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The effect of a remifentanil bolus on the bispectral index of the EEG (BIS) in anaesthetized patients independently from intubation and surgical stimuli

Published online by Cambridge University Press:  10 February 2006

D. A. Ferreira ,
C. S. Nunes ,
L. M. Antunes ,
I. A. Santos ,
F. Lobo ,
M. Casal ,
L. Ferreira  and
P. Amorim
D. A. Ferreira
Affiliation:
Universidade de Trás-os-Montes e Alto Douro, CECAV, Vila Real, Portugal
C. S. Nunes
Affiliation:
Universidade de Trás-os-Montes e Alto Douro, CECAV, Vila Real, Portugal Faculdade de Ciências da Universidade do Porto, Departamento de Matemática Aplicada, Porto, Portugal
L. M. Antunes
Affiliation:
Universidade de Trás-os-Montes e Alto Douro, CECAV, Vila Real, Portugal
I. A. Santos
Affiliation:
Hospital Geral de Santo António, Serviço de Anestesiologia, Porto, Portugal
F. Lobo
Affiliation:
Hospital Geral de Santo António, Serviço de Anestesiologia, Porto, Portugal
M. Casal
Affiliation:
Hospital Geral de Santo António, Serviço de Anestesiologia, Porto, Portugal
L. Ferreira
Affiliation:
Hospital Geral de Santo António, Serviço de Anestesiologia, Porto, Portugal
P. Amorim
Affiliation:
Hospital Geral de Santo António, Serviço de Anestesiologia, Porto, Portugal
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Extract

Summary

Background and objective: Remifentanil boluses are used in different clinical situations and the effects on bispectral index monitoring are unclear. We analysed the effect of a remifentanil bolus on the bispectral index of the electroencephalogram (bispectral index) under total intravenous anaesthesia with propofol and remifentanil. Methods: ASA I–III patients were included in this study. All patients received a 2 μg k g−1 remifentanil bolus in a period free from stimuli. Bispectral index and haemodynamic data were collected from an A-2000XP bispectral index monitor (every second) and an AS/3 Datex monitor (every 5 s). Bispectral index data were analysed using the area under the curve. Mean arterial pressure and heart rate were averaged at each 30-s period and analysed using analysis of variance. Results: A total of 240 bispectral index values were obtained per patient. The area under the curve between 90 and 120 s after the bolus was significantly lower than the basal area under the curve (average of all areas before the bolus, P < 0.05). Mean arterial pressure and heart rate were significantly reduced from 96.4 ± 19.9 mmHg at the time of the bolus to 74.2 ± 16.6 mmHg 120 s after, and from 70 ± 16.4 bpm at the time of the bolus to 61 ± 13.6 bpm after (P < 0.001), respectively. Conclusions: There was a significant reduction in the areas under the curve between 90–120 s following the bolus. Heart rate and blood pressure also showed significant reductions. Thus, remifentanil bolus given under total intravenous anaesthesia with propofol and remifentanil decreases bispectral index, an effect independent of intubation and surgical stimuli.

Keywords

OPIOIDS, remifentanilANAESTHETICS INTRAVENOUS, propofolHAEMODYNAMIC PHENOMENA, heart rate, blood pressureANAESTHESIA, GENERAL, depth monitoringELECTROENCEPHALOGRAPHY, bispectral index
Type
Original Article
Information
European Journal of Anaesthesiology , Volume 23 , Issue 4 , April 2006 , pp. 305 - 310
Copyright
© 2006 European Society of Anaesthesiology

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