Evaluating Post-discharge Thromboembolic Events in Patients With COVID-19

Background: COVID-19 is associated with a high rate of thromboembolic events in hospitalized patients, but it is unclear whether this risk remains high after discharge. This study aimed to evaluate the association of underlying factors with post-discharge thrombolytic events in COVID-19 patients and the association of thrombolytic events with subsequent mortality and ischemic heart disease. Methods: In this study, eligible patients with COVID-19 who were admitted to the respiratory ward of Loghman Hakim Hospital, Tehran, Iran, followed up for about 3 months after discharge to record any thromboembolic events. Patients who reported postdischarge thromboembolic events were confirmed based on their diagnostic tests. The Chi-square test was used to evaluate the association between thromboembolic events and qualitative parameters, and an independent t-test was used to evaluate their association with quantitative parameters. Logistic regression analysis was performed to assess the association between independent variables and the composite outcome. Results: Thromboembolic events were diagnosed in 35 patients (5.04%), including Myocardial Infarction (MI) in 17 patients (2.44%), venous thromboembolism in 10 patients (1.44%), and ischemic stroke in 8 patients (1.15%). None of the 26 patients who received thromboprophylaxis had thromboembolic events. During follow-up, 22 patients (3.17%) died, of whom, 10 patients (43.47%) had thromboembolic events. Thromboembolic events were not associated with sedentary life and oxygen (O2) dependency after discharge (P value of 0.40 and 0.098, respectively). Regression analyses showed that thromboembolic events were significantly associated with ischemic heart disease and mortality (P=0.007 and P<0.001, respectively). Conclusion: Our findings support a high rate of post-hospitalization thromboembolic events in COVID-19 patients; however, it needs more large-scale trials.