310,Paech M.New epidural techniques for labour analgesia:patient-controlled epidural analgesia and combined spinalepidural analgesia.Baillieres Clin Obstet Gynaecol, 1998,12∶377-395.
411,Sia AT,Chong JL.Epidural 0.2% ropivacaine for labour analge:parturient-controlled or continuous infusion?Anaesth Intensive Care,1999,27∶154-158.
512,Price C,Lafreniere L,Brosnan C,et al.Regional analgesia in early active labour:combined spinal epidural vs epidural.Anaethesia, 1998,53∶951-955.
613,Burnstein R,Buckland R,Picket JA,et al.A survey of epidural analgesia for labour in the United Kingdom.Anaesthesia,1999,54∶634-640.
714,Dresner M,Bamber J,Calow C,et al.Comparison of low-dose epidural with combined spinal-epidural analgesia for labour.Br J Anaesthesia,1999,83∶756-760.
815,Van de Velde M,Mignolet K,Vandermeersch E,et al.Prospective,randomized comparison of epidural and combined spinal epidural analgesia during labor.Acta Anaesthesiol Belg,1999,50∶129-136.
91,Dawson-Basoa M,Gintzler AR.Gestational and ovarian sex steroid antinocieption:synergy between spinal kappa and delta opioid systems.Brain Res,1998,794∶61-67.
102,Dawson-Basoa M,Gintzler AR.Involvement of apinal cord delta opiate receptors in the antinociception of gestation and its hormonal simulation.Brain Res,1997,757∶37-42.