in order to evaluate the safety of the new synthetic opioids , alfentanil and sufentanil , in neurosurgical patients , we administered sufentanil 1 microg/kg i.v. , alfentanil 50 microg/kg i.v . followed by an infusion of 1 microg/kg/min , or fentanyl 5 microg/kg i.v . to 30 patients with supratentorial tumors anesthetized with nitrous oxide ( n2o ) , 60 % in o2 .
C0002026
alfentanil
C0015846
fentanyl