Association of Coronary artery Calcification and Thoracic Aortic Calcification with incident peripheral arterial disease in the Multi-Ethnic Study of Atherosclerosis (MESA)
Abstract Aim The association of subclinical atherosclerotic disease in the coronary arteries and thoracic aorta with incident peripheral arterial disease (PAD) is unknown. We investigated the association between coronary artery calcium score (CACs) and thoracic aortic calcium score (TACs) with incident clinical and subclinical PAD. Methods and results The Multi-Ethnic Study of Atherosclerosis (MESA) recruited 6,814 men and women aged 45 to 84 from four ethnic groups who were free of clinical cardiovascular disease at enrollment. CACs and TACs were measured from computed tomography scans. Participants with a baseline ABI≤0.90 or > 1.4 were excluded. Abnormal ABI was defined as ABI≤ 0.9 or > 1.4 at follow up exam. Multivariable logistic regression and Cox proportional hazards models were used to test the associations between baseline CACs and TACs with incident abnormal ABI and clinical PAD respectively. A total of 6,409 participants (female: 52.8%) with a mean age of 61 years were analyzed. Over a median follow up of 16.7 years, 91 participants developed clinical PAD. In multivariable analysis, each unit increase in log (CACS+1) and log (TACs+1) were associated with 23% and 13% (P < 0.01for both) higher risk of incident clinical PAD, respectively. In 5,725 (female:52.6%) participants with an available follow up ABI over median 9.2 years, each 1-unit increase in log (CACs+1) and log (TACs+1) were independently associated with 1.15-fold and 1.07-fold (P < 0.01for both) higher odds of incident abnormal ABI respectively. Conclusions Higher baseline CACs and TACs predict abnormal ABI and clinical PAD independent of traditional cardiovascular risk factor and baseline ABI.