Diagnostic and Therapeutic Implications of Laryngopharyngeal Reflux When Endoscopy Is Normal

Prevalence of Normal Endoscopy in GERD

In the majority of patients with gastro‑esophageal reflux disease, esophagogastroduodenoscopy (EGD) appears normal because objective findings such as erosive esophagitis or Barrett’s esophagus are present only in a minority of cases. 1

Endoscopic findings do not reliably confirm or exclude that extra‑esophageal manifestations (e.g., laryngopharyngeal symptoms) are caused by reflux, making EGD an inappropriate tool for establishing causation. 1

Up to 75 % of individuals with laryngopharyngeal reflux lack classic gastrointestinal symptoms such as heartburn or acid regurgitation. 2
The laryngeal mucosa is markedly more sensitive to refluxate than esophageal tissue, so fewer reflux episodes are needed to generate symptoms. 2
Only about 6 % of otolaryngology patients with laryngopharyngeal reflux report heartburn, whereas virtually all experience hoarseness, illustrating the disconnect between esophageal and laryngeal manifestations. 2

Laryngoscopic examination alone has sensitivity and specificity below 50 % for diagnosing laryngopharyngeal reflux and shows substantial inter‑ and intra‑observer variability. 3

Ambulatory pH monitoring or combined pH‑impedance monitoring is the preferred diagnostic approach when laryngopharyngeal reflux is suspected, as these methods detect both acid and non‑acid reflux events that may not cause esophageal mucosal injury. 1
Weak‑acid (pH 4–7) or non‑acid (pH > 7) reflux can contribute to extra‑esophageal symptoms such as chronic cough and laryngeal irritation, which may be missed by standard acid‑only pH monitoring. 1

Empiric proton‑pump inhibitor therapy should not be initiated based solely on laryngoscopic findings, because such findings can be present in asymptomatic individuals or stem from non‑reflux etiologies. 4