Ruchit Patel ¹ Lilin Tong ^1,2 Bradley J. Molyneaux ¹ Nirav Patel ¹ Mohammed A. Aziz-Sultan ¹ Amar Dhand ¹ Wenya Linda Bi ^1*

• ¹ Brigham and Women's Hospital, Harvard Medical School, Boston, United States
• ² Chobanian & Avedisian School of Medicine, Boston University, Boston, Massachusetts, United States

Intracranial hemorrhages present across a spectrum of clinical phenotypes, with many patients transferred across hospitals to access higher levels of neurocritical care. We sought to characterize patient dispositions following intracranial hemorrhage and examine disparities associated with interhospital transfers. Using the Healthcare Cost and Utilization Project database, we mapped and identified factors influencing the likelihood of patient transfers and receipt of specialist interventional procedures following intracranial hemorrhage. Of 11,660 patients with intracranial hemorrhage, 59.4% had non-traumatic and 87.5% single compartment bleeds. After presentation, about a quarter of patients were transferred to another facility either directly from the ED (23.0%) or after inpatient admission (1.8%). On unadjusted analysis, patients who were white, in the upper income quartiles, with private insurance, or resided in suburban areas were more frequently transferred. After adjusting for patient-and hospital-level variables, younger and non-white patients had higher odds of transfer. Hospital capabilities, residence location, insurance status, and prior therapeutic relationship remained as transfer predictors. Transferred patients had a similar hospital length of stay compared to admitted patients, with 43.1% having no recorded surgical or specialist interventional procedure after transfer. Our analysis demonstrates a significant role of interhospital transfers as well as structural challenges likely impacting transfer decisions.