Search results for "Wall shear stress"

showing 4 items of 4 documents

STUDIO NUMERICO DELL'EMODINAMICA IN PAZIENTI CON DISSECAZIONE AORTICA DI TIPO B

2013

The development of type B aortic dissection (AoD) is caused by altered haemodynamic forces exerted on false and true lumina of dissected aorta. This work aims to study haemodynamic and morphological proprieties, which influence the progression or stability of type B AoD. Computational fluid-dynamic analyses were performed on three patients with type B AoD, whose two presented an aneurysm evolution and one presented no further complication connected with dissection. Blood flow features showed that the true lumen flow was laminar and uniform while false lumen flow lost the laminar characteristic with consequent vorticity formation. The entry point zone proximal to the aortic arch showed both …

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineCFD dissecazione aortica Wall Shear Stress
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Regional variation of wall shear stress in ascending thoracic aortic aneurysms.

2014

The development of an ascending thoracic aortic aneurysm is likely caused by excessive hemodynamic loads exerted on the aneurysmal wall. Computational fluid-dynamic analyses were performed on patient-specific ascending thoracic aortic aneurysms obtained from patients with either bicuspid aortic valve or tricuspid aortic valve to evaluate hemodynamic and wall shear parameters, imparting aneurysm enlargement. Results showed an accelerated flow along the outer aortic wall with helical flow in the aneurysm center for bicuspid aortic valve ascending thoracic aortic aneurysms. In a different way, tricuspid aortic valve ascending thoracic aortic aneurysms exhibited normal systolic flow without su…

Computational fluid dynamics ascending thoracic aortic aneurysm bicuspid aortic valve wall shear stress hypertensionAortic valvemedicine.medical_specialtyAortabusiness.industryMechanical EngineeringSettore ING-IND/34 - Bioingegneria IndustrialeHemodynamicsGeneral Medicinemedicine.diseaseThoracic aortic aneurysmSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineBicuspid aortic valveAneurysmmedicine.anatomical_structuremedicine.arteryInternal medicinecardiovascular systemmedicineCardiologyShear stresscardiovascular diseasesbusinessHelical flowProceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
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Role of Hemodynamic Forces in Unruptured Intracranial Aneurysms: An Overview of a Complex Scenario.

2017

Background An understanding of the natural history of unruptured intracranial aneurysms (IAs) has always played a critical role in presurgical or endovascular planning, to avoid possibly fatal events. Size, shape, morphology, and location are known risk factors for rupture of an aneurysm, but morphologic parameters alone may not be sufficient to perform proper rupture risk stratification. Methods We performed a systematic PubMed search and focused on hemodynamics forces that may influence aneurysmal initiation, growth, and rupture. Results We included 223 studies describing several hemodynamic parameters related to aneurysm natural history. In these studies, different modalities of aneurysm…

medicine.medical_specialty030218 nuclear medicine & medical imagingWall shear stress03 medical and health sciences0302 clinical medicineAneurysmComputational fluid dynamicmedicineHumansRupture riskHemodynamicIntensive care medicineCerebral aneurysmHemodynamic forcesModalitiesbusiness.industryHemodynamicsIntracranial AneurysmHemodynamics Intracranial aneurysms Cerebral aneurysm Wall shear stressCcomputational fluid dynamics.Flow patternmedicine.diseaseSurgeryCerebral AngiographyNatural historyCerebrovascular CirculationTreatment strategySurgeryNeurology (clinical)business030217 neurology & neurosurgeryWorld neurosurgery
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Computational Modeling of Ascending Thoracic Aortic Aneurysm and Dissection

CFD analyses aortic aneurysm 3D modeling Wall Shear Stress
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