Radiofrequency Ablation vs Sham Procedure for Symptomatic Cervical Inlet Patch

Guy's and St Thomas' NHS Foundation Trust

Status: Unknown

Conditions: Barrett Esophagus

Treatments: Procedure: Radiofrequency ablation (RFA)

Study type: Interventional

Funder types: Other

Identifiers

NCT03471052

216038

Details and patient eligibility

About

Inlet patch is a congenital condition of the upper oesophagus, consisting of stomach lining that is in the wrong place. It affects 5% of the population. Symptoms are a feeling of a ball in the back of the throat (called chronic globus sensation), cough and sore throat - these account for 4% of general practitioner (GP) referral to Ear Nose & Throat departments.

There is no recognised treatment. Drugs that reduce acid may help but do not block mucus production. Argon Plasma coagulation has been shown to be successful but limited to a few expert centres. The investigators have previously shown a device that uses radiofrequency energy to remove the patch to be highly effective in a ten patient pilot study, with 80% response rate that was durable over 1 year.

The purpose of this trial is to demonstrate the previous study was not due to placebo effect alone, with a sham controlled arm. Patients would then crossover to treatment at 6 months after sham. All males and non-pregnant females over 18 years old with previously diagnosed inlet patch causing symptoms of globus, with > 50% severity on a visual analogue score, are eligible.

Full description

Inlet patch is a congenital anomaly of the upper oesophagus, consisting of stomach lining that is in an aberrant position. Prevalence is up to 10% on endoscopy studies and 5% on post mortem studies. There is thought to be a link with another condition of the lower oesophagus called Barrett's oesophagus, although there is limited evidence. Unlike Barrett's oesophagus, progression to cancer from an inlet patch is exceptionally rare.

The inlet patch can produce acid and mucus, and is associated with symptoms including sore throat, cough and hoarseness. One particular symptom, called globus pharyngeus (the feeling of a ball in the back of the throat) is often associated with an inlet patch.

There is no recognised treatment for symptomatic inlet patch. Anti-acid medications works for some but not all, which may in part be explained by the lack of acid producing cells in some inlet patches. Ablation of the inlet patch has been successful in small series using Argon Plasma Coagulation. This device is, however, associated with inter user variability and unpredictable depth of ablation. Radiofrequency ablation (RFA) using the BarrxTM System is a National Institute for Health and Clinical Excellence (NICE) and FDA approved device for treatment of abnormal oesophageal lining, which has shown to be successful in reversing Barrett's oesophagus to normal squamous lining. These devices are advantageous as the depth of ablation is controlled. The investigators have previously demonstrated, in a pilot study, that these devices are safe and effective for reversal of inlet patch to normal mucosa, with improvement in symptoms.

This study will use the BarrxTM system to treat patients with symptomatic inlet patch that is refractory to standard anti-acid medication, in a blinded sham controlled trial.

Enrollment: 50 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Patients with symptoms secondary to Inlet patch and globus score > 50 on Visual Analogue Scale (VAS)
2. Histological confirmation of presence of Inlet patch
3. Symptoms not responsive or partially responsive to (proton pump inhibitor) PPI therapy for > = 6 weeks
4. Males and non-pregnant females over the age of 18 years. Female patients who are pre-menopausal must practice a medically acceptable form of contraception.
5. Patients must sign an informed consent form.

Exclusion criteria

1. Patients in whom endoscopy is contraindicated.
2. No globus symptoms
3. Patients previously or currently treated for oesophageal dysplasia or cancer
4. Patients with eosinophilic oesophagitis
5. Patients with oesophageal varices
6. Previous radiotherapy
7. Patients who have undergone Hellers myotomy
8. Pregnant females.
9. People under the age of 18 years.
10. Evidence of major motility disorder on High resolution Manometry
11. Patients with pre-existing ENT disorders causing globus.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Double Blind

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50 participants in 2 patient groups

Radiofrequency ablation (RFA)

Experimental group

Description:

Radiofrequency ablation (RFA)

Treatment:

Procedure: Radiofrequency ablation (RFA)

Sham procedure

No Intervention group

Description:

Endoscopy will be performed under conscious sedation and all BarrX RFA equipment will be set up in room. A sound recording of the BarrxTM RFA device will be played (a distinct bell sound that is emitted from the generator) during the procedure.