patients woke 2.7 +/- 3.1 min following discontinuation of nitrous oxide and were extubated after 10.3 +/- 7.6 min ( alfentanil ) and 17.3 +/- 19.0 min ( fentanyl ) ( p = 0.1 ) .
C0002026
alfentanil
C0015846
fentanyl