Ab1324 covid-19 challenge in the antiphospholipid syndrome – an observational study of a serbian cohort

Background Facing the outburst of the COVID-19 pandemic, we gradually comprehend its pathophysiology as a coagulopathy characterized by increased risks of arterial, venous, and microvascular thrombosis. Antiphospholipid syndrome (APS) is an autoimmune, thrombo-inflammatory disease characterized by thrombosis and/or pregnancy loss in the presence of one or more antiphospholipid antibodies (aPL). Objectives To evaluate the clinical scenario of COVID-19 in the APS population of patients. Methods This is a single-center, observational, cross-sectional study. Data regarding the severity of COVID-19 (severe COVID-19 considered if interstitial pneumonia was diagnosed), COVID-19 vaccinal status, and post-vaccinal reactions (divided into mild, consisting of fever, myalgia, nausea, and severe if thrombosis at any point occurred) were collected from 44 APS patients (21 with primary and 23 with APS associated with systemic lupus erythematosus (SLE), 90.1% female). aPL analysis included the detection of aCL (IgG/IgM), ß2GPI (IgG/IgM), and LA Results were compared to the control group consisting of 31 healthy individuals, with no APS, matched to the APS group regarding age and gender. Results At the moment of COVID-19 infection, 75% of the APS group was taking Aspirin, 15.9% warfarin, 2.3% non-vitamin K oral anticoagulant, 59.1% chloroquine, 31.8% corticosteroid, 2.3% methotrexate. None of the above-mentioned medications were taken from a control group. There was no difference regarding the severity of COVID-19 between APS patients and healthy controls: 84.1% of APS had mild and 15.9% severe COVID-19 (p=0.509, p=0.292 respectively). But the difference regarding the need for hospitalization was significant (none of the healthy controls compared to 11.4% APS patients, p=0.0073). Interestingly, COVID-19 occurred in 72.7% of APS patients before the COVID-19 vaccination compared to 35.5% of healthy controls, p=0.001, conversely, a significantly lower percentage of vaccinated APS patients had COVID-19 compared to healthy controls (34.1% to 71.0%, p=0.002). 27% of APS patients had mild post-vaccinal reactions, none with severe. Conclusion During the COVID-19 pandemic, APS patients in Serbia were at higher risk for hospitalization. However, there was no difference in the severity of clinical presentation compared to non -the APS population. We can only speculate that APS therapy consisting of Aspirin, Chloroquine, and oral anticoagulant therapy contributed to this finding. Moreover, COVID-19 vaccination in the APS population, followed by a low incidence of mild post-vaccinal reactions, had more benefits in protection than in non-APS individuals. REFERENCES: NIL. Acknowledgements: NIL. Disclosure of Interests None Declared.