{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T01:17:16Z","timestamp":1778635036816,"version":"3.51.4"},"reference-count":24,"publisher":"BMJ","issue":"5","funder":[{"name":"Department of Anesthesiology, University of North Carolina at Chapel Hill"}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["Reg Anesth Pain Med"],"accepted":{"date-parts":[[2025,5,22]]},"published-print":{"date-parts":[[2026,5]]},"abstract":"<jats:sec>\n                    <jats:title>Background and aims<\/jats:title>\n                    <jats:p>Ultrasound estimation of gastric volume is useful preoperatively for identifying those at increased risk of aspiration; however, studies to date have excluded subjects with prior gastric surgeries. We aimed to assess the performance of the current equation used in non-pregnant adults for patients who had undergone gastric sleeve and develop a new equation for this population if necessary. Secondarily, we determined if a 2-hour fast from clear fluids is sufficient to empty the stomach in this population.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>37 subjects who had undergone a gastric sleeve in the last 10 years were randomly assigned to drink 100, 200 or 300\u2009mL of water after fasting 8\u2009hours from solids and 2\u2009hours from clear fluids. Pre-drink and 0, 30, 60, 90 and 120\u2009min post-drink scans measured antral grade and cross-sectional area. Subjects participated in up to three study visits drinking different volumes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The existing equation was statistically suboptimal. A new equation was created with variables identified by LASSO regression (Volume (mL)=15.5\u00d7CSA (cm\n                      <jats:sup>2<\/jats:sup>\n                      )\u22120.28\u00d7Weight (kg)\u22120.75\u00d7Height (cm)+97.9) with a mean bias of &lt;1\u2009mL (95% limits of agreement \u221251.2 to 51.2\u2009mL). After 120\u2009min, 93.2% of post-drink scans were grade 0, and all had a calculated volume &lt;1.5\u2009mL\/kg.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The existing equation is likely still best suited for clinical use; however, the equation proposed here has superior accuracy in patients with prior gastric sleeve. A 2-hour fast from clear fluids is sufficient in this population.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/rapm-2025-106570","type":"journal-article","created":{"date-parts":[[2025,6,4]],"date-time":"2025-06-04T05:32:31Z","timestamp":1749015151000},"page":"485-490","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["Developing a method for ultrasound estimation of gastric volume in patients with previous gastric sleeve"],"prefix":"10.1136","volume":"51","clinical-trial-number":[{"clinical-trial-number":"nct06533046","registry":"10.18810\/clinical-trials-gov"}],"author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-6572-2636","authenticated-orcid":false,"given":"Jacob R","family":"Wrobel","sequence":"first","affiliation":[{"name":"Anesthesiology, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8663-5044","authenticated-orcid":false,"given":"Justin C","family":"Magin","sequence":"additional","affiliation":[{"name":"Anesthesiology, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-1896-2147","authenticated-orcid":false,"given":"Yuka","family":"Koyama","sequence":"additional","affiliation":[{"name":"Anesthesiology, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-8638-4862","authenticated-orcid":false,"given":"David Gaston","family":"Sanders","sequence":"additional","affiliation":[{"name":"Anesthesiology, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-6503-7468","authenticated-orcid":false,"given":"Minakshi","family":"Pillai","sequence":"additional","affiliation":[{"name":"Anesthesiology, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xinming","family":"An","sequence":"additional","affiliation":[{"name":"Anesthesiology, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stuart Alan","family":"Grant","sequence":"additional","affiliation":[{"name":"Anesthesiology, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexander S","family":"Doyal","sequence":"additional","affiliation":[{"name":"Anesthesiology, The University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2025,6,4]]},"reference":[{"key":"2026050502150670000_51.5.485.1","doi-asserted-by":"publisher","DOI":"10.1093\/bja\/aer058"},{"key":"2026050502150670000_51.5.485.2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2044.2008.05792.x"},{"key":"2026050502150670000_51.5.485.3","doi-asserted-by":"publisher","DOI":"10.1213\/ANE.0b013e318274fc19"},{"key":"2026050502150670000_51.5.485.4","doi-asserted-by":"publisher","DOI":"10.1111\/j.1399-6576.1991.tb03354.x"},{"key":"2026050502150670000_51.5.485.5","doi-asserted-by":"publisher","DOI":"10.1093\/bja\/70.1.6"},{"key":"2026050502150670000_51.5.485.6","doi-asserted-by":"publisher","DOI":"10.1097\/00000539-199801000-00030"},{"key":"2026050502150670000_51.5.485.7","doi-asserted-by":"publisher","DOI":"10.1097\/00000539-200111000-00063"},{"key":"2026050502150670000_51.5.485.8","doi-asserted-by":"crossref","first-page":"89","DOI":"10.1213\/ANE.0000000000003372","article-title":"Diagnostic 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Part II: The morphology of changes","volume":"13","author":"Smereczy\u0144ski","year":"2013","journal-title":"J Ultrason"}],"container-title":["Regional Anesthesia &amp; Pain Medicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/rapm-2025-106570","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T09:15:41Z","timestamp":1777972541000},"score":1,"resource":{"primary":{"URL":"https:\/\/rapm.bmj.com\/lookup\/doi\/10.1136\/rapm-2025-106570"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,6,4]]},"references-count":24,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2026,5,5]]},"published-print":{"date-parts":[[2026,5]]}},"alternative-id":["10.1136\/rapm-2025-106570"],"URL":"https:\/\/doi.org\/10.1136\/rapm-2025-106570","relation":{},"ISSN":["1098-7339","1532-8651"],"issn-type":[{"value":"1098-7339","type":"print"},{"value":"1532-8651","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,6,4]]}}}