目的观察听觉诱发电位指数在全麻诱导插管期间的变化，评价其用于临床麻醉深度监测的有效性。
Objective To observe the changes of auditory evoked potentials index(AEPI)during induction and tracheal intubation and evaluate its effectiveness on anaesthesia depth monitoring.
目的应用脑电双频谱指数（BIS）监测常规经验麻醉下瓣膜置换术病人的麻醉深度（意识水平），观察BIS在伤害性刺激时的变化。
Objective: To study the degree of routine anesthesia depth in cardiac valve replacement patients monitored by bispectral index (BIS), and to find out the relationship between BIS and stimulus.
目的评价熵指数监测麻醉深度与反映伤害性刺激的效应。
Objective To investigate the efficacy of spectral entropy measurement in reflection of depth of anesthesia and noxious stimulation.
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