Electrical Stimulation Therapy (EST) of the Lower Esophageal Sphincter (GERD)

Electrical Stimulation Therapy (EST) of the Lower Esophageal Sphincter: a Multicenter, Randomized, Double-blind, Sham-controlled Parallel-group Trial Evaluating Short Term Efficacy of EndoStim Device on GERD

The investigational device that will be used in this trial is the EndoStim® Lower Esophageal Sphincter (LES) Stimulation System.

The purpose of this trial is to evaluate the safety and the effectiveness of electrical stimulation therapy (EST) on the lower esophageal sphincter (LES) in the treatment of subjects with gastroesophageal reflux disease (GERD).

The study population will consist of subjects diagnosed with pathological GERD as defined by abnormal pH and who complain of heartburn, regurgitation or both for > 6 months, on a daily PPI use.

Study Design:

Multicenter, randomized, double-blind, sham-controlled study. All subjects undergo screening and baseline visits, followed by system implantation, and randomization after 2 weeks to either a treatment Group (stimulation) or Control Group (delayed stimulation).

Randomized subjects complete a 10-week, double-blind phase. At the 14-week visit, subjects are unblinded, control group subjects begin receiving stimulation, and all subjects are followed for an additional 9-month open-label treatment phase.

Subjects continue receiving stimulation for an extended follow-up phase involving annual visits through 5 years.

Study Visits:

Screening and baseline visits. Laparoscopic implantable pulse generator (IPG) and lead implant procedure. Post-implant follow-up office visits at 2 weeks/randomization, 6, 10, 14, 24 and 48 weeks, followed by annual visits through 5 years.

Sample Size and Scope:

Forty-six subjects will be implanted and followed to 12 months after stimulation treatment at 3 investigational sites.

Inclusion Criteria:

• Subject able and willing to provide written informed consent
• Subject able and willing to comply with required study procedures and follow-up schedule
• Typical symptoms of GERD (regurgitation and/or heartburn) for longer than 6 months, heartburn responding to PPI therapy. Subject may also complain of atypical symptoms of GERD that may persist on PPI
• Daily dose of PPI or other acid neutralization drugs because of PPI intolerance
• Baseline visit GERD-HRQL score ≥ 20 following 14 days off-PPI and at least 10 points higher than their on-PPI (or other acid-neutralization drugs) GERD-HRQL score recorded during the Screening Visit
• Excessive lower esophageal acid exposure during pH monitoring (defined as distal esophageal pH < 4 for > 5.0% of the monitoring time) performed after 14 days off PPIs
• Subject is a suitable surgical candidate able to undergo general anesthesia and laparoscopic surgery.

Exclusion Criteria:

• Previous EndoStim LES System implant and/or implant attempt
• Previous esophageal surgery, including Nissen fundoplication
• Previous endoscopic intervention for the treatment of GERD and/or Barrett's esophagus
• Hiatal hernia larger than 2 cm as determined by any diagnostic investigation (i.e., endoscopy, manometry or laparoscopic visualization)
• Gastroparesis
• Any non-GERD esophageal motility disorders
• Esophageal stricture or significant esophageal anatomic abnormalities
• Barrett's epithelium or any grade of dysplasia
• Documented history of esophagitis Grade C or D (LA Classification)
• History of suspected or confirmed esophageal or gastric cancer
• Esophageal or gastric varices
• Symptoms of dysphagia more than once per week within the last 3 months
• Suspected or known allergies to titanium, platinum, iridium, stainless steel, silicone, epoxy, or nylon
• Body mass index (BMI) > 35 kg/m2
• Any significant multisystem diseases
• Autoimmune or a connective tissue disorder (scleroderma, dermatomyositis, Calcinosis-Raynaud's-Esophagus Sclerodactyly Syndrome (CREST), Sjogren's Syndrome, Sharp's Syndrome, etc.) requiring therapy in the preceding 2 years
• Type 1 diabetes mellitus or uncontrolled Type 2 diabetes mellitus (T2DM) defined as HbA1c > 9.5 in the previous 6 months or at screening/baseline, or has T2DM for > 10 years
• Significant cardiac arrhythmia or ectopy or significant cardiovascular disease (i.e. unstable angina pectoris, hemodynamically significant valvular disease, severe congestive heart failure), or cardiac therapeutic intervention within the last 6 months.
• Significant cerebrovascular event within the last 6 months
• Existing implanted electrical stimulator (pacemaker, implantable cardioverter defibrillator, deep brain stimulator (DBS), bone growth or pelvic floor stimulators, drug pumps, etc.)
• Chronic anticoagulant therapy
• Female subject of child-bearing potential and is pregnant or nursing, or intends to become pregnant during the trial period, who is not using a reliable form of birth control
• Subject is currently enrolled in other potentially confounding research
• Active infection as determined by the investigator
• History of any malignancy in the last 2 years
• Life expectancy less than 3 years
• Diagnosed major psychiatric disorder (bipolar, schizophrenia, etc.)