New evidence-based A1, A2, A3 alarm time zones for transferring thrombolysed patients to hyper-acute stroke units: faster is better.
Thang Sieu HanGiosue GulliBrendan AffleyDavid FluckChristopher H FryChristopher BarrettPuneet KakarSapna SharmaPankaj SharmaPublished in: Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology (2019)
We propose three new alarm time zones (A1, A2 and A3) to improve stroke survival: "A1 Zone" (TArrival-HASU < 2 h/15 min) indicates that a desirable target, "A2 Zone" (TArrival-HASU = 2 h/15 min to 3 h/15 min), indicates increasing risk and should not delay any further, and "A3 Zone" (TArrival-HASU ≥ 3 h/15 min) indicates high risk and should be avoided.