Mechanical thrombectomy (MT) is the preferred treatment for large vessel occlusion (LVO) ischemic stroke, and neurological outcome improves with earlier treatment. Patients with LVO frequently require inter-facility transfer to access MT but delays at transferring EDs may worsen neurological outcomes.

We conducted a retrospective observational study to evaluate the association of time spent and transferring EDs with 90-day neurological outcomes among patients who were transferred from an outside ED to the Comprehensive Stroke Center and received MT. Time intervals at transferring EDs were examined descriptively, and multivariable logistic regression modeling was used to examine the association of time spent in the ED with 90-day neurologic outcome (modified Rankin Scale; good ≤2, poor ≥3).

Among 111 patients transferred to a stroke center for MT between 2013 and 2017, the time between CT scan and the stroke center transfer request was 44 (IQR 27,65) minutes, or 47% of transferring ED total duration. Duration at the transferring ED was not significantly associated with 90-day outcome. Only NIH Stroke Scale at the time of arrival to the stroke center was associated with good 90-day neurological outcome (aOR 0.84, 95%CI 0.77, 0.92, p < 0.0001).

Among LVO patients transferred for MT, the total time spent at transferring EDs was not associated with 90-day neurologic outcome in patients with LVO. As therapies and their associated effectiveness improves over time, future investigations should further characterize the time between CT and transfer request to identify targets for process improvement and clinical outcomes.