Abstract TMP78: Heterogeneous Imaging Practices Associated With Emergency Department Work-Up of Transient Ischemic Attack

Abstract

Introduction: Multiple societal guidelines recommend urgent imaging in patients with transient ischemic attack (TIA) to identify and treat risk factors that may lead to future stroke. Recommended studies include brain imaging, preferably with MRI, and neurovascular imaging (cranio-cervical CTA, cranio-cervical MRA or carotid ultrasound). The purpose of this study was to evaluate whether emergency department (ED) imaging utilization practices comply with recommended guidelines. Methods: Analysis utilized the Nationwide Emergency Department Sample (NEDS), a comprehensive, nationally representative sample of ED visits. Primary analysis was performed on the 2016 cohort, and a secondary trend analysis was performed on cohorts from 2006-2016. Patients diagnosed and discharged from the emergency department with transient ischemic attack were identified using ICD-9 and ICD-10 codes. Brain and neurovascular imaging obtained during the encounter were identified using CPT codes. Demographics, health insurance, patient income, and hospital type data were analyzed and a survey weighted logistic regression analysis was performed to identify predictors of obtaining neurovascular imaging. Results: In 2016 there were 183,216 patients evaluated and discharged from emergency departments with TIA. The percentage of patients receiving brain and neurovascular imaging was 75.73% and 37.99% respectively. Of the top 5 imaging work-ups utilized, the most common (34.06% of cases) was a solitary noncontrast head CT without any neurovascular imaging. Decreased odds of obtaining neurovascular imaging was observed in Medicaid patients (OR: 0.73, 95%CI: 0.66-0.80), non-trauma centers (OR: 0.42, 95%CI: 0.38-0.45), and rural hospital locations (OR: 0.30, 95%CI: 0.27-0.33). Trend analysis demonstrated a steady rise in brain and neurovascular imaging from 34.02% and 6.51% of encounters respectively in 2006 to 75.73% and 37.99% of encounters in 2016. Conclusion: The majority of TIA patients discharged from the ED do not receive recommended neurovascular imaging during their encounter. Follow-up studies are needed to determine whether delayed or incomplete vascular screening increases the risk of future stroke.