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Abstract Details

Variation in Hospital-Level Use of Non-Invasive Vascular Imaging Among Stroke and Non-Stroke Patients
Cerebrovascular Disease and Interventional Neurology
P9 - Poster Session 9 (11:45 AM-12:45 PM)
14-006
This study aimed to assess the proportion of CTA performed among U.S. Medicare beneficiaries in both stroke and non-stroke cohorts and characterize its variation at the hospital-level.
Non-invasive imaging of carotid and intracranial vessels (referred to as "CTA") is used for diagnosis, targeting secondary prevention, and screening for large vessel occlusion in stroke patients. While CTA has clear utility, it also has potential downsides including radiation exposure, costs and incidental findings/false positives. 
We conducted a cross-sectional analysis using 2021 Medicare data. CTA was identified using CPT codes in a 5% Carrier file. Claims were linked to Inpatient and ED Outpatient data to obtain detailed clinical context for each visit. Patients were determined as stroke or non-stroke cohorts based on ICD-10-CM diagnosis codes during their CTA visit. We used multi-level linear regression models, clustered at hospital level and adjusted for transfer-in/transfer-out status, to estimate the "shrunken mean" of CTA rates among stroke and non-stroke patients for each hospital.
We identified 3090 hospitals in the study. Shrunken mean CTA rates for stroke patients varied substantially, from 24.6% to 86.3% with a median of 56.7% [IQR 50%-65.3%]. CTA use also varied for non-stroke patients, ranging from 1.7% to 18.1% with median of 4.4% [IQR 3.7-5.7]. Stroke and non-stroke imaging rates were correlated (correlation coefficient=0.4). However, there was significant variation, of the 1560 hospitals with above median CTA rates for stroke diagnoses, 37.3% had below median rates of CTA use for non-stroke diagnoses
CTA was widely used for both stroke and non-stroke patients but varied significantly at the hospital level. This variation may represent an opportunity to optimize CTA use. The existence of hospitals with relatively high CTA use in stroke patients and low use in non-stroke patients suggests it is possible to apply CTA selectively. 
Authors/Disclosures
Ran Bi, MS (The Ohio State University)
PRESENTER 		Miss Bi has nothing to disclose.
Chun Chieh Lin, PhD (The Ohio state University) The institution of Dr. Lin has received research support from AAN. The institution of Dr. Lin has received research support from Genentech Inc. The institution of Dr. Lin has received research support from NIH.
Kevin A. Kerber, MD (Ohio State University Department of Neurology) Dr. Kerber has received personal compensation in the range of $500-$4,999 for serving as a Consultant for 好色先生. The institution of Dr. Kerber has received research support from National Institutes of Health. The institution of Dr. Kerber has received research support from Genentech, Inc . Dr. Kerber has received publishing royalties from a publication relating to health care.
James F. Burke, MD (Ohio State Wexner Medical Center) Dr. Burke has received personal compensation in the range of $500-$4,999 for serving as an Editor, Associate Editor, or Editorial Advisory Board Member for American Heart Association/Circulation: Cardiovascular quality and outcomes. The institution of Dr. Burke has received research support from Genentech Foundation. The institution of Dr. Burke has received research support from NIH.