Platelet-Related Biomarkers and Efficacy of Antiplatelet Therapy in Patients with Aortic Stenosis and Coronary Artery Disease.

The objective of this study was to evaluate the serum biomarkers implicated in the interaction of platelets and endothelium, as well as the efficacy of antiplatelet therapy in patients with aortic stenosis (AS) and coronary artery disease (CAD). A total of 78 adult patients with CAD on aspirin therapy participated in this study, including 49 consecutive patients with AS and 29 control subjects. The analysis included the following serum biomarkers: thrombomodulin (TM), platelet factor 4 (PF4), P-selectin, and CD40L. The efficacy of antiplatelet treatment was evaluated using the VerifyNow Aspirin test (ASPI test) and P2Y12 assay test (ADP test). Patients with AS exhibited increased serum levels of TM (7.64 ± 3.5 ng/mL vs. 6.28 ± 2.1 ng/mL, p = 0.011) and PF4 (25.16; Q1: 8.3; Q3: 29.6 μg/mL vs. 12.85; Q1: 5.7; Q3: 14.5 μg/mL, p = 0.021) compared to the control group. P-selectin and CD40L levels did not differ between groups. There were no significant differences in platelet aggregation in the ASPI (474.04 ± 66.7 ARU vs. 471.31 ± 56.2 ARU; p = 0.822) or ADP (224.88 ± 46.4 PRU vs. 216.62 ± 29.6 PRU; p = 0.394) tests. Bleeding incidence did not differ significantly between groups. The coexistence of AS in patients with CAD is associated with elevated levels of the aforementioned biomarkers, which are indicative of endothelial damage and platelet activation. However, the efficacy of antiplatelet treatment was independent of the presence of AS.