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This prospective observational study investigated the association between PA and a composite in-hospital outcome in major abdominal surgery.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>Each patient underwent BIA before surgery (PA<jats:sub>pre<\/jats:sub>), immediately postoperatively (PA<jats:sub>post<\/jats:sub>), and 1 day postoperatively (PA<jats:sub>POD1<\/jats:sub>). Specific assessment for frailty and nutrition status was performed before surgery. Patient outcomes were assessed using a composite adverse outcome comprising death, myocardial infarction, revascularization, stroke, hemodynamic instability, acute kidney injury, pulmonary complications, delirium, ileus, and surgical complications during hospitalization. One-year complication, including all-cause mortality, myocardial infarction, stroke, surgical complications, and readmission after discharge within the year were also assessed.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>A total of 122 adults who underwent major abdominal surgery were enrolled from July 2019 and April 2021. Twenty-three patients (53.5%) in the lower PA group (PA\u2009&lt;\u20095) experienced in-hospital complications compared to 38 patients (34.2%) in the higher PA group (PA\u2009\u2265\u20095) (relative risk, 1.6; 95% confidence interval [CI], 1.0 to 2.4; <jats:italic>p<\/jats:italic>\u2009=\u20090.038). PA<jats:sub>pre<\/jats:sub> was significantly associated with in-hospital complications (odds ratio, 0.491; 95% CI, 0.279 to 0.862; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). Patients with lower PA<jats:sub>pre<\/jats:sub> had a higher degree of frailty, and poor nutritional status. However, PA<jats:sub>pre<\/jats:sub> was not significantly associated with 1-year composite complications.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>Low PA<jats:sub>pre<\/jats:sub> was associated with adverse postoperative outcomes after major abdominal surgery. PA can be a reliable prognostic factor to predict in-hospital complications in patients undergoing major abdominal surgery, serving as an alternative surrogate to frailty indices and nutritional markers.<\/jats:p>\n            <jats:p>\n              <jats:bold>Trial registration:<\/jats:bold> Clinical Research Information Services of the Republic of Korea (CRIS identifier: KCT0004160).<\/jats:p>\n          <\/jats:sec>","DOI":"10.1007\/s00540-025-03526-6","type":"journal-article","created":{"date-parts":[[2025,6,13]],"date-time":"2025-06-13T13:34:57Z","timestamp":1749821697000},"page":"750-759","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Phase angle as a prognostic factor for postoperative outcomes in major abdominal surgery: a single-center prospective observational study"],"prefix":"10.1007","volume":"39","author":[{"given":"Yu Jeong","family":"Bang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dawoon","family":"Jeong","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ji Hye","family":"Kwon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang Jin","family":"Park","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7584-2670","authenticated-orcid":false,"given":"Jeong\u2011Jin","family":"Min","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,6,13]]},"reference":[{"issue":"6","key":"3526_CR1","doi-asserted-by":"publisher","first-page":"538","DOI":"10.1001\/jamasurg.2015.5085","volume":"151","author":"DI McIsaac","year":"2016","unstructured":"McIsaac DI, Bryson GL, van Walraven C. 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