RT Journal Article SR Electronic T1 Updates to the modern diagnosis of GERD: Lyon consensus 2.0 JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 361 OP 371 DO 10.1136/gutjnl-2023-330616 VO 73 IS 2 A1 Gyawali, C Prakash A1 Yadlapati, Rena A1 Fass, Ronnie A1 Katzka, David A1 Pandolfino, John A1 Savarino, Edoardo A1 Sifrim, Daniel A1 Spechler, Stuart A1 Zerbib, Frank A1 Fox, Mark R A1 Bhatia, Shobna A1 de Bortoli, Nicola A1 Cho, Yu Kyung A1 Cisternas, Daniel A1 Chen, Chien-Lin A1 Cock, Charles A1 Hani, Albis A1 Remes Troche, Jose Maria A1 Xiao, Yinglian A1 Vaezi, Michael F A1 Roman, Sabine YR 2024 UL http://gut.bmj.com/content/73/2/361.abstract AB The Lyon Consensus provides conclusive criteria for and against the diagnosis of gastro-oesophageal reflux disease (GERD), and adjunctive metrics that consolidate or refute GERD diagnosis when primary criteria are borderline or inconclusive. An international core and working group was assembled to evaluate research since publication of the original Lyon Consensus, and to vote on statements collaboratively developed to update criteria. The Lyon Consensus 2.0 provides a modern definition of actionable GERD, where evidence from oesophageal testing supports revising, escalating or personalising GERD management for the symptomatic patient. Symptoms that have a high versus low likelihood of relationship to reflux episodes are described. Unproven versus proven GERD define diagnostic strategies and testing options. Patients with no prior GERD evidence (unproven GERD) are studied using prolonged wireless pH monitoring or catheter-based pH or pH-monitoring off antisecretory medication, while patients with conclusive GERD evidence (proven GERD) and persisting symptoms are evaluated using pH-impedance monitoring while on optimised antisecretory therapy. The major changes from the original Lyon Consensus criteria include establishment of Los Angeles grade B oesophagitis as conclusive GERD evidence, description of metrics and thresholds to be used with prolonged wireless pH monitoring, and inclusion of parameters useful in diagnosis of refractory GERD when testing is performed on antisecretory therapy in proven GERD. Criteria that have not performed well in the diagnosis of actionable GERD have been retired. Personalisation of investigation and management to each patient’s unique presentation will optimise GERD diagnosis and management.