tokens: The current sedation protocol progressively increased the rate of successful sedation ( able to complete the imaging study ) when using dexmedetomidine alone from 91 . 8 % to 97 . 6 % ( P = 0 . 009 ) , reducing the requirement for adjuvant pentobarbital in the event of sedation failure with dexmedetomidine alone and decreased the mean recovery time by 10 min ( P < 0 . 001 ) .