Effect of Dexmedetomidine of Gastrointestinal Motility

Patients will undergo the usual anal manometry study, with no adjuvant medications, per routine practice currently in the gastrointestinal unit. Following completion of manometry, 0.5 mcg/kg DEX will be administered over 1 minute followed by an infusion of 0.15 mcg/kg/hr. Manometry measurements will be followed for 15 minutes in response to DEX.