1. The correlation between three methods of skin perfusion pressure measurement: Radionuclide washout, laser Doppler flow, and photoplethysmography 
Leopoldo Malvezzi, MD, John J. Castronuovo, MD, Lawrence C. Swayne, MD, David Cone, BA, Jessie Z. Trivino, MS 
Journal of Vascular Surgery 
Volume 15, Issue 5, Pages (May 1992)
DOI: / (92)90717-M
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

2. Fig. 1
Graph shows gamma radiation emission over time with respect to decreasing counterpressure. Skin perfusion pressure was calculated at 100 mm Hg, the pressure at which it was estimated that clearance of the radionuclide began.
Journal of Vascular Surgery  , DOI: ( / (92)90717-M)
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

3. Fig. 2
Graph shows gamma radiation emission over time with respect to increasing counterpressure. Skin perfusion pressure was calculated as 80 mm Hg, the pressure at which it was estimated that clearance of the radionuclide ceased.
Journal of Vascular Surgery  , DOI: ( / (92)90717-M)
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

4. Fig. 3
Dual trace chart record of laser Doppler flow (lower tracing) and bladder pressure (upper tracing). Stepwise deflation of the cuff from 50 to 40 mm Hg resulted in initiation of microcirculatory flow.
Journal of Vascular Surgery  , DOI: ( / (92)90717-M)
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

5. Fig. 4
Linear regression analysis of skin perfusion pressure values obtained by laser Doppler and those obtained by 99m Tc radionuclide washout [r = 0.991].
Journal of Vascular Surgery  , DOI: ( / (92)90717-M)
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

6. Fig. 5
Transparent polyvinylchloride plastic bladder with laser Doppler and PPG probes inserted.
Journal of Vascular Surgery  , DOI: ( / (92)90717-M)
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

7. Fig. 6
Experimental set-up for simultaneous measurement of the SPP: gamma detector to the left, laser Doppler and PPG apparatus to the right.
Journal of Vascular Surgery  , DOI: ( / (92)90717-M)
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions