Different EEG analysis of low flow xenon anaesthesia during laporoscopic surgery
European Society of Anaesthesiologists; 8th Annual Meeting with the Austrian International Congress; Vienna, Austria, 1-4 April 2000
Department of Anaesthesiology, Surgery Institute N.A. Vishnevsky, Moscow, Russia
Background and goal of study: Zenon is well known as a good anaesthetic agent [1, 2]. The goal of the study is analysis of changes of bispectral index of EEG (BIS) and informational saturation of EEG (INEEG)  during xenon anaesthesia.
Materials and methods: We studied 24 patients (ASA I-II) undergoing abdominal laporoscopic technic surgery. After induction (propofol 1.8 ± 9.3 mg kg−1 i.v.; tracrium 0.5 mg kg−1 i.v. + xilocain spray −10% local) and intubation anaesthesia was maintained with 70 ± 1% xenon and O2 (close system) supplemented with fentanyl 1.48 ± 0.71 μg kg−1 h−1 i.v. We used low flow technique. Fresh flows were Xe-0.14 ± 0.02 L min−1. O2-0.25 ± 0.05 L min. Duration of anaesthesia was 58-270 min. BIS was recorded by the apparatus A-1000 (Aspect Medical System Inc., USA), the INEEG calculated by computer on a basis of our original programs . Data were analysed by independent Student's t-test and correlation analysis.
Results: Data are mean ± SD. TABLE
Fentanyl administration during increasing of the INEEG up to 57 ± 2 and BIS up to 59 ± 3 caused by surgical stimulation results in decreasing of both investigation parameters to Xenon 70% level. The correlation between investigation parameters was 90%.
Conclusion: The results indicate that INEEG and BIS have a good correlation during xenon anaesthesia, and xenon in 70% guarantees good anaesthesiologocal conditions for abdominal laporoscopic surgery.
1 Luttropp HH, Thomasson R, Dahm S et al. Acta Anaesth Scand
2 Burov NE, Kasatkin luN, Ibragimova GV et al. Anesth Rean
3 Lickvatzev V, Petrov O, Sitnikov A et al. Br J Anaesth
(Suppl. 1): A126.
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