title: Changes in Gastric Volume and Their Implications for Weight Loss after Laparoscopic Sleeve Gastrectomy.
abstract: Laparoscopic sleeve gastrectomy (LSG) is a relatively new surgical technique for the treatment of morbid obesity. It is unclear whether the volume of the gastric remnant can expand after surgery as a result of intraluminal pressure maintained over time. If this were the case, the increased volume could affect weight loss and the improvement in comorbidities. This study aims to assess the evolution of residual gastric volume (RGV) during the first year after LSG and its relationship with weight loss.
  
  
  
  We conducted a prospective study of 112 patients who underwent LSG from February 2009 to December 2013. In order to measure the RGV after surgery, all patients were evaluated radiologically by an esophagogastroduodenal (EGD) transit at 1 and 12 postoperative months.
  
  
  
  All patients showed a significant reduction in BMI compared with the preoperative measurement (33.48 ± 5.78 vs. 50.54 ± 6.69 kg/m2; p < 0.001). Increased RGV was observed when comparing the results obtained by EGD transit at 1 (68.39 ± 25.89 cm3) and 12 postoperative months (122.58 ± 38.76 cm3; p < 0.001). There was no association between increase in gastric volume and weight loss at 1-year follow-up (r = 0.01; p = 0.910).
  
  
  
  The volume of the gastric remnant increased significantly during the first year after LSG. However, this increase was not associated with weight loss. Further prospective research with longer follow-up periods is needed to confirm or contrast the present results.
authors.affiliation: Bariatric Surgery Department, Complejo Hospitalario Torrecárdenas, Almería, Spain. manuferrer78@hotmail.com.
authors.forename: Manuel
authors.initials: M
authors.lastname: Ferrer-Márquez
authors.affiliation: Torrecárdenas Hospital, Almería, Spain.
authors.forename: Juan José
authors.initials: JJ
authors.lastname: García-Díaz
authors.affiliation: Bariatric Surgery Department, Complejo Hospitalario Torrecárdenas, Almería, Spain.
authors.forename: Almudena
authors.initials: A
authors.lastname: Moreno-Serrano
authors.affiliation: Department of Radiology, Torrecárdenas Hospital, Almería, Spain.
authors.forename: José Miguel
authors.initials: JM
authors.lastname: García-Díez
authors.affiliation: Bariatric Surgery Department, Complejo Hospitalario Torrecárdenas, Almería, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Ferrer-Ayza
authors.affiliation: Medical area, University of Almería, Almería, Spain.
authors.forename: Raquel
authors.initials: R
authors.lastname: Alarcón-Rodríguez
authors.affiliation: Department of Education, Area of Physical Education and Sport, University of Almería, Almería, Spain.
authors.forename: Enrique G
authors.initials: EG
authors.lastname: Artero
authors.affiliation: Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Soriano-Maldonado
mesh_terms: D000328:Adult; D015992:Body Mass Index; D005260:Female; D005500:Follow-Up Studies; D005743:Gastrectomy / Q000379:methods*; D018530:Gastric Stump / Q000473:pathology*; D006801:Humans; D010535:Laparoscopy / Q000379:methods; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000473:pathology / Q000601:surgery*; D009929:Organ Size; D011184:Postoperative Period; D015431:Weight Loss / Q000502:physiology*; D055815:Young Adult
keywords: Esophagogastroduodenal transit; Gastric volume; Laparoscopic sleeve gastrectomy; Obesity; Weight loss