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Volume 3 Supplement 1

ESICM LIVES 2015

  • Poster presentation
  • Open Access

Accuracy of an automatic analysis software to detect microvascular density parameters

  • 1, 2,
  • 1, 2,
  • 2, 3,
  • 2,
  • 1,
  • 2, 3 and
  • 2, 3
Intensive Care Medicine Experimental20153 (Suppl 1) :A415

https://doi.org/10.1186/2197-425X-3-S1-A415

  • Published:

Keywords

  • Clinical Practice
  • Quality Score2
  • Skilled Operator
  • Wide Limit
  • Automatic Software

Introduction

Analysis of microvascular density parameters is time consuming and operator-dependent.1 This is the main limitation to use microvascular monitoring in clinical practice as a “point-of-care” tool. Recently, an automatic analysis software has been developed and could allow us to obtain results quickly.

Objectives

The aim of this study was to assess the accuracy of microvascular density parameters (total vessel density (TVD), perfused vessel density (PVD) and proportion of perfused vessels (PPV)) obtained by the new automatic analysis software CytoCamTools 1.7.12 (CC) (Braedius, Amsterdam, The Netherlands) in comparison with Automated Vascular Analysis (AVA) software 3.2 (MicroVision Medical, Amsterdam, The Netherlands).

Methods

Sublingual microcirculatory videos were obtained using an incidence dark field-imaging device (CytoCam, Braedius, Amsterdam, The Netherlands). Only videos with a high quality score2 were selected for the analysis. Each video was analysed using AVA 3.2 by two skilled operators and results were compared with the analysis obtained by the CytoCamTools 1.7.12 software. Bland-Altman analysis was used to look at the agreement between the automatic software and the operators.

Results

84 videos from 22 patients after cardiac surgery were analysed. The mean bias between TVD-CC and TVD-AVA was 2.17 mm/mm^2 (95% CI 1.44 to 2.90; p = 0.0001) with limits of agreement (LOA) of -4.41 (95% CI -5.66 to -3.16) and 8.76 (95% CI 7.50 to 10.01) mm/mm^2 (Figure 1). The mean bias between PVD-CC and PVD-AVA was 6.54 mm/mm^2 (95% CI 5.67 to 7.42; p < 0.0001) with LOA of -1.37 (95% CI -2.87 to 0.13) and 14.46 (95% CI 12.95 to 15.96) mm/mm^2 (Figure 2). A good correlation was found between the average of PPV-CC and PPV-AVA and the difference of the two measurements where ΔPPV = -1.85(mean PPV) +181 (R=-0.94, (95%CI -0.96 to -0.91; p < 0.0001).
Figure 1
Figure 1

Bland-Altman between TVD-AVA and TVD-CC.

Figure 2
Figure 2

Bland-Altman between PVD-AVA and PVD-CC.

Conclusions

This study shows acceptable bias but wide limits of agreement for the comparison of TVD, PVD and PPV between the automated CC system and skilled operators. Further software improvements may be needed before real time point of care testing of the microcirculation can be used at the bedside.

Authors’ Affiliations

(1)
Department of Biomedical Sciences and Public Health, Università Politecnica delle Marche, Ancona, Italy
(2)
Department of Intensive Care Medicine, St George's University Hospitals NHS Foundation Trust, London, United Kingdom
(3)
St George's University of London, London, United Kingdom

References

  1. De Backer D, Hollenberg S, Boerma C, Goedhart P, Büchele G, Ospina-Tascon G, et al: How to evaluate the microcirculation: report of a round table conference. Crit Care. 2007, 11 (5): R101-10.1186/cc6118.PubMedPubMed CentralView ArticleGoogle Scholar
  2. Massey MJ, Larochelle E, Najarro G, Karmacharla A, Arnold R, Trzeciak S, et al: The microcirculation image quality score: development and preliminary evaluation of a proposed approach to grading quality of image acquisition for bedside videomicroscopy. J Crit Care. 2013, 28 (6): 913-917. 10.1016/j.jcrc.2013.06.015.PubMedView ArticleGoogle Scholar

Copyright

© Carsetti et al.; 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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