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https://www.readbyqxmd.com/read/28209176/infective-endocarditis-causing-mitral-valve-stenosis-a-rare-but-deadly-complication-a-case-report
#1
Michael A Hart, Gautam R Shroff
BACKGROUND: Infective endocarditis rarely causes mitral valve stenosis. When present, it has the potential to cause severe hemodynamic decompensation and death. There are only 15 reported cases in the literature of mitral prosthetic valve bacterial endocarditis causing stenosis by obstruction. This case is even more unusual due to the mechanism by which functional mitral stenosis occurred. CASE PRESENTATION: We report a case of a 23-year-old white woman with a history of intravenous drug abuse who presented with acute heart failure...
February 17, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28209171/integrated-strategy-for-in-vitro-characterization-of-a-bileaflet-mechanical-aortic-valve
#2
Francesca Maria Susin, Stefania Espa, Riccardo Toninato, Stefania Fortini, Giorgio Querzoli
BACKGROUND: Haemodynamic performance of heart valve prosthesis can be defined as its ability to fully open and completely close during the cardiac cycle, neither overloading heart work nor damaging blood particles when passing through the valve. In this perspective, global and local flow parameters, valve dynamics and blood damage safety of the prosthesis, as well as their mutual interactions, have all to be accounted for when assessing the device functionality. Even though all these issues have been and continue to be widely investigated, they are not usually studied through an integrated approach yet, i...
February 16, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28185172/-18-f-fdg-pet-ct-angiography-for-the-diagnosis-of-infective-endocarditis
#3
REVIEW
A Roque, M N Pizzi, H Cuéllar-Calàbria, S Aguadé-Bruix
PURPOSE OF REVIEW: This article reviews the current imaging role of (18)F-fluordeoxyglucose positron emission computed tomography ((18)F-FDG-PET/CT) combined with cardiac CT angiography (CTA) in infective endocarditis and discusses the strengths and limitations of this technique. RECENT FINDINGS: The diagnosis of infective endocarditis affecting prosthetic valves and intracardiac devices is challenging because echocardiography and, therefore, the modified Duke criteria have well-recognized limitations in this clinical scenario...
February 2017: Current Cardiology Reports
https://www.readbyqxmd.com/read/28183438/cardiac-imaging-for-assessing-low-gradient-severe-aortic-stenosis
#4
REVIEW
Marie-Annick Clavel, Ian G Burwash, Philippe Pibarot
Up to 40% of patients with aortic stenosis (AS) harbor discordant Doppler-echocardiographic findings, the most common of which is the presence of a small aortic valve area (≤1.0 cm(2)) suggesting severe AS, but a low gradient (<40 mm Hg) suggesting nonsevere AS. The purpose of this paper is to present the role of multimodality imaging in the diagnostic and therapeutic management of this challenging entity referred to as low-gradient AS. Doppler-echocardiography is critical to determine the subtype of low-gradient AS: that is, classical low-flow, paradoxical low-flow, or normal-flow...
February 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28183423/recurrent-early-prosthetic-valve-endocarditis-caused-by-streptococcus-dysgalactiae-subspecies-equisimilis
#5
Sumit Som, Tatyana Danilov, John Puskas, Dennis Finkielstein
No abstract text is available yet for this article.
February 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28168964/surgical-versus-medical-therapy-for-prosthetic-valve-endocarditis-a%C3%A2-meta-analysis-of-32-studies
#6
REVIEW
Christos G Mihos, Romain Capoulade, Evin Yucel, Michael H Picard, Orlando Santana
Prosthetic valve endocarditis (PVE) is associated with significant morbidity, and the optimal treatment strategy has not been clearly defined. A systematic review and meta-analysis of 32 studies comparing valve reoperation and medical therapy was performed; it included 2,636 patients, with a mean follow-up of 22 months. A valve reoperation was associated with a lower risk of 30-day mortality, greater survival at follow-up, and a similar rate of PVE recurrence. Prospective studies are warranted to confirm these findings and to clarify clinical decision-making regarding the timing and necessity of a valve reoperation, as opposed to treatment with medical therapy alone...
February 3, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28167695/interventional-repair-of-pseudoaneurysm-of-ascending-aorta-following-prosthetic-aortic-valve-replacement
#7
Amer Harky, Amir Khosravi, Jonathan Colledge, Shyamsunder Kolvekar
No abstract text is available yet for this article.
February 6, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28157747/cardioembolic-stroke
#8
Cumara B O'Carroll, Kevin M Barrett
PURPOSE OF REVIEW: Cardioembolic stroke is common and disproportionately more disabling than nonembolic mechanisms of stroke. Its incidence is expected to rise because of the age-related incidence of atrial fibrillation and an aging population. This article summarizes the different causes of cardioembolism and outlines current management guidelines. RECENT FINDINGS: Since cardioembolic stroke is not a single disease entity, its diagnosis requires initial clinical suspicion and a comprehensive evaluation, including ECG, echocardiography, brain imaging, and cardiac monitoring...
February 2017: Continuum: Lifelong Learning in Neurology
https://www.readbyqxmd.com/read/28157718/in-vitro-comparative-assessment-of-decellularized-bovine-pericardial-patches-and-commercial-bioprosthetic-heart-valves
#9
Paola Aguiari, Laura Iop, Francesca Favaretto, Cátia Marisa Lourenco Fidalgo, Filippo Naso, Gabriella Milan, Vincenzo Vindigni, Michel Spina, Franco Bassetto, Andrea Bagno, Roberto Vettor, Gino Gerosa
Notwithstanding their wide exploitation, biological prosthetic heart valves are characterized by limited durability (10-15 years). The treatment of biological tissues with chemical crosslinking agents such as glutaraldehyde accounts for the enhanced risk of structural deterioration associated with the early failure of bioprosthetic valves. To overcome the shortcomings of the currently available solutions, adoption of decellularized biological tissues of animal origin has emerged as a promising approach. The present study aims to assess in vitro cardiovascular scaffolds composed of bovine pericardium decellularized with the novel TRITDOC (TRIton-X100 and TauroDeOxyCholic acid) procedure...
February 3, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28151005/allograft-heart-valves-current-aspects-and-future-applications
#10
Milan Lisy, Guenay Kalender, Katja Schenke-Layland, Kelvin G M Brockbank, Anna Biermann, Ulrich Alfred Stock
Human heart valve allografts continue to represent almost perfect substitutes for heart valves. They have optimal hemodynamic characteristics and are highly resistant to infections. The first clinical use of allograft heart valves was as homovitals being transplanted after antibiotic incubation without any preservation. Since 1968, relatively standardized frozen cryopreservation (SFC) has been employed, including storage in vapor-phase liquid nitrogen. Disadvantages, particularly in pediatric patients, are limited availability due to organ scarcity, inability to grow, degeneration, immune response, and long-term failure...
February 2, 2017: Biopreservation and Biobanking
https://www.readbyqxmd.com/read/28145613/care-in-the-uk-for-pregnant-women-with-mechanical-prosthetic-valves-needs-urgent-improvement
#11
M Cauldwell, P J Steer
No abstract text is available yet for this article.
February 1, 2017: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28143800/right-ventricular-outflow-tract-endocarditis-caused-by-brucellosis
#12
Feridoun Sabzi, Aghighe Heidari, Reza Faraji
Right-ventricular outflow tract (RVOT) endocarditis is a very rare presentation of right-sided infective endocarditis (RSIE) by brucellosis. RSIE occurs most commonly in immune-suppressed cases and illicit drug abuser. The patients with RSIE and an incompetent immune system usually have a prosthetic foreign body in blood circulation such as catheter, pacemakers, or central venous lines and may be accompanied with tricuspid or pulmonary valve dysfunction. The most common site for RSIE is the tricuspid valve...
January 29, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28131425/evaluation-of-hemodynamic-performance-of%C3%A2-aortic-valve-bioprostheses-in-a-model-of%C3%A2-oversizing
#13
John D Cleveland, Michael E Bowdish, Carol E Eberhardt, Wendy J Mack, James A Crabtree, Thomas A Vassiliades, Alan M Speir, Yogesh A Darekar, Amy E Hackmann, Vaughn A Starnes, Robbin G Cohen
BACKGROUND: The risk of patient-prosthesis mismatch drives most surgeons to select the largest bioprosthesis possible during aortic valve replacement, but interactions between the native aortic annulus and valve prosthesis remain poorly defined. We examined the hemodynamic and functional consequences of oversizing contemporary bioprostheses in an in vitro model. METHODS: Three sizes each (21, 23, and 25 mm) of 5 aortic bioprostheses (Magna, Edwards Lifesciences, Irvine, CA; Trifecta and Epic, St...
January 25, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28127212/the-effects-of-ramadan-fasting-on-patients-with-prosthetic-heart-valve-taking-warfarin-for-anticoagulation
#14
Muhammad O Awiwi, Zeynep Aslan Yagli, Ferruh Elbir, Ahmet Arif Aglar, Erhan Guler, Unsal Vural
INTRODUCTION: Oral anticoagulation with warfarin is indicated for patients with prosthetic heart valves. The effects of religious fasting during Ramadan month (in the Islamic calendar) on anticoagulation aren't clear. OBJECTIVES: To study the impact of Ramadan fasting on international normalized ratio (INR), quality of anticoagulation, dose of warfarin used and blood osmolarity. METHODS: 18 patients were followed-up prospectively for 3 months (pre- Ramadan, Ramadan and post-Ramadan months)...
January 2017: Journal of the Saudi Heart Association
https://www.readbyqxmd.com/read/28118978/the-impact-of-imperfect-frame-deployment-and-rotational-orientation-on-stress-within-the-prosthetic-leaflets-during-transcatheter-aortic-valve-implantation
#15
Jonathon Bailey, Nick Curzen, Neil W Bressloff
TAVI devices are manufactured with cylindrical frames. However, the frames are rarely cylindrical post-deployment since deformation due to localised under expansion can be induced by calcified material on the native valve leaflets exerting irregular forces upon the frame. Consequently, the leaflets within a deformed TAVI device may undergo elevated stress during operation, which may lead to premature device failure. Using computational analysis a complete TAVI device model was simulated undergoing deployment into an aortic root model derived from CT data for a patient with severe calcific aortic stenosis, followed by a pressure simulated cardiac cycle...
December 29, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28118782/initial-experience-with-xenograft-bioconduit-for-the-treatment-of-complex-prosthetic-valve-endocarditis
#16
Apostolos Roubelakis, Dimos Karangelis, Syed Sadeque, Bobby Yanagawa, Amit Modi, Clifford W Barlow, Steven A Livesey, Sunil K Ohri
INTRODUCTION: The treatment of complex prosthetic valve endocarditis (PVE) with aortic root abscess remains a surgical challenge. Several studies support the use of biological tissues to minimize the risk of recurrent infection. We present our initial surgical experience with the use of an aortic xenograft conduit for aortic valve and root replacement. METHODS: Between October 2013 and August 2015, 15 xenograft bioconduits were implanted for complex PVE with abscess (13...
January 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28118180/transcatheter-treatment-of-complex-malfunction-of-tricuspid-valve-prosthesis
#17
Giuseppe Santoro, Giancarlo Scognamiglio, Maria T Palladino, Heba T Mahmoud, Maria G Russo
A 45-year-old man with Ebstein anomaly of the tricuspid valve, previously submitted for tricuspid valve replacement and plication of the atrialized part of the right ventricle, was referred because of signs of increased systemic venous pressure and low output symptoms. Clinical picture was due to severe prosthetic valve stenosis and significant paravalvular regurgitation across an aneurismal dilatation of the atrialized right ventricle. A combined transcatheter approach by Melody valve implantation and Amplatzer Vascular Plug occlusion of the paravalvular leak completely relieved the hemodynamic and clinical findings...
January 23, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28117248/characteristics-aetiological-spectrum-and-management-of-valvular-heart-disease-in-a-tunisian-cardiovascular-centre
#18
Faten Triki, Jihen Jdidi, Dorra Abid, Nada Tabbabi, Selma Charfeddine, Sahar Ben Kahla, Mourad Hentati, Leila Abid, Samir Kammoun
BACKGROUND: Valvular heart diseases occur frequently in Tunisia, but no precise statistics are available. AIM: To analyse the characteristics of patients with abnormal valvular structure and function, and to identify the aetiological spectrum, treatment and outcomes of valvular heart disease in a single cardiovascular centre in Tunisia. METHODS: This retrospective study included patients with abnormal valvular structure and function, who were screened by transthoracic echocardiography at a single cardiology department between January 2010 and December 2013...
January 20, 2017: Archives of Cardiovascular Diseases
https://www.readbyqxmd.com/read/28109558/choice-of-balloon-expandable-versus-self-expanding-transcatheter-aortic-valve-impacts-hemodynamics-differently-according-to-aortic-annular-size
#19
Toby Rogers, Arie Steinvil, Jiaxiang Gai, Rebecca Torguson, Edward Koifman, Sarkis Kiramijyan, Smita Negi, Sang Yeub Lee, Petros Okubagzi, Lowell F Satler, Itsik Ben-Dor, Augusto D Pichard, Ron Waksman
We sought to determine whether balloon-expandable valve (BEV) and self-expanding valve (SEV) affect valve hemodynamics differently according to native aortic annulus size. Transcatheter aortic valve replacement can achieve superior prosthetic valve hemodynamics compared with surgical aortic valve replacement, particularly in patients with small aortic annulus. One hundred ninety-three consecutive transcatheter aortic valve replacement patients were grouped into tertiles defined by computed tomography derived aortic annulus systolic perimeter...
December 18, 2016: American Journal of Cardiology
https://www.readbyqxmd.com/read/28099247/hypercoagulability-during-resternotomy-for-prosthetic-valve-endocarditis
#20
Andrew L Wilkey, Judah A Askew, Robert S Farivar, Tjorvi E Perry
No abstract text is available yet for this article.
January 18, 2017: Anesthesiology
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