Read by QxMD icon Read

Prosthetic Valve

David Hasler, Dominik Obrist
The flow field past a prosthetic aortic valve comprises many details that indicate whether the prosthesis is functioning well or not. It is, however, not yet fully understood how an optimal flow scenario would look, i.e. which subtleties of the fluid dynamics in place are essential regarding the durability and compatibility of a prosthetic valve. In this study, we measured and analyzed the 3D flow field in the vicinity of a bio-prosthetic heart valve in function of the aortic root size. The measurements were conducted within aortic root phantoms of different size, mounted in a custom-built hydraulic setup, which mimicked physiological flow conditions in the aorta...
2018: PloS One
Philipp Marx, Wojciech Kowalczyk, Aydin Demircioglu, Gary Neil Brault, Hermann Wendt, Sharaf-Eldin Shehada, Konstantinos Tsagakis, Mohamed El Gabry, Heinz Jakob, Daniel Wendt
The aim of the present in vitro study was the evaluation of the fluid dynamical performance of the Carpentier-Edwards PERIMOUNT Magna Ease depending on the prosthetic size (21, 23, and 25 mm) and the cardiac output (3.6-6.4 L/min). A self-constructed flow channel in combination with particle image velocimetry (PIV) enabled precise results with high reproducibility, focus on maximal and local peek velocities, strain, and velocity gradients. These flow parameters allow insights into the generation of forces that act on blood cells and the aortic wall...
2018: BioMed Research International
Toshinari Onishi, Kaoruko Sengoku, Yasuhiro Ichibori, Isamu Mizote, Koichi Maeda, Toru Kuratani, Yoshiki Sawa, Yasushi Sakata
Transcatheter aortic valve implantation (TAVI) is an effective and less invasive treatment for the increasing population of individuals with severe aortic stenosis (AS). Echocardiography is crucial in the assessment of AS patients from pre- to post-procedure. Transthoracic echocardiography (TTE) may be used to assess patient suitability for TAVI, as well as evaluate the severity of AS, the aortic valve complex, aortic valve morphology, mitral regurgitation (MR), and left ventricular function. Transesophageal echocardiography (TEE) is usually used as an intra-procedural monitoring tool to provide feedback during the procedure, to assess prosthetic valve function, and to detect complications rapidly before and after balloon aortic valvuloplasty (BAV) or transcatheter heart valve (THV) deployment...
February 2018: Cardiovascular Diagnosis and Therapy
Arnaud Bisson, Alexandre Bodin, Nicolas Clementy, Anne Bernard, Dominique Babuty, Gregory Y H Lip, Laurent Fauchier
AIMS: We compared thromboembolic (TE) and bleeding risks in patients with atrial fibrillation (AF) according to the new 'Evaluated Heartvalves, Rheumatic or Artificial' (EHRA) valve classification. METHODS: Patients were divided into 3 categories: (i) EHRA type 1 corresponds to the previous 'valvular' AF patients, with either rheumatic mitral valve stenosis or mechanical prosthetic heart valves; (ii) EHRA type 2 includes AF patients with other valvular heart disease (VHD) and valve bioprosthesis or repair; and (iii) 'non-VHD controls' i...
March 7, 2018: International Journal of Cardiology
Tufan Çınar, Mert Ilker Hayıroğlu, Veysel Ozan Tanık, Emre Aruğaslan, Muhammed Keskin, Mahmut Uluganyan, Ahmet Öz, Metin Çağdaş, Ahmet Taha Alper
Prosthetic valve thrombosis (PVT) is a potentially life-threatening complication associated with high morbidity and mortality. The CHA2DS2-VASc is a clinical score used to determine thromboembolism risk in non-valvular atrial fibrillation patients. Therefore; in this study, we aimed to determine predictive value of the CHA2DS2-VASc score for development of PVT in patients with mechanical prosthetic valve. This was a retrospective study included 417 consecutive patients with mechanic prosthetic valve in whom transesophageal echocardiography (TEE) was performed due to different clinical indications from January 2004 to June 2016...
March 9, 2018: Journal of Thrombosis and Thrombolysis
Amnon Eitan, Julian Witt, Jan Stripling, Timo Haselbach, Friedrich-Christian Rieß, Joachim Schofer
BACKGROUND: Evolut-R 34 mm (received CE mark in January 2017) and Sapien-3 29 mm are the only options for transcatheter aortic valve replacement (TAVR) in patients with annulus ≥26 mm. We compared the short-term outcomes of these valves in these patients. METHODS: Data was collected prospectively from consecutive patients with severe aortic stenosis and annulus diameter larger than 26 mm treated by femoral approach TAVR. RESULTS: Between February 1, 2014 to August 19, 2017 Sapien-3 29 mm was implanted in 55 and Evolut-R 34 mm in 37 consecutive patients...
March 9, 2018: Catheterization and Cardiovascular Interventions
Hoda Hatoum, Jennifer Dollery, Scott M Lilly, Juan A Crestanello, Lakshmi Prasad Dasi
BACKGROUND: This study aims to evaluate the effect of transcatheter aortic valve (TAV) implantation depth and rotation on pressure gradient (PG), leakage fractions (LF), leaflet shear stress and sinus washout in an effort to understand factors that may dictate optimal positioning for valve-in-valve (ViV) procedures. Sinus flow stasis is often associated with prosthetic leaflet thrombosis. While recent ViV in-vitro studies highlighted transcatheter aortic valve (TAV) supra-annular implantation potential benefits to minimize pressure gradients, the relationship between TAV depth and other determinates of valve function remains unknown...
March 1, 2018: Annals of Thoracic Surgery
Markus Bongert, Marius Geller, Werner Pennekamp, Volkmar Nicolas
Diseases of the cardiovascular system account for nearly 42% of all deaths in the European Union. In Germany, approximately 12,000 patients receive surgical replacement of the aortic valve due to heart valve disease alone each year. A three-dimensional (3D) numerical model based on patient-specific anatomy derived from four-dimensional (4D) magnetic resonance imaging (MRI) data was developed to investigate preoperatively the flow-induced impact of mounting positions of aortic prosthetic valves to select the best orientation for individual patients...
March 3, 2018: Biomedizinische Technik. Biomedical Engineering
S Aguadé Bruix, A Roque Pérez, H Cuéllar Calabria, M N Pizzi
Infective endocarditis (IE) is a serious pathology with a poor prognosis, whose mortality has not changed significantly despite advances in its diagnosis and treatment in the last 30years. The diagnostic capacity of the modified Duke criteria in prosthetic endocarditis and/or devices does not exceed 50%, so new tools are necessary for the diagnosis of this entity in this context. The18 F-FDG PET/CTA combines a highly sensitive technique to detect inflammatory-infectious activity and a technique with high anatomical resolution to assess the structural lesions associated with endocarditis...
February 26, 2018: Revista Española de Medicina Nuclear e Imagen Molecular
Ayumi Koga, Ken Okamoto, Hirokazu Tazume, Toshihiro Fukui
Antiphospholipid syndrome is a rare autoimmune disease with a hypercoagulable state causing vascular thrombosis. We present the case of a 42-year old female who underwent mitral valve replacement with a mechanical valve 15 months ago. The postoperative course was uneventful, and echocardiography performed 14 months postoperatively showed good valve function. The patient developed sudden dyspnea 15 months postoperatively and was referred to our hospital. Echocardiography revealed mitral stenosis with stuck leaflets...
January 31, 2018: Heart Surgery Forum
Haruo Yamauchi, Minoru Ono
Aortic root replacement with a cryopreserved allograft aortic valve is effective for active infectious endocarditis and prosthetic valve endocarditis, especially with a perivalvular abscess, since an allograft seems to be resistant to infection by maintaining viable cells under the process of programmed freezing. From December 1998 to March 2017, aortic root replacement with allograft aortic valves were performed in 38 patients in the University of Tokyo. The in-hospital mortality was 18%, the 5-year survival rate was 68%, and the 5-year freedom rate of reoperation was 75%...
January 2018: Kyobu Geka. the Japanese Journal of Thoracic Surgery
Paula Mendonça Leite, Aline A de Freitas, Aline de O Magalhães Mourão, Maria A P Martins, Rachel O Castilho
OBJECTIVE: The aim of this study was to analyze factors associated with the consumption of medicinal plants by patients being treated with warfarin in a Brazilian anticoagulation clinic and to study the safety of medicinal plant use in patients on warfarin therapy. METHODS: The study was performed as an observational cross-sectional analysis. Study participants were outpatients on long-term warfarin therapy for at least 2 months for atrial fibrillation or prosthetic cardiac valves...
February 23, 2018: American Journal of Cardiovascular Drugs: Drugs, Devices, and Other Interventions
Daniel García-Arribas, Isidre Vilacosta, Aida Ortega Candil, Cristina Rodríguez Rey, Carmen Olmos, María Jesús Pérez Castejón, David Vivas, Carlos Nicolás Pérez-García, Manuel Carnero-Alcázar, Cristina Fernández-Pérez, Luis Maroto, José Luis Carreras
OBJECTIVE: Infection of valved aortic grafts is a rare entity whose diagnosis remains challenging. Positron emission tomography (PET)/CT has become a criterion for the diagnosis of infective endocarditis (IE) in prosthetic valves, but its role on ascending aortic graft infections remains unclear. This study aims to assess the diagnostic value of PET/CT in patients with valved aortic graft infection. METHODS: 12 episodes with a valved aortic graft who had undergone a PET/CT due to suspicion of IE were prospectively included (group I) and compared with five controls free of infection who underwent PET/CT for other reasons (group II)...
February 22, 2018: Heart: Official Journal of the British Cardiac Society
Candice Y Lee, Carl A Johnson, Juan A Siordia, Juan M Lehoux, Peter A Knight
OBJECTIVE: Aortic cross-clamp and cardiopulmonary bypass times are independent predictors of postoperative morbidity and mortality. Reducing ischemic times with automated titanium fasteners may improve surgical outcomes. This study compared operative times and costs of titanium fasteners versus hand-tied knots for prosthesis securement in open aortic valve replacement. METHODS: A randomized control trial was conducted during a 16-month period at a single university medical center...
February 21, 2018: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
Su Wan Kim, Dong Seop Jeong, Kiick Sung, Wook Sung Kim, Young Tak Lee, Pyo Won Park
BACKGROUND AND AIM OF THE STUDY: We evaluated the early and long-term outcomes of mitral annular reconstruction (MAR) with pericardium during mitral valve replacement (MVR), and analyzed the risk factors associated with post-operative mortality. METHODS: Between May 1997 and April 2013, 78 consecutive patients underwent MVR with MAR. The indications for MAR were treatment for annular infection in native valve endocarditis (n = 23, 29.5%) or prosthetic valve endocarditis (n = 26, 33...
February 20, 2018: Journal of Cardiac Surgery
Hyun Jung Koo, Hojin Ha, Joon-Won Kang, Jeong A Kim, Jae-Kwan Song, Hwa Jung Kim, Tae-Hwan Lim, Dong Hyun Yang
BACKGROUND: Although pannus is an important cause of prosthetic valve dysfunction, the minimum pannus size that can induce hemodynamic dysfunction has not yet been determined. This study investigated the correlation between the limitation of motion (LOM) of the prosthetic valve and pannus extent and determined the pannus extent that could induce severe aortic stenosis. METHODS: This study included 49 patients who underwent mechanical aortic valve replacement (AVR) and showed pannus on cardiac computed tomography (CT)...
February 19, 2018: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
Nagaraja Moorthy, Rajiv Ananthakrishna, Dattatreya P V Rao, Satvic C Manjunath, Manjunath C Nanjappa
Intermittent dysfunction of mechanical mitral valve prosthesis is an uncommon condition. It carries serious clinical implications if unrecognized. Here, we present a case of a 28-year-old female with a history of rheumatic multivalvular disease, for which she had undergone double valve replacement and tricuspid annuloplasty. Six months later, she presented with heart failure. Clinical examination revealed intermittent loss of closing clicks followed by a pansystolic murmur at the apex, suggestive of mitral prosthetic valve dysfunction...
March 2018: Echocardiography
Nurhayat Ozkan Sevencan, Serkan Bakirdogen, Adem Adar, Burcak Kayhan
Suttonella indologenes is a Gram-negative, aerobic coccobacillus of Cardiobacteriaceae family and its natural habitat is the mucous membranes of the upper respiratory system. The literature includes limited number of case reports concerning fatal endocarditis due to infection in the prosthetic heart valves caused by the aforementioned microorganism. However, there is no information on extracardiac involvement due to this microorganism. Here, we present a peritonitis case caused by Suttonella indologenes in a patient receiving continuous ambulatory peritoneal dialysis...
January 2018: Saudi Journal of Kidney Diseases and Transplantation
Bonou Maria, Tzanis Georgios, Viniou Nora-Athina, Biliou Smaragda, Barbetseas John
No abstract text is available yet for this article.
February 13, 2018: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
Eleanor Snape, Jecko Thachil, Bernard Clarke, Sarah Vause
No abstract text is available yet for this article.
February 13, 2018: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"