Table 2:

Characteristics of group A studies

Reference	Year	Pro/Ret	Level of Evidence	No. of Patients	Time to Initial MRI	Time to Follow-Up Imaging	% of Patients Receiving Thrombolysis
Delgado-Mederos et al30	2007	Ret	4	113	6 hours	36–48 hours	100
Rivers et al29	2006	Pro	3b	46	<24 hours	1 or 3 months	0
Seitz et al28	2005	Pro	2b	64	<3 hours	8 days	45
Ritzl et al27	2004	Pro	2b	12	<24 hours	124 days	58
Schramm et al26	2004	Pro	3b	22	<6 hours	5 days*	59
Schaefer et al25	2004	Ret	4	16	<6 hours	1–7 days	100
Fiehler et al24	2004	Pro	3b	68	<6 hours	4–7 days	40
Shih et al23	2003	Pro	3b	14	<6 hours	7 days	100
Schramm et al22	2002	Pro	2b	20	<6 hours	5 days	40
Parsons et al21	2002	Pro	3b	40	<6 hours	81 days	48
Schellinger et al20	2001	Pro	3b	41	<6 hours	2–5 days	56
Kidwell et al18	2000	Pro	3b	7	<6 hours	7 days	100
Parsons et al19	2000	Pro	2b	19	<24 hours	30–90 days	Not specified
Beaulieu et al15	1999	Pro	3b	21	<7 hours	30 days	60
Neumann-Haefelin et al17	1999	Pro	2b	20	<24 hours	6–14 days	20
Sorensen et al16	1999	Ret	4	23	<12 hours	3–59 days	0
Barber et al31	1998	Pro	3b	18	<24 hours	7–120 days	6
Tong et al14	1998	Ret	4	8	<6.5 hours	7 days	20

Note:—MRI indicates MR imaging; Ret, retrospective; Pro, prospective.

^*Follow up imaging performed with CT.