GI Endoscopy · 1 min read
Los Angeles (LA) Classification of Erosive Esophagitis
Clinical Bottom Line
| LA Grade | Endoscopic Definition of Mucosal Erosion | Therapeutic Implication |
|---|---|---|
| Grade A | One or more mucosal breaks ≤ 5 mm long. | Extremely common; usually responds perfectly to standard once-daily PPI therapy. |
| Grade B | At least one break > 5 mm, but not spanning between two mucosal folds. | Clear evidence of pathologic acid exposure; PPI optimization required. |
| Grade C & D | Massive confluent erosions spanning between folds (C) or involving >75% of the circumference (D). | High risk for stricture formation or Barrett's; frequently requires step-up to PCABs (e.g., Vonoprazan) or anti-reflux surgery. |
Standardizing the Severity of Acid Reflux
While many patients report severe heartburn, standard EGDs frequently reveal a completely visually normal esophagus (Non-Erosive Reflux Disease, NERD). When the acid successfully burns through the squamous defense mechanisms, it generates distinct, fiery-red mucosal erosions. The Los Angeles (LA) Classification is the universally mandated lexicon for communicating the severity of these physical erosions.
The Clinical Weight of Severe Erosion
Differentiating between LA Grade A and LA Grade D is not merely academic grading; it dictates long-term management. Mild Grade A esophagitis often resolves entirely, allowing patients to successfully taper off their PPIs. In stark contrast, a patient presenting with LA Grade D esophagitis (massive, circumferential ulceration of the lower esophagus) possesses a profoundly incompetent lower esophageal sphincter (LES). Grade D patients frequently require indefinite, high-dose acid suppression (or novel Potassium-Competitive Acid Blockers like Vonoprazan) and are at extreme risk for developing dense fibrostenotic strictures that require balloon dilation.
Clinical guidelines summarized by the Gastroscholar Research Team. Last updated: 2026. This article is intended for physicians.
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