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Journal of Clinical Monitoring and Computing

, Volume 30, Issue 5, pp 621–627 | Cite as

Comparison of the ability of two continuous cardiac output monitors to measure trends in cardiac output: estimated continuous cardiac output measured by modified pulse wave transit time and an arterial pulse contour-based cardiac output device

  • Takashi Terada
  • Ayano Oiwa
  • Yumi Maemura
  • Samuna Robert
  • Sayaka Kessoku
  • Ryoichi Ochiai
Original Research

Abstract

Estimated continuous cardiac output (esCCO), a noninvasive technique for continuously measuring cardiac output (CO), is based on modified pulse wave transit time, which in turn is determined by pulse oximetry and electrocardiography. However, its trending ability has never been evaluated in patients undergoing non-cardiac surgery. Therefore, this study examined esCCO’s ability to detect the exact changes in CO, compared with currently available arterial waveform analysis methods, in patients undergoing kidney transplantation. CO was measured using an esCCO system and arterial pressure-based CO (APCO), and compared with a corresponding intermittent bolus thermodilution CO (ICO) method. Percentage error and statistical methods, including concordance analysis and polar plot analysis, were used to analyze results from 15 adult patients. The difference in the CO values between esCCO and ICO was −0.39 ± 1.15 L min−1 (percentage error, 35.6 %). And corrected precision for repeated measures was 1.16 L min−1 (percentage error for repeated measures, 36.0 %). A concordance analysis showed that the concordance rate was 93.1 %. The mean angular bias was −1.8° and the radial limits of agreement were ±37.6°. The difference between the APCO and ICO CO values was 0.04 ± 1.37 L min−1 (percentage error, 42.4 %). And corrected precision for repeated measures was 1.37 L min−1 (percentage error for repeated measures, 42.5 %). The concordance rate was 89.7 %, with a mean angular bias of −3.3° and radial limits of agreement of ±42.2°. This study demonstrated that the trending ability of the esCCO system is not clinically acceptable, as judged by polar plots analysis; however, its trending ability is clinically acceptable based on a concordance analysis, and is comparable with currently available arterial waveform analysis methods.

Keywords

esCCO Cardiac output Pulmonary artery catheter Kidney transplantation Arterial waveform analysis 

Notes

Acknowledgments

We would like to thank Editage (www.editage.com) for English language editing.

Compliance with ethical standards

Conflict of interest

The authors have no conflict of interest to declare.

Informed consent and ethical approval

The present study was approved by the ethics committee of the Toho University Omori Medical Centre (Tokyo, Japan); written informed consent was obtained from the study participants. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Takashi Terada
    • 1
  • Ayano Oiwa
    • 1
  • Yumi Maemura
    • 1
  • Samuna Robert
    • 1
  • Sayaka Kessoku
    • 1
  • Ryoichi Ochiai
    • 1
  1. 1.Department of AnaesthesiologyToho University Omori Medical CentreTokyoJapan

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