Volume 69, Issue 4, Pages (February 2006)

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Volume 69, Issue 4, Pages 769-771 (February 2006) Analysis of the optical concentration curve to detect access recirculation L. Mercadal, B. Coevoet, M. Albadawy, S. Hacini, B. Béné, G. Deray, T. Petitclerc Kidney International Volume 69, Issue 4, Pages 769-771 (February 2006) DOI: 10.1038/sj.ki.5000154 Copyright © 2006 International Society of Nephrology Terms and Conditions

Figure 1 Spikes (arrow) of the optical blood volume curve occurring during each step of dialysate conductivity for the measurement of ID. The X-axis is the time scale (h). Scale of the optical blood volume curve is located on the left Y-axis (% of decline). Kidney International 2006 69, 769-771DOI: (10.1038/sj.ki.5000154) Copyright © 2006 International Society of Nephrology Terms and Conditions

Figure 2 Manoeuvre of reversal of the blood lines during a hemodialysis session. There is no recirculation in the normal position of the blood lines with an ID measured at 179 ml/min. Then the lines were reversed, inducing 22% of blood recirculation. In consequence, ID decreased to 136 ml/min. The spike of the optical concentration curve clearly occurred during the measurement of ID in the reversed position of the blood lines. Then the lines were put in the normal position. ID regained its initial value and spikes did not occur. The X-axis is the time scale. The scale of ID is located on the right Y-axis (ml/min). Scale of the optical blood volume curve is located on the left Y-axis (% of decline). Kidney International 2006 69, 769-771DOI: (10.1038/sj.ki.5000154) Copyright © 2006 International Society of Nephrology Terms and Conditions

Figure 3 Manoeuvre of reversal of the blood lines during a hemodialysis session. There is no recirculation in the normal position of the blood lines and 9% in the reversed position of the blood lines. After the inversion of the lines, ID decreased from 180 to 177 ml/min. No spike was detectable in the reversed position. Kidney International 2006 69, 769-771DOI: (10.1038/sj.ki.5000154) Copyright © 2006 International Society of Nephrology Terms and Conditions