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Intensive Care Medicine

, Volume 42, Issue 8, pp 1223–1233 | Cite as

Systematic review of cardiac output measurements by echocardiography vs. thermodilution: the techniques are not interchangeable

  • Mik Wetterslev
  • Hasse Møller-Sørensen
  • Rasmus Rothmann Johansen
  • Anders PernerEmail author
Systematic Review

Abstract

Purpose

Echocardiography is frequently used in the hemodynamic evaluation of critically ill patients, but inaccurate measurements may lead to wrong clinical decisions. The aim of our systematic review was to investigate the interchangeability of echocardiography with thermodilution technique in measuring cardiac output and its changes.

Methods

In August 2015 we systematically searched electronic databases and included studies investigating the echocardiographic measurement of cardiac output compared with thermodilution technique using the Bland–Altman method. Two authors independently reviewed the studies and extracted data on type of measurements, clinical setting and characteristics, and those of the Bland–Altman and trending ability analyses.

Results

We identified 13,834 citations and included 24 studies in the final analysis. The median number of participants was 32 (range 8–65). Most of the studies assessed left-sided heart structures and the majority had small bias, wide limits of agreement, and high percentage error between echocardiography and thermodilution. In only two of the 24 studies the precision of each technique (echocardiography and thermodilution) was assessed before comparing them. In the single study evaluating trending ability using valid methodology, agreement was observed between echocardiography and thermodilution in detecting the directional changes in cardiac output, but the magnitude of changes varied considerably.

Conclusions

The majority of studies comparing echocardiography with thermodilution were difficult to interpret, but current evidence does not support interchangeability between these techniques in measuring cardiac output. The techniques may be interchangeable in tracking directional changes in cardiac output, but this has to be confirmed in large high-quality studies.

Keywords

Cardiac output Critical care Echocardiography Hemodynamic monitoring Intensive care unit Thermodilution technique 

Notes

Compliance with ethical standards

Conflicts of interest

None of the authors have potential conflicts of interest.

Funding

Department funds only.

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Copyright information

© Springer-Verlag Berlin Heidelberg and ESICM 2016

Authors and Affiliations

  • Mik Wetterslev
    • 1
  • Hasse Møller-Sørensen
    • 2
  • Rasmus Rothmann Johansen
    • 1
  • Anders Perner
    • 1
    Email author
  1. 1.Department of Intensive Care, Section 4131Copenhagen University Hospital, RigshospitaletCopenhagenDenmark
  2. 2.Department of Cardiothoracic AnaesthesiologyCopenhagen University Hospital, RigshospitaletCopenhagenDenmark

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