Demographic Predictors of Treatment and Complications for Spinal Disorders: Part 2, Lumbar Spine Trauma

Objective: To study the impact of demographic factors on management of traumatic injury to the lumbar spine and postoperative complication rates.Methods: Data was obtained from the National Inpatient Sample (NIS) between 2010–2014. International Classification of Diseases, 9th revision, Clinical Modification codes identified patients diagnosed with lumbar fractures or dislocations due to trauma. A series of multivariate regression models determined whether demographic variables predicted rates of complication and revision surgery.Results: A total of 38,249 patients were identified. Female patients were less likely to receive surgery and to receive a fusion when undergoing surgery, had higher complication rates, and more likely to undergo revision surgery. Medicare and Medicaid patients were less likely to receive surgical management for lumbar spine trauma and less likely to receive a fusion when operated on. Additionally, we found significant differences in surgical management and postoperative complication rates based on race, insurance type, hospital teaching status, and geography.Conclusion: Substantial differences in the surgical management of traumatic injury to the lumbar spine, including postoperative complications, among individuals of demographic factors such as age, sex, race, primary insurance, hospital teaching status, and geographic region suggest the need for further studies to understand how patient demographics influence management and complications for traumatic injury to the lumbar spine.

Abstract 9152: Incidence of Cardiac Arrest Among Medicare Beneficiaries

Introduction: Although survival for in-hospital cardiac arrest (IHCA) has improved substantially over the last two decades, survival rates have plateaued in recent years. Our understanding of incidence of IHCA remains limited. We measured incidence of IHCA among Medicare beneficiaries and evaluated hospital variation in incidence of IHCA. Methods: We used an observational cohort study using data from 2014-2017 Get with the Guidelines-Resuscitation (GWTG-R) data linked with Medicare inpatient data summarized by hospital. Hospital incidence of IHCA among Medicare beneficiaries was calculated as the total number of patients 65 years and older with an IHCA divided by the total number of Medicare admissions. Multivariable hierarchical regression models were used to adjust hospital incidence rates for differences in case-mix across study hospitals and evaluate its the association with hospital variables. Results: Among a total of 4.5 million admissions at 170 hospitals, 38,630 patients experienced an IHCA. The median risk-adjusted IHCA incidence was 8.3 per-1000 admissions. Even after adjusting for differences in case-mix index, IHCA incidence varied markedly across hospitals (Figure 1) ranging from 2.1 per-1000 admissions to 24.7 per-1000 admissions (interquartile range: 6.5-11.4; median odds ratio: 1.52; 95% credible interval 1.45-1.59). Among hospital variables, a higher case-mix index, higher nurse staffing and teaching status were associated with a lower hospital incidence of IHCA. Conclusions: Incidence of IHCA varies markedly across hospitals, even after adjustment for differences in patient case-mix. Hospital variables including case-mix severity, nurse staffing and teaching status were significantly associated with incidence rates. Future studies are needed to better understand processes of care at hospitals with exceptionally low IHCA incidence to identify best practices for cardiac arrest prevention.