What are the different types of Gastroesophageal Reflux Disease (GERD)?

Types of Gastroesophageal Reflux Disease (GERD)

GERD is classified into three distinct phenotypic categories: Non-Erosive Reflux Disease (NERD), Erosive Reflux Disease (ERD), and Barrett's Esophagus—these represent separate disease entities rather than a progressive spectrum. 1, 2

The Three Primary GERD Phenotypes

1. Non-Erosive Reflux Disease (NERD)

• NERD is the most common form of GERD, accounting for 30-70% of patients with reflux symptoms who have no visible mucosal damage on endoscopy 1, 3
• Patients experience typical reflux symptoms (heartburn, regurgitation) caused by gastric content reflux but show normal esophageal mucosa at endoscopy 1, 3
• Only 50% of NERD patients demonstrate pathologic esophageal acid exposure on 24-hour pH monitoring 3
• NERD can be further subdivided into:
  • True NERD with pathologic acid exposure 3
  • Esophageal hypersensitivity (physiologic acid exposure with good symptom-reflux correlation) 3
  • Functional heartburn (no symptom-reflux correlation) 3
• NERD patients suffer similar quality of life decrements as those with erosive disease 3

2. Erosive Reflux Disease (ERD)

• ERD is characterized by visible mucosal breaks or erosions on endoscopy, typically classified using the Los Angeles grading system (grades A through D) 1
• Patients with ERD have, on average, more severe or protracted reflux symptoms than those with NERD, though significant symptom overlap exists between groups 1
• Los Angeles grades C and D esophagitis are considered highly specific for GERD 1
• ERD mandates aggressive lifelong treatment due to inevitable relapse without appropriate therapy 4
• Risk factors for ERD include male gender, overweight, regular alcohol use, GERD history >1 year, and smoking 5

3. Barrett's Esophagus

• Barrett's esophagus represents a metaplastic change where specialized columnar epithelium replaces normal squamous epithelium 1, 6
• The Asia-Pacific consensus (2016) revised the definition to require a minimum length of 1 cm of columnar-lined esophagus 1
• In the United States, diagnosis requires both endoscopic visualization of at least 1 cm of metaplastic columnar epithelium and biopsy confirmation of intestinal metaplasia with goblet cells 6
• Approximately 10% of patients with chronic GERD symptoms have Barrett's esophagus 6
• Barrett's esophagus is the only known precursor lesion to esophageal adenocarcinoma, though the absolute cancer risk remains very low (0.00039-0.00065 cases per patient annually) 1, 6

Critical Clinical Distinctions

These Are NOT Progressive Stages

• Current evidence demonstrates very little movement between these three categories—they represent distinct phenotypes rather than a disease continuum 1, 2
• The traditional "spectrum of disease" concept (where NERD progresses to ERD, then to Barrett's) is not supported by available data 1, 2
• Progression from NERD to severe ERD (Los Angeles C or D) or Barrett's esophagus is possible but uncommon 3
• In patients with healed mucosa at index endoscopy, the likelihood of developing Barrett's, stricture, or adenocarcinoma within 7 years is 0.0%, 1.9%, and 0.1% respectively 1

Extraesophageal GERD Manifestations

• GERD can present with atypical extraesophageal symptoms including chronic cough, laryngitis, and asthma, though a direct causal link is often lacking 1, 7
• These extraesophageal presentations do not represent a separate "type" of GERD but rather different symptom manifestations 1
• Diagnosis of extraesophageal GERD is challenging due to lack of specific diagnostic tests 1

Pediatric GERD Classifications

• In infants (<1 year), GERD manifests as regurgitation with irritability, feeding refusal, poor weight gain, and back arching during feeds 1
• In children >1 year and adolescents, symptoms more closely resemble adult presentations with heartburn and regurgitation 1
• High-risk pediatric populations include those with neurologic impairment, obesity, repaired esophageal atresia, and chronic respiratory disorders 1

Common Pitfalls to Avoid

• Do not assume symptom severity predicts endoscopic findings—there is only moderate correlation between reflux symptoms and esophageal acid exposure or mucosal injury 1, 5
• Do not perform routine endoscopic screening in all GERD patients—insufficient evidence exists to show that screening decreases cancer incidence or increases life expectancy 1, 6
• Do not diagnose extraesophageal GERD based on laryngoscopy findings alone—these findings lack specificity and can be present in asymptomatic individuals 1
• Do not expect all GERD patients to respond equally to PPI therapy—NERD patients are less likely to respond to acid suppression than ERD patients 1, 3