The use of ondansetron with dexamethasone is more effective in preventing postanesthetic shivering.

• 结论：麻醉诱导前静脉注射大剂量恩丹西酮（8mg）可有效地预防术后寒颤，联合应用地塞米松可以增强恩丹西酮的作用，减少其剂量。