Abstract
Background: Early thrombolysis for acute ischemic stroke (AIS) due to emergent large vessel occlusion (ELVO) is associated with better clinical outcome. This is thought to be due to greater tissue salvage with earlier recanalization. We explored whether ultra-early administration of intravenous tissue plasminogen activator (IV tPA) within 60 min (Golden Hour) of symptom onset for AIS due to ELVO is associated with a higher rate of recanalization. Methods: We performed a retrospective analysis of recanalization rates and clinical outcomes in patients with AIS due to ELVO treated with IV tPA, comparing patients who received IV tPA within 60 min of stroke symptom onset with those treated beyond 60 min. Results: Between January 2013 and December 2016, 158 patients with AIS due to ELVO were treated with IV tPA. Of these, 25 (15.8%) patients received IV tPA within 60 min of stroke symptom onset, while the remaining 133 (84.2%) patients received IV tPA beyond 60 min. The ultra-early treatment group was found to have a higher rate of complete recanalization (28.0% vs 6.8%, 95% CI 1.78-16.63), better chance of early neurological improvement (76.0% vs 50.4%, 95% CI 1.16-8.65), favorable clinical outcomes (mRS <= 2 or return to premorbid mRS) (65.0% vs 36.8%, 95% CI 1.42-9.34), and lower mortality (5% vs 31.1%, 95% CI 0.01-0.74) at 90-day follow-up compared to the later treatment group. Conclusion: Our data suggest that ultra-early administration of IV tPA significantly improves recanalization rates and clinical outcomes in patients with AIS due to ELVO.