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Direct transfer to angio suite (DTAS) protocol is a promising measure to improve onset to recanalization time in patients who undergo endovascular treatment. The association of different time windows with prognosis in this population is influenced by several factors. We aim to analyze the influence of DTAS in clinical and functional outcome depending on time from symptom onset to treatment. Methods: Retrospective case-control study of 174 consecutive DTAS cases matched with 175 patients initially transferred to CT (DTCT) from February 2016 to April 2019. To obtain comparable groups on admission, cases and controls were matched by occlusion location, age (±2 years), baseline NIHSS score (±2 points) and time from symptoms onset to hospital arrival (±30 minutes). We analyzed the rate of good functional outcome at 3 months (mRS 0-2) and safety variables stratified in less or more than 3 hours from onset to arrive. Results: There were no significant differences regarding age, gender or baseline NIHSS score (table 1). Median door-to-groin time was shorter in the DTAS patients (16 (13-21) minutes Vs 70 (41.5-98.5); p<0.01). DTAS patients presented lower NIHSS score at 24 hours 9 (3.5-17) Vs 14 (5-19); p=0.01) and a lower rate of symptomatic hemorrhagic transformation (4.6% versus 10.9%, p<0.03). At 90 days, DTAS patients had a higher rate of good functional outcome (43% versus 29%; OR 1.81, 95% CI, 1.14-2.87; p=0.01). In multivariate analysis adjusted by confounding factors, better outcome in DTAS was observed in patients admitted in the 0-3 hours form onset window (n=156, OR 2.63, 95%CI: 1.31-5.28; p<0.01), but not in patients admitted in the 3-6 hours window (n=193, OR 1.37 955CI:0.72-2.60, p=0.2). Conclusion: DTAS seems a feasible and safe strategy to improve functional outcome in patients who undergo endovascular treatment mainly within 3 hours from symptoms onset.

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