ANKLE-ARM BLOOD-PRESSURE INDEX AS A MARKER FOR ATHEROSCLEROTIC VASCULAR DISEASES IN HEMODIALYSIS-PATIENTS

The ankle to arm blood pressure index (AABI) has been recently found t o be a strong predictor of cardiovascular and overall mortality in sev eral populations. The test, which is a noninvasive marker for lower ex tremity vascular disease (when the index is <0.9), is an office proced ure that is simple to perform. The purpose of this study was to evalua te the AABI in hemodialysis patients. One hundred seventy-seven hemodi alysis patients were studied, of which the AABI could be measured in 1 42. The AABI was then compared in patients with and without coronary a rtery disease, cerebrovascular disease, and peripheral vascular diseas e. In patients with or without coronary artery disease, the AABI was, respectively, 0.87 +/- 0.03 and 1.03 +/- 0.02 (P < 0.0001). For cerebr ovascular disease, the mean AABI for patients with or without disease was, respectively, 0.82 +/- 0.04 and 1.00 +/- 0.02 (P < 0.0004). In pa tients with or without peripheral vascular disease, the mean AABI was, respectively, 0.75 +/- 0.04 and 1.02 +/- 0.02 (P < 0.0001). The mean AABI was 0.86 +/- 0.03 in patients with any of the three diseases comp ared with 1.07 +/- 0.02 in patients without any vascular disease (P < 0.0001). Thirty-eight percent of patients had an AABI of less than 0.9 ; 24% were less than 0.8 and 11% were less than 0.7. The mean AABI dec reased as the number of vascular diseases (coronary artery disease, ce rebrovascular disease, or peripheral vascular disease) per patient inc reased (up to two diseases): no disease, 1.07 +/- 0.02; one disease, 0 .92 +/- 0.03; two diseases, 0.78 +/- 0.05; and three diseases, 0.78 +/ - 0.07 (P < 0.05). The absolute magnitude of the AABI correlated with the likelihood of disease. In patients with an AABI of less than 0.7, 93% had overt vascular disease. When the AABI was higher than 1.1, onl y 14% had disease. We have found that as in other populations studied, the AABI serves as a powerful marker for the presence and intensity o f systemic atherosclerotic vascular disease. (C) 1995 by the National Kidney Foundation, Inc.