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BJA Advance Access originally published online on February 27, 2008
British Journal of Anaesthesia 2008 100(4):517-520; doi:10.1093/bja/aen024
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© The Board of Management and Trustees of the British Journal of Anaesthesia 2008. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Cardiac output measurement in children: comparison of Aesculon® cardiac output monitor and thermodilution

M. Tomaske1,*, W. Knirsch1, O. Kretschmar1, K. Woitzek1,2, C. Balmer1, A. Schmitz2, U. Bauersfeld1, M. Weiss on behalf of the Working Group on Non-invasive Haemodynamic Monitoring in Paediatrics2

1 Division of Paediatric Cardiology
2 Department of Anaesthesia, University Children’s Hospital, Steinwiesstrasse 75, CH-8032 Zurich, Switzerland

* Corresponding author. E-mail: maren.tomaske{at}kispi.uzh.ch

Background: We compared cardiac output (CO) measurements by the non-invasive electrical velocimetry (Aesculon®) monitor with the pulmonary artery catheter (PAC) thermodilution method in children.

Methods: CO values using the Aesculon® monitor and PAC thermodilution were simultaneously recorded during cardiac catheterization in children. Measurements were performed under general anaesthesia. To compare, three consecutive measurements for each patient within 3 min were obtained. The means of the three values were compared using simple regression and Bland–Altman analysis. Data were presented as mean (SD). A mean percentage of <30% was defined to indicate clinical useful reliability of the Aesculon® monitor.

Results: A total of 50 patients with a median (range) age of 7.5 (0.5–16.5) yr were enrolled in the study. Mean CO values were 3.7 (1.5) litre min–1 (PAC thermodilution) and 3.1 (1.7) litre min–1 (Aesculon® monitor). Analysis for CO measurement showed a good correlation between the two methods (r=0.894; P<0.0001). The bias between the two methods was 0.66 litre min–1 with a precision of 1.49 litre min–1. The mean percentage error for CO measurements was 48.9% for the Aesculon® monitor when compared with PAC thermodilution.

Conclusions: Electrical velocimetry using the Aesculon® monitor did not provide reliable CO values when compared with PAC thermodilution. Whether the Aesculon® monitor can be used as a CO trend monitor has to be assessed by further investigations in patients with changing haemodynamics.

Keywords: cardiovascular system, responses; children; monitoring


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