LAUSR

INTRODUCTION Mental illness is associated with worse outcomes after emergency general surgery. To understand how pre-operative processes of care may influence disparate outcomes, we examined rates of surgical consultation, treatment, and operative approach between older adults with and without serious mental illness (SMI). METHODS We performed a nationwide, retrospective cohort study of Medicare beneficiaries aged ≥65.5 years hospitalized via the emergency department for acute cholecystitis or biliary colic. SMI was defined as schizophrenia-spectrum, mood, and/or anxiety disorders. The primary outcome was surgical consultation. Secondary outcomes included operative treatment and surgical approach (laparoscopic versus open). Multivariable logistic regression was used to examine outcomes with adjustment for potential confounders related to patient demographics, co-morbidities, and rates of imaging. RESULTS Of 85,943 included older adults, 19,549 (22.7%) had SMI. Prior to adjustment, patients with SMI had lower rates of surgical consultation (78.6% vs. 80.2%, p<0.001) and operative treatment (68.2% vs. 71.7%, p<0.001), but no significant difference regarding laparoscopic approach (92.0% vs. 92.1%, p=0.805). In multivariable regression models with adjustment for confounders, there was no difference in odds of receiving a surgical consultation [OR 0.98 (95% CI 0.93-1.03)] or undergoing operative treatment [OR 0.98 (95% CI 0.93-1.03)] for patients with SMI compared to those without SMI. CONCLUSIONS Older adults with SMI had similar odds of receiving surgical consultation and operative treatment as those without SMI. As such, differences in processes of care that result in SMI-related disparities likely occur before or after the point of surgical consultation in this universally insured patient population.