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

Ferreira, D. A.; Nunes, Catarina S.; Antunes, L. M.; Santos, I. A.; Lobo, F.; Casal, M.; Ferreira, L.; Amorim, Pedro

http://hdl.handle.net/10400.2/13906

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Abstract(s)

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 kg 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, remifentanil Haemodynamic phenomena, heart rate, blood pressure Anaesthesia general, depth monitoring Electroencephalography, bispectral index Anaesthetics intravenous, propofol

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http://hdl.handle.net/10400.2/13906

Citation

Ferreira, D. A.; Nunes, C. S.; Antunes, L. M.; Santos, I. A.; Lobo, F.; Casal, M.; Ferreira, L.; Amorim, P. The effect of a remifentanil bolus on the bispectral index of the EEG (BIS) in anaesthetized patients independently from intubation and surgical stimuli. European Journal of Anaesthesiology 23(4):p 305-310, April 2006.