Psychosocial variables as predictors of Roux -en -Y gastric bypass procedure (RYGBP) outcomes
Morbid obesity is a prevalent and costly problem. Although bariatric surgery usually provides a higher degree of weight loss for patients than do more conventional nonsurgical methods, failure may carry significant consequences. Research designed to ascertain psychosocial variables that predict bariatric outcome have not yielded consistent results. Thus, presurgical psychiatric screening methods remain inconsistent. The present study was designed to evaluate psychometric test scores on selected measures (MMPI-2 and OQ) as predictors of postoperative Roux-en-Y gastric bypass procedure (RYGBP) outcome as measured by percentage of excess weight loss (EWL%) 1 year after RYGBP. The psychological test scores of 270 RYGBP patients were used in a retrospective analysis. Patients who scored higher on the MMPI-SS Hypomania (Ma) and the MMPI-RC Aberrant Experiences (RC8) lost less EWL% 12 to 24 months after surgery than did patients who scored lower on the two measures. Outcome was best predicted by RC8 alone. The MMPI-RC may provide better predictive utility than the MMPI-SS or OQ subscales. Future research should further examine the predictive utility of the MMPI-RC for RYGBP outcome, as it may ultimately prove a more reliable bariatric screening tool than the MMPI-SS. The RC8 may be useful in assessing behavioral constructs that could negatively impact EWL%, such as poor judgment and poor adherence to postsurgical guidelines.
0622: Clinical psychology