Comparison of the ENATE approach and discontinuous Galerkin spectral element method in 1D nonlinear transport equations

In this paper a comparison of the performance of two ways of discretizing the nonlinear convection-diffusion equation in a one-dimensional (1D) domain is performed. The two approaches can be considered within the class of high-order methods. The first one is the discontinuous Galerkin method, which has been profusely used to solve general transport equations, either coupled as the Navier-Stokes equations, or on their own. On the other hand, the ENATE procedure (Enhanced Numerical Approximation of a Transport Equation), uses the exact solution to obtain an exact algebraic equation with integral coefficients that link nodal values with a three-point stencil. This paper is the first of thorough assessments of ENATE by comparing it with well-established high-order methods. Several test cases of the steady Burgers' equation with and without source have been chosen for comparison

Aortic septotomy with scissor-technique

Viene descritta tecnica innovativa per il ridurre le complicanze legate alla dissezione aorta toracic

Acute deep vein thrombosis in COVID 19 hospitalized patients. Risk factors and clinical outcomes

Nello studio vengono analizzati i fattori di rischio in pazienti con infezione da COVID 19 e trombosi venosa profond

The negative effects of reduced attention to standard guidelines for screening and surgery of abdominal aortic aneurysms during the coronavirus disease 2019 pandemic

Si pone in evidenza l'importanza dello screening nella popolazione per aneurismi dell'aorta addominale

Endovascular Surgery during COVID 19 virus pandemic as a valid alternative to open surgery

Lo studio sottolinea i vantaggi della chirurgia endovascolare durante la fase acuta della pandemia da COVID1

Re: "Endothelitis in COVID-19-positive patients after extremity amputation for acute thrombotic events"

Ilonzo et al reported, in their recent and interesting article, their clinical experience in 4 patients affected by COVID-19 and undergoing major limb amputation secondary to acute irreversible ischemia. On histological examination with hematoxylin/eosin they found inflammatory cells associated with endothelium/apoptotic bodies, mononuclear cells, small vessel congestion, and lymphocytic endotheliitis and concluded that the findings in these patients is more likely an infectious angiitis due to COVID-19. In our experience we have observed numerous cases of venous and arterial thromboembolism not only in the acute phase of COVID-19, but (even more interestingly) even after recovery. Whether SARS-CoV-2 is able to directly attack vascular endothelial cells expressing high levels of ACE2, and then lead to abnormal coagulation and sepsis, still needs to be explored

Abdominal aorta angiosarcoma after endovascular aneurysm repair

Primary tumors originating within the wall of the arteries are rare and they frequently manifest late, making effective treatment a challenge. We describe here a case of Abdominal Aorta AngioSarcoma masqueraded as an infected EndoVascular Aortic Repair. The knowledge of this pathology from vascular surgeons and radiologist is crucial, because a prompt diagnosis and treatment can improve the prognosis

Acute arterial and deep venous thromboembolism in COVID-19 patients. Risk factors and personalized therapy

The Lombardy region suffered severely during the acute phase of the coronavirus diease 2019 outbreak in Italy (Mar-Apr 2020) with 16,000 diagnosed coronavirus disease 2019-related deaths (49% of the total coronavirus disease 2019-related deaths in Italy). In the area surrounding Pavia during the critical stage of the outbreak (Mar-Apr 2020), 1,225 of the documented 4,200 deaths were related to coronavirus disease 2019 infection, with a mortality rate of 181/100,000 inhabitants and an increase in deaths of 138% compared with the same period during previous years. Our aim was to report the experience of the Department of Vascular Surgery of Pavia (Lombardy, Italy), including the lessons learned and future perspectives regarding the management of coronavirus disease 2019 patients who developed severe acute ischemia with impending lower limb loss or deep vein thrombosis