Abstract: Objective To compare the sedative effect of different regimens of dexmedetomidine in day-case ophthalmic surgery. Methods Fifty patients, ASA Ⅰ-Ⅱ, who underwent elective ophthalmic surgery, were randomly divided into two groups with 25 in each: The dexmedetomidine(group A) and dexmedetomidine midazolam plus sufentanil (group B). In group A, the loading dose of dexmedetomidine was 0.7 μg/kg, followed by 0.5 μg/(kg·h) dexmedetomidine. In group B, the loading dose was midazolam 1.5 mg and sufentanil 5 μg, followed by 0.5 μg/(kg·h) dexmedetomidine. Intra-operative heart rate (HR), mean arterial pressure (MAP), bispectral index (BIS), oxygen saturation (SPO₂) and Ramsay scores, Aldrete score, satisfaction score of patient and surgeon were recorded. Results At T2, T4-T6 time points, the Ramsay scores of group B were lower than that of group A (P＜0.05). The MAP was lower in group B than group A at T3-T7 time points; The HR was higher(P＜0.05) in group B than group A at T2 and T3 time points. Patient satisfaction was significant different between the two groups, the IOWA scores of group B was higher than that of group A(P＜0.05).There were no significant differences between the two groups in BIS, SPO₂ and surgeon satisfaction. Conclusions The combination of dexmedetomidine midazolam plus sufentanyl appears to have more advantages in day-case ophthalmic surgery regarding hemodynamic stability, sedation effect and patient satisfaction.

Key words: dexmedetomidine, day-case ophthalmic surgery, Ramsay score