal study protocol and treatment approach for the PPI non-responder (PPINR) group, resulting in inappropriate resource utilization and a failure to provide effective personalized care. The first aim is to identify the relevant physiologic parameters of diagnostic tools in their ability to predict PPI requirement. In Aim Two, these results will be applied to guide the formal development of a clinical algorithm for the management of PPINRs with personalized clinical pathways based on mechanism of treatment failure. We will first perform a prospective comparison trial of 240 PPINR subjects at 2 sites over 4 years. Subjects will complete symptom questionnaires and undergo diagnostic testing (pH-impedance on PPI therapy, HRIM, 96-hr wireless pH monitoring off PPI therapy and MI). Those who have a positive pH study and/or resume PPI therapy will receive escalation of therapy with dexlansoprazole. We will compare the ability of 96-hr wireless pH monitoring vs pH impedance to predict PPI requirement and response to dexlansoprazole, respectively. We will explore whether MI is equivalent to 96-hr wireless pH monitoring in predicting PPI requirement. Lastly, we will determine whether HRIM metrics can be utilized to determine reflux burden, mechanism and response to treatment. Next, the investigators will develop quality measures for reflux testing in order to develop a simplified management strategy for the PPINR group. The RAND/UCLA Appropriateness Methodology will be utilized with an expert working group to develop formal validated quality measures for reflux testing.

Key facts

Study ID: NCT03202537
Run by: Northwestern University
People needed: 240
Starts: 2017-07-01
Expected to finish: 2022-07-31
Last updated by the study team: 2023-01-12

Who can join

Age: 18 and older, up to 80. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Male or female subjects aged 18-80 years old (females of childbearing potential should be on highly effective contraceptive methods)
Mentally capable to provide informed consent in English
Present to the Northwestern Medical Group GI practice or the Washington University Division of Gastroenterology with symptoms of GERD (heartburn, regurgitation, and non-cardiac chest pain)
Have failed an appropriate compliant trial of PPI therapy with a GERD-Q score ≥8.
Able to undergo endoscopy, ambulatory reflux monitoring, manometry, PPI therapy cessation and trial of dexlansoprazole therapy. Subjects with Los Angeles Classification Grade A (mild) or B esophagitis and symptomatic, non-erosive disease will be enrolled.

You may not qualify if…

Participation in a concurrent clinical trial or completed another trial within past 8 weeks.
Active severe erosive esophagitis (Los Angeles Grade C or D), long-segment Barrett's esophagus (Zap score of 4)
Eosinophilic esophagitis
Prior gastrointestinal surgery of the esophagus and/or stomach
Current treatment with dexlansoprazole
Current signs or symptoms of heart disease. All patients with non-cardiac chest pain are required to have a cardiologist evaluation as standard of care work up in the evaluation of non-cardiac chest pain.
Subjects with clinically abnormal results of the screening ECG and/or chemistry panel (particularly prolonged QTc interval or hypomagnesaemia) excluded from the dexlansoprazole trial. Subjects with sensitivities or allergies to the metals contained in the Bravo capsule including chromium, nickel, copper, cobalt, and iron.
Unstable medical illness with ongoing diagnostic work-up and treatment. Patients with well-controlled hypertension, diabetes and a remote history of ischemic heart disease that is deemed stable, as judged by the investigator can be included.
History of drug addiction, drug abuse or alcoholism.
Current neurologic or cognitive impairment, which would preclude ability to obtain informed consent.
Pregnant patients.
Patients with Cirrhosis (Childs Classification A-C).Special vulnerable populations including children, prisoners, institutionalized individuals.
Bleeding disorder or requirement of NSAID/aspirin during monitoring period.
Drugs that affect gastrointestinal symptoms (H2 blockers, antacids, metoclopramide, domperidone, erythromycin, anticholinergics [bentyl, levsin, belladonna etc.]). Antidepressants can be continued at stable dose.
Drugs listed on the Dexilant label including antiretrovirals (Rilpivirine-containing products, Atazanavir, Nelfinavir, Saquinavir, etc), Warfarin, Methotrexate, Drugs Dependent on Gastric pH for Absorption (e.g., iron salts, erlotinib, dasatinib, nilotinib, mycophenolate mofetil, ketoconazole/itraconazole), Tacrolimus, CYP2C19 or CYP3A4 Inducers or inhibitors.
Patients found to have achalasia, a spastic disorder, hypercontractile disorder or functional obstruction at the esophagogastric junction will be excluded. Subjects with a history of structuring or narrowing upon endoscopy (Subjects with no such history will be enrolled; however, if such features are noted upon endoscopy during the study, these subjects will not undergo MI testing).

Where it is running

Northwestern Memorial Health Care — Chicago, Illinois, United States

Full record on ClinicalTrials.gov

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