Effect of dexmedetomidine on median effective target effect-site concentration of sufentanil inhibiting body movement evoked by skin incision in patients undergoing bilateral subtotal thyroidectomy
10.3760/cma.j.issn.0254-1416.2011.05.004
- VernacularTitle:右美托咪啶对舒芬太尼抑制甲状腺切除术患者切皮时体动反应半数有效效应室靶浓度的影响
- Author:
Yingzhi LIU
;
Zhishuang MA
;
Yongbo LIU
;
Shiduan WANG
;
Cheng XU
- Publication Type:Journal Article
- Keywords:
Dexmedetomidine;
Sufentanil;
Drug delivery systems;
Dose-response relationship;
drug;
Thyroidectomy
- From:
Chinese Journal of Anesthesiology
2011;31(5):536-538
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of dexmedetomidine on median effective target effect-site concentration ( EC50) of sufentanil inhibiting body movement evoked by skin incision in patients undergoing bilateral subtotal thyroidectomy. Methods Thirty-nine ASA I or II patients of both sexes aged 20-64 yr with a body mass index of 20-25 kg/m2 undergoing bilateral subtotal thyroidectomy were randomly divided into 2 groups: control group (group C) and dexmedetomidine group (group D). The patients were premedicated with intramuscular phenobarbital 0.1 g and scopolamine 0.3 mg. In group D dexmedetomidine 0.6 μg/kg was injected iv over 10 min at S min before induction of anesthesia. Anesthesia was induced with target-controlled infusion (TCI) of propofol and sufentanil. The target plasma concentration of propofol was set at 3.0 μg/ml which was maintained until the end of operation. TCI of sufentanil was started at 10 min after initiation of propofol TCI. The initial target effect-site concentration was set at 0.20 ng/ml and decreased/increased by 20% in the next patient according to whether the patient's body moved or not within 1 min after skin incision. Laryngeal mask airway was inserted at 3 min after initiation of sufentanil TCI. Spontaneous breathing was maintained. Skin incision was made at 10 min after initiation of sufentanil TCI. The EC50 and 95% confidence interval (CI) of sufentanil inhibiting skin incision-evoked body movement were calculated with sequential method. Results EC50, of sufentanil was 0.1148 ng/ml (95% CI 0.1055-0.1249 ng/ml) in group D and 0.1454 ng/ml (95% CI 0.1339-0.1580 ng/ml) in group C, and was significantly lower in group D than in group C. Conclusion Dexmedetomidine 0.6 μg/kg infused iv before operation can reduce the EC50 of sufentanil inhibiting body movement evoked by skin incision in patients undergoing bilateral subtotal thyroidectomy.
