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Interleukin-6 and the determinants of severe COVID-19: A retrospective cohort study

Wael Hafez1,2, Prashant Nasa3, Ahmed Khairy1

  • 1Internal Medicine, NMC Royal Hospital, Khalifa City, Abu Dhabi, United Arab Emirates.

Medicine
|November 14, 2023
PubMed

Insights

Elevated interleukin-6 (IL-6) levels correlate with severe COVID-19 and increased mortality risk. Understanding IL-6 and patient characteristics aids in predicting severe disease and guiding early treatment strategies for coronavirus disease 2019.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Clinical Medicine

Background:

  • Severe COVID-19 is linked to elevated cytokine levels, particularly interleukin-6 (IL-6).
  • High IL-6 levels may indicate a heightened immune response, potentially leading to organ failure or death.
  • Predicting COVID-19 severity and patient outcomes is crucial for timely therapeutic interventions.

Purpose of the Study:

  • To investigate the association between serum IL-6 levels and COVID-19 severity.
  • To examine demographic, clinical, and biochemical factors related to IL-6 levels and disease severity.
  • To identify predictors of severe COVID-19 for early intervention strategies.

Main Methods:

  • A cohort study of 374 COVID-19 inpatients was conducted between November 2020 and November 2021.
  • Serum IL-6 levels, demographic data, clinical characteristics, and biochemical markers were analyzed.
  • Statistical analyses, including univariate and multivariate analyses, were performed to assess associations.

Main Results:

  • The elderly population showed a higher risk for severe COVID-19.
  • Higher levels of white blood cells, D-dimer, lactate dehydrogenase, creatinine, ferritin, prothrombin time, procalcitonin, and fibrinogen were observed in severe cases.
  • While univariate analysis showed associations between higher IL-6 and C-reactive protein, troponin, ICU admission, severity score, and mortality, these did not persist in multivariate analysis.

Conclusions:

  • Serum IL-6 levels, alongside demographic and clinical variables, influence COVID-19 severity.
  • Identifying patients at risk for severe disease is possible through analysis of these characteristics.
  • Further large-scale research is warranted to elucidate the role of IL-6 in COVID-19 outcomes.

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