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Can bispectral index or auditory evoked potential index predict implicit memory during propofol-induced sedation?

摘要:

Background Some patients still suffer from implicit memory of intraoperative events under adequate depth of anaesthesia. The elimination of implicit memory should be a necessary aim of clinical general anaesthesia.However, implicit memory cannot be tested during anaesthesia yet. We propose bispectral index (BIS) and auditory evoked potential index (AEPI), as predictors of implicit memory during anaesthesia.Methods Thirty-six patients were equally divided into 3 groups according to the Observer's Assessment of Alertness/Sedation Score: A, level 3; B, level 2 ;and C, level 1. Every patient was given the first auditory stimulus before sedation. Then every patient received the second auditory stimulus after the target level of sedation had been reached. BIS and AEPI were monitored before and after the second auditory stimulus presentation. Four hours later, the inclusion test and exclusion test were performed on the ward using process dissociation procedure and the scores of implicit memory estimated.Results In groups A and B but not C, implicit memory estimates were statistically greater than zero (P<0.05).The implicit memory scores in group A did not differ significantly from those in group B (P>0.05). Implicit memory scores correlated with BIS and AEPI (P<0.01). The area under ROC curve is BIS> AEPI. The 95% cutoff points of BIS and AEPI for predicting implicit memory are 47 and 28, respectively.Conclusions Implicit memory does not disappear until the depth of sedation increases to level 1 of OAA/S score. Implicit memory scores correlate well with BIS and AEPI during sedation. BIS is a better index for predicting implicit memory than AEPI during propofol induced sedation.

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作者单位: Department of Anaesthesiology, Beijing Chaoyang Hospital, Capital University of Medical Sciences, Beijing 100020, China [1] Department of Anaesthesiology, PLA General Hospital, Beijing 100853, China [2]
期刊: 《中华医学杂志(英文版)》2006年119卷11期 894-898页 SCISCIEMEDLINEISTICCSCDCABP
分类号: R76
栏目名称: ORIGINAL ARTICLES
发布时间: 2006-06-26
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