• Morgan Manasa, Katie Galvin, Fazl AlizadehRezaRDepartment of Surgery, University of California, Irvine Medical Center, Orange, CA., Perisa Ruhi-Williams, Alyssa Choi, Jason Samarasena, Kenneth Chang, and Ninh T Nguyen.
• Department of Surgery, University of California, Irvine Medical Center, Orange, CA.
• J. Am. Coll. Surg. 2024 Mar 29.

BackgroundThe Hill classification characterizes the geometry of gastroesophageal junction (GEJ) and Hill grades (HGs) III and IV have a high association with pathologic reflux. This study aimed to understand the utilization of the Hill classification and correlate the prevalence of pathologic reflux across different HGs.Study DesignA retrospective review of 477 patients who underwent upper endoscopy and BRAVO™ pH monitoring between 8/2018 and 10/2021 was performed. These charts were reviewed for endoscopic finding for hiatal hernia and association of HGs with pathologic reflux, defined as an abnormal esophageal acid exposure time (AET) of ≥4.9%.ResultsOf 477 patients, 252 (52.8%) had a HG documented on the endoscopy report. Of the 252 patients, 61 had HG I (24.2%); 100 had HG II (39.7%); 61 had HG III (24.2%); and 30 had HG IV (11.9%). The proportion of patients with abnormal AET increases with increasing HGs (p<0.001): I (39.3%), II (52.5%), III (67.2%), IV (79.3%). The mean overall AET are as follow: HG I (5.5 ± 6.0%), HG II (7.0 ± 5.9%), HG III (10.2 ± 10.3%), and HG IV (9.5 ± 5.5%). The proportion of patients with hiatal hernia was 18.0% for HG I, 28.0% for HG II, 39.3% for HG III, and 80.0% for HG IV.ConclusionsUse of the Hill classification in clinical practice is low. There is an association of increasing HGs with increasing proportion of patients with abnormal AET. There is a high proportion of patients within HG I & II with documented pathologic reflux and the presence of a hiatal hernia as observed on endoscopic exam. Our study suggests that endoscopic grading of the GEJ may not adequately differentiate between normal versus abnormal reflux status, particularly for HG I and II.Copyright © 2024 by the American College of Surgeons. Published by Wolters Kluwer Health, Inc. All rights reserved.

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