Jurgen C. de Graaff, MDa, Dirk Th. Ubbink, MD, PhDa, Dink A

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The usefulness of a laser Doppler in the measurement of toe blood pressures Jurgen C. de Graaff, MDa, Dirk Th. Ubbink, MD, PhDa, Dink A. Legemate, PhD, MDa, Rob J. de Haan, PhDb, Michael J.H.M. Jacobs, MD, PhDa Journal of Vascular Surgery Volume 32, Issue 6, Pages 1172-1179 (December 2000) DOI: 10.1067/mva.2000.108009 Copyright © 2000 Society for Vascular Surgery and The American Association for Vascular Surgery, a Chapter of the International Society for Cardiovascular Surgery Terms and Conditions

Fig. 1 Scheme of probe application on the big toe and signal analysis. All three signals are plotted in one graph for simplification, although signals were analyzed independently. The arrows represent the points at which the systolic pressures were read. Journal of Vascular Surgery 2000 32, 1172-1179DOI: (10.1067/mva.2000.108009) Copyright © 2000 Society for Vascular Surgery and The American Association for Vascular Surgery, a Chapter of the International Society for Cardiovascular Surgery Terms and Conditions

Fig. 2 Difference between pressure measured with PPG and with the LD setting that detects slow changes in the blood flow (LD3) (A) and the LD setting that could trace heartbeats (LD0.03) (B) plotted against the mean pressure. The regression line of the differences (drawn line ) and 95% limits of agreement (dotted lines ) of the differences are presented as horizontal lines. The open squares represent the pressures that can only be measured with LD. Journal of Vascular Surgery 2000 32, 1172-1179DOI: (10.1067/mva.2000.108009) Copyright © 2000 Society for Vascular Surgery and The American Association for Vascular Surgery, a Chapter of the International Society for Cardiovascular Surgery Terms and Conditions

Fig. 3 Difference between LD3 pressure and LD0.03 pressure at the first measurement plotted against the mean of both methods. The regression line of the differences (drawn line ) and 95% limits of agreement (dotted lines ) of the differences are presented as horizontal lines. The vertical dashed line represents the commonly accepted cutoff value for critical leg ischemia (< 30 mm Hg). The open squares represent the pressures that could only be measured with LD. Journal of Vascular Surgery 2000 32, 1172-1179DOI: (10.1067/mva.2000.108009) Copyright © 2000 Society for Vascular Surgery and The American Association for Vascular Surgery, a Chapter of the International Society for Cardiovascular Surgery Terms and Conditions

Fig. 4 Difference between the first and second measurement of PPG pressure (A), LD3 pressure (B), and LD0.03 pressure (C) plotted against the mean of the first and second measurement. The regression line of the differences (drawn line ) and 95% limits of agreement (dotted lines ) of the differences are presented as horizontal lines. Journal of Vascular Surgery 2000 32, 1172-1179DOI: (10.1067/mva.2000.108009) Copyright © 2000 Society for Vascular Surgery and The American Association for Vascular Surgery, a Chapter of the International Society for Cardiovascular Surgery Terms and Conditions