关键词: 气管导管, 血气分析, 全身麻醉, 卧位, 机械通气

Abstract: 【Abstract】 Objective To observe the effect of improved extension tube for endotracheal tube （IETET）on the pediatric patients undergoing spinal surgery under prone position. Methods Thirty-two subjects, aged from 4 to 14 years old and with the ASA of Ⅰ or Ⅱ, were enrolled and assigned to the observation group and control group（n=16 for each）. All the children underwent operation under the mode of pressure controlled ventilation, and children in the observation group were given the IETET while the control ones were given the traditional ET. The differences in tidal volume （VT）, minute ventilation（MV）, dynamic lung compliance（Cdyn）, blood oxygen saturation（SpO2）, and end-tidal carbon dioxide partial pressure （PETCO2） between the two groups were compared, so were the indexes of blood gas analysis, as well as the slipping percentages. Results There was no statistically difference in VT, SpO2, PETCO2, duration of anesthesia and operation between the two groups（P>0.05）, but MV and Cdyn in theobservation group were significantly greater than those in the control one（P=0.028 and 0.021）. There were also no statistically differences in pH value, PaO2, and PaCO2 between the two groups before anesthesia and after the awakening （P>0.05）. There were one case in observation group and two cases in control group encountering slipping, respectively, but the slipping rates between the two groups were not statistically significant. Meanwhile, the lasting time of solid contact between the ET and ventilator circuits was significantly longer in the observation group when compared with the control one. Conclusion The IETET can help increase MV and Cdyn，and strengthen the fastness between ET and ventilator circuits for the pediatric patients undergoing spinal surgery under prone position.

Key words: Prone position, Blood gas analysis, General anesthesia, Mechanical ventilation, Endotracheal tube