Study of ulnar and radial arteries at wrist level in smokers.

We aimed to assess the blood flow through the radial and ulnar arteries at the wrist in chronic smokers, after a clinical observation that the ulnar artery is often difficult to palpate in chronic smokers. Sixty-four smokers and 36 non-smokers were recruited. The blood vessels were examined by palpation, and we used the hand-held Doppler and the Allen test to illustrate the dependence of the blood supply on one or the other vessel. The study showed that in 57 of the 64 chronic smokers (89%) the ulnar artery was difficult to palpate and in 28 (44%) dominant and 35 (55%) non-dominant hands blood flow through the ulnar artery was assessed as being poor using the hand-held Doppler. The Allen test was, however, within the normal limit of two seconds in all patients in this study.