Accuracy of non-invasive measurement of haemoglobin concentration by pulse co- oximetry during steady-state and dynamic conditions in liver surgery J.J.

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Presentation transcript:

Accuracy of non-invasive measurement of haemoglobin concentration by pulse co- oximetry during steady-state and dynamic conditions in liver surgery J.J. Vos, A.F. Kalmar, M.M.R.F. Struys, R.J. Porte, J.K.G. Wietasch, T.W.L. Scheeren, H.G.D. Hendriks British Journal of Anaesthesia Volume 109, Issue 4, Pages 522-528 (October 2012) DOI: 10.1093/bja/aes234 Copyright © 2012 The Author(s) Terms and Conditions

Fig 1 CONSORT flow diagram. British Journal of Anaesthesia 2012 109, 522-528DOI: (10.1093/bja/aes234) Copyright © 2012 The Author(s) Terms and Conditions

Fig 2 Scatter plot of Hbsatlab and SpHb values. Data are shown for data points in the steady-state phase (blue filled circles) and the dynamic phase (green empty circles). British Journal of Anaesthesia 2012 109, 522-528DOI: (10.1093/bja/aes234) Copyright © 2012 The Author(s) Terms and Conditions

Fig 3 Corrected Bland–Altman plots for repeated measurements during the steady-state phase (a) and the dynamic phase (b). British Journal of Anaesthesia 2012 109, 522-528DOI: (10.1093/bja/aes234) Copyright © 2012 The Author(s) Terms and Conditions

Fig 4 Plot of directional changes (delta values) in SpHb (y-axis) and Hbsatlab (x-axis) values between consecutive measurements in the steady-state and dynamic phases. Blue filled circles are directional changes for absolute Hbsatlab values >10 g dl−1, green empty circles for absolute Hbsatlab values <10 g dl−1. Data points within the pink box are below the threshold delta value of 1.0 g dl−1. British Journal of Anaesthesia 2012 109, 522-528DOI: (10.1093/bja/aes234) Copyright © 2012 The Author(s) Terms and Conditions

Fig 5 Coefficient of determination (R2) values between the corresponding SpHb and Hbsatlab values in the dynamic phase for subjects receiving crystalloid (blue solid line) or colloid (green solid line) infusion. The corresponding Hbsatlab values are also shown for both groups (dashed lines). British Journal of Anaesthesia 2012 109, 522-528DOI: (10.1093/bja/aes234) Copyright © 2012 The Author(s) Terms and Conditions