1. Photoplethysmography in the assessment of venous insufficiency
A.N. Nicolaides, M.S., F.R.C.S., F.R.C.S.E., C. Miles, M.B., B.S., F.R.A.C.S. * 
Journal of Vascular Surgery 
Volume 5, Issue 3, Pages (March 1987)
DOI: / (87)
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

2. Fig. 1
Simultaneous photoplethysmographic (a) and venous pressure (b) recordings obtained in the standing position. Method of calculating 90% recovery time is shown (AVP = ambulatory venous pressure).
Journal of Vascular Surgery 1987 5, DOI: ( / (87) )
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

3. Fig. 2
Relationship between photoplethysmographic refilling time (P.P.G.-R.T.) and the venous pressure refilling time (V.P.-R.T.) obtained simultaneously in the standing position.
Journal of Vascular Surgery 1987 5, DOI: ( / (87) )
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

4. Fig. 3
Relationship between photoplethysmographic refilling time (P.P.G.-R.T.) and the venous pressure refilling time (V.P.-R.T.) obtained simultaneously in the sitting position.
Journal of Vascular Surgery 1987 5, DOI: ( / (87) )
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

5. Fig. 4
Relationship between photoplethysmographic refilling time (P.P.G.-R.T.) and mean ambulatory venous pressure obtained in the standing position with the cuff deflated (closed circles = normal limb; triangles = superficial venous incompetence only; open circles = deep venous incompetence).
Journal of Vascular Surgery 1987 5, DOI: ( / (87) )
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

6. Fig. 5
Relationship between photoplethysmographic refilling time (P.P.G.-R.T.) and mean ambulatory venous pressure obtained in the standing position with cuff inflated (triangles = superficial venous incompetence only; open circles = deep venous incompetence). Normal limbs are not shown; the inflated cuff did not alter their position as shown in Fig. 4.
Journal of Vascular Surgery 1987 5, DOI: ( / (87) )
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

7. Fig. 6
Median and 95% tolerance levels of the photoplethysmographic refilling time (P.P.G.-R.T.) in the three groups of limbs studied in the standing position. Interrupted lines represent the 95% tolerance levels of the PPG-RT when ankle cuff was inflated. S.V.I. = superficial venous insufficiency; D.V.I. = deep venous insufficiency.
Journal of Vascular Surgery 1987 5, DOI: ( / (87) )
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

8. Fig. 7
Median and 95% tolerance levels of the photoplethysmographic refilling time (P.P.G.-R.T.) in three groups studied in the sitting position. Interrupted lines represent the 95% tolerance levels of the PPG-RT when ankle cuff was inflated.
Journal of Vascular Surgery 1987 5, DOI: ( / (87) )
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

9. Fig. 8
Diagnostic flow chart indicates procedure followed for screening of patients with suspected chronic venous problems.
Journal of Vascular Surgery 1987 5, DOI: ( / (87) )
Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions