Hiatal Hernia and Conclusive Gastroesophageal Reflux Disease: Size Matters

Background/Aims: The Lyon Consensus considers hiatal hernia (HH) as a supportive metric for the diagnosis of gastroesophageal reflux disease (GERD) when evidence is inconclusive; however, HH size is not taken into consideration.We aimed to correlate HH size with conclusive evidence of GERD from multichannel intraluminal impedance and pH monitoring (MII-pH) and upper endoscopy.Methods: We analyzed a retrospective consecutive cohort of patients with suspected GERD with and without HH on high-resolution manometry who also underwent upper endoscopy and MII-pH monitoring off therapy within a ≤6 month interval.HH was categorized as none, small (<3 cm), medium (3-5 cm), or large (>5 cm).Pathological acid exposure time (AET, >6%), endoscopic GERD findings, and adjunctive MII-pH metrics were compared and correlated between subsets based on the presence and size of HH.Results: Of the 456 included patients, 337 (73.9%) had HH as follows: small HH, 114; medium HH, 117; and large HH, 106.Pathological AET showed a stepwise increase from 19.3% in the no HH group to 41.2% in the small HH group, 51.3% in the medium HH group, and 83.0% in the large HH group (P < 0.001).The prevalence of erosive esophagitis increased similarly (7.6%, 14.9%, 17.9%, and 43.4%, respectively; P < 0.001).DeMeester score, total reflux episodes (TREs), and mean nocturnal baseline impedance (MNBI) showed similar findings (all P < 0.001), but the prevalence of peptic stricture (P = 0.263) and Barrett's esophagus did not differ significantly (P = 0.108).HH size correlated positively with AET (rho = 0.49) and TRE (rho = 0.53) and negatively with MNBI (rho = -0.46;all P < 0.001).Conclusions: Evidence for conclusive GERD increases with HH size, supporting its role as a key anatomical marker for GERD assessment using the Lyon Consensus 2.0 criteria.