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| Impact of Patients’s Positions on the Narcotrend Index During Intravenous Anaesthesia |
| address：Xiaolan Affiliated Hospital of Southern Medical University，Zhongshan 528415，China |
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Abstract Objective：To prospectively evaluate the effects of body position to the narcotrend index during intravenous anaesthesia.Method： 45 elective surgery patients aged from 20 to 60 years were selected in our hospital from July 2013 to December 2013，whom were 24 males and 21 females，with the BMI 17-23 kg/m2 and ASAI-Ⅱ level， the intravenous general anesthesia were underwent. Propofol and remifentanil anesthesia protocol was introduced and maintained with Target-controlled infusion（TCI） in supine position.5 min after reaching steady-state target concentration，the patients were changed in Trendelenburg position（30 degrees） and maintained about 10 min；10 min later，the position into anti-trendelenburg position were changed（ 30 degrees），also maintained about 10 min. Narcotrend Index（ NI）， mean arterial pressure（ MAP）， heart rate（ HR）， end-tidal carbon dioxide partial pressure （PETCO2） were recorded separately at the time points of before trendelenburg position（T0），immediately（T1），1 min（ T2） later， 3 min（T3） later，5 min（T4） later and 10 min（T5） later after in Trendelenburg position and antitrendelenburg position.Result：Compared the parameters in supine position（T0），patients’ MAP in Trendelenburg position at the time point of T2-5 increased，also the NI at the time piont of T2-4 ，the difference was statistically significant （P<0.05）.While， they were decreased in anti-trendelenburg position..The MAP at the point of T2-5，NI at the point of T2-4 were significantly lower in Trendelenburg position than in anti-trendelenburg position，the difference was statistically significant（ P<0.01）.Conclusion：Patients’ body position during intravenous anaesthesia can affect the Narcotrend index， of which will affect the anesthesiologists to judgment patients’ anesthesia depth.
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