Wednesday, September 26, 2018 7:35 AM–9:00 AM ePosters

Abstract

BACKGROUND CONTEXT American Society of Anesthesiologists Score (ASA) has previously been associated with complication rates and costs after spinal surgery. To the authors’ knowledge, no studies have examined the association between ASA Score and in-patient pain and narcotics utilization after minimally invasive transforaminal lumbar interbody fusion (MIS TLIF). PURPOSE To determine the association between ASA score and in-patient pain and narcotics consumption in patients undergoing MIS TLIF. STUDY DESIGN/SETTING Retrospective analysis of a prospectively maintained surgical database. PATIENT SAMPLE A total of 355 patients who underwent a single-level, primary MIS TLIF between 2012 and 2017. OUTCOME MEASURES Narcotic consumption as oral morphine equivalents (OMEs) and inpatient Visual Analogue Scale (VAS) pain scores. METHODS A prospectively maintained surgical database of patients who underwent a single-level, primary MIS TLIF for degenerative pathology between 2012 and 2017 was reviewed. Patients were stratified by ASA Score (1, 2 and 3). ASA score was tested for association with demographics using ANOVA and chi-squared analysis for continuous and categorical variables, respectively. In-patient pain scores and narcotics consumption on each postoperative day were then compared between cohorts using ANOVA. RESULTS Of 355 patients, 38 had an ASA score of 1, 256 had an ASA score of 2, and 61 had an ASA score 3. Higher ASA score patients were older, more likely to be obese, and had greater comorbidity burdens (p .05 for each). CONCLUSIONS The results of this study suggest that higher ASA score is associated with older age, obesity and greater comorbidity burden in MIS TLIF patients. Despite this, there were no differences in inpatient pain or narcotics consumption based on ASA score. As such, ASA score may not be predictive of inpatient pain or narcotics utilization after MIS TLIF.