METHODS	Patients were divided into three treatment groups according to the epidural solution infused : group 1 ( n = 10 ) 0.1 % bupivacaine + 5 microg x ml ( -1 ) fentanyl ; group 2 ( n = 12 ) 0.0625 % bupivacaine + 5 microg x ml ( -1 ) fentanyl ; group 3 ( n = 9 ) 0.9 % sodium chloride ( placebo ) .\