Color flow Doppler: imaging the upper extremity.

Dynamic values of key vessel diameter, blood velocity, and flow rate in the upper extremity were obtained in 20 healthy volunteers by means of color flow Doppler imaging with a 7.5 MHz transducer. Recordings were made of the brachial, radial, posterior radial recurrent, ulnar, and digital arteries. Radial and ulnar vessels were evaluated at both wrist and midcarpal levels. Diameter and velocity changes were followed throughout the cardiac cycle, and a true mean flow was computed. Mean diameters of the digital vessels ranged from 0.9 mm in the small finger to 1.3 mm in the thumb. Brachial flows ranged from 4.6 to 89.9 ml/min, radial flows from 0.9 to 15.3 ml/min, and ulnar flows from 0.6 to 79.9 ml/min. At the midcarpal level, flows ranged from 0.2 to 68.4 ml/min for the ulnar artery and from 0.8 to 42.9 ml/min for the radial artery. Variability between individuals was also demonstrated in artery dominance: eleven ulnar dominant, seven radial dominant, and two equal (within 25% of each other). The accuracy and ease of use of this technique in measurement of vessels are limited when vessels are less than 1.5 mm in diameter although the technique provides quantitative values to 0.5 mm.