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Open Access Research

Prospective study comparing skin impedance with EEG parameters during the induction of anaesthesia with fentanyl and etomidate

M Winterhalter1*, S Münte4, M Gerhard3, O Danzeisen1, T Jüttner1, E Monaca1, L Hoy2, N Rahe-Meyer3 and P Kienbaum1

Author Affiliations

1 Department of Anaesthesiology, University of Düsseldorf, Germany

2 Department of Biometry, Hannover Medical School, Germany

3 Department of Anaesthesiology, Hannover Medical School, Germany

4 Department of Anaesthesiology, Helsinki University Clinics, Hospital for Children and Adolescent, Finland

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European Journal of Medical Research 2010, 15:47-53  doi:10.1186/2047-783X-15-2-47

Published: 26 February 2010

Abstract

Objective

Sympathetic stimulation leads to a change in electrical skin impedance. So far it is unclear whether this effect can be used to measure the effects of anaesthetics during general anaesthesia. The aim of this prospective study is to determine the electrical skin impedance during induction of anaesthesia for coronary artery bypass surgery with fentanyl and etomidate.

Methods

The electrical skin impedance was measured with the help of an electro-sympathicograph (ESG). In 47 patients scheduled for elective cardiac surgery, anaesthesia was induced with intravenous fentanyl 10 μg/kg and etomidate 0.3 mg/kg. During induction, the ESG (Electrosympathicograph), BIS (Bispectral IndeX), BP (arterial blood pressure) and HR (heart rate) values of each patient were recorded every 20 seconds. The observation period from administration of fentanyl to intubation for surgery lasted 4 min.

Results

The ESG recorded significant changes in the electrical skin impedance after administration of fentanyl and etomidate(p < 0.05). During induction of anaesthesia, significant changes of BIS, HR and blood pressure were observed as well (p < 0.05).

Conclusions

The electrical skin impedance measurement may be used to monitor the effects of anesthetics during general anaesthesia.

Keywords:
skin impedance; general anaesthesia; fentanyl; etomidate; cardiac surgery