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A continuous infusion of DEX 6.0 mcg/kg/h was started at 1320. Following an IV bolus of hydroxyzine 15 mg, an IV infusion of cefmetazole 1 g diluted with normal saline (NS) 100 mL was administered. Pentazocine 12 mg was given as an IV bolus at 1328. The DEX infusion rate was reduced to 0.7 mcg/kg/h at 1330, at which point the patient's blood pressure, pulse rate, respiratory rate, and SpO 2 were 100/73 mm Hg, 60 bpm, 16 breaths/min, and 96%, respectively. At this time his Ramsay sedation score (RSS) was 3 to 4, which corresponded to moderate sedation. The patient