Comparisons of the maximum level of sensory blockade (upper level and lower level of the blocked dermatomes) between the E-isoflurane group and the Lidocaine group. The drug administered is emulsified isoflurane 8%, 1 ml in the E-isoflurane group or lidocaine 1%, 1 ml in the Lidocaine group. Each testing site is rated as follows: hand, +3; chest, +2; epigastrium, +1; knee, −1; foot, −2. Level ‘0’ means that the sensory blockade level cannot be detected. Values are mean (sd) (n=10). There is no significant difference in either upper level or lower level between the two groups (P>0.05).