Analysis of the bispectral index (BIS) and the EEG nonlinear index during the sedation by the target-controlled infusion of propofol
- VernacularTitle:异丙酚靶控输注镇静时脑电双频指数和非线性参数变化分析
- Author:
Mingwen OUYANG
;
Dongyu WU
;
Hong ZHANG
- Publication Type:Journal Article
- Keywords:
propofol;
target-controlled infusion;
conscious sedation;
bispectral index;
nonlinear index
- From:
Medical Journal of Chinese People's Liberation Army
1981;0(06):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the bispectral index (BIS) and the EEG nonlinear index (including Correlation dimension, D2; Approximate entropy, ApEn; Complexity, Cx.) during alternating periods of consciousness and unconsciousness produced by target-controlled infusions (TCI) of propofol. Methods We studied twenty patients (ASA Ⅰ～Ⅱ grades) undergoing the elected leg operations under epidural anesthesia. With TCI consciousness of the patient was controlled by an increase or decrease of concentration of propofol in a range of 0.3～0.5?g/ml for four times. Every target plasma concentration of propofol lasted 12 minutes. BIS, D2, ApEn and Cx were recorded simultaneously during the periods of consciousness and unconsciousness every 3 minutes. Results During consciousness and unconsciousness, the respective mean values for the four measurements were: BIS, 80.2?6.2 and 67.3?7.9; D2, 3.45?0.18 and 3.01?0.16; ApEn, 0.84?0.05 and 0.71?0.06; Cx, 0.55?0.05 and 0.44?0.05. Determined threshold values with 100% specificity during the state of unconsciousness were: BIS, 51 (sensitivity3.8%); D2, 2.90 (sensitivity 30.3%); ApEn, 0.69 (sensitivity42.3%); Cx, 0.41 (sensitivity 25.5%). Conclusion BIS, D2, ApEn and Cx can all reflect the change in consciousness and unconsciousness produced by TCI of propofol. Our findings suggest that of the four EEG variables, ApEn was best in identifying the transition from unconsciousness to consciousness.
