Browsing Bergen Open Research Archive by Author "Urheim, Stig"
Now showing items 1-11 of 11
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Characterisation of global and regional mitral annular strains in an acute porcine model
Persson, Robert Matongo; Aguilera, Hans Martin Dahl; Grong, Ketil; Kvitting, John-Peder Escobar; Stangeland, Lodve; Haaverstad, Rune; Urheim, Stig; Prot, Victorien Emile (Journal article, 2024)OBJECTIVES This study aimed to explore regional mitral annular strain using a novel computational method. METHODS Eight pigs underwent implantation with piezoelectric transducers around the mitral annulus. Interventions ... -
Comparison of ultrasound vector flow imaging and CFD simulations with PIV measurements of flow in a left ventricular outflow trackt phantom - Implications for clinical use and in silico studies
Leinan, Paul Roger; Grønli, Thomas; Skjetne, Paal; Wigen, Morten Smedsrud; Urheim, Stig; Løvstakken, Lasse; Dahl, Sigrid Kaarstad (Journal article; Peer reviewed, 2022)In this study we have compared two modalities for flow quantification from measurement data; ultrasound (US) and shadow particle image velocimetry (PIV), and a flow simulation model using computational fluid dynamics (CFD). ... -
Correlation between Murmurs and Echocardiographic Findings; From an Imaging Cardiologist Point of View
Saeed, Sahrai; Mohamed Ali, Abukar; Wasim, Daanyaal; Risnes, Ivar; Urheim, Stig (Journal article; Peer reviewed, 2023)A heart murmur in adults is a common reason for referral for echocardiography at most general cardiology clinics in Europe. A murmur may indicate either a mild age-related valvular calcification or regurgitation, or represent ... -
Finite element analysis of mitral valve annuloplasty in Barlow's disease
Aguilera, Hans Martin; Urheim, Stig; Persson, Robert; Haaverstad, Rune; Skallerud, Bjørn Helge; Prot, Victorien Emile (Journal article; Peer reviewed, 2022)Barlow’s Disease affects the entire mitral valve apparatus causing mitral regurgitation. Standard annuloplasty procedures lead to an average of 55% annular area reduction of the end diastolic pre-operative annular area in ... -
Impact of aortic valve stenosis on myocardial deformation in different left ventricular levels: A three-dimensional speckle tracking echocardiography study
Hjertaas, Johannes Just; Einarsen, Eigir; Gerdts, Eva; Kokorina, Marina Victorovna; Moen, Christian Arvei; Urheim, Stig; Saeed, Sahrai; Matre, Knut (Journal article; Peer reviewed, 2023)Background: Global systolic left ventricular (LV) myocardial function progressively declines as degenerative aortic valve stenosis (AS) progresses. Whether this results in uniformly distributed deformation changes from ... -
In silico analysis provides insights for patient-specific annuloplasty in Barlow’s disease
Aguilera, Hans Martin Dahl; Persson, Robert; Haaverstad, Rune; Skallerud, Bjørn Helge; Prot, Victorien Emile; Urheim, Stig (Journal article; Peer reviewed, 2023)Objective To predict the required mitral annular area reduction in patients with Barlow's disease to obtain a predefined leaflet area index by a novel in silico modeling method. Methods Three-dimensional echocardiography ... -
Influence of Annular Dynamics and Material Behavior in Finite Element Analysis of Barlow’s Mitral Valve Disease
Aguilera, Hans Martin; Urheim, Stig; Skallerud, Bjørn Helge; Prot, Victorien Emile (Journal article; Peer reviewed, 2021)Barlow’s disease affects the entire mitral valve apparatus, by altering several of the fundamental mechanisms in the mitral valve which ensures unidirectional blood flow between the left atrium and the left ventricle. In ... -
Mechanical behavior and collagen structure of degenerative mitral valve leaflets and a finite element model of primary mitral regurgitation
Sadeghinia, Mohammadjavad; Aguilera, Hans Martin Dahl; Urheim, Stig; Persson, Robert; Ellensen, Vegard Skalstad; Haaverstad, Rune; Holzapfel, Gerhard; Skallerud, Bjørn Helge; Prot, Victorien Emile (Journal article; Peer reviewed, 2023)Degenerative mitral valve disease is the main cause of primary mitral regurgitation with two phenotypes: fibroelastic deficiency (FED) often with localized myxomatous degeneration and diffuse myxomatous degeneration or ... -
Mitral annular dynamics are influenced by left ventricular load and contractility in an acute animal model
Persson, Robert Matongo; Aguilera, Hans Martin Dahl; Kvitting, Jon Peder Escobar; Grong, Ketil; Prot, Victorien Emile; Salminen, Pirjo-Riitta; Svenheim, Bård; Leiknes, Anita; Stangeland, Lodve; Haaverstad, Rune; Urheim, Stig (Journal article; Peer reviewed, 2023)The purpose of this study was to investigate the effects of loading conditions and left ventricular (LV) contractility on mitral annular dynamics. In 10 anesthetized pigs, eight piezoelectric transducers were implanted ... -
Quantified planar collagen distribution in healthy and degenerative mitral valve: biomechanical and clinical implications
Sadeghinia, Mohammad Javad; Persson, Robert; Ellensen, Vegard Skalstad; Haaverstad, Rune; Holzapfel, Gerhard; Skallerud, Bjørn Helge; Prot, Victorien Emile; Urheim, Stig (Journal article; Peer reviewed, 2024)Degenerative mitral valve disease is a common valvular disease with two arguably distinct phenotypes: fibroelastic deficiency and Barlow’s disease. These phenotypes significantly alter the microstructures of the leaflets, ... -
Sex differences in left atrial volumes, mechanics, and stiffness in primary mitral regurgitation - a combined 2D and 3D echocardiographic study
Berg-Hansen, Christian Engelsen; Sindre, Rasmus Bach; Grymyr, Lisa Marie Dale; Rogge, Barbara; Valeur, Andreas Egeli; Urheim, Stig; Hung, Judy; Cramariuc, Dana (Journal article; Peer reviewed, 2024)Aims Mitral regurgitation (MR) causes left atrial (LA) enlargement and impaired reservoir function. We assessed whether changes in LA size, strain, and stiffness in significant (moderate or greater) primary MR are ...