Table 1.

Changes in extra cellular evoked potentials(mean ± SD, n = 8)

Group	OPS disappearing time (min)	OPS recovery degree (%)	OPS recovery rate (%)
OGD	2.9 ± 0.7	9.5%± 19.2	0%(0/8)
2%Sev	3.9 ± 0.9**	31.2%± 29.8	12.5%(1/8)
4%Sev	4.8 ± 1.5**	58.9%± 17.1**	62.5%(5/8)*
6%Sev	5.0 ± 1.1**	67.9%± 21.8**,#	62.5%(5/8)*

*P < 0.05, **P < 0.01 vs. OGD group; ^# P < 0.01 vs. 2% Sev group.