Objective To assess the effects of dexmedetomidine(Dex) on propofol dosage in target-controlled infusion(TCI) and hemodynamics in patients undergoing laparoscopic surgery under general anesthesia. Methods Sixty patients undergoing laparoscopic surgery under general anesthesia were randomly divided into control group(n=30) and the Dex group(n=30).The patients in Dex group received a loading dose of Dex(1 μg/kg, infused within 10 min) before the surgery followed by continuous infusion at the rate of 0.3 μg · ...