Door-in-Door-Out Times at Referring Hospitals and Outcomes of Hemorrhagic Stroke.

Study objective: Interhospital transfer is often required in the care of patients with hemorrhagic stroke. Guidelines recommend a door-in-door-out (DIDO) time of ≤120 minutes at the transferring emergency department (ED); however, it is unknown whether DIDO times are related to clinical outcomes of hemorrhagic stroke.

Methods: Retrospective, observational cohort study using US registry data from Get With The Guidelines-Stroke participating hospitals. Patients include those aged ≥18 years with intracerebral hemorrhage (ICH) or subarachnoid hemorrhage (SAH) who were transferred from the ED to a Get With The Guidelines participating receiving hospital from January 1, 2019, to July 31, 2022. The primary outcome was ordinal discharge modified Rankin scale (mRS) score and secondary outcomes included dichotomous discharge mRS, ability to ambulate independently at discharge, and inhospital mortality at the receiving hospital.

Results: In all, 19,708 ICH and 7,757 patients with SAH were included. For patients with ICH, an increasing DIDO time was associated with greater odds of mRS 0 to 3 versus 4 to 6 at discharge in the unadjusted analyses (DIDO 91 to 180 minutes, odds ratio [OR] 1.15 [1.04 to 1.27]; DIDO 181 to 270 minutes, OR 1.51 [1.33, 1.71]; DIDO >270 minutes, OR 1.83 [1.58, 2.11]; versus DIDO ≤90 minutes). In the adjusted analyses, no associations were observed. Similar results were seen for mRS at discharge in patients with SAH. In both patients with ICH and SAH, longer DIDO times were associated with greater odds of independent ambulation at discharge and lower odds of inhospital mortality in the unadjusted analyses. After adjustment, the effect sizes of these associations were reduced, with some of the results based on quartiles becoming statistically nonsignificant.

Conclusion: These findings suggest that EDs currently expedite the transfer of the sickest patients; however, prospective studies and more granular data are needed to understand the impact of early treatment and timing of transfer for patients with hemorrhagic stroke.