1. Digital blood flow after radial artery harvest for coronary artery bypass grafting 
Hyun-Sung Lee, MD, Byung-Chul Chang, MD, Youn Jeong Heo, RN 
The Annals of Thoracic Surgery 
Volume 77, Issue 6, Pages (June 2004)
DOI: /j.athoracsur

2. Fig 1
Types of wave forms recorded by pulse volume recording plethysmography. Normal: characterized by rapid systolic up-slope, a sharp systolic peak, and a diastolic down-slope with a dicrotic wave. Absence of reflected wave: a rapid ascending limb, an anacrotic notch, and a dicrotic notch high on the down-slope. Blunted: a delayed up-slope, a rounded peak, and a convex down-slope that bows away from the baseline.
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )

3. Fig 2
Distribution of the three wave forms among the fingers of the operated on and control arms. Digital pulse wave forms were classified into normal, absent reflected wave, and blunted types. (C = control arms; Op = operated arms; RWA = absence of reflected wave; 1 = first finger; 2 = second finger, 3 = third finger; 4 = fourth finger; 5 = fifth finger.)
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )

4. Fig 3
Comparison of digital pulse amplitudes between operated and nonoperated arms. (C = control arms; Op = operated arms; 1 = first finger; 2 = second finger, 3 = third finger; 4 = fourth finger; 5 = fifth finger.)
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )