1Ben-David B,Frankel R,Arzumonovt T.Minidose bupivacaine-fentanyl spinal anesthesia for surgical reapir of hip fracture in the aged.Anesthesiology,2000,92:6-10.
2Cooper JR Jr.Use of LMA and a sequential technique for unanticipated difficult intubations.Anesthesiology,2002,97:1326.