[Effects of BIS and AEPindex monitoring on the depth of anesthesia in in intravenous-inhalational anesthesia anesthesia].
OBJECTIVE
To evaluate the effects of bispectral index(BIS) and auditory evoked potentials index(AEPindex) monitoring on the depth of anesthesia in inhalation of isoflurane and target-controlled infusion(TCI) of propofol, and to observe the changes of BIS and AEPindex.


METHODS
Fourty ASA physical status I - II patients undergoing selective abdominal operations were divided into 2 groups randomly: Group I1(the end-tidal isoflurane concentration was 0.6 MAC, n=20) and Group I2(the end-tidal isoflurane concentration was 1.0 MAC, n=20). Anesthesia was induced with proprofol and vecuroninm. After the tracheal intubation, the patients were ventilated with 0.6/1.0 MAC isoflurane in pure oxygen, and after 20 minutes, propofol was administered with TCI according to the different target plasma concentrations from 1.0 g/mL to 3.0 g/mL(increasing 0.5 g/mL each time). The changes of MAP, HR, BIS and AEPindex were recorded simultaneously.


RESULTS
There was no close correlation between MAP, HR and the end-tidal isoflurane concentration, target plasma concentration of propofol. The correlation coefficiencies between BIS, AEPindex and the end-tidal isoflurane concentration were -0.757, -0.819 and -0.832, -0.878 (P<0.001), respectively; those between BIS, AEPindex and the target plasma concentration of propofol were -0.932, -0.888 and -0.920, -0.923 (P<0.001). The correlation coefficiencies between BIS, AEPindex and the stimulation of endotracheal intubation were -0.728 and 0.544, respectively; however, there was no close correlation between BIS , AEPindex and the stimulation of skin incision, and exploration.


CONCLUSIONS
BIS and AEPindex are reliable parameters to monitor the depth of anesthesia of isoflurane and propofol combined anesthesia; and in response to the stimulation of tracheal intubation, AEPindex is better than BIS, but BIS and AEPindex can not be used to predict the cardiovascular reaction of skin incision and exploration.
Yang
Hao-Bo
HB
Department of Anesthesiology, Xiangya Hospital, Central South University, Changsha 410008, China. yanghaobo@yahoo.com.cn
Guo
Qu-Lian
QL
D000005:Abdomen / Q000601:surgery; D000758:Anesthesia / Q000379:methods; D019162:Anesthetics, Combined / Q000008:administration & dosage*; D018685:Anesthetics, Inhalation / Q000008:administration & dosage*; D018686:Anesthetics, Intravenous / Q000008:administration & dosage*; D001794:Blood Pressure / Q000187:drug effects; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory / Q000187:drug effects*; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D007530:Isoflurane / Q000008:administration & dosage; D008297:Male; D015742:Propofol / Q000008:administration & dosage; D014673:Vecuronium Bromide / Q000008:administration & dosage
D019162:Anesthetics, Combined; D018685:Anesthetics, Inhalation; D018686:Anesthetics, Intravenous; D014673:Vecuronium Bromide; D007530:Isoflurane; D015742:Propofol