Nationwide use and outcomes of ambulatory surgery in morbidly obese patients in the United States

Study Objective: To compare the overall characteristics and perioperative outcomes in morbidly obese and nonobese patients undergoing ambulatory surgery in the United States. Design: Retrospective, propensity-matched cohort study. Setting: Academic medical center. Measurements: The association between duration of surgical procedures, postoperative complications, and unplanned hospital admission was assessed in a propensity-matched cohort of morbidly obese and nonobese patients derived from the 2006 National Survey of Ambulatory Surgery. Main Results: Only 0.32% of the ambulatory procedures were performed on morbidly obese patients. The morbidly obese were significantly younger but had a higher burden of comorbidities, were more likely to undergo the procedure in hospital-based outpatient departments (HOPD; 80.1% vs 56.5%; P=0.004), and had significantly shorter procedures than the nonobese (median [interquartile range], 28 [21-38] vs 42 [22-65] min; P < 0.0001). The incidences of postoperative hypertension, hypotension, hypoxia, cancellation of surgery, and unplanned hospital admissions did not differ significantly between groups. Similarly, adjusted rates of delayed discharge were similar in morbidly obese and nonobese patients (odds ratio [OR], 0.46; 95% confidence interval [CI], 0.18 - 1.15; P = 0.09). In contrast, morbid obesity was associated with decreased odds of postoperative nausea and vomiting (OR, 0.27; CI, 0.09 - 0.84; P = 0.01). Conclusions: In 2006 in the U.S., the prevalence of ambulatory surgery in the morbidly obese was low, with most of the procedures being performed in the HOPD facilities, suggesting a conservative patient selection. The incidence of adverse postoperative outcomes and delayed discharge, as well as unplanned hospital admission after ambulatory surgery in the morbidly obese, was similar to that reported in the nonobese. (C) 2014 Elsevier Inc. All rights reserved.