Background: On the basis of the Heinz Nixdorf RECALL Study (HNR) we estimated the impact of classical atherosclerotic risk factors on different ankle-brachial-index (ABI) criteria.
Patients and methods: In a subgroup of participants (n = 2586) who had normal ABI at baseline ABI measurement was repeated at a 5 years follow-up and 3 different ABIs were defined: "ABI-high" calculated from the higher pressure, "ABI-low" from the lower pressure of both foot arteries of each leg. "Pure-ABI-low" was defined by exclusion of participants with ABI-high from those with ABI-low. Mönckebergs mediacalcinosis (MC) was accepted in case of ABI-high > 1.4 in one leg.
Results: According to ABI-high 2 %, to ABI-low 7.8 % and pure-ABI-low 5.8 % of the participants developed peripheral arterial disease (PAD) (ABI < 0.9) and 3.6 % developed MC within the 5 years. Age did not play any role whereas female gender, diabetes mellitus and smoking were associated with an increased relative risk of pathologic ABI-high and ABI-low. Looking at the pure-ABI-low group only, female gender and smoking showed significant associations. None of the analysed risk factors except gender had an impact on the development of MC.
Conclusions: Classical risk factors have different impact on incidence of PAD as defined by different ABI criteria.