Bioreactance is a reliable method for estimating cardiac output at rest and during exercise

Thomas Jones, David Houghton, Sophie Cassidy, Guy MacGowan, Michael Trenell, Djordje Jakovljevic

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33 Citations (Scopus)
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Background: Bioreactance is a novel noninvasive method for cardiac output measurement that involves analysis of blood flow-dependent changes in phase shifts of electrical currents applied across the thorax. The present study evaluated the test-retest reliability of bioreactance for assessing haemodynamic variables at rest and during exercise.Methods:22 healthy subjects (26 (4) yrs) performed an incremental cycle ergometer exercise protocol relative to their individual power output at maximal O2 consumption (Wmax) on two separate occasions (trials 1 and 2). Participants cycled for five 3 min stages at 20, 40, 60, 80 and 90% Wmax. Haemodynamic and cardiorespiratory variables were assessed at rest and continuously during the exercise protocol.Results:Cardiac output was not significantly different between trials at rest (P=0.948), or between trials at any stage of the exercise protocol (all P>0.30). There was a strong relationship between cardiac output estimates between the trials (ICC=0.95, P0.15), and strong relationships between trials were found (ICC=0.83, P
Original languageEnglish
Pages (from-to)386-391
JournalBritish Journal of Anaesthesia
Issue number3
Early online date6 Feb 2015
Publication statusPublished - 1 Sept 2015
Externally publishedYes


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