The median time to successful intubation was 33 seconds ( IQR , 24-45 seconds ) for the remifentanil group versus 36 seconds ( IQR , 25-59 seconds ) for the morphine-medazolam group ( P = .359 ) at the first attempt and 45 seconds ( IQR , 35-64 seconds ) versus 56 seconds ( IQR , 44-68 seconds ) , respectively , for the second attempt ( P = .302 ) .