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This retrospective study assesses how RGV relates to changes in body weight and BMI at 6 and 12 months, using specimen-based ellipsoid calculations and repeated-measures statistical methods. Results show time-dependent reductions in weight and BMI, with RGV correlating with preoperative weight but not predicting postoperative outcomes.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/effect-of-resected-gastric-volume-on-weight-loss-after-sleeve-gastrectomy-a-retrospective-clinical-study/406506/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/effect-of-resected-gastric-volume-on-weight-loss-after-sleeve-gastrectomy-a-retrospective-clinical-study/406506.png","ImageObject",300,407,{"name":92,"@type":93},"McQueen","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-01","2026-09-28",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",12,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What does the study evaluate regarding sleeve gastrectomy outcomes?","Question",{"text":113,"@type":114},"The study evaluates the effect of resected gastric volume (RGV) on postoperative weight loss and BMI changes in patients undergoing sleeve gastrectomy.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How many patients were included and what endpoints were measured?",{"text":118,"@type":114},"The retrospective study included 49 patients, recording preoperative and postoperative body weight and BMI at 6 months and 12 months after surgery.",{"name":120,"@type":111,"acceptedAnswer":121},"Does RGV predict postoperative weight loss after sleeve gastrectomy?",{"text":122,"@type":114},"RGV correlated with preoperative body weight, but it showed no significant association with weight or BMI at 6 months and 12 months, so it did not predict postoperative outcomes.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},406506,1790845659,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":39,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":46,"preview_page_count":4},5909890329169,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","| W | J | G | S | World Journal of\u003Cbr>Gastrointestinal Surgery |\n| --- | --- | --- | --- | --- |\n\nSubmit a Manuscript: [https://www.f6publishing.com](https://www.f6publishing.com) World J Gastrointest Surg 2025 December 27; 17(12): 113571  \nDOI: 10.4240/wjgs.v17.i12.113571 ISSN 1948-9366 (online)  \nORIGINAL ARTICLE  \nRetrospective Study  \nEffect of resected gastric volume on weight loss after sleeve gastrectomy: A retrospective clinical study  \nBahadır Öndeş, Osman G Gökdere, Burhan H Kanat  \nSpecialty type: Gastroenterology and hepatology  \nProvenance and peer review:  \nInvited article; Externally peer reviewed.  \nPeer-review model: Single blind  \nPeer-review report’s classification Scientific Quality: Grade A, Grade B  \nNovelty: Grade B, Grade B  \nCreativity or Innovation: Grade B, Grade B  \nScientific Significance: Grade A, Grade A  \nP-Reviewer: Dogan L, Professor, Türkiye; Gulcelik MA, Dean, Head, Professor, Türkiye  \nReceived: September 8, 2025  \nRevised: September 19, 2025  \nAccepted: November 4, 2025  \nPublished online: December 27, 2025  \nProcessing time: 108 Days and 22.5 Hours  \nBahadır Öndeş, Osman G Gökdere, Burhan H Kanat, Department of General Surgery, Malatya Turgut Özal University, Malatya 44090, Türkiye  \nCorresponding author: Bahadır Öndeş, MD, Assistant Professor, Department of General Surgery, Malatya Turgut Özal University, Özalper Mahallesi Malatya Eğitim Araştırma Hastanesi, Malatya 44090, Tü[rkiye.](rkiye. bahadir.ondes@ozal.edu.tr)[ bahadir.ondes@ozal.edu.tr](rkiye. bahadir.ondes@ozal.edu.tr)  \nAbstract  \nBACKGROUND  \nObesity is a major global health concern associated with increased morbidity and mortality. Sleeve gastrectomy is an effective bariatric surgery; however, the impact of resected gastric volume (RGV) on postoperative weight loss remains controversial.  \nAIM  \nTo evaluate the effect of RGV on weight loss and body mass index (BMI) changes in patients undergoing sleeve gastrectomy.  \nMETHODS  \nThis retrospective study included 49 patients. Preoperative and postoperative body weight and BMI (at 6 months and 12 months after surgery) were recorded. RGV was calculated using the ellipsoid formula based on the specimen’s length, width, and thickness measurements. Statistical analyses included parametric tests, repeated-measures one-way analysis of variance, Bonferroni post-hoc tests, and Pearson correlation analysis.  \nRESULTS  \nBoth body weight and BMI significantly decreased over time (weight: F = 951.34, P \u003C 0.01, η2 = 0.95; BMI: F = 345.97, P \u003C 0.01, η2 = 0.88) . A positive and statistically significant correlation was found between preoperative body weight and RGV (r = 0.285, P \u003C 0.05) . However, no significant associations were identified between RGV and weight or BMI at 6 months and 12 months.  \nCONCLUSION  \nRGV correlated with preoperative weight but not with postoperative outcomes, indicating that weight loss after sleeve gastrectomy is a multifactorial process and influenced by hormonal, metabolic, and lifestyle factors.  \n WJGS  [https://www.wjgnet.com](https://www.wjgnet.com) 1 December 27, 2025  Volume 17  Issue 12   \nÖndeş B et al. Gastric volume/weight loss post-sleeve gastrectomy  \nKey Words: Bariatric surgery; Gastrectomy; Weight reduction programs; Body mass index; Obesity; Morbid; Treatment outcome  \n©The Author(s) 2025. Published by Baishideng Publishing Group Inc. All rights reserved.  \nCore Tip: This study investigated the effect of resected gastric volume on weight loss after sleeve gastrectomy. The findings revealed that although resected gastric volume correlated with preoperative body weight, it did not predict postoperative weight loss, supporting the concept that weight reduction after sleeve gastrectomy is influenced by multifactorial mechanisms beyond gastric volume alone.  \nCitation: Öndeş B, Gökdere OG, Kanat BH. Effect of resected gastric volume on weight loss after sleeve gastrectomy: A retrospective clinical study. World J Gastrointest Surg 2025; 17(12): 113571  \n","cbCaipQWee1Z2kLg","https://ap.wps.com/l/cbCaipQWee1Z2kLg","pdf",516593,"English","# Abstract\n## Background\n## Aim\n## Methods\n## Results\n## Conclusion\n# Introduction\n## Global obesity trends\n## Sleeve gastrectomy and mechanisms of weight loss\n## Conflicting evidence on resected gastric volume","[{\"question\":\"What does the study evaluate regarding sleeve gastrectomy outcomes?\",\"answer\":\"The study evaluates the effect of resected gastric volume (RGV) on postoperative weight loss and BMI changes in patients undergoing sleeve gastrectomy.\"},{\"question\":\"How many patients were included and what endpoints were measured?\",\"answer\":\"The retrospective study included 49 patients, recording preoperative and postoperative body weight and BMI at 6 months and 12 months after surgery.\"},{\"question\":\"Does RGV predict postoperative weight loss after sleeve gastrectomy?\",\"answer\":\"RGV correlated with preoperative body weight, but it showed no significant association with weight or BMI at 6 months and 12 months, so it did not predict postoperative outcomes.\"}]","Effect of resected gastric volume on weight loss after sleeve gastrectomy - A retrospective clinical study | PDF",1790566148]