Table 2.

The experimental protocol to compare spinal anesthetic effects of the four emulsified volatile anesthetics

n = 12	The order for intrathecal administration
A (n = 3)	E-halothane*	E-isoflurane**	E-enflurane§	E-sevoflurane†
B (n = 3)	E-sevoflurane	E-halothane	E-isoflurane	E-enflurane
C (n = 3)	E-enflurane	E-sevoflurane	E-halothane	E-isoflurane
D (n = 3)	E-isoflurane	E-enflurane	E-sevoflurane	E-halothane

Twelve rats were divided into four groups, as group A to D. Every rat received all the four emulsified volatile anesthetics at interval of two days according to the experimental order revealed in this table. For example, in group A, there were 3 rats received agents in an order from emulsified halothane, to emulsified isoflurane, to emulsified enflurane and to emulsified sevoflurane.

^*Indicated emulsified halothane;

^**Indicated emulsified isoflurane;

^§Indicated emulsified enflurane;

^†Indicated emulsified sevoflurane.