Search results for " aortic"

showing 10 items of 302 documents

Biomechanics and Pathobiology of Aortic Aneurysms

2011

Biomechanical weakening of the aorta leads to aneurysm formation and/or dissection and total biomechanical failure results in rupture, which is often fatal. The most common aneurysm is the abdominal aortic aneurysm (AAA) whereas thoracic aortic aneurysms (TAA) involve the ascending or descending segments of the aorta. Biomechanical strength of the aorta is maintained in part via balance between the integrity of the aortic medial and adventitial extracellular matrix and the health of the mural cells. From a biomechanical perspective, aneurysms rupture or dissect when wall stresses locally exceed the wall strength. Pathobiologic mechanisms, pre-disposing disorders and variability of patient d…

Aortic dissectionmedicine.medical_specialtyAortaWall Stressbusiness.industryConnective Tissue Growth FactorBiomechanicsSettore ING-IND/34 - Bioingegneria IndustrialeAnatomyDissection (medical)Bicuspid Aortic Valvemedicine.diseaseAbdominal Aortic AneurysmAbdominal aortic aneurysmAortic DissectionBicuspid aortic valveAneurysmBlood pressureInternal medicinemedicine.arterycardiovascular systemmedicineCardiologycardiovascular diseasesbusiness
researchProduct

Minimally invasive aortic valve surgery

2016

Aortic valve disease is a prevalent disorder that affects approximately 2% of the general adult population. Surgical aortic valve replacement is the gold standard treatment for symptomatic patients. This treatment has demonstrably proven to be both safe and effective. Over the last few decades, in an attempt to reduce surgical trauma, different minimally invasive approaches for aortic valve replacement have been developed and are now being increasingly utilized. A narrative review of the literature was carried out to describe the surgical techniques for minimally invasive aortic valve surgery and report the results from different experienced centers. Minimally invasive aortic valve replacem…

Aortic valve stenosiSymposium: Transcatheter aortic valve implantationOutcomesGeriatrics and GerontologyAortic valve stenosisMinimally invasiveCardiology and Cardiovascular MedicineAortic valve replacement; Aortic valve stenosis; Minimally invasive; Outcomes; Cardiology and Cardiovascular Medicine; Geriatrics and GerontologyOutcomeAortic valve replacement
researchProduct

Comparison of hemodynamic and structural indices of ascending thoracic aortic aneurysm as predicted by 2-way FSI, CFD rigid wall simulation and patie…

2018

Patient-specific computational modeling is increasingly being used to predict structural and hemodynamic parameters, especially when current clinical tools are not accessible. Indeed, pathophysiology of ascending thoracic aortic aneurysm (ATAA) has been simulated to quantify the risk of complications by novel prognostic parameters and thus to improve the clinical decision-making process related to the intervention of ATAAs. In this study, the relevance of aneurysmal wall elasticity in determining parameters of clinical importance, such as the wall shear stress (WSS), is discussed together with the significance of applying realistic boundary conditions to consider the aortic stretch and twis…

Aortic valveAdultMalePatient-Specific Modelingmedicine.medical_specialtyComputer science0206 medical engineeringFinite Element Analysisaorti failureHeart Valve DiseasesHemodynamicsFluid-solid interaction (FSI)Health Informatics02 engineering and technology030204 cardiovascular system & hematologyComputational fluid dynamicsThoracic aortic aneurysm03 medical and health sciences0302 clinical medicineBicuspid aortic valveBicuspid Aortic Valve DiseaseInternal medicinemedicineShear stressHumansComputer SimulationAgedAortic Aneurysm ThoracicStructural mechanicsbusiness.industryFinite element analysis (FEA)Models CardiovascularMiddle Agedmedicine.diseaseAscending thoracic aortic aneurysm020601 biomedical engineeringFinite element methodElasticityComputer Science Applicationsmedicine.anatomical_structureComputational fluid-dynamic (CFD)Aortic Valvecardiovascular systemCardiologyFemaleStress Mechanicalbusiness
researchProduct

Biomechanical study on ascending aortic aneurysms associated with quadricuspid aortic valve

2020

The quadricuspid aortic valve (QAV) is a rare anatomical situation and the biomechanical properties are not well known when it is associated with ascending aortic aneurysms (AsAA). The objective is to find out what is the biomechanical properties in such situation and to compare it with the existing data. In a sixty-three-years-old female (BMI 26,4) with hypertension disease, QAV, AsAA of 52 mm, an aortic valve and ascending aorta replacement were performed. The aortic wall sample was collected within 30 mins after replacement, partitioned related to medial, posterior, lateral, and anterior quadrants. The sample was cut in square size (15 mm × 15 mm, n = 13) with marking the circumferential…

Aortic valveAortic archAortabusiness.industryBiaxial tensile testAnatomy030204 cardiovascular system & hematologymedicine.disease03 medical and health sciencesQuadrant (abdomen)0302 clinical medicineBicuspid aortic valvemedicine.anatomical_structureQuadricuspid aortic valvemedicine.arteryAscending aortacardiovascular systemmedicine[INFO.INFO-IM]Computer Science [cs]/Medical Imaging030212 general & internal medicineCardiology and Cardiovascular MedicinebusinessComputingMilieux_MISCELLANEOUS
researchProduct

In Silico Shear and Intramural Stresses are Linked to Aortic Valve Morphology in Dilated Ascending Aorta

2017

Objective/Background: The development of ascending aortic dilatation in patients with bicuspid aortic valve (BAV) is highly variable, and this makes surgical decision strategies particularly challenging. The purpose of this study was to identify new predictors, other than the well established aortic size, that may help to stratify the risk of aortic dilatation in BAV patients.Methods: Using fluid-structure interaction analysis, both haemodynamic and structural parameters exerted on the ascending aortic wall of patients with either BAV ( n = 21) or tricuspid aortic valve (TAV; n = 13) with comparable age and aortic diameter (42.7 +/- 5.3 mm for BAV and 45.4 +/- 10.0 mm for TAV) were compared…

Aortic valveMalePatient-Specific ModelingComputed Tomography AngiographyHeart Valve DiseasesHemodynamics02 engineering and technology030204 cardiovascular system & hematology0302 clinical medicineBicuspid aortic valveBicuspid Aortic Valve DiseaseRisk FactorsAortaSinotubular JunctionModels CardiovascularSettore ING-IND/34 - Bioingegneria IndustrialeComputational modelingAneurysm of ascending aortaMiddle AgedAortic AneurysmHeart Valve Diseasemedicine.anatomical_structureAortic Valvecardiovascular systemCardiologyWall shear streFemaleCardiology and Cardiovascular MedicineBlood Flow VelocityDilatation PathologicHumanmedicine.medical_specialtyBicuspid aortic valve0206 medical engineeringAortography03 medical and health sciencesInternal medicinemedicine.arteryAscending aortamedicineHumansAgedAortabusiness.industryRisk FactorSignificant differenceHemodynamicsmedicine.disease020601 biomedical engineeringAortic wallRegional Blood FlowSurgeryStress Mechanicalbusiness
researchProduct

Focus on the unique mechanisms involved in thoracic aortic aneurysm formation in bicuspid aortic valve versus tricuspid aortic valve patients: clinic…

2013

OBJECTIVES: The involvement of different factors in the onset of thoracic aortic aneurysm (TAA) in patients with a bicuspid aortic valve (BAV) vs those with a tricuspid aortic valve (TAV) is well recognized. However, the molecular, genetic and cellular mechanisms driving TAA remain unclear. The aim of this study was to identify the different mechanisms involved in TAA development in patients with BAV vs TAV. METHODS: Aorta specimens and DNA samples were collected from 24 BAV (18 men and 6 women; mean age: 54.2 ± 14.39 years) and 110 TAV (79 men and 31 women, mean age: 66 ± 9.8 years) patients. A control group of 128 subjects (61 men and 67 woman, mean age: 61.1 ± 5.8 years) was also enrolle…

Aortic valveMaleThoracicHeart Valve DiseasesApoptosisPilot ProjectsBicuspid aortic valve; Clinical implications; Identifying different genetic and histological profiles; Thoracic aortic aneurysm; Tricuspid aortic valve; Adult; Aged; Aortic Aneurysm Thoracic; Aortic Valve; Apoptosis; Comorbidity; Female; Gene Frequency; Genetic Predisposition to Disease; Genotype; Heart Valve Diseases; Histocytochemistry; Humans; Male; Matrix Metalloproteinase 9; Middle Aged; Pilot Projects; Polymorphism Single Nucleotide; Risk Factors; Tricuspid ValveComorbidityBicuspid aortic valveBicuspid Aortic Valve DiseaseGene FrequencyFibrosisRisk FactorsClinical implicationsTricuspid valvebiologyHistocytochemistryGeneral MedicineSingle NucleotideMiddle AgedAortic Aneurysmmedicine.anatomical_structureMatrix Metalloproteinase 9Aortic ValveCardiologyFemaleTricuspid ValveCardiology and Cardiovascular MedicinePulmonary and Respiratory MedicineAdultmedicine.medical_specialtyBicuspid aortic valveGenotypeThoracic aortic aneurysmTricuspid aortic valvePolymorphism Single Nucleotidemedicine.arteryInternal medicineThoracic aortic aneurysmAscending aortamedicineSettore MED/05 - Patologia ClinicaHumansGenetic Predisposition to DiseasePolymorphismIdentifying different genetic and histological profilesAgedAortaAortic Aneurysm Thoracicbusiness.industryAngiotensin-converting enzymeSettore MED/23 - Chirurgia Cardiacamedicine.diseasebiology.proteinSurgerybusinessEuropean journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery
researchProduct

Outcomes of aortic valve repair according to valve morphology and surgical techniques

2012

OBJECTIVES: The aim of this study was to assess the impact of aortic valve morphology and different surgical aortic valve repair techni- ques on long-term clinical outcomes. METHODS: Between February 2003 and May 2010, 216 patients with aortic insufficiency underwent aortic valve repair in our institu- tion. Ages ranged between 26 and 82 years (mean 53 ± 15 years). Aortic valve dysfunctions, according to functional classification, were: type I in 55 patients (25.5%), type II in 126 (58.3%) and type III in 35 (16.2%). Sixty-six patients (27.7%) had a bicuspid valve. Aortic valve repair techniques included sub-commissural plasty in 138 patients, plication in 84, free-edge reinforcement in 80,…

Aortic valveMaleTime Factorsmedicine.medical_treatmentKaplan-Meier EstimateAortic valve repairRecurrenceRisk FactorsMitral valve80 and overHospital MortalityCoronary Artery BypassAortaUltrasonographyAged 80 and overTricuspid valveCalcinosisCardiac Valve AnnuloplastyMiddle AgedAortic valve repair • Bicuspid aortic valve • Tricuspid aortic valve • Aortic annulus stabilization medicine.anatomical_structureTreatment OutcomeAortic ValveReplantationcardiovascular systemCardiologyChordae TendineaeMitral ValveFemaleChordae tendineaeCardiology and Cardiovascular MedicineAdult; Aged; Aged 80 and over; Aorta; Aortic Valve; Aortic Valve Insufficiency; Blood Vessel Prosthesis Implantation; Calcinosis; Chordae Tendineae; Coronary Artery Bypass; Disease-Free Survival; Female; Hospital Mortality; Humans; Kaplan-Meier Estimate; Male; Middle Aged; Mitral Valve; Proportional Hazards Models; Recurrence; Replantation; Risk Assessment; Risk Factors; Time Factors; Treatment Outcome; Ultrasonography; Cardiac Valve Annuloplasty; Suture TechniquesPulmonary and Respiratory MedicineAdultmedicine.medical_specialtyAortic Valve InsufficiencyRisk AssessmentCardiac Valve AnnuloplastyDisease-Free SurvivalBlood Vessel Prosthesis ImplantationBicuspid valveInternal medicinemedicineHumansAgedProportional Hazards ModelsMitral valve repairbusiness.industrySuture TechniquesSettore MED/23 - Chirurgia CardiacaOriginal ArticlesSurgerySurgerybusiness
researchProduct

A multicentre European registry to evaluate the Direct Flow Medical transcatheter aortic valve system for the treatment of patients with severe aorti…

2016

Aims Our aim was to assess the clinical outcomes of the Direct Flow Medical Transcatheter Aortic Valve System (DFM-TAVS), when used in routine clinical practice. Methods and results This is a prospective, open-label, multicentre, post-market registry of patients treated with DFM-TAVS according to approved commercial indications. Echocardiographic and angiographic data were evaluated by an independent core laboratory and adverse events were adjudicated and classified according to VARC-2 criteria by an independent clinical events committee. The primary endpoint was freedom from all-cause mortality at 30 days post procedure. Secondary endpoints included procedural, early safety and efficacy en…

Aortic valveMalemedicine.medical_specialtyCardiac Catheterizationmedicine.medical_treatmentAortic Valve InsufficiencyRegurgitation (circulation)030204 cardiovascular system & hematologyTranscatheter Aortic Valve Replacement03 medical and health sciences0302 clinical medicineRisk FactorsInternal medicinemedicineClinical endpointHumans030212 general & internal medicineHeart valveProspective StudiesRegistriesCardiac catheterizationAgedAged 80 and overHeart Valve Prosthesis Implantationbusiness.industryAortic Valve Stenosismedicine.disease3. Good healthClinical trialStenosismedicine.anatomical_structureTreatment OutcomeAortic valve stenosisAortic ValveHeart Valve ProsthesisCardiologyFemaleCardiology and Cardiovascular MedicinebusinessEuroIntervention : journal of EuroPCR in collaboration with the Working Group on Interventional Cardiology of the European Society of Cardiology
researchProduct

Difference in hemodynamic and wall stress of ascending thoracic aortic aneurysms with bicuspid and tricuspid aortic valve.

2012

The aortic dissection (AoD) of an ascending thoracic aortic aneurysm (ATAA) initiates when the hemodynamic loads exerted on the aneurysmal wall overcome the adhesive forces holding the elastic layers together. Parallel coupled, two-way fluid–structure interaction (FSI) analyses were performed on patient-specific ATAAs obtained from patients with either bicuspid aortic valve (BAV) or tricuspid aortic valve (TAV) to evaluate hemodynamic predictors and wall stresses imparting aneurysm enlargement and AoD. Results showed a left-handed circumferential flow with slower-moving helical pattern in the aneurysm's center for BAV ATAAs whereas a slight deviation of the blood flow toward the anterolater…

Aortic valveMalemedicine.medical_specialtyFluid–structure interaction Aortic dissection Ascending thoracic aortic aneurysm Bicuspid aortic valveBiomedical EngineeringBiophysicsHeart Valve DiseasesAorta ThoracicThoracic aortic aneurysmArticleAortic aneurysmBicuspid aortic valveBicuspid Aortic Valve DiseaseInternal medicinemedicine.arteryCoronary CirculationAscending aortamedicineThoracic aortaHumansOrthopedics and Sports Medicinecardiovascular diseasesAgedAortic dissectionAortabusiness.industryRehabilitationHemodynamicsModels CardiovascularMiddle Agedmedicine.diseaseElasticityAortic Aneurysmmedicine.anatomical_structureAortic ValveCardiologycardiovascular systemFemaleTricuspid ValvebusinessJournal of biomechanics
researchProduct

Incidence, Predictive Factors, and Prognostic Impact of Silent Atrial Fibrillation After Transcatheter Aortic Valve Implantation.

2018

New onset atrial fibrillation post-transcatheter aortic valve implantation (TAVI) is common and is associated with adverse outcomes. However, silent atrial fibrillation (AF) is poorly documented in the context. This study sought to evaluate the incidence, predictive factors, and prognostic value of Silent AF post-TAVI. All the consecutive patients with TAVI were prospectively analyzed by continuous electrocardiogram monitoring≥48 hours after implantation. Silent AF was defined as asymptomatic episodes lasting at least 30 seconds. The population was divided into 3 groups: history of AF, no-AF, and silent AF. Among the 206 patients implanted with TAVI, 19 (16.1%) developed silent AF. Compared…

Aortic valveMalemedicine.medical_specialtyTime FactorsPopulationContext (language use)030204 cardiovascular system & hematologyAsymptomaticTranscatheter Aortic Valve Replacement03 medical and health sciencesElectrocardiography0302 clinical medicinePostoperative ComplicationsRisk FactorsInternal medicineAtrial FibrillationmedicineHumans030212 general & internal medicineProspective StudiesRegistriesProspective cohort studyeducationAged 80 and overeducation.field_of_studymedicine.diagnostic_testbusiness.industryIncidenceAtrial fibrillationAortic Valve Stenosismedicine.diseasePrognosismedicine.anatomical_structureAortic valve stenosisAortic ValveCardiologyFemaleFrancemedicine.symptomCardiology and Cardiovascular MedicinebusinessElectrocardiographyFollow-Up StudiesThe American journal of cardiology
researchProduct