Aortic stenosis and the hemostatic system.

Aortic stenosis (AS) affects more than 10% of the population over 80 years of age and constitutes a major risk factor for heart failure, thromboembolic stroke, and death. A better understanding of the disease, including its interaction with the hemostatic system, is a prerequisite to develop prophylactic treatments. AS pathogenesis is a dynamic process involving endothelial dysfunction, inflammation, fibrosis, and calcification. Several studies support the interplay between the components of the hemostatic system such as platelets, the coagulation system, von Willebrand factor, and extracellular microparticles at each pathophysiological stage of AS. Previous reports have evidenced persistent biological activity of the native valve after transcatheter aortic valve replacement (TAVR) and the subsequent development of microthrombosis that may impact the function of the newly implanted valve. Here, we review the current evidence on the interplay between AS and prothrombotic activity, and we emphasize the clinical consequences of these interactions after aortic valve replacement.