2Curelaru I,subarachnoid anaesthesia with continuous epidural block [J].Anaesthesia,1979;14:71
3Dirkes wE,The effect of subarachnoid lidocaine and combined subarachnoid lidocaine and epidural bupivacaine on electrical sensory thresholds[J].Geg Anesth.1991;16:2102
4Rawal Netal,Epidural versus combined spinal epidural block for caesarean section[J].Acta Anaesthesiol Scand.1988;32:61
5Carrie LES,Extradural spinal or combind block for obstetric surgical anaesthesia[J].BR J Anaesth,1990;65:225
6Hurley RJ,Hertwig LM,Lambert DH.Incidence of postdural puncure headache in the obstetric patient:25 gauge whitacre vs 26 and 27 gauge Quinck tip ne edles[J].Reg Anesth,1992;17:33