Table 1. Occluded site and administration of intravenous rt-PA.

	ICA (n = 77)	M1 (n = 126)		P value
		Proximal M1 (n = 36)	Distal M1 (n = 90)
Initial noninvasive vascular imaging				0.2
CTA (n = 23)	12	2	9
MRA (n = 180)	65	34	81
IV rt-PA				0.6
Yes (n = 103)	36	18	49
No (n = 100)	41	18	41

ICA: internal carotid artery, IV: intravenous, M1: M1 segment of middle cerebral artery, rt-PA: recombinant tissue plasminogen activator.