摘要
背景脑电双频指数（bispectralindex，BIS）可监测患者在全麻状态下的意识水平。在不影响麻醉深度的情况下，有些因素可影响BIS数值。本实验目的在于观察改变患者体位是否对BIS值有影响。方法选取40例在全麻下行短小手术的患者。首先将患者置于平卧位（仰卧位）15分钟，记录BIS值、平均动脉压、心率、呼气末二氧化碳分压和呼气末异氟烷浓度。然后改变患者体位，将患者置于头低仰卧位（30°）。最后将患者置于头高仰卧位（30°）。每种体位保持15分钟并记录数据。结果与平卧位相比头低位的BIS值显著增高（中位数47VS40），而头高位的BIS值显著降低（39VS41）（P〈0．05）。结论患者体位的改变明显影响了BIS值，由此可影响对麻醉深度的判断。
BACKGROUND： Bispectral index （BIS） was developed to monitor patients＇ level of consdousness under general anesthesia. Several factors have been found to alter BIS readings without affecting the depth of anesthesia. We conducted a study to assess the impact of changing patients＇ position on BIS readings. METHODS： General anesthesia was administered to 40 patients undergoing minor surgeries. Patients were kept in neutral position （supine） for 15 rain and BIS readings, mean arterial blood pres- sure, heart rate, end-tidal carbon dioxide, and end-tidal isoflurane were recorded. Patients were then shifted to bead-down position （30°）, neutral position, and lastly head-up position （30°） each of 15-rain duration and the data were recorded. RESULTS： There was a significant increase in BIS values in head-down position （median 47 vs 40） oompared with neutral position, whereas head-up position significantly decreased BIS （39 vs 41） compared with neutral position （P 〈 0. 05）. CONCLUSION： Changing a patient＇s position significantly affects the BIS values, which might affect the interpretation of anesthetic depth.
出处
《麻醉与镇痛》
2012年第1期85-88,共4页
Anesthesia & Analgesia
