Correlation of Gastric Volume and Weight Loss 5 Years Following Sleeve Gastrectomy.
INTRODUCTION
The volume of the gastric reservoir (VGR) after sleeve gastrectomy influences weight loss in the short-term, but long-term results are scarce. The aim was to analyze the correlation between the VGR and weight loss at 5 years of follow-up.


METHODS
It is a prospective observational study of 50 patients undergoing sleeve gastrectomy (SG) from February 2009 to December 2013. An upper gastrointestinal series was performed at 1 month and at 1 and 5 years after surgery. A composite formula was used for VGR estimation. Weight loss-related data included the following: body mass index (BMI), percentage of excess weight loss (%EWL), and percentage of excess BMI loss (%EBMIL) at 1 month and at 1 and 5 years. Uni- and multivariate analyses were carried out to determine other factors that might influence long-term weight loss results.


RESULTS
The %EWL at 1 year was 74.5(63.8-86) vs. 55.5(47-74.3) at 5 years (p < 0.001). The VGR 1 month after surgery was 114.9 (90.5-168.3) mL. The VGR increased from 216.7 (155.1-278.6) to 367.5 (273-560.3) mL (p < 0.001) at 1 and 5 years. Although a significant inverse correlation was observed between VGR and BMI, %EWL, and %EBMIL at 1 year, it disappeared at 5 years. In the multivariate analysis, the main factor to predict worse weight results at 5 years was a pre-surgical BMI ≥ 50 kg/m2.


CONCLUSION
The VGR increased progressively during the study period. Although an inverse relationship between VGR and weight was found at 1 year, this correlation did not remain at 5 years. A preoperative BMI ≥ 50 kg/m2 is the main predictive factor of poor weight outcomes.
['Pañella|Clara|C|http://orcid.org/0000-0002-4496-9521', 'Busto|Marcos|M|', 'González|Alba|A|', 'Serra|Carme|C|', 'Goday|Alberto|A|', 'Grande|Luís|L|', 'Pera|Manuel|M|', 'Ramón|José M|JM|']
D015992:Body Mass Index D005500:Follow-Up Studies D005743:Gastrectomy D006801:Humans D010535:Laparoscopy D009767:Obesity, Morbid D012189:Retrospective Studies D013270:Stomach D016896:Treatment Outcome D015431:Weight Loss
gastric volume Sleeve gastrectomy Excess weight loss long-term results.