Introduction To evaluate the number of patients that achieved loss of at least 10% of their excess body weight prior to undergoing laparoscopic gastric bypass or gastric band surgery.
Methods Forty consecutive patients (mean age 48.28 (SD 10.52); 36 females) that underwent laparoscopic gastric bypass or gastric band surgery between May and November 2011 by one surgeon (EE) were included in the study. Patients were identified using the hospital's prospective bariatric database. Inclusion criteria included: age over 18, primary bariatric surgery, Body Mass Index (BMI) over 35. SPSS statistical software was used for the analysis.
Results Fifty-two patients were identified using the database, of which forty fulfilled the inclusion criteria. The mean BMI was 46.67 (SD 5.13) at presentation and 43.15 (SD 4.31) at surgery. Thirty-six patients lost weight pre-operatively, of which twenty-nine achieved their target weight loss. The overall mean % excess weight loss was 17.81% (SD 8.04); of those who achieved the target weight loss, the mean excess body weight loss was 20.27% (SD 6.90). The mean time interval between decision to operate and date of surgery was 28 weeks (SD 14.52). This was not shown to significantly influence the outcome. Hypertension was present in 18 patients; 10 patients had type 2 diabetes (T2DM), 10 obstructive sleep apnoea (OSA), seven asthma, five hypothyroidism and two chronic obstructive pulmonary disease. The absence of OSA was associated with successful target weight loss. This did not reach statistical significance (24 patients without OSA achieved their target excess body weight loss; p=0.079).
Conclusion The majority of patients in the present study achieved the target weight loss quoted in the literature. The presence of OSA appears to negatively influence the achievement of pre-operative excess body weight loss.
Competing interests None declared.