Risk Factors for Suboptimal Utilization of Statins and Antiplatelet Therapy in Patients Undergoing Revascularization for Symptomatic Peripheral Arterial Disease

Abstract

The objective of this study was to identify risk factors for suboptimal medical therapy (defined as reported antiplatelet and statin use) among patients undergoing lower extremity bypass (LEB) and peripheral vascular interventions (PVIs) for symptomatic peripheral arterial disease (PAD). The Vascular Study Group of Greater New York (VSGGNY) database was used to identify all patients undergoing PVI or LEB for PAD (2011-2013). Bivariate analyses were performed to identify characteristics of patients who were not prescribed statins and/or antiplatelet agents before revascularization. Multivariate relative risk regression models were developed to identify patients at risk for suboptimal therapy, with regards to antiplatelet and statin therapy. About 1,030 patients underwent endovascular therapy (n=822; 80%) or surgical bypass (n=208; 20%) for symptomatic PAD (57.2% claudication; 15% rest pain and 27.8% tissue loss). Overall, preoperative statin use was observed in 59%. Preoperative antiplatelet therapy was observed in 79% of patients. Bivariate analysis revealed comparatively reduced statin use among patients without other cardiovascular risk factors including hypertension (63% vs. 39.3%; P<0.0001) and coronary artery disease (CAD) with or without prior cardiac revascularization (coronary artery bypass grafting [CABG]/percutaneous coronary intervention [PCI]; 75.2% vs. 47.4%; P<0.0001). Multivariate relative risk regression confirmed higher rates of statin use among patients with other cardiovascular risk factors including hypertension (1.14 [1.02-1.27]; P=0.02) and CAD with prior CABG/PCI (1.22 [1.13-1.31]; P<0.0001). Reduced statin use was observed in patients over 80years old. (0.92 [0.84-0.1.0]; P=0.059). By multivariate regression, antiplatelet therapy use was associated with CAD and/or prior CABG/PCI (1.11 [1.04-1.17]; P=0.0015) and prior peripheral revascularization (1.07 [1.01-1.13]; P=0.03). Patients with symptomatic PAD, but without an antecedent cardiovascular history, are less likely to be optimally managed with statins and antiplatelet therapy preoperatively. Given the established role of these medications in the optimal medical management of patients with PAD, this presents an opportunity for improvement in the overallvascular care of patients undergoing intervention for symptomatic PAD at VSGGNY centers.