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The Lyon Consensus: Does It Differ From the Previous Ones?

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Gastroesophageal reflux disease (GERD) diagnosis requires more than clinical history. The Lyon Consensus defines endoscopic and functional parameters for accurate GERD identification and tailored patient management.

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Area of Science:

  • Gastroenterology
  • Digestive Diseases
  • Esophageal Disorders

Background:

  • Gastroesophageal reflux disease (GERD) presents complex, heterogeneous symptoms, hindering simple diagnosis and classification.
  • Clinical history, questionnaires, and proton pump inhibitor (PPI) response are often insufficient for definitive GERD diagnosis, necessitating further investigation.

Purpose of the Study:

  • To present the Lyon Consensus guidelines for diagnosing GERD.
  • To define endoscopic and functional parameters for establishing GERD presence.
  • To guide tailored management strategies based on patient phenotype.

Main Methods:

  • The Lyon Consensus integrates endoscopic findings (erosive esophagitis, Barrett's esophagus, strictures) and functional tests (pH-metry, pH-impedance monitoring).
  • Key functional metrics include esophageal acid exposure time, reflux-symptom association, and impedance parameters (e.g., mean nocturnal baseline impedance).
  • Adjunctive evidence from biopsies and high-resolution manometry is considered when primary investigations are inconclusive.

Main Results:

  • High-grade erosive esophagitis, Barrett's esophagus, or strictures on endoscopy, alongside esophageal acid exposure >6% via pH-metry/impedance, confirm GERD.
  • Normal endoscopy with distal acid exposure <4% on off-PPI monitoring refutes GERD.
  • Reflux-symptom association on pH-monitoring supports reflux-triggered symptoms and predicts treatment response.

Conclusions:

  • The Lyon Consensus provides a framework for GERD diagnosis using objective endoscopic and functional parameters.
  • A combination of investigations, including advanced impedance metrics and manometry, aids in complex cases.
  • Phenotyping GERD patients based on reflux characteristics and individual factors enables personalized treatment approaches.