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Megakaryocytes and platelet-fibrin thrombi characterize multi-organ thrombosis at autopsy in COVID-19: A case series
Open accessAbstract
Background There is increasing recognition of a prothrombotic state in COVID-19. Post-mortem examination can provide important mechanistic insights. Methods We present a COVID-19 autopsy series including findings in lungs, heart, kidneys, liver, and bone, from a New York academic medical center. Findings In seven patients (four female), regardless of anticoagulation status, all autopsies demonstrated platelet-rich thrombi in the pulmonary, hepatic, renal, and cardiac microvasculature. Megakaryocytes were seen in higher than usual numbers in the lungs and heart. Two cases had thrombi in the large pulmonary arteries, where casts conformed to the anatomic location. Thrombi in the IVC were not found, but the deep leg veins were not dissected. Two cases had cardiac venous thrombosis with one case exhibiting septal myocardial infarction associated with intramyocardial venous thrombosis, without atherosclerosis. One case had focal acute lymphocyte-predominant inflammation in the myocardium with no virions found in cardiomyocytes. Otherwise, cardiac histopathological changes were limited to minimal epicardial inflammation ( n = 1), early ischemic injury ( n = 3), and mural fibrin thrombi ( n = 2). Platelet-rich peri‑tubular fibrin microthrombi were a prominent renal feature. Acute tubular necrosis, and red blood cell and granular casts were seen in multiple cases. Significant glomerular pathology was notably absent. Numerous platelet-fibrin microthrombi were identified in hepatic sinusoids. All lungs exhibited diffuse alveolar damage (DAD) with a spectrum of exudative and proliferative phases including hyaline membranes, and pneumocyte hyperplasia, with viral inclusions in epithelial cells and macrophages. Three cases had superimposed acute bronchopneumonia, focally necrotizing. Interpretation In this series of seven COVID-19 autopsies, thrombosis was a prominent feature in multiple organs, in some cases despite full anticoagulation and regardless of timing of the disease course, suggesting that thrombosis plays a role very early in the disease process. The finding of megakaryocytes and platelet-rich thrombi in the lungs, heart and kidneys suggests a role in thrombosis. Funding None.
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Metadata
- Authors
- Rapkiewicz, A. V., Mai, X., Carsons, S. E., Pittaluga, S., Kleiner, D. E., Berger, J. S., Thomas, S., Adler, N. M., Charytan, D. M., Gasmi, B., Hochman, J. S., & Reynolds, H. R.
- Venue
- eClinicalMedicine
- Publisher
- Elsevier BV
- Published
- 2020-07
- Volume
- 24
- Pages
- 100434
- ISSN
- 2589-5370 (ISSN-L)
- OpenAlex
- W3037229948
- Cited by
- 533
- References
- 41
- FWCI
- 14.40
- Type
- journal article
- Language
- en
- Open access
- gold
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- Rapkiewicz, A. V., Mai, X., Carsons, S. E., Pittaluga, S., Kleiner, D. E., Berger, J. S., Thomas, S., Adler, N. M., Charytan, D. M., Gasmi, B., Hochman, J. S., & Reynolds, H. R. (2020). Megakaryocytes and platelet-fibrin thrombi characterize multi-organ thrombosis at autopsy in COVID-19: A case series. eClinicalMedicine. https://doi.org/10.1016/j.eclinm.2020.100434
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