Gastroesophageal Reflux Disease (GERD) 2

SUMMARY

Gastroesophageal reflux disease (GERD) is a chronic disorder in which reflux of gastric contents into the esophagus causes troublesome symptoms, mucosal injury, or extraesophageal complications. It reflects failure of a multicomponent antireflux barrier — not simply a weak lower esophageal sphincter (LES) — with the balance tipped toward aggressive factors (acid, pepsin, bile) over protective mechanisms (LES, diaphragmatic crura, esophageal clearance, mucosal defense).

The dominant mechanism in most patients is transient LES relaxations (TLESRs), amplified by obesity, sliding hiatal hernia, delayed gastric emptying, and impaired esophageal clearance. Typical symptoms are heartburn and acid regurgitation; atypical/extraesophageal presentations include chronic cough, hoarseness, and asthma. The feared trajectory is chronic esophagitis → peptic stricture → Barrett esophagus → esophageal adenocarcinoma.

Diagnosis is usually clinical, with a PPI trial as first-line therapy. Upper endoscopy is reserved for alarm features and is the gold standard for mucosal complications; 24-hour ambulatory pH monitoring is the gold standard for confirming pathologic acid reflux. Proton pump inhibitors (PPIs) are the most effective medical treatment, and laparoscopic Nissen fundoplication is the standard antireflux operation for medically refractory disease with normal esophageal motility. For a compact overview of mechanism, manifestations, and initial treatment, see the GERD pathophysiology, manifestations, and initial-treatment overview.

Definition, Epidemiology & Risk Factors

Definition

GERD develops when reflux of gastric contents produces troublesome symptoms and/or mucosal injury because the normal antireflux barrier fails and aggressive factors (acid, pepsin, bile salts, pancreatic enzymes) overwhelm protective mechanisms (LES tone, diaphragmatic crura, esophageal peristalsis, salivary bicarbonate, mucosal defense).

Epidemiology

• One of the most common GI disorders worldwide, affecting 10–20% of adults in Western populations.
• Incidence is rising, driven largely by obesity and aging; prevalence is similar in men and women.
• Barrett esophagus and adenocarcinoma cluster in white males > 50 years.

Risk factors (highest-yield)

Truncated to the most commonly tested contributors: central obesity, sliding hiatal hernia, pregnancy, and smoking/alcohol. Scleroderma is the classic connective-tissue cause (LES smooth-muscle atrophy and fibrosis). Among drugs, the ones that lower LES tone and are repeatedly tested are calcium-channel blockers, nitrates, and anticholinergics.

Pathophysiology & The Antireflux Barrier

GERD results from failure of a multicomponent antireflux barrier rather than a defect in the LES alone. When several of these components fail together, reflux frequency and duration rise and the esophagus is repeatedly bathed in acid.

The GE junction anatomy — and how it is distorted by a hiatal hernia — is best appreciated visually:

Why the LES fails

1. Transient LES relaxations (TLESRs) — the most common mechanism. These are relaxations not triggered by swallowing; they are provoked by gastric fundus distension, are physiologic during belching, and cause reflux when they become excessively frequent.

2. Hypotensive LES — inadequate resting pressure from obesity, smoking, scleroderma, or LES-relaxing drugs.

Hiatal hernia and reflux

A sliding (Type I) hiatal hernia is strongly linked to GERD: the GEJ migrates above the diaphragm, separating the LES from the crura, lowering LES pressure, increasing TLESRs, and creating a supradiaphragmatic acid pocket with impaired clearance. Paraesophageal hernias cause trouble mainly through mechanical complications rather than reflux.

The injury cascade

LES dysfunction + hiatal hernia + delayed gastric emptying + impaired esophageal clearance + acid/bile reflux → repeated mucosal injury → esophagitis → ulceration → stricture / Barrett esophagus → adenocarcinoma.

Clinical Features & Diagnosis

Typical symptoms

Heartburn and acid regurgitation are the hallmark features, classically worse after meals and when supine. Also seen: water brash (reflex salivation), and — as later/complication features — dysphagia and odynophagia.

Extraesophageal symptoms (highest-yield)

Reflux can present without heartburn ("silent GERD"). The most commonly tested atypical presentations are chronic cough, hoarseness/laryngitis, and asthma; dental enamel erosion is a classic exam clue.

Alarm symptoms

Any alarm feature mandates prompt upper GI endoscopy to exclude malignancy, stricture, or ulceration — do not simply escalate acid suppression.

Diagnostic work-up (by modality)

GERD is largely a clinical diagnosis; a symptomatic response to a PPI trial supports it. Objective testing is reserved for alarm features, atypical/refractory symptoms, or preoperative evaluation:

• Upper endoscopy (EGD): gold standard for mucosal complications — esophagitis, Barrett esophagus, stricture, and cancer; enables biopsy.
• Ambulatory 24-hour pH monitoring: gold standard for confirming pathologic acid reflux; used when endoscopy is normal and always before antireflux surgery.
• High-resolution manometry: assesses LES pressure and esophageal motility; mandatory before surgery to exclude achalasia and major motility disorders.
• Barium swallow: defines anatomy — hiatal hernia, stricture, and short esophagus.

Complications

1. Reflux esophagitis

Acid-induced mucosal inflammation presenting with heartburn, chest pain, and dysphagia; ulceration and bleeding may follow. The classic histologic triad is elongated lamina propria papillae, intraepithelial eosinophils/neutrophils, and basal-zone hyperplasia.

2. Peptic stricture

Chronic inflammation → fibrosis → luminal narrowing, presenting with progressive dysphagia to solids. On barium the narrowing is concentric and symmetric (contrast with the asymmetric, irregular narrowing of cancer). Treat with endoscopic dilation + PPI therapy.

3. Barrett esophagus (metaplastic complication)

Replacement of normal stratified squamous epithelium by intestinal-type columnar epithelium with goblet cells — the principal premalignant lesion of chronic GERD. Diagnosis requires upper endoscopy + biopsy confirming specialized intestinal metaplasia. Risk factors mirror adenocarcinoma: long-standing GERD, male sex, white race, age >50, central obesity, and smoking. Endoscopically it appears as salmon-pink tongues extending above the Z-line.

Surveillance intensity is dictated by the highest grade of dysplasia found:

4. Esophageal adenocarcinoma (neoplastic complication)

The metaplasia–dysplasia–carcinoma sequence: GERD → Barrett → low-grade → high-grade dysplasia → invasive adenocarcinoma, most commonly involving the distal esophagus and GEJ. Presents with progressive dysphagia, weight loss, odynophagia, and GI bleeding.

5. Respiratory / extraesophageal complications

Two mechanisms: microaspiration of acid into the airway → inflammation, chronic cough, bronchospasm, and aspiration pneumonia; and a vagal reflex from acid in the distal esophagus → bronchoconstriction. Manifestations include asthma, chronic cough, laryngitis/hoarseness, chronic sinusitis, and dental erosion.

Management (Medical & Surgical)

Lifestyle modification (first step)

Highest-yield measures: weight loss, smoking cessation, elevating the head of the bed, and avoiding meals within 2–3 hours of sleep plus trigger foods (fatty meals, alcohol, caffeine, chocolate, peppermint) and tight clothing.

Pharmacologic therapy

Proton pump inhibitors (PPIs) — first-line. Examples: omeprazole, pantoprazole, esomeprazole, rabeprazole. They deliver the most effective acid suppression, heal erosive esophagitis, relieve symptoms, and prevent recurrence. They act at the final common pathway of acid secretion — the H⁺/K⁺-ATPase proton pump — which is why they outperform H2 blockers that block only the histamine limb.

• H2-receptor blockers (famotidine, cimetidine): less effective than PPIs; useful for mild disease or nocturnal symptoms.
• Antacids: rapid symptom relief, no mucosal healing.
• Alginates: form a floating raft over gastric contents to reduce postprandial reflux.
• Prokinetics (metoclopramide): increase gastric emptying and LES tone; limited by adverse effects.
• Baclofen: reduces TLESRs; used in refractory reflux but limited by CNS side effects.

Step-up therapeutic approach

1. Step 1: Institute lifestyle modification for typical GERD symptoms; escalate if symptoms persist.
2. Step 2: Start a once-daily PPI for 8 weeks and reassess at completion.
3. Step 3: If symptoms resolve → continue the lowest effective dose. If they persist → proceed to upper endoscopy ± ambulatory pH monitoring, and consider antireflux surgery if objective GERD is confirmed.

Surgical therapy

Indications: failure of medical therapy, patient preference to avoid lifelong PPIs, severe regurgitation, large hiatal hernia, complications (stricture, recurrent aspiration), and objective evidence of GERD. The ideal candidate has typical reflux symptoms, an excellent PPI response, objectively documented reflux, and normal or correctable esophageal motility.

Preoperative evaluation combines upper endoscopy, high-resolution manometry, and ambulatory pH monitoring (barium swallow and gastric-emptying study in selected patients). The surgical goals are to restore an intra-abdominal esophagus, repair the hiatal defect, and reconstruct the LES without causing obstruction.

The individual antireflux operations, their ideal candidate, and their characteristic complications are consolidated here:

Laparoscopic Nissen fundoplication achieves symptom relief in 85–95% of appropriately selected patients. Early complications include dysphagia, bleeding, and esophageal/gastric perforation; late complications include gas-bloat syndrome, wrap migration, recurrent hiatal hernia, recurrent GERD, and a slipped or disrupted wrap.

Antireflux surgery in Barrett esophagus

Fundoplication controls reflux, heals esophagitis, and may stabilize Barrett mucosa — but it does not reliably reverse Barrett or eliminate the adenocarcinoma risk, so endoscopic surveillance must continue after a successful operation.

Key Points for Exams

The single table below distills every commonly tested "one-liner" for GERD — mechanism, gold-standard tests, best medical and surgical options, and the two feared complications.