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British Journal of Anaesthesia, Vol 78, Issue 3 323-325, Copyright © 1997 by The Board of Management and Trustees of the British Journal of Anaesthesia

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Validation of thoracic electrical bioimpedance as a porcine research tool

C. J. Broomhead, S. J. Wright, K. M. Kiff and P. S. Withington
Department of Anaesthetics, University College London Hospitals, Middlesex Hospital, Mortimer Street, London W1N 8AA; Department of Anaesthetics, Royal Hospitals Trust, St Bartholomew's Hospital, West Smithfield, London EC1; Department of Anaesthetics, Royal Hospitals Trust, Royal London Hospital, Whitechapel Road, London E1 1BB

We have compared the accuracy of two methods of measuring cardiac output, thoracic electrical bioimpedance (TEB) and thermodilution (TD), in pigs. We studied four anaesthetized pigs, producing 145 paired cardiac output values over a range of TD cardiac outputs of 2.6-12.6 litre min-1. TEB cardiac output was less than that measured by TD, by a constant factor throughout the observed range of values, because of differences in porcine thoracic shape. The Pearson product moment correlation coefficient suggested a good correlation (r = 0.984, P < 0.001). More importantly, analysis by the Bland and Altman statistical method suggested a high level of agreement, with 95% confidence intervals of +/- 1.0 litre min-1. These results suggest that TEB can be used as a satisfactory method to measure cardiac output in porcine models.
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