Risk Factors and Characteristics of Ischemic Stroke in Patients with Immune Thrombocytopenia: A Retrospective Cohort Study.

Objectives: Previous research has found that patients with immune thrombocytope-nia (ITP) have an increased risk of thrombosis, such as venous thromboembolism (VT), ischemic stroke (IS)/transient ischemic attack (TIA), and cardiovascular dis-ease (CVD), but the risk factors for stroke in patients with ITP have yet to be deter-mined. This study aims to determine the risk factors and characteristics of ischemic stroke in patients with ITP. Materials and methods: This study included adults with incident primary ITP diagnosed in a tertiary medical center between 2010 and 2020. The t-test and Mann-Whitney U test were used to compare the variables between IS and non-IS groups, and the multivariate logistic regression model was employed to evaluate correlations. Results: The study enrolled 1824 individuals, of whom 17 (0.93%) had IS, and 138 (1:8) were randomly chosen from 1807 non-IS patients. Age was found to be substantially associated with stroke in the multivariate analysis (OR 1.07, 95% CI: 1.026-1.116; p = 0.001). We found no correlation between platelet counts (PLT) (OR 1.013, 95% CI: 0.995-1.033; p = 0.164), mean platelet volume (MPV), platelet larger cell ratio (P-LCR), prothrombin time (PT) (OR 1.455, 95% CI 0.979-2.164; p = 0.064), activated partial thromboplastin time (APTT), D-dimer, fibrinogen or antinuclear antibody (ANA) and stroke. Of 17 ITP-IS patients, 7 (53.8%) were cryptogenic, greater than the general IS population. Three (23.1%) of them had an embolic pattern. Conclusion: For ITP patients, age was a significant pre-dictor of stroke. ITP-IS patients had a more cryptogenic origin, with some showing an embolic pattern.