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Platelet aggregates detected using quantitative phase imaging associate with COVID-19 severity.

Christian Klenk1, Johanna Erber2, David Fresacher1,3

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Summary

A new point-of-care imaging method rapidly quantifies platelet and leukocyte aggregates, identifying a strong link between these aggregates and COVID-19 severity for better patient risk stratification.

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Area of Science:

  • Biomedical Engineering
  • Hematology
  • Infectious Disease

Background:

  • The clinical spectrum of SARS-CoV-2 infection varies widely, necessitating reliable biomarkers for risk stratification.
  • COVID-19-associated coagulopathy, driven by immunothrombosis involving platelets and immune cells, is a key disease feature.
  • Existing biomarkers lack validation, simplicity, or economic feasibility for widespread clinical use.

Purpose of the Study:

  • To develop and validate a rapid, point-of-care (POC) method for analyzing blood cell aggregates in COVID-19 patients.
  • To investigate the association between specific blood cell aggregates and the severity of COVID-19.
  • To explore the relationship between aggregate composition, platelet size, and disease severity.

Main Methods:

  • A label-free quantitative phase imaging technique was employed for high-resolution analysis of cell aggregates.
  • The method allows for the identification and quantification of platelet and platelet-leukocyte aggregates within 30 minutes.
  • The approach is designed for prospective validation as a point-of-care test.

Main Results:

  • A significant association was found between the quantity of platelet and platelet-leukocyte aggregates and COVID-19 severity.
  • The study observed correlations between disease severity, the composition of these aggregates, and the size distribution of platelets within them.
  • This suggests aggregate characteristics can serve as indicators of disease progression.

Conclusions:

  • A novel, POC-compatible method enables rapid quantitative analysis of blood cell aggregates in COVID-19 patients.
  • The findings highlight the potential of quantifying platelet-leukocyte aggregates as a biomarker for COVID-19 severity.
  • This approach could aid in early risk stratification and guide clinical management strategies.