D-dimer levels and lymphocyte counts as prognostic and predictive factors in patients with COVID-19 D-dimer, COVID-19

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Fatma Çölkesen
Şule Özdemir Armağan
Fatih Yucel
Arzu Tarakçı
Fatma Kacar
Mihriban Şengöz
Esma Eroğlu
Fatih Çölkesen

Abstract

Objective: Coronavirus Disease 2019 (COVID-19) is characterized by high fever, sudden developing respiratory distress, and radiological findings failing to respond to conventional treatments. The purpose of this study is to identify the association of D-dimer levels and lymphocyte counts with poor prognosis and to predict the clinical course in patients with COVID-19.


Methods: A total of 118 hospitalized adult patients diagnosed with COVID-19  were included in the study. According to the National Institutes of Health (NIH) COVID-19 treatment guidelines, patients were divided into two groups with severe disease (n= 26) and non-severe (n= 92) disease. Detected at the time of diagnosis, D-dimer levels and lymphocyte counts were compared between severe and non-severe COVID-19 patient groups. Distinctive performance analysis of  these values  was performed, and cut-off  values were determined.


Results: The mean age of patients was 62 ± 7 years (range 42-80 years), and 63 (53.4 %) were female. The lymphocyte count was  lower (p <0.001), and D-dimer was  higher in patients with severe COVID-19 compared to non-severe patients (p <0.001). D-dimer's cut-off point when the sum of specificity and sensitivity is maximized was 2 mg/L (sensitivity, 0.731; specificity, 0.913), and 1500/mm3 was for lymphocyte count (sensitivity, 0.692; specificity, 0.609). Lymphocyte count and D-dimer had a significant discrimination power (AUC: 0.745 [95 CI: 0.644 - 0.846 ],  AUC: 0.928 [95% CI: 0.879 - 0.978] respectively, p <0.0001).


Conclusion: The lymphocyte value of  ≤ 1500/mm3 and D-dimer value of  ≥ 2 mg/L  can be used in the early determination of patients with poor prognosis in COVID-19. Using these cut-off values for D-dimer and lymphocyte count will help predict prognosis and make rapid treatment decisions in patients with COVID-19.

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How to Cite
Çölkesen, F., Özdemir Armağan, Şule, Yucel, F., Tarakçı, A., Kacar, F., Şengöz, M., Eroğlu, E., & Çölkesen, F. (2021). D-dimer levels and lymphocyte counts as prognostic and predictive factors in patients with COVID-19. Medical Science and Discovery, 8(2), 101-106. https://doi.org/10.36472/msd.v8i2.478
Section
Research Article

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