Five algorithms that calculate cardiac output from the arterial waveform: a comparison with Doppler ultrasound J. Zhang, L.A.H. Critchley, L. Huang

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Five algorithms that calculate cardiac output from the arterial waveform: a comparison with Doppler ultrasound J. Zhang, L.A.H. Critchley, L. Huang British Journal of Anaesthesia Volume 115, Issue 3, Pages 392-402 (September 2015) DOI: 10.1093/bja/aev254 Copyright © 2015 The Author(s) Terms and Conditions

Fig 1 Scatter plots of calibrated supra-sternal Doppler readings (COUS) and the five PPWA algorithms against Oesophageal Doppler (COODM). R2 and slope of the regression lines are indicated. The dashed lines represent are lines of identity (i.e. y=x). British Journal of Anaesthesia 2015 115, 392-402DOI: (10.1093/bja/aev254) Copyright © 2015 The Author(s) Terms and Conditions

Fig 2 Bland-Altman plots of calibrated supra-sternal Doppler reading (cCOUS) and the five PPWA algorithms compared with Oesophageal Doppler (COODM). Bias and limits of agreement are shown by dotted lines. British Journal of Anaesthesia 2015 115, 392-402DOI: (10.1093/bja/aev254) Copyright © 2015 The Author(s) Terms and Conditions

Fig 3 Four-quadrant concordance plots of supra-sternal Doppler reading (COUS) and the five PPWA algorithms compared with oesophageal Doppler (COODM). The central exclusion zone is 15% of mean cardiac output (0.8 litre min−1). British Journal of Anaesthesia 2015 115, 392-402DOI: (10.1093/bja/aev254) Copyright © 2015 The Author(s) Terms and Conditions

Fig 4 Polar half-moon plots of supra-sternal Doppler reading and the five PPWA algorithm readings compared with Oesophageal Doppler. Tramlines (pink) and radial limits of agreement (RLOA: green) have been added to show extent of data spread. Polar analysis data after exclusion of central lying data (i.e. exclusion zones set at <0.5 litre min−1) is provided in lower right hand corner of each plot. British Journal of Anaesthesia 2015 115, 392-402DOI: (10.1093/bja/aev254) Copyright © 2015 The Author(s) Terms and Conditions