Conclusion The effects of enflurane, isoflurane and desflurane are biphasic: excitation at lower concentrations, and depression of sympathetic activity and arterial pressure at higher concentrations.

• 结论恩氟烷、异氟烷和地氟烷低浓度兴奋交感神经，高浓度抑制交感神经活动和降低血压。