RT Journal Article SR Electronic T1 Odds of favourable 3-month outcome following ischaemic stroke are greatest when treatment with intravenous alteplase is initiated up to 90 min following event, with no benefit seen if alteplase is given after 270 min JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 22 OP 23 DO 10.1136/ebm1142 VO 16 IS 1 A1 Richard I Lindley YR 2011 UL http://ebm.bmj.com/content/16/1/22.abstract AB