Mortality due to anesthesia exposure in the spontaneously breathing groups and the mechanically ventilated groups.

IS = Isoflurane spontaneously breathing group;SS = Sevoflurane spontaneously breathing group;IM = Isoflurane mechanically ventilated group;SM = Sevoflurane mechanically ventilated group.Anesthesia mortality in isoflurane and sevoflurane spontaneously breathing groups was significantly higher than isoflurane and sevoflurane mechanically ventilated groups, respectively.p

IS为异氟烷自主呼吸组（Isoflurane spontaneously breathing group）；SS为七氟烷自主呼吸组（Sevoflurane spontaneously breathing group）；IM为异氟烷机械通气组（Isoflurane mechanically ventilated group）；SM为七氟烷机械通气组（Sevoflurane mechanically ventilated group）。异氟烷自主呼吸组的麻醉死亡率显著高于异氟烷机械通气组，七氟烷自主呼吸组的麻醉死亡率则显著高于七氟烷机械通气组。