Introduction Patients considered for laparoscopic adjustable gastric banding (LAGB) are encouraged to lose weight pre-operatively, based on the hypothesis that good pre-operative dietary weight loss correlates with a favourable post-operative outcome and allows safe surgery. This study aims to assess whether pre-operative weight loss is a true predictor of post-operative weight loss in patients who underwent LAGB for morbid obesity.
Methods A retrospective analysis of patients who underwent LAGB in 2007 at our institution by a single surgeon, using actual body weight loss pre-operatively (from patient's BMI at the bariatric surgical clinic vs their BMI on the pre-operative day) and then comparing this to their BMI at 1 and 2 years post-operatively.
Results 69 patients were included in the study (M=23, F=46, M:F=1:2), with a mean age of 45.7 years (Range 19–64). The average BMI at the bariatric surgical clinic was 54.01 (Range = 38–72). The average BMI on the pre-operative day was 52.13 (Range 33–70), which reflected in a mean reduction in BMI of 1.88 (or 4.86 kg) (Range −5–19) or a mean excess percent BMI loss (EBL) of 7.4 kg/m2. An analysis of their 1- and 2-year post-operative weight loss compared to their weights from clinic was then performed. At 1 year post-operatively, the mean reduction in BMI was 11.1 (Range = −5–27) or an EBL of 33.6 kg/m2. At 2 years post-operatively, the mean reduction in BMI was 13.29 (Range = −1–35) or an EBL of 41.5 kg/m2. Correlation between pre-operative weight loss vs weight lost at 1 and 2 years post LAGB was performed using the Spearman Rank Correlation, as the data were not normally distributed. At 1 year post-operatively, the Spearman Rank Correlation was 0.154 (95% CI −0.094 to 0.383) with a p value of 0.208 (no statistical significant correlation). At 2 years post-operatively, the Spearman Rank Correlation was 0.069 (95% CI −0.177 to 0.307) with a p value of 0.573 (no statistical significant correlation). Scatter plot graphs of individual pre-operative weight loss data vs year 1 and year 2 weight loss data confirmed there was no linear correlation.
Conclusion Pre-operative dietary weight loss does not correlate with better outcomes following laparoscopic adjustable gastric banding.
Competing interests None declared.
Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.