Identification of Ischemic Stroke Patients Based on Plasma Concentrations of Extracellular Vesicles.

Patients presenting with stroke symptoms suffer from either ischemic stroke, hemorrhagic stroke, transient ischemic attacks (TIA), or "stroke mimics," which include benign headaches, epilepsy, and vestibular disorders. As ischemic and hemorrhagic stroke patients require different medical treatments, early identification of the underlying cause of symptoms is essential for tailored and urgent medical intervention. This study investigates whether extracellular vesicles (EVs), present in peripheral blood of patients presenting with stroke symptoms, can be used to identify patients with ischemic stroke. Blood was collected from 155 patients presenting with stroke symptoms in the emergency room and analyzed for EVs by flow cytometry (ethics approval number NL72929.018.20). The primary endpoint was to compare platelet EV concentrations between patients with (n = 66) and without (n = 89) ischemic stroke. Concentrations of EVs from both activated platelets and leukocytes were lower in patients presenting with ischemic stroke compared to other patients (p = 0.038 and p = 0.015, respectively). No significant differences in other EV types were observed. In addition, ischemic stroke patients were older and had a higher diastolic blood pressure compared to patients with other diagnoses. In a multivariable analysis, leukocyte EVs and diastolic blood pressure were independent indicators of ischemic stroke. To conclude, this study demonstrates that the plasma concentration of leukocyte EVs can be useful to identify ischemic stroke patients in an emergency setting.