Lipoprotein-associated phospholipase A2 and risk of incident peripheral arterial disease in a multi-ethnic cohort: The Multi-Ethnic Study of Atherosclerosis

Prospective studies supporting a relationship between elevated lipoprotein-associated phospholipase A(2) (Lp-PLA(2)) and incident peripheral arterial disease (PAD) are limited. We evaluated the association of Lp-PLA(2) with incident PAD in a multi-ethnic cohort without clinical cardiovascular disease. A total of 4622 participants with measurement of Lp-PLA(2) mass and Lp-PLA(2) activity and an ankle-brachial index (ABI) between 0.9 and 1.4 were followed for the development of PAD (median follow-up = 9.3 years), defined as an ABI 0.9 and decline from baseline 0.15. There were 158 incident PAD events during follow-up. In adjusted logistic regression models, each higher standard deviation of both Lp-PLA(2) activity and mass did not confer an increased risk of developing PAD [odds ratios, (95% confidence intervals)]: 0.92 (0.66-1.27) for Lp-PLA(2) activity and 1.06 (0.85-1.34) for mass. Additionally, no significant interaction was found according to ethnicity: p=0.43 for Lp-PLA(2) activity and p=0.55 for Lp-PLA(2) mass. We found no evidence of an association between Lp-PLA(2) and incident PAD.