# Gastroesophageal Reflux Disease and Antireflux Surgery

## Overview

Gastroesophageal reflux disease (GERD) affects approximately 20% of the Western population and is characterized by abnormal reflux of gastric contents that causes symptoms and/or mucosal injury. Most patients are managed medically with proton pump inhibitors (PPIs), but surgical intervention is indicated when medical therapy fails, is not tolerated, or when complications arise. Fundoplication remains the gold standard antireflux procedure and delivers durable long-term results.

## Pathophysiology

GERD is a multifactorial disease involving failure of the antireflux barrier at several levels. Lower esophageal sphincter (LES) dysfunction, including a hypotensive LES and transient LES relaxations (TLESRs), allows gastric contents to reflux into the esophagus. Hiatal hernia disrupts the anatomic antireflux mechanism by compromising the crural diaphragm, phrenoesophageal membrane, and angle of His. Esophageal body dysfunction leads to impaired acid clearance, while gastric factors such as delayed emptying and increased intra-abdominal pressure (particularly from obesity) further contribute.

Complications of chronic GERD include erosive esophagitis (classified by the LA system from Grade A through D), peptic stricture, Barrett esophagus (intestinal metaplasia), progression to esophageal adenocarcinoma through the Barrett dysplasia sequence, and extraesophageal manifestations such as chronic cough, laryngitis, asthma, and dental erosion.

## Preoperative Evaluation

### Symptom Assessment

Typical symptoms of heartburn and regurgitation are the most predictive of a good surgical outcome. Atypical symptoms including chest pain, cough, hoarseness, and asthma produce a less predictable surgical response. Any patient with dysphagia requires evaluation for stricture, motility disorder, or cancer.

### Diagnostic Studies

#### Upper Endoscopy (EGD)

EGD assesses mucosal injury, hiatal hernia size, and Barrett esophagus, and rules out malignancy. The Los Angeles classification grades erosive esophagitis from Grade A (mucosal breaks 5 mm or less) through Grade B (mucosal breaks greater than 5 mm but not confluent), Grade C (confluent erosions involving less than 75% of the circumference), and Grade D (erosions involving 75% or more of the circumference).

#### High-Resolution Manometry (HRM)

Manometry is mandatory before antireflux surgery. It excludes achalasia, absent peristalsis, and other major motility disorders, and assesses LES pressure and relaxation. The results guide the choice of fundoplication: patients with normal peristalsis receive a Nissen (360-degree) fundoplication, those with weak peristalsis (ineffective esophageal motility, or IEM) receive a partial fundoplication such as a Toupet (270-degree) or Dor, and patients with absent peristalsis face a relative contraindication to fundoplication with a partial wrap or alternative considered.

#### Ambulatory pH Monitoring

Ambulatory pH monitoring is the gold standard for quantifying acid exposure. The wireless pH capsule (BRAVO) provides 48-96 hour monitoring by attaching to the esophageal mucosa endoscopically. Catheter-based pH/impedance monitoring provides 24-hour data and measures both acid and non-acid reflux. A DeMeester score greater than 14.7 is considered abnormal. Diagnostic studies must be performed off PPI for 7 days, while on-PPI testing is useful for evaluating refractory symptoms to determine whether the medication is effectively controlling acid.

#### Barium Swallow

Barium swallow provides anatomic assessment of hiatal hernia, esophageal length, and motility. It identifies any paraesophageal component or shortened esophagus. The timed barium esophagram is particularly useful for achalasia follow-up.

<image>Preoperative workup algorithm for antireflux surgery showing the sequence of EGD, manometry, pH testing, and barium swallow with decision points</image>

## Indications for Antireflux Surgery

Antireflux surgery is indicated for failed medical management with persistent symptoms on optimal PPI therapy, patient preference to avoid lifelong PPI use, PPI intolerance or side effects with concern about long-term PPI risks, large-volume regurgitation (especially at night with aspiration risk), complications of GERD such as stricture or Barrett esophagus (though this indication is debated), extraesophageal manifestations clearly linked to documented reflux, young patients with a long anticipated duration of PPI therapy, and non-compliance with medical therapy.

## Nissen Fundoplication (360-Degree)

### Technique

The laparoscopic approach is standard using a 5-port technique. The key steps proceed as follows: the short gastric vessels are divided for complete fundic mobilization; the phrenoesophageal membrane and hiatal hernia sac are dissected; both vagal trunks are identified and preserved; the esophagus is mobilized adequately to achieve at least 3 cm of intra-abdominal esophageal length; the crura are closed posteriorly with interrupted non-absorbable sutures over a 52-56 Fr bougie; a "floppy" wrap measuring 2-2.5 cm is created using the gastric fundus (not the body); the wrap is secured with 2-3 non-absorbable sutures incorporating the esophageal muscularis; and the "shoe-shine" test is performed to ensure the wrap moves freely over the esophagus.

### Critical Technical Points

The wrap must be floppy -- loose enough that a finger can pass between the wrap and the esophagus. It should be short, measuring 2-2.5 cm in length and never exceeding 3 cm. Only the fundus (the portion to the left of the short gastrics) should be used; using the body of the stomach creates a tight wrap. Bougie calibration with a 52-56 Fr bougie ensures appropriate lumen size.

### Outcomes

Symptom relief ranges from 85-95% at 5 years, with patient satisfaction of 85-90%. Side effects include dysphagia (10-15%, usually transient), gas-bloat syndrome (5-10%), and inability to belch or vomit. The reoperation rate is 2-5% at 10 years.

## Partial Fundoplications

### Toupet (Posterior 270-Degree)

The Toupet fundoplication creates a posterior partial wrap sutured to both crura and the esophagus. It offers a lower dysphagia rate compared to Nissen while providing adequate reflux control. It is indicated for patients with weak esophageal peristalsis (IEM) or concerns about post-fundoplication dysphagia. Five-year reflux control ranges from 80-90%.

### Dor (Anterior 180-Degree)

The Dor fundoplication creates an anterior partial wrap folded over the anterior esophagus. It is primarily used after Heller myotomy for achalasia to cover the exposed mucosa and is less commonly used as a standalone antireflux procedure.

### Fundoplication Types Comparison

| Fundoplication | Degree of Wrap | Reflux Control | Dysphagia Rate | Primary Indication |
|---------------|---------------|---------------|----------------|-------------------|
| Nissen | 360° (complete) | 85-95% at 5 yr | 10-15% (usually transient) | Normal peristalsis |
| Toupet | 270° (posterior partial) | 80-90% at 5 yr | Lower than Nissen | Weak peristalsis (IEM) |
| Dor | 180° (anterior partial) | Lower than Nissen | Lowest | After Heller myotomy for achalasia |

### Evidence: Nissen vs. Partial

Multiple randomized controlled trials demonstrate comparable reflux control between Nissen and Toupet fundoplications. Nissen provides slightly better reflux control but slightly higher dysphagia rates, while Toupet is preferred for patients with impaired esophageal motility.

<image>Surgical technique comparison of Nissen (360-degree), Toupet (posterior 270-degree), and Dor (anterior 180-degree) fundoplications with cross-sectional views</image>

## Magnetic Sphincter Augmentation (LINX Device)

### Concept

The LINX device consists of a ring of titanium beads with magnetic cores placed around the GEJ. It augments LES pressure while opening with swallowing and belching, thereby preserving physiologic function. Laparoscopic implantation is performed without the need for fundal dissection.

### Indications

LINX is indicated for mild to moderate GERD with a small or absent hiatal hernia (less than 3 cm) and normal esophageal motility. It is not recommended for patients with large hiatal hernias, Barrett esophagus, or severe esophagitis.

### Outcomes

Short-to-medium term reflux control is comparable to fundoplication at 5 years, with lower rates of dysphagia and gas-bloat compared to Nissen. Importantly, the device allows belching and vomiting, which fundoplication does not. Device erosion is rare but requires explantation. The device is MRI compatible up to 1.5 Tesla.

## Roux-en-Y Gastric Bypass as Antireflux Procedure

Roux-en-Y gastric bypass should be considered for morbidly obese patients with GERD (BMI greater than 35), as it is the most effective antireflux operation in obese patients. Fundoplication in morbidly obese patients has higher failure rates. The procedure also addresses obesity-related comorbidities. It creates a small gastric pouch with a Roux limb that diverts bile and acid away from the esophagus.

## Failed Antireflux Surgery

### Causes of Failure

The most common causes of failed antireflux surgery include wrap disruption or herniation (the most common anatomic failure), slipped wrap (where the fundoplication migrates below the GEJ), a wrap that is too tight (causing persistent dysphagia), an incorrect initial diagnosis (functional heartburn rather than true GERD), hiatal hernia recurrence, and an inadequate initial operation.

### Evaluation of Failed Fundoplication

A comprehensive evaluation includes EGD to assess anatomy and mucosal injury, barium swallow to evaluate wrap position and hiatal hernia recurrence, HRM for motility assessment and LES function, pH/impedance monitoring to confirm pathologic reflux, and a gastric emptying study if delayed emptying is suspected.

### Reoperation

Redo fundoplication is technically demanding due to adhesions and distorted anatomy, and outcomes are inferior to primary surgery. Conversion to Roux-en-Y gastric bypass should be considered for multiply failed operations, especially in obese patients. Referral to an experienced esophageal center is advisable.

<image>Common anatomic patterns of failed fundoplication including wrap herniation above the diaphragm, slipped wrap, and wrap disruption shown on barium swallow</image>

## Clinical Pearls

Manometry before antireflux surgery is non-negotiable -- operating on achalasia with a fundoplication is a disaster. The best predictor of surgical success is a patient with typical symptoms (heartburn, regurgitation) and documented acid exposure on pH testing. A floppy, short Nissen wrap prevents the most common complaint of postoperative dysphagia. Patients with weak esophageal peristalsis should receive a partial (Toupet) fundoplication rather than a Nissen. Weight loss counseling should accompany any antireflux surgery plan because obesity drives GERD recurrence. LINX is a good option for patients with mild-moderate GERD who want to preserve the ability to belch and vomit. Failed fundoplication requires comprehensive re-evaluation before reoperation to ensure the diagnosis was correct in the first place.

## References
- Fuchs KH et al. "EAES recommendations for the management of gastroesophageal reflux disease." *Surg Endosc*. 2014.
- Dallemagne B et al. "Laparoscopic Nissen fundoplication: five-year results and beyond." *Ann Surg*. 2006.
- Ganz RA et al. "A new magnetic sphincter augmentation device (LINX) for GERD." *N Engl J Med*. 2013.
- Jobe BA et al. "Preoperative diagnostic workup before antireflux surgery." *Am J Gastroenterol*. 2013.
- Kahrilas PJ et al. "ACG Clinical Guideline: Diagnosis and Management of GERD." *Am J Gastroenterol*. 2022.
- Anvari M et al. "Five-year comprehensive outcomes evaluation in 181 patients after laparoscopic Nissen fundoplication." *J Am Coll Surg*. 2003.