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Mechanical mitral

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https://www.readbyqxmd.com/read/28342794/stented-bovine-jugular-vein-graft-melody-valve-in-mitral-position-could-be-an-alternative-for-mechanical-valve-replacement-in-the-pediatric-population
#1
Álvaro González Rocafort, Ángel Aroca, César Abelleira, Hernán Carnicer, Carlos Labrandero, Sandra Villagrá
No abstract text is available yet for this article.
March 22, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28336153/quantification-and-comparison-of-the-mechanical-properties-of-four-human-cardiac-valves
#2
Thuy Pham, Fatiesa Sulejmani, Erica Shin, Di Wang, Wei Sun
OBJECTIVE: Although having the same ability to permit unidirectional flow within the heart, the four main valves-the mitral valve (MV), aortic (AV), tricuspid (TV) and pulmonary (PV) valves-experience different loading conditions; thus, they exhibit different structural integrity from one another. Most research on heart valve mechanics have been conducted mainly on MV and AV or an individual valve, but none quantify and compare the mechanical and structural properties among the four valves from the same aged patient population whose death was unrelated to cardiovascular disease...
March 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28329237/extensive-infective-endocarditis-of-the-aortic-root-and-the-aortic-mitral-continuity-a-mitral-valve-sparing-approach%C3%A2
#3
Anton Tomšic, Adriaan W Schneider, Meindert Palmen, Thomas J van Brakel, Michel I M Versteegh, Robert J M Klautz
OBJECTIVES: Severe cases of infective endocarditis (IE) of the aortic valve can cause aortic root destruction and affect the surrounding structures, including the aortic-mitral continuity, the anterior mitral valve leaflet and the roof of the left atrium. Reconstruction after resection of all infected tissue remains challenging. We describe our surgical approach and the mid-term results. METHODS: Between January 2004 and December 2015, 35 patients underwent surgery for extensive IE of the aortic valve with destruction of the aortic root, the aortic-mitral continuity and the mitral valve...
February 23, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28314761/hypoxia-mediated-regulation-of-the-secretory-properties-of-mitral-valve-interstitial-cells
#4
Kareem Salhiyyah, Padmini Sarathchandra, Najma Latif, Magdi H Yacoub, Adrian H Chester
The sophisticated function of the mitral valve depends to a large extent on the extracellular matrix (ECM) and specific cellular components. These are tightly regulated by a repertoire of mechanical stimuli and biological pathways. One potentially important pathway is hypoxia. The purpose of this investigation is to determine the effect of hypoxia on the regulation of mitral valve interstitial cells (MVIC) with respect to the synthesis and secretion of extracellular matrix proteins. Hypoxia resulted in reduced production of total collagen and sulphated glycosaminoglycans (sGAG) in cultured porcine MVIC...
March 17, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28302288/valvular-heart-disease-patients-on-edoxaban-or-warfarin-in-the-engage%C3%A2-af-timi-48-trial
#5
Raffaele De Caterina, Giulia Renda, Anthony P Carnicelli, Francesco Nordio, Marco Trevisan, Michele F Mercuri, Christian T Ruff, Elliott M Antman, Eugene Braunwald, Robert P Giugliano
BACKGROUND: The use of non-vitamin K antagonist oral anticoagulants (NOACs) instead of vitamin K antagonists (VKAs) in patients with atrial fibrillation (AF) and coexisting valvular heart disease (VHD) is of substantial interest. OBJECTIVES: This study explored outcomes in patients with AF with and without VHD in the ENGAGE AF-TIMI 48 (Effective Anticoagulation with factor Xa Next Generation in Atrial Fibrillation-Thrombolysis In Myocardial Infarction 48) trial, comparing edoxaban with warfarin...
March 21, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28302287/non-vitamin-k-antagonist-oral-anticoagulants-in-patients-with-atrial-fibrillation-and-valvular-heart-disease
#6
Giulia Renda, Fabrizio Ricci, Robert P Giugliano, Raffaele De Caterina
BACKGROUND: Valvular heart disease (VHD) and atrial fibrillation (AF) often coexist. Phase III trials comparing non-vitamin K antagonist oral anticoagulants (NOACs) with warfarin excluded patients with moderate/severe mitral stenosis or mechanical heart valves, but variably included patients with other VHD and valve surgeries. OBJECTIVES: This study aimed to determine relative safety and efficacy of NOACs in patients with VHD. METHODS: We performed a meta-analysis of the 4 phase III AF trials of the currently available NOACs versus warfarin in patients with coexisting VHD to assess pooled estimates of relative risk (RR) and 95% confidence intervals (CIs) for stroke/systemic embolic events (SSEE), major bleeding, intracranial hemorrhage (ICH), and all-cause death...
March 21, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28296135/assessment-of-trans-aortic-pressure-gradient-using-a-coronary-pressure-wire-in-patients-with-mechanical-aortic-and-mitral-valve-prostheses
#7
Nisharahmed Kherada, Juan Carlos Brenes, Annapoorna S Kini, George D Dangas
Accurate evaluation of trans-aortic valvular pressure gradients is challenging in cases where dual mechanical aortic and mitral valve prostheses are present. Non-invasive Doppler echocardiographic imaging has its limitations due to multiple geometric assumptions. Invasive measurement of trans-valvular gradients with cardiac catheterization can provide further information in patients with two mechanical valves, where simultaneous pressure measurements in the left ventricle and ascending aorta must be obtained...
March 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28292860/cardiac-computed-tomography-and-magnetic-resonance-imaging-in-the-evaluation-of-mitral-and-tricuspid-valve-disease-implications-for-transcatheter-interventions
#8
Christopher Naoum, Philipp Blanke, João L Cavalcante, Jonathon Leipsic
Transcatheter interventions to treat mitral and tricuspid valve disease are becoming increasingly available because of the growing number of elderly patients with significant comorbidities or high operative risk. Thorough clinical and imaging evaluation in these patients is essential. The latter involves both characterization of the mechanism and severity of valvular disease as well as determining the hemodynamic consequences and extent of ventricular remodeling, which is an important predictor of future outcomes...
March 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28290178/multiple-valvular-complications-of-hypereosinophilic-syndrome
#9
Zoltán Pozsonyi, Szabolcs Benedek, Pál Sármán, Lívia Jánoskuti, Tivadar Hüttl, Astrid Apor
Endomyocardial fibrosis (EMF) is the most common cardiac abnormality in hyeperosinophilic syndrome (HES), sometimes complicated with mitral valve disease. Mitral valve disease without ventricular manifestation is very rare, however. Case reports link HES to prosthetic valve thrombosis (PVT), but the optimal type of prosthetic valve in HES is not known. Herein is reported the case of a young female HES patient with secondary mitral valve degeneration and severe regurgitation. A mechanical prosthetic valve was implanted six months after she was diagnosed with HES, but despite anticoagulation and antiplatelet therapy she developed PVT three months later...
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28290177/left-ventricular-outflow-tract-obstruction-and-systolic-anterior-motion-of-the-mitral-valve-in-the-absence-of-hypertrophic-cardiomyopathy
#10
Natasha Aleksova, Alice Wang, Christopher A Glover, Thierry Mesana, Girish Dwivedi
Systolic anterior motion of the mitral valve is a mechanism for the development of left ventricular outflow tract (LVOT) obstruction. While often associated with left ventricular hypertrophy (LVH), a case is reported of symptomatic LVOT obstruction due to intrinsic mitral valve pathology in the absence of hypertrophy or cardiomyopathy. This case highlights the importance of recognizing isolated mitral valve pathology as a treatable cause of LVOT obstruction.
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28290172/frequency-mechanism-and-severity-of-mitral-regurgitation-are-there-any-differences-between-primary-and-secondary-mitral-regurgitation
#11
José L Zamorano, Juan Manuel Monteagudo, Dolores Mesa, Teresa Gonzalez-Alujas, Marta Sitges, Fernando Carrasco-Chinchilla, Chi-Hion Li, Antonio Grande-Trillo, Amparo Martinez, Javier Matabuena, David Alonso-Rodriguez, Covadonga Fernandez-Golfin
BACKGROUND: Although mitral regurgitation (MR) is a well-recognized prognosis factor, its true prevalence is probably underestimated and its etiology and mechanisms have not been sufficiently explored. The study aim was to evaluate the burden of MR, focusing attention on its frequency, severity, etiology, mechanism, and other associated conditions. METHODS: Between February and June 2015, a total of 39,855 consecutive echocardiographic studies was performed at nine tertiary hospitals, and were prospectively included in the study...
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28290168/early-results-of-rheumatic-mitral-valve-repair
#12
Giuseppe Petrone, Panagiotis Theodoropoulos, Prakash P Punjabi
BACKGROUND: Mitral valve repair (MVr) in rheumatic heart disease (RHD) remains challenging. The present authors' surgical experience of MVr in 56 patients with RHD operated in between January 2011 and September 2014 is reported. METHODS: Among the patients (mean age 32 ± 11 years), 11 were in NYHA functional class II, 32 in class III, and seven in class IV. An adequate or oversized autologous pericardial patch was sutured to extend the coaptating edge of both the anterior leaflet (in 18 patients) and the posterior leaflet (in 30 patients)...
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28290167/simple-interrupted-suturing-for-redo-mitral-valve-replacement
#13
Hiroshi Furukawa, Taishi Tamura, Takeshi Honda, Hiroki Takiuchi, Masahiko Kuinose, Kazuo Tanemoto
BACKGROUND: An evaluation was made of the early clinical outcomes and efficacies of simple interrupted suturing (SIS) for redo mitral valve replacement (MVR). METHODS: Among 336 mitral valve surgery patients at the authors' institution between April 2000 and May 2014, a total of 21 redo MVR using SIS (12 women, nine men; mean age 67±11 years; range 32-80 years) participated in the study. Surgical indications for redo MVR were paravalvular leakage (PVL) in 10 patients, prosthetic valve endocarditis in five, mechanical valve thrombosis in three, and structural valve deterioration (SVD) of the bioprosthesis in three...
November 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28290006/exercise-testing-and-stress-imaging-in-mitral-valve-disease
#14
REVIEW
Damien Voilliot, Patrizio Lancellotti
Mitral valve disease represented by mitral stenosis and mitral regurgitation is the second most frequent valvulopathy. Mitral stenosis leads to an increased left atrial pressure whereas mitral regurgitation leads to an increased left atrial pressure associated with a volume overload. Secondary to an upstream transmission of this overpressure, both mitral stenosis and regurgitation lead to pulmonary hypertension and right heart failure. In addition, mitral regurgitation also leads to left ventricular dilatation and dysfunction with left heart failure...
March 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28285328/left-ventricular-mechanics-in-isolated-mild-mitral-stenosis-a-three-dimensional-speckle-tracking-study
#15
Esra Poyraz, Tuğba Kemaloğlu Öz, Gönül Zeren, Tolga Sinan Güvenç, Cevdet Dönmez, Fatma Can, Rengin Çetin Güvenç, Şennur Ünal Dayı
In a fraction of patients with mild mitral stenosis, left ventricular systolic function deteriorates despite the lack of hemodynamic load imposed by the dysfunctioning valve. Neither the predisposing factors nor the earlier changes in left ventricular contractility were understood adequately. In the present study we aimed to evaluate left ventricular mechanics using three-dimensional (3D) speckle tracking echocardiography. A total of 31 patients with mild rheumatic mitral stenosis and 27 healthy controls were enrolled to the study...
March 11, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28283244/left-atrial-mechanics-in-patients-with-acute-stemi-and-secondary-mitral-regurgitation-a-prospective-pilot-cmr-feature-tracking-study
#16
Tomas Lapinskas, Paulius Bučius, Laura Urbonaitė, Agnieta Stabinskaitė, Živilė Valuckienė, Lina Jankauskaitė, Rimantas Benetis, Remigijus Žaliūnas
BACKGROUND AND OBJECTIVE: Left atrium (LA) is an important biomarker of adverse cardiovascular outcomes and cerebrovascular events. This study aimed to evaluate LA myocardial deformation using cardiac magnetic resonance feature tracking (CMR-FT) in patients with acute ST-segment elevation myocardial infarction (STEMI) and secondary mitral regurgitation (MR). Additionally, to assess interobserver and intraobserver variability of the technique. MATERIALS AND METHODS: Twenty patients with STEMI underwent CMR with a 1...
March 1, 2017: Medicina
https://www.readbyqxmd.com/read/28275592/model-of-human-fetal-growth-in-hypoplastic-left-heart-syndrome-reduced-ventricular-growth-due-to-decreased-ventricular-filling-and-altered-shape
#17
Sukriti Dewan, Adarsh Krishnamurthy, Devleena Kole, Giulia Conca, Roy Kerckhoffs, Michael D Puchalski, Jeffrey H Omens, Heather Sun, Vishal Nigam, Andrew D McCulloch
INTRODUCTION: Hypoplastic left heart syndrome (HLHS) is a congenital condition with an underdeveloped left ventricle (LV) that provides inadequate systemic blood flow postnatally. The development of HLHS is postulated to be due to altered biomechanical stimuli during gestation. Predicting LV size at birth using mid-gestation fetal echocardiography is a clinical challenge critical to prognostic counseling. HYPOTHESIS: We hypothesized that decreased ventricular filling in utero due to mitral stenosis may reduce LV growth in the fetal heart via mechanical growth signaling...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28265822/systematic-review-of-model-based-economic-evaluations-of-heart-valve-implantations
#18
Simone A Huygens, Johanna J M Takkenberg, Maureen P M H Rutten-van Mölken
OBJECTIVE: To review the evidence on the cost-effectiveness of heart valve implantations generated by decision analytic models and to assess their methodological quality. METHODS: A systematic review was performed including model-based cost-effectiveness analyses of heart valve implantations. Study and model characteristics and cost-effectiveness results were extracted and the methodological quality was assessed using the Philips checklist. RESULTS: Fourteen decision-analytic models regarding the cost-effectiveness of heart valve implantations were identified...
March 6, 2017: European Journal of Health Economics: HEPAC: Health Economics in Prevention and Care
https://www.readbyqxmd.com/read/28258847/percutaneous-edge-to-edge-mitral-valve-repair-for-the-treatment-of-acute-mitral-regurgitation-complicating-myocardial-infarction-a-single-centre-experience
#19
Marianna Adamo, Salvatore Curello, Ermanna Chiari, Claudia Fiorina, Giuliano Chizzola, Marco Magatelli, Elisa Locantore, Giovanni Cuminetti, Carlo Lombardi, Aldo Manzato, Marco Metra, Federica Ettori
BACKGROUND: Limited evidence is available about MitraClip therapy in patients with acute mitral regurgitation (MR) complicating myocardial infarction (MI). METHODS AND RESULTS: Among 80 consecutive patients undergoing MitraClip treatment, 5 (6.3%) had been admitted for acute MI complicated by severe MR. Mean age was 73±6years and 3 were males. At the time of admission they were in cardiogenic shock (80%) or pulmonary oedema (20%), with severe MR, left ventricular dysfunction and pulmonary hypertension...
May 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28247433/mitral-valve-coaptation-and-its-relationship-to-late-diastolic-flow-a-color-doppler-and-vector-flow-map-echocardiographic-study-in-normal-subjects
#20
Mark V Sherrid, Josef Kushner, Georgiana Yang, Richard Ro
BACKGROUND: Three competing theories about the mechanism of mitral coaptation in normal subjects were evaluated by color Doppler and vector flow mapping (VFM): (1) beginning of ventricular (LV) ejection, (2) "breaking of the jet" of diastolic LV inflow, and (3) returning diastolic vortices impacting the leaflets on their LV surfaces. METHODS AND RESULTS: We analyzed 80 color Doppler frames and 320 VFM measurements. In all 20 normal subjects, coaptation occurred before LV ejection, 78±16 ms before onset...
March 1, 2017: Echocardiography
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