Role of Pain Modulation in GERD Patients Who Failed Standard Dose PPI

Failure of standard dose PPI to control GERD symptoms has been increasingly encountered in clinical practice (both primary care and sub-specialties) and has become one of the most challenging therapeutic dilemmas in GERD management. It has been estimated that up to 30% of the patients receiving PPI once daily will continue to report typical GERD symptoms [1]. Presently, increasing the PPI dose has been the standard of care in these patients [2]. However, success in relieving refractory GERD symptoms with such a therapeutic approach has been extremely limited, resulting in frustration of both the patient as well as the health care provided. Furthermore, patients who fail PPI will continue to seek medical attention and may undergo a variety of invasive or non-invasive tests, and thus consume already limited health care resources. Recent advancement in the understanding of the diverse composition of the different GERD groups as well as symptom generation has led to the recognition of alteration in pain perception as an important contributing factor for PPI failure in some and the presence of non-acid related stimuli in others [3].

This study will clarify for the first time the role of pain modulation in patients who failed standard dose of PPI. The clinical experience with doubling the PPI dose, which is the current standard of care, has been very limited and relatively disappointing. Additionally, this study may identify the group of PPI failure patients that may benefit from doubling the dose of PPI and the group that will benefit more from adding a pain modulator. This study is timely, has never been performed and addresses a prevalent emerging clinical dilemma in GI as well as primary care clinics.

Inclusion criteria

• Currently being treated with a PPI, but continue to experience GERD symptoms (such as heartburn) at least 2 times per week.

Exclusion criteria

• Known allergy or intolerance to TCA
• History of serious arrhythmia or use of anti-arrhythmics
• History of seizures
• Subjects with significant co-morbidity, e.g., cardiovascular, respiratory, urogenital, renal, gastrointestinal, hepatic, hematological, endocrine, neurologic or psychiatric
• With evidence or history of drug abuse within the past 6 months
• Erosive esophagitis, esophageal ulceration, peptic stricture, Barrett's esophagus or adenocarcinoma of the esophagus on endoscopy
• History of esophagogastric surgery
• Gastric or duodenal lesions (ulcer, tumor, etc.)
• Women who are pregnant or of childbearing age who are not on contraception
• Patients who are unwilling or unable to provide informed consent
• Insulin dependent diabetes