**Question:** GERD in the absence of endoscopic esophagitis is seen in:

**Core Concept:** GERD (Gastroesophageal Reflux Disease) is a common gastrointestinal disorder characterized by the regurgitation of gastric contents into the esophagus, leading to symptoms and complications. Endoscopic esophagitis refers to inflammation of the esophagus seen on endoscopy.

**Why the Correct Answer is Right:** The correct answer is **B. LES (Lower Esophageal Sphincter) dysfunction** as it is the primary mechanism in patients with GERD without endoscopic esophagitis. In these cases, the lower esophageal sphincter does not function properly, allowing gastric acid to reflux into the esophagus and cause symptoms of GERD.

**Why Each Wrong Option is Incorrect:**

A. **Barrett's Esophagus (Option C):** Although a complication of long-standing GERD, it is not the primary reason for GERD symptoms in patients without endoscopic esophagitis.

D. **H2 Receptor Antagonist Use (Option D):** H2 receptor antagonist use does not explain GERD in patients without endoscopic esophagitis, as it is a therapeutic intervention, not a cause of GERD.

**Clinical Pearl:** In cases of GERD without endoscopic esophagitis, physicians should focus on evaluating and treating lower esophageal sphincter dysfunction rather than endoscopic findings alone. This is crucial for providing appropriate management and preventing unnecessary endoscopies and complications of GERD, such as Barrett's esophagus and esophageal adenocarcinoma.

**Correct Answer:**

**Correct Answer: B. LES dysfunction**

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