IgG-RBD Response Due to Inactivated SARS-CoV-2 Vaccine: Alteration in D-Dimer and Fibrinogen Concentrations, Association with Comorbidities and Adverse Effects.

OBJECTIVE: To examine the immunoglobulin G-receptor-binding domain (IgG-RBD) response and changes in fibrinogen and D-dimer concentrations in individuals with a past coronavirus infection and followed by CoronaVac. METHODS: The study consisted of a total of 116 participants. Blood samples were drawn from subjects 21-25 days after they received first and second doses of CoronaVac as well as from individuals with a past infection. Fibrinogen, D-dimer, and IgG-RBD concentrations were measured. RESULTS: The IgG concentrations of the vaccinated subjects were significantly higher (P < .001), fibrinogen levels were lower (P < .001), and D-dimer levels increased following the second vaccination compared with the first vaccination (P = .083). No difference was obtained in IgG-RBD between vaccinated and previously infected individuals (P = .063). The differences in fibrinogen and D-dimer were statistically nonsignificant between both groups. CONCLUSION: The CoronaVac vaccine appears to be safe and effective. It is essential for individuals to take personal protective measures, such as using masks and distancing.

Would Tracking Coagulation Together with Inflamation Markers be a Prospect for COVID-19 Disease Prognosis?

BACKGROUND: The purpose of this study is to evaluate the prognostic roles of hemostatic tests including prothrombin time (PT), activated partial thromboplastin time (aPTT), fibrinogen, D-dimer, and antithrombin III in the progression of disease, monitorization of severe, mild and moderate cases, and also to show their relationship with inflammatory markers including C-reactive protein (CRP), procalcitonin, and interleukin-6 (IL-6). METHODS: The study comprised 604 patients (360 men and 244 women) with confirmed SARS-CoV-2 infection admitted to Emergency Department of Istanbul Faculty of Medicine between March 15 and April 15, 2020. The variations in the concentration of coagulation tests and inflammatory markers were observed from the admission to hospital to the 10th day with three-day periods. RESULTS: PT level and PT activity of severe cases were significantly different compared to mild cases (p = 0.012, p = 0.010, respectively). Similarly, aPTT and D-dimer levels in severe cases were significantly higher compared to the mild cases. However, fibrinogen levels of mild cases were significantly lower compared to either moderate or severe cases (p < 0.001, for both). The PT, PT activity, aPTT, and D-Dimer levels in severe cases were significantly different compared with the mild cases. However, fibrinogen level was the highest in severe cases, and higher than either mild or moderate cases. CONCLUSIONS: Our findings reveal the vital importance of measuring coagulation parameters at the time of admission and monitoring them at regular intervals in clinical monitoring of COVID-19 patients, in determining the severity of the disease in terms of the patient's prognosis, and in choosing and applying the appropriate treatment at the right time.

Serum Endocan Levels on Admission Are Associated With Worse Clinical Outcomes in COVID-19 Patients: A Pilot Study.

Thrombotic and embolic complications in the cardiovascular system are evident and associated with worse prognosis in coronavirus disease 2019 (COVID-19) patients. Endothelial-specific molecule 1 (endocan) plays a role in vascular pathology. We hypothesized serum endocan levels on admission are associated with primary composite end point (mortality and intensive care unit hospitalization) in COVID-19 patients. Patients (n = 80) with laboratory, clinical, and radiological confirmed COVID-19 were included in this cross-sectional study. Ten milliliter of peripheral venous blood were drawn within 24 hours of admission to estimate serum endocan levels. Data were analyzed using SPSS version 26.0 (IBM). Patients with the primary composite end point had significantly higher serum endocan levels than patients without (852.2 ± 522.7 vs 550.2 ± 440.8 ng/L, respectively; P < .01). In the logistic regression analysis, only increased serum endocan levels and increase in age were independent predictors of the primary composite end point (P < .05). In the receiver operating characteristics curve analysis, we found that a serum endocan level of 276.4 ng/L had a 97% sensitivity and 85% specificity for prediction of the primary composite end point. Baseline serum endocan levels may prove useful as a prognostic factor in patients hospitalized for COVID-19.