Venous spider veins are raised, appear blue or purple, and measure 1-3 millimeters in diameter. Arterial spider veins are flat, appear red or pink, and measure 0.1-1 millimeter in diameter. Spider ...

Arterial duplex is utilized by most centers as a second line of testing. It can identify a significantly elevated velocity in the proximal subclavian artery (i.e., >300 cm/s), as well as a change ...