Protocolized Initiation of Clonidine to Prevent Dexmedetomidine Withdrawal

Participants will be observed for dexmedetomidine withdrawal and clonidine will be started at clinician discretion.

"* Observe participants without initiating clonidine with dexmedetomidine infusion time of 72-119 hours. To wean off dexmedetomidine, decrease the infusion by 25% of the starting dose every 6 hours.~* Begin clonidine at 1 mcg/kg enterally every 6 hours for participants with dexmedetomidine infusion time of 120-144 hours.~* Begin clonidine at 1.5 mcg/kg enterally every 6 hours for participants with dexmedetomidine infusion times of 145-167 hours.~* Begin clonidine at 2 mcg/kg enterally every 6 hours for participants with dexmedetomidine infusion time of \>/= 168 hours or with infusion time of 120-167 hours at doses \>/= 1.1 mcg/kg/min.~* If clonidine is started decrease the dexmedetomidine infusion by 25% of the starting dose 1 hour after each dose of clonidine until off (wean every 6 hours)."