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<0.05.