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The search terms were selected for each search engine to optimize the published literature and meet the inclusion criteria. The modified AXIS was used as a critical appraisal tool to assess the quality of studies.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Thirty\u2010three studies performing preoperative esophageal manometry \u00b1 pH studies or both were identified. Various manometric abnormalities have been described by the authors depending on the type of technique used. Twenty\u2010two studies undertook a 24\u2010hour ambulatory pH study to identify abnormal acid exposure. Twenty studies performed preoperative gastroscopy. The incidence of hiatal hernia varied from 5.4% to 52.6%, and reflux esophagitis from 4.4% to 42%.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The preoperative prevalence of PEMD and GERD was significant in patients with morbid obesity. This implies that the selection of the most appropriate bariatric procedure needs to be tailored not only for weight reduction but also for the prevention of further deterioration in esophageal motor function and GERD and its future consequences, such as Barrett's esophagus, erosive esophagitis, and esophageal adenocarcinoma, in both the short and long term.<\/jats:p><\/jats:sec>","DOI":"10.1111\/obr.13924","type":"journal-article","created":{"date-parts":[[2025,3,29]],"date-time":"2025-03-29T15:23:51Z","timestamp":1743261831000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Contemporary esophageal physiological testing for primary esophageal motility disorder (PEMD) and gastroesophageal reflux disease (GERD) before bariatric surgery: A systematic literature review"],"prefix":"10.1111","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2589-2338","authenticated-orcid":false,"given":"Muhammed 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