D13. Ratio of Resected Tissue Mass to Pre-operative Weight Loss as a Predictor for Post-operative Complications in Abdominal Contouring Procedures after Massive Weight Loss

PURPOSE: The demand for abdominal contouring surgeries after weight loss is increasing. This study seeks to investigate the relationship between the ratio of resected tissue mass to pre-operative weight loss and complication rates in abdominal contouring surgeries for massive weight loss patients. METHODS: A retrospective analysis of patient who underwent abdominal contouring surgeries after massive weight loss over an eight-year period was conducted. Complications were categorized using the Clavien-Dindo classification system. Univariate and multivariate logistic regressions were performed to explore the association between the ratio of resected tissue mass to pre-operative weight loss and complication rates. RESULTS: 358 patients were included with a mean BMI of 30.41±5.37 kg/m². The average ratio of resected tissue mass to pre-operative weight loss was 5.06±2.71 percent which was associated with increased rates of seroma (odds ratio, 1.12; P=0.04), infection (odds ratio, 1.17; P<0.01), and Clavien-Dindo category 2-4 complications (odds ratio, 1.09; P=0.03). After controlling for age, tobacco use, rectus plication, diabetes, and combined surgeries, the ratio of resected tissue mass to pre-operative weight loss remained associated with increased Clavien-Dindo category 2-4 complications (odds ratio, 1.10; P=0.03). CONCLUSION: Higher ratio of resected pannus mass to pre-operative weight loss is associated with increased complications rates in abdominal contouring surgery in massive weight loss patients. This novel predictor may enhance the surgeon's ability to modify post-operative management to prevent such complications.