2Mordecai M M,Brull S J.Spinal anesthesia.Curr Opin Anaesthesiol,2005,18(5):527-533.
3Fettesp D,Hocking G,Petersonmk,et al.Comparison of plain and hyperbaric solutions of ropivacaine for spinal anaesthesia.Br J Anaesth,2005,94(1):107-111.
4Kallioh S,Nallev M,Tuomas CA,et al.Comparison of hyper-baric and plain ropivacaine 15 mg in spinal anaesthesia for lower limb surgery.Br J Anaesth,2004,93(5):664-669.
