Utility of Emergent Spine MRI in the Emergency Department.

Introduction: Prolonged emergency department (ED) waiting times for STAT spine magnetic resonance imaging (MRI) in the ED can expose patients to hospital-acquired infections and increase the workload in the ED, further impacting healthcare quality. In this study we aimed to characterize emergent spine MRI frequency and positivity in the ED, and its impact on ED length of stay (LOS), admission rates, and the necessity for surgical interventions.

Methods: We performed a retrospective chart review of a consecutive group of patients who had emergent spine MRI (cervical, thoracic, lumbar) ordered from the EDs at four hospitals from January 1, 2017-December 31,2022 were included for traumatic and atraumatic patients. We recorded patient demographics, time metrics, discharge status, and surgical interventions within seven days (for those who were hospitalized during the ED encounter). Spine MRI reports were reviewed and categorized, with positive cases defined as severe spinal canal stenosis regardless of cause and/or fracture. We used descriptive statistics to assess the positivity rate for emergent spine MRIs as well as the LOS, rate of surgery, and rate of admission for patients getting emergent spine MRIs.

Results: A total of 689 spine MRI of 889,527 ED visits (0.1%) were included. Patients' mean age was 51.3 ±17.1 years, and 59.5% were female. Discharge rate was 93.9%, 3.3% were admitted, 1.7% left against medical advice, and 1.0% were transferred to other facilities. The overall spine MRI positivity rate was 18.9% (130). Moreover, the median (IQR) time from imaging order placement to imaging completion was 2.6 (1.8 - 3.7) hours, while the time from imaging completion to final report availability was 1.5 (0.4 - 13.9) hours. The median ED LOS was 7.4 (5.7 - 9.5) hours. Of 23 hospitalized patients, 17 (73.9%) required surgical intervention. Positive cases had significantly higher ED LOS compared to negative cases (8.1 vs 7.2, respectively; P < .001).

Conclusion: The positivity rate for ED spine MRI in this study was 18.9%. Of the positive cases, 17.7% underwent hospitalization, with 13.1% requiring emergent surgery. Considering high costs in both time and resource utilization, further research is needed to optimize the triage process for patients requiring emergent spine MRI.