SELP and Paroxysmal atrial fibrillation: Results Patients with AF have similar total GPVI surface expression (p = 0.58) and P-selectin exposure (p = 0.73) on their platelets compared with noAF patients but demonstrate significantly higher GPVI-dimer expression (p = 0.02).Patients with paroxysmal AF express similar GPVI-dimer levels compared with permanent AF and GPVI-dimer levels were not different between anticoagulated groups.