Comparison of cardiac output measurement using the CardioQP oesophageal Doppler with cardiac output measurement using thermodilution technique in children during heart catheterisation |
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Authors: | Working Group on Non-invasive Haemodynamic Monitoring in Paediatrics Knirsch W Kretschmar O Tomaske M Stutz K Nagdyman N Balmer C Schmitz A Berger F Bauersfeld U Weiss M |
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Affiliation: | 1. Division of Paediatric Cardiology;2. Contributed equally as first authors.;3. Department of Anaesthesia, University Children’s Hospital, Steinwiesstrasse 75, 8032‐Zurich, Switzerland;4. Department of Congenital Heart Disease, German Heart Centre Berlin, Augustenburger Platz 1, 13353 Berlin, Germany;5. Department of Anaesthesia, University Children’s Hospital, Steinwiesstrasse 75, 8032‐Zurich, Switzerland |
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Abstract: | The minimally invasive CardioQP oesophageal Doppler probe estimates cardiac output by measuring blood flow velocity in the descending aorta. Individual variables to enter are patient's age, weight and height. We measured cardiac output simultaneously with CardioQP and pulmonary artery catheter thermodilution techniques during heart catheterisation in 40 paediatric patients with congenital heart defects. Median [range] age was 8.2 years [0.5-16.7 years], cardiac output values measured by thermodilution and CardioQP were 3.6 l.min(-1) [1.2-7.1 l.min(-1)] and 3.0 l.min(-1) [0.7-6.7 l.min(-1)], respectively. These values showed only moderate correlation (r = 0.809; p < 0.0001). Bias and precision were 0.66 l.min(-1) and 1.79 l.min(-1) (95% limits of agreement: -1.13 to +2.45 l.min(-1)). Based on our preliminary experience, cardiac output values measured by CardioQP in children do not reliably represent cardiac output values compared with the thermodilution technique. We suggest measurement of individual aortic diameter to improve performance of the CardioQP. |
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