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Time to (A) respiratory arrest and (B) apnea in the toxic and post-conditioning groups. Data are expressed as the mean ± standard deviation. (A) **P<0.01 vs. groups B and C (toxic subgroups); ##P<0.01 vs. groups B and C (post-conditioning subgroups). (B) **P<0.01 vs. group B (post-conditioning subgroup). Group B, lidocaine group; group C, levobupivacaine group; group D, ropivacaine group.
