C. Bergek, J.H. Zdolsek, R.G. Hahn British Journal of Anaesthesia

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Non-invasive blood haemoglobin and plethysmographic variability index during brachial plexus block† C. Bergek, J.H. Zdolsek, R.G. Hahn British Journal of Anaesthesia Volume 114, Issue 5, Pages 812-817 (May 2015) DOI: 10.1093/bja/aeu484 Copyright © 2015 The Author(s) Terms and Conditions

Fig 1 Haemoglobin concentration measured by pulse oximetry and blood sampling (a), plethysmographic variability index (b), and perfusion index (c) during brachial plexus block, which was initiated at time zero. Data represent simultaneous recordings from 20 patients. British Journal of Anaesthesia 2015 114, 812-817DOI: (10.1093/bja/aeu484) Copyright © 2015 The Author(s) Terms and Conditions

Fig 2 Bland–Altman plots comparing the haemoglobin concentration (SpHb) for the blocked (left) and the non-blocked arm (right) with the invasive control (Hb) after initiation of the brachial plexus block. Each circle represents the mean value of SpHb and Hb at 10, 15, and 20 min in a single patient. British Journal of Anaesthesia 2015 114, 812-817DOI: (10.1093/bja/aeu484) Copyright © 2015 The Author(s) Terms and Conditions