in 120 premedicated patients undergoing general surgery , anaesthesia was induced with thiopentone 3 mg kg-1 , preceded by alfentanil 4.5 , 9.0 or 13.5 micrograms kg-1 or fentanyl 1.5 micrograms kg-1 .
C0002026
alfentanil
C0015846
fentanyl