Table 1. Table 1 provides all different groups in the study.

Group *	Sedation	Acetaminophen
Group 1 (P)	Propofol	No
Group 2 (P+A)	Propofol	Yes
Group 3 (D)	Dexmedetomidine	No
Group 4 (D+A)	Dexmedetomidine	Yes

*All groups will receive bolus doses of IV opioids (morphine and hydromorphone) as needed for breakthrough pain. I.V. Acetaminophen will be given to group 1 and group 3 every 6 hours for 48 hours, postoperatively.