Background and Aim: COVID-19 infection is associated with increased thromboembolic events. The aim of our study was to investigate the frequency of in-hospital thromboembolic events in patients with COVID-19 and to investigate the effect of blood parameters taken at the time of diagnosis on the development of thromboembolic events.

Methods: The demographic data, the frequency of thromboembolic events and the blood parameters at the time of diagnosis of the patients were recorded.

Results: A total of 2323 patients, 1136 women (48.9%) and 1187 men (51.1%) were included in the study.Thromboembolic events were observed in 103 (4.4%) patients during hospitalisation. DVT occurred in 4 patients (0.2%), PTE in 3 patients (0.15%), peripheral arterial disease in 4 patients (0.2%), cerebrovascular event in 17 patients (0.7%), mesenteric ischaemia in 1 patient (0.05%) and MI in 74 patients (3.2%).Thromboembolic events were significantly higher in patients with HT (p=0.03), heart failure (p=0.023), chronic kidney disease (p=0.017) and COPD (p=0.035) compared to those without. The age of patients with thromboembolic events was significantly higher than that of patients without thromboembolic events (p=0.003). Among laboratory parameters, hemoglobin was significantly lower (p=0.002) and mean platelet volume (MPV) was significantly higher (p=0.009) in patients with thromboembolic events. In multiple regression analysis, the risk factors associated with thromboembolic events were age (OR: 0.44, 95% CI: 0.0 - 0.001; p=0.045), hemoglobin (OR: -0.46, 95% CI: -0.09 - 0.00; p=0.036) and MPV (OR: 0.05, 95% CI: 0.001 - 0.015; p=0.018).
Conclusions: Advanced age is a risk factor for thromboembolic events in COVID-19 patients. It is thought that hemoglobin and MPV at admission may also contribute to the prediction of thromboembolic events.