CONCLUSIONS	Ropivacaine ( 0.4 % ) , ropivacaine ( 0.2 % ) plus ketamine ( 0.25 mg x kg ( -1 ) ) and ropivacaine ( 0.2 % ) plus tramadol ( 0.5 mg x kg ( -1 ) ) provided sufficient analgesia in children , but the duration of analgesia was longer in the RT group .\