METHODS	After ethics committee approval , we randomized women scheduled for cesarean section to 4 groups to receive 5 mg of 0.25 % bupivacaine with ( n = 51 ) or without ( n = 6 ) saline EVE ; 5 mg of 025 % L-bupivacaine ( n = 50 ) ; or 6 mg of 03 % L-bupivacaine ( n = 50 ) .\