Assessment of stroke volume index with three different bioimpedance algorithms: lack of agreement compared to thermodilution

Intensive Care Medicine
Eric E C de WaalWolfgang F Buhre

Abstract

The accuracy of bioimpedance stroke volume index (SVI) is questionable as studies report inconsistent results. It remains unclear whether the algorithms alone are responsible for these findings. We analyzed the raw impedance data with three algorithms and compared bioimpedance SVI to transpulmonary thermodilution (SVI(TD)). Prospective observational clinical study in a university hospital. Twenty adult patients scheduled for coronary artery bypass grafting (CABG). SVI(TD) and bioimpedance parameters were simultaneously obtained before surgery (t1), after bypass (t2), after sternal closure (t3), at the intensive care unit (t4), at normothermia (t5), after extubation (t6) and before discharge (t7). Bioimpedance data were analyzed off-line using cylinder (Kubicek: SVI(K); Wang: SVI(W)) and truncated cone based algorithms (Sramek-Bernstein: SVI(SB)). Bias and precision between the SVI(TD) and SVI(K), SVI(SB), and SVI(W) was 1.0+/-10.8, 9.8+/-11.4, and -15.7+/-8.2 ml/m2 respectively, while the mean error was abundantly above 30%. Analysis of data per time moment resulted in a mean error above 30%, except for SVI(W) at t2 (28%). Estimation of SVI by cylinder or truncated cone based algorithms is not reliable for clinical decision mak...Continue Reading

References

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Citations

Mar 20, 2009·Current Opinion in Anaesthesiology·Eric E C de WaalWolfgang F Buhre
Jan 4, 2012·Pediatric Critical Care Medicine : a Journal of the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies·Avihu Z Gazit, David S Cooper
Aug 21, 2012·Biomedical Engineering Online·Maurits K KoningsFrank E Rademakers
Jun 12, 2014·Journal of Cardiothoracic and Vascular Anesthesia·Jean-Luc Fellahi, Marc-Olivier Fischer
May 8, 2013·Chest·Steven M Hollenberg
Sep 2, 2011·Journal of Cardiothoracic and Vascular Anesthesia·Jean-Luc FellahiJean-Luc Hanouz
Mar 1, 2011·Journal of Cardiothoracic and Vascular Anesthesia·Timothy M MausGerard R Manecke
Feb 3, 2011·British Journal of Clinical Pharmacology·Bart F GeertsJos R Jansen
Nov 27, 2010·Clinical Physiology and Functional Imaging·Kathleen TomsinWilfried Gyselaers
May 13, 2014·Paediatric Anaesthesia·Estelle VergnaudGilles A Orliaguet
Aug 27, 2015·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Olivier GavarryAlain Boussuges
Apr 17, 2015·Indian Journal of Critical Care Medicine : Peer-reviewed, Official Publication of Indian Society of Critical Care Medicine·Olfa HamzaouiJean-Louis Teboul
May 9, 2012·Physiological Measurement·Manfred G MoertlHelmut K Lackner
May 15, 2012·Anaesthesia and Intensive Care·E Litton, M Morgan
Dec 7, 2013·Current Opinion in Anaesthesiology·Christoph K HoferMichael T Ganter

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Methods Mentioned

BETA
coronary artery bypass

Software Mentioned

SPSS
LabView
PRISM
GraphPad

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