At baseline CT angiography , proximal occlusions ( n = 220 ) demonstrated no difference in primary outcome ( 41.3 % [ 62 of 150 ] endovascular vs 38 % [ 27 of 70 ] intravenous [ IV ] tissue-plasminogen activator [ tPA ] ; relative risk , 1.07 [ 99 % confidence interval : 0.67 , 1.70 ] ; P = .70 ) ; however , 24-hour recanalization rate was higher for endovascular treatment ( n = 167 ; 84.3 % [ 97 of 115 ] endovascular vs 56 % [ 29 of 52 ] IV tPA ; P < .001 ) .