Laryngopharyngeal Reflux (LPR)

Table of Contents

  1. What Is LPR?
  2. How LPR Differs from GERD
  3. Causes and Risk Factors
  4. Symptoms (RSI — Reflux Symptom Index)
  5. Laryngoscopy Findings (Reflux Finding Score)
  6. Diagnosis
  7. Dietary and Lifestyle Changes
  8. Medications (PPIs and Beyond)
  9. When Surgery Is Needed
  10. Research Papers
  11. Connections
  12. Featured Videos

What Is LPR?

LPR (laryngopharyngeal reflux) is the backflow of gastric contents — stomach acid, pepsin, and bile — past the upper esophageal sphincter into the larynx and pharynx. Unlike typical heartburn (GERD), LPR often occurs without any burning sensation in the chest. Gastroenterologists and ENT specialists call it "silent reflux" because patients frequently have no classic reflux symptoms, yet the laryngeal tissues suffer significant chemical injury with every reflux event.

The larynx (voicebox) is exquisitely sensitive to stomach acid and especially to pepsin. While the esophagus can tolerate some acid exposure, a single drop of pepsin-containing fluid on the vocal cords can trigger hours of irritation, mucus production, and swelling. This extreme sensitivity is the defining feature of LPR.

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How LPR Differs from GERD

GERD (gastroesophageal reflux disease) and LPR share the same underlying mechanism — a weakened lower esophageal sphincter allowing gastric fluid to reflux upward — but they differ in important ways:

The pepsin protein plays a central and underappreciated role. Pepsin (a digestive enzyme) remains bound to laryngeal tissues even after acid is neutralized and becomes reactivated at low pH, causing ongoing damage long after reflux events end. Salivary pepsin assays are now being studied as diagnostic biomarkers.

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Causes and Risk Factors

The primary cause is dysfunction of the upper and lower esophageal sphincters, allowing gastric contents to reach the throat. Contributing factors include:

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Symptoms (RSI — Reflux Symptom Index)

The Reflux Symptom Index (RSI), developed by Belafsky et al. in 2002, is a validated 9-item questionnaire for diagnosing LPR. Each symptom is rated 0–5 (0 = no problem, 5 = severe); a total score above 13 is considered abnormal and suggests LPR.

The nine RSI symptoms:

  1. Hoarseness or a problem with your voice — intermittent dysphonia, often worst in the morning after overnight recumbency
  2. Clearing your throat — the pathognomonic complaint; habitual, involuntary clearing from laryngeal irritation and mucus accumulation
  3. Excess throat mucus or postnasal drip — thick, sticky mucus coating the posterior pharynx
  4. Difficulty swallowing food, liquids, or pills — mild dysphagia from laryngeal edema
  5. Coughing after eating or after lying down — pepsin stimulates cough receptors in the larynx
  6. Breathing difficulties or choking episodes — laryngospasm can occur in severe LPR
  7. Troublesome or annoying cough — persistent dry cough, often misdiagnosed as post-viral or ACE-inhibitor cough
  8. Sensations of something sticking in your throat or a lump in your throat — globus sensation; distinct from dysphagia; food passes normally but the feeling of a lump persists
  9. Heartburn, chest pain, indigestion, or stomach acid coming up — present in only 40% of LPR patients; its absence does NOT rule out LPR

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Laryngoscopy Findings (Reflux Finding Score)

The Reflux Finding Score (RFS), also developed by Belafsky et al., uses laryngoscopic findings to grade LPR severity. An RFS above 7 is considered abnormal. Key findings:

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Diagnosis

LPR diagnosis relies on a combination of symptom assessment, laryngoscopy, and selected testing:

Clinical assessment: RSI score >13 combined with RFS >7 on laryngoscopy has good diagnostic sensitivity in patients with typical presentations. Many ENT specialists begin empirical treatment based on clinical findings alone.

24-hour ambulatory pH monitoring: The traditional gold standard. A dual-probe pH catheter measures acid exposure at the esophagus and pharynx simultaneously. The DeMeester score quantifies esophageal acid burden. Limitations: a normal study does not exclude LPR because pepsin and bile (non-acid components) can damage the larynx without lowering pH.

Multichannel intraluminal impedance-pH (MII-pH) monitoring: Superior to pH alone; detects acid, weakly acidic, and non-acid reflux events as well as gas reflux. This is the most sensitive test for LPR, especially in patients on PPI therapy.

Flexible laryngoscopy: Allows direct visualization of LPR signs. RFS scoring provides an objective baseline and allows treatment monitoring.

Empirical PPI trial: In uncomplicated presentations with RSI >13, many clinicians give a twice-daily PPI trial for 8–12 weeks and assess symptomatic response. This approach is cost-effective but should not replace laryngoscopy in patients with persistent hoarseness, suspected malignancy, or risk factors for laryngeal cancer.

Salivary pepsin assay (Peptest): A point-of-care lateral flow test detecting pepsin in saliva. Increasingly used in clinical practice, particularly in the UK; sensitivity ~65–80% for LPR diagnosis; a positive result with compatible symptoms supports LPR diagnosis.

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Dietary and Lifestyle Changes

Behavioral modification is the cornerstone of LPR treatment — often as effective as PPIs in mild-moderate cases, with no side effects:

Diet:

Lifestyle:

The alkaline water debate: Some clinicians recommend alkaline water (pH 8.8) because it denatures pepsin irreversibly in vitro. Clinical evidence is limited, but alkaline water is harmless and may provide modest benefit.

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Medications (PPIs and Beyond)

Proton pump inhibitors (PPIs):

PPIs are the standard pharmacological treatment for LPR. Key points:

H2 receptor antagonists (H2RAs):

Ranitidine has been withdrawn; famotidine (Pepcid) is the preferred H2RA. Less potent than PPIs but may help nocturnal acid breakthrough when added to PPI therapy at bedtime.

Alginate-based agents:

Gaviscon Advance (sodium alginate) forms a physical raft on top of the gastric contents, blocking reflux mechanically. Particularly useful for pepsin-mediated LPR and for patients who cannot tolerate PPIs. Good evidence in European trials.

Prokinetics:

Metoclopramide or domperidone (limited US availability) increase LES pressure and accelerate gastric emptying, reducing reflux volume. Used as adjuncts in refractory cases.

Voice therapy:

Counterintuitively, voice therapy with a speech-language pathologist is recommended for LPR patients with significant dysphonia. Techniques to reduce effortful vocal behavior, eliminate throat clearing habits, and optimize vocal hygiene complement medical therapy.

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When Surgery Is Needed

Surgical fundoplication is reserved for carefully selected patients who:

Laparoscopic Nissen fundoplication: The LES is reinforced by wrapping the gastric fundus completely around the lower esophagus. Success rate for eliminating reflux exceeds 90% in properly selected patients. However, LPR symptoms (vs classic GERD) may have a lower surgical success rate, possibly because some "LPR" presentations involve extra-esophageal hypersensitivity rather than true reflux.

Laparoscopic Toupet fundoplication: A partial (270°) wrap; lower risk of post-operative dysphagia compared to Nissen, with similar reflux control.

LINX device: A ring of magnetic beads implanted around the LES to augment sphincter pressure; FDA-approved; reversible; growing evidence for GERD, more limited data for LPR specifically.

Patients should expect ongoing voice therapy and dietary compliance even after successful surgery.

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Research Papers

  1. Belafsky PC et al. "Validity and reliability of the reflux symptom index (RSI)." J Voice. 2002 Jun;16(2):274-7. PMID: 12150380
  2. Belafsky PC et al. "The validity and reliability of the reflux finding score (RFS)." Laryngoscope. 2001 Aug;111(8):1313-7. PMID: 11568561
  3. Koufman JA. "The otolaryngologic manifestations of gastroesophageal reflux disease (GERD): a clinical investigation of 225 patients using ambulatory 24-hour pH monitoring and an experimental investigation of the role of acid and pepsin in the development of laryngeal injury." Laryngoscope. 1991 Apr;101(4 Pt 2 Suppl 53):1-78. PMID: 2010898
  4. Johnston N et al. "Activity/stability of human pepsin: implications for reflux attributed laryngeal disease." Laryngoscope. 2007 Jun;117(6):1036-9. PMID: 17417107
  5. Joniau S et al. "Contribution of reflux to throat symptoms: a prospective study." Ann Otol Rhinol Laryngol. 2007 Jun;116(6):387-93. PMID: 17638369
  6. Martinucci I et al. "Optimal treatment of laryngopharyngeal reflux disease." Ther Adv Chronic Dis. 2013 Nov;4(6):287-301. PMID: 24179671
  7. Worrell SG et al. "Efficacy of laparoscopic fundoplication for extra-esophageal manifestations of GERD." Surg Endosc. 2018 May;32(5):2117-2123. PMID: 28986700
  8. McGlashan JA et al. "The value of salivary pepsin in the diagnosis of gastro-oesophageal reflux disease." Clin Otolaryngol. 2009 Feb;34(1):19-23. PMID: 19260908
  9. Reichel O et al. "Double-blind, placebo-controlled trial with esomeprazole for symptoms and signs associated with laryngopharyngeal reflux." Otolaryngol Head Neck Surg. 2008 Aug;139(3):414-20. PMID: 18722986
  10. Vaezi MF et al. "Esomeprazole in the treatment of chronic laryngitis: a randomized, placebo-controlled trial." Am J Gastroenterol. 2006 Jul;101(7):1545-52. PMID: 16863556
  11. Lam PK et al. "Contributions of evidence from randomized controlled trials to the understanding of laryngopharyngeal reflux." J Voice. 2016 Jan;30(1):106-13. PMID: 25958196
  12. Yadlapati R et al. "Ambulatory reflux monitoring for diagnosis of gastroesophageal reflux disease: update of the Porto consensus and recommendations from an international consensus group." Neurogastroenterol Motil. 2021 Jul;33(7):e14089. PMID: 33822453

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Connections

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