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• W3205600165 abstract "The interesting article by Katsarou et al1Katsarou M. Grassi V. Lomazzi C. Domanin M. Trimarchi S. Acute retrograde type A intramural hematoma during severe acute respiratory syndrome coronavirus 2 pandemic.J Vasc Surg. 2021; 73: 2166-2167Abstract Full Text Full Text PDF PubMed Scopus (3) Google Scholar about aortic intramural hematoma complicating a severe acute respiratory disease coronavirus 2 (SARS-CoV-2) infection is compelling, and its pathophysiology needs to be elucidated further. We consider the promoting factors of coronavirus disease 2019 (COVID-19) to be the high number of angiotensin-converting enzyme 2 receptors present in the aortic walls. These receptors directly bind COVID-19 virions and lead to abnormal apoptosis of endothelial cells.2Roncati L. Gallo G. Manenti A. Palmieri B. Renin-angiotensin system: The unexpected flaw inside the human immune system revealed by SARS-CoV-2.Med Hypotheses. 2020; 140: 109686Crossref PubMed Scopus (33) Google Scholar This process can explain the direct onset of the rare acute aortitis associated with COVID-19.3Dhakal P. Khadka S. Clowes J.A. Chakinala R.C. Aortitis in COVID-19.IDCases. 2021; 24: e01063Crossref PubMed Scopus (10) Google Scholar For other vascular—mainly aortic—complications of SARS-CoV-2 infection, we emphasize the important role of the secondary damage to the vasa vasorum (VV), which begins with an acute lymphocytic endotheliitis. As in other capillaries and arterioles, it consists of a diffuse endothelial and parietal infiltration by mononuclear cells and neutrophils, followed by accelerated pyroptosis and thrombosis. This pathology can further evolve through activated B lymphocytes that generate plasma cells, in turn leading to a deposition of polyclonal immune complexes and complement fractions in vessels walls. This immunocomplex-mediated peri/pan-arteritis, evident on histology with neutrophil infiltration and accumulation of fibrinoid materials, seems to be a more severe leukocytoclastic vasculitis (Fig, A).4Manenti A. Farinetti A. Manco G. Mattioli A. Vasculitis and aortitis: COVID-19 challenging complications.J Vasc Surg. 2021; 73: 347-348Abstract Full Text Full Text PDF PubMed Scopus (15) Google Scholar The associated inflammatory state causes an increased release of cytokines, typically interleukin-6, and, at the same time, recruitment of platelets to perform, in agreement with their myeloid lineage, a covercytosis against the virions. Moreover, platelets strictly adhere to damaged endothelia and surround the fibrin aggregates. Newly manufactured antiphospholipid antibodies, as in a secondary antiphospholipid-like syndrome, favor, together with the basic COVID-19 procoagulative state, local thromboses, that acquire the particular feature of immunothrombosis. In medium and large arteries, this pathology involves the external VV as well, while the internal VV, because of their small caliber, thinner walls, and lower blood inflow, disappear as a direct result of the antecedent endothelial damage (Fig, B).5Roncati L. Manenti A. Mattioli A. The Covid-19 arterial thrombo-embolic complications: from inflammation to immunothrombosis through antiphospholipid antibodies.Ann Vasc Surg. 2021; 72: 216-217Abstract Full Text Full Text PDF PubMed Scopus (13) Google Scholar As shown,6Kugo H. Sukketsiri W. Tanaka H. Fujishima R. Moriyama T. Zaima N. Time-dependent pathological changes in hypoperfusion-induced abdominal aortic aneurysm.Biology (Basel). 2021; 10: 149PubMed Google Scholar the subsequent hypoxia in arterial walls produces hypoxia-inducible factor 1a, in turn releasing other substances, such as matrix metalloproteinases, macrophages, monocytes, and chemoattractant proteins, specific for secondary degenerative-inflammatory lesions. In addition to endothelin-1 and angiotensin II type 1, vasoconstrictors are active on the VV as well.6Kugo H. Sukketsiri W. Tanaka H. Fujishima R. Moriyama T. Zaima N. Time-dependent pathological changes in hypoperfusion-induced abdominal aortic aneurysm.Biology (Basel). 2021; 10: 149PubMed Google Scholar This process worsens the local preinflammatory or inflammatory conditions, already promoted by preexisting endothelial dysfunction, increases the degradation of collagen and elastic fibers, and greatly decreases the population of smooth muscle bundles in the media layer. In the VV, we have to consider, as an additional functional factor hampering blood inflow, their radial or circumferential external compression by inelastic atherosclerotic vessels, mainly when stressed by arterial hypertension. This cascade of pathological events directly explains the pathogenesis of penetrating endothelial ulcers that connect with the entire group of acute aortopathies associated with COVID-19, including mural thrombosis, intramural hematoma, and dissection (Fig). In contrast, the acute or subacute development of an aneurysm, which is in this case inflammatory, hypothesized to be caused by the decreased elasticity and increased fragility of the aortic walls, has not yet been reported.7Tanaka H. Unno N. Suzuki Y. Sano H. Yata T. Urano T. Hypoperfusion of the aortic wall secondary to degeneration of adventitial vasa vasorum causes abdominal aortic aneurysms.Curr Drug Targets. 2018; 19: 1327-1332Crossref PubMed Scopus (6) Google Scholar This unified anatomo-clinical notion of acute aortopathies, including different pathologies with reciprocal connections, fits well with the wide spectrum of COVID-19 features and prompts research on this disease complications, which may be otherwise overlooked. Acute retrograde type A intramural hematoma during severe acute respiratory syndrome coronavirus 2 pandemicJournal of Vascular SurgeryVol. 73Issue 6PreviewAcute intramural hematomas (IMHs) occur in ∼6% of patients with acute dissections (ADs) and mostly affect the descending aorta.1 Type A IMHs involve the ascending aorta and type B IMHs do not involve the ascending aorta. Retrograde type A IMHs (retro-TAIMHs) originate in the descending aorta and extend into the arch or ascending aorta. TAIMHs with distal AD carry an in-hospital mortality risk of 12% to 26%.1,2 Full-Text PDF Open ArchiveReplyJournal of Vascular SurgeryVol. 74Issue 5PreviewWe thank Dr Roncati for reading and commenting1 on our case reporting an acute aortic intramural hematoma (IMH) in a SARS-CoV-2 positive patient.2 The author1 suggests a combination of different pathophysiologic mechanisms of aortic injury in these patients, which is undoubtedly an interesting aspect to consider in the ever-growing association between SARS-CoV-2 infection and vascular disease.3 In the clinical setting, SARS-CoV-2 is associated with hypercoagulability leading to peripheral arterial and venous thrombosis, but some aortic phenomena have been described as well. Full-Text PDF" @default.
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• W3205600165 title "Toward a unified pathophysiology in COVID-19 acute aortopathies" @default.
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