Per Oral Endoscopic Myotomy (POEM) for Esophagogastric Junction Outflow Obstruction (EGOO)

Study Overview
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Brief Summary
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This research is being done to study an endoscopic procedure called POEM as a less invasive alternative to surgery in people with esophagogastric junction outlet obstruction (EGOO).

Detailed Description
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Patients with EGOO have difficulty swallowing and/or chest pain. Previously we were not able to distinguish this disease from achalasia. Achalasia is a disease which is characterized by a progressive difficulty with swallowing. It is caused by failure of relaxation of the lower esophageal sphincter (sphincter between esophagus and stomach) along with an essentially aperistaltic esophageal body. However, EGOO patients have abnormal lower esophageal sphincter relaxation with some preserved peristaltic activity. Because they have some peristalsis, these patients are not diagnosed with achalasia. Currently, a new diagnostic method, known as high-resolution manometry (HRM), can identify EGOO patients. EGOO patients usually do not respond well to medical treatment and surgery is required in most cases to reduce the pressure of lower esophageal sphincter muscles. This procedure is called Heller myotomy. Recently, a new endoscopic method for reducing lower esophageal sphincter pressure has been developed. This method, per-oral endoscopic myotomy (POEM) is now being performed clinically throughout the world, including Johns Hopkins Hospital. The technique utilizes a flexible endoscope to tunnel beneath the esophageal surface layer and cutting muscle fibers of the lower esophagus and upper stomach. POEM is an alternative to invasive surgery with fewer complications. POEM is performed safely at Johns Hopkins Hospital for achalasia patients. Outcomes of POEM have been excellent with greater than 90% positively responding to endoscopic myotomy. Patients with EGOO are being diagnosed more often due to increased use of HRM. They respond poorly to endoscopic therapies but well to surgical myotomy. POEM is the endoscopic equivalent to surgical intervention and represents a less invasive approach to treating these patients.

Official Title
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Per Oral Endoscopic Myotomy (POEM) for Esophagogastric Junction Outflow Obstruction (EGOO)

Conditions
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Esophagogastric Junction Outflow Obstruction

Intervention / Treatment
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* Procedure: POEM


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Consecutive adult patients (18-70 years of age) with symptomatic dysphagia (dysphagia score ≥2) EGOO that is diagnosed by high resolution manometry. Ability to give informed consent. Exclusion Criteria: Unable to give informed consent Pregnant or breastfeeding women (all female patients if child-bearing age will undergo urine pregnancy testing prior to endoscopy) Acute gastrointestinal bleeding Coagulopathy defined by prothrombin time < 50% of control; partial thromboplastin time (PTT) > 50 sec, or international normalized ratio (INR) > 1.5), on chronic anticoagulation, or platelet count <75,000 Inability to tolerate sedated upper endoscopy due to cardio-pulmonary instability or other contraindication to endoscopy Prior esophageal or gastric surgeries Cirrhosis with portal hypertension, varices, and/or ascites Active Esophagitis Hiatal hernia larger than 2cm Barrett's esophagus Eosinophilic esophagitis Esophageal stricture Esophageal malignancy Large esophageal diverticulum Mechanical obstruction to esophageal outflow or infiltrative esophageal or gastric disorders. Prior esophageal Botox injection

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: EGOO<br>Patients presenting with symptomatic gastroesophageal junction outflow obstruction (EGOO)who will be treated with Per oral endoscopic myotomy (POEM) | Procedure: POEM<br>* Patients will receive Per oral endoscopic myotomy (POEM) for symptomatic gastroesophageal junction outflow obstruction (EGOO)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in dysphagia severity | Dysphagia will be measured by Dysphagia score and Eckhardt score at 2 and 6 months after the procedure (The Eckhardt score takes into consideration symptoms of dysphagia, chest pain, regurgitation and chest pain) | 2 and 6 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Resolution in Esophago-gastric junction (EGJ) outflow obstruction by HRM performed 2 months after the procedure |  | 2 months | 
| Change in participants' quality of life | Improvement in patient's quality of life as reflected by Short Form-36 questionnaire at 2 and 6 months after the procedure | 2 and 6 months | 
| Complication rate | Complications include any of the following (full thickness perforations, unplanned mucosectomies, immediate and delayed bleeding). | 2 years | 
| Length of hospital stay |  | 2 years | 
| Procedural times |  | 2 years | 
| Post procedural Gastroesophageal reflux disease (GERD) | Frequency of post-procedural GERD as documented by either 24 hr ph/Impedence testing, 48 hr Bravo (performed at 2 months), or esophagogastroduodenoscopy (EGD) with evidence of esophagitis | 2 months | 
| Time to resume normal diet |  | 2 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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esophagogastric junction outflow obstruction, EGOO, Per oral endoscopic myotomy, POEM, Gastroesophageal reflux disease, GERD