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Mechanical mitral

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https://www.readbyqxmd.com/read/29666072/left-ventricular-assist-device-inflow-cannula-angle-and-thrombosis-risk
#1
Venkat Keshav Chivukula, Jennifer A Beckman, Anthony R Prisco, Todd Dardas, Shin Lin, Jason W Smith, Nahush A Mokadam, Alberto Aliseda, Claudius Mahr
BACKGROUND: As heart failure prevalence continues to increase in the setting of a static donor supply, left ventricular assist device (LVAD) therapy for end-stage heart failure continues to grow. Anecdotal evidence suggests that malalignment of the LVAD inflow cannula may increase thrombosis risk, but this effect has not been explored mechanistically or quantified statistically. Our objective is to elucidate the impact of surgical angulation of the inflow cannula on thrombogenicity. METHODS AND RESULTS: Unsteady computational fluid dynamics is used in conjunction with computational modeling and virtual surgery to model flow through the left ventricle for 5 different inflow cannula angulations...
April 2018: Circulation. Heart Failure
https://www.readbyqxmd.com/read/29655822/clinical-spectrum-and-management-of-heart-failure-in-hypertrophic-cardiomyopathy
#2
REVIEW
Barry J Maron, Ethan J Rowin, James E Udelson, Martin S Maron
Heart failure (HF), characterized by excessive exertional dyspnea, is a common complication within the broad clinical spectrum of hypertrophic cardiomyopathy (HCM). HF has become an increasingly prominent management issue with the reduction in sudden deaths due to use of implantable defibrillators in this disease. Exertional dyspnea ranges in severity from mild to severe (New York Heart Association functional classes II to IV) and not uncommonly becomes refractory to medical management, leading to progressive disability, but largely in the absence of pulmonary congestion and volume overload requiring hospitalization...
April 5, 2018: JACC. Heart Failure
https://www.readbyqxmd.com/read/29644046/mitral-valve-replacement-for-libman-sacks-endocarditis-in-a-patient-with-antiphospholipid-syndrome-secondary-to-systemic-lupus-erythematosus
#3
Akio Nakasu, Tohru Ishimine, Hiroshi Yasumoto, Toshiho Tengan, Hidemitsu Mototake
Libman-Sacks endocarditis is a relatively rare sterile verrucous vegetative lesion observed in systemic lupus erythematosus (SLE)/antiphospholipid syndrome (APLS) patients. Most patients with this condition are asymptomatic. Here we report a case of a 46-year-old woman with APLS secondary to SLE complicated with frequent thromboembolic events due to a mitral valve mass. We performed minimally invasive mitral valve replacement with a mechanical prosthetic valve, and she was successfully discharged 14 days after surgery...
April 2018: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/29627779/low-dose-warfarin-maternal-anticoagulation-and-fetal-warfarin-syndrome
#4
Ana R Sousa, Rita Barreira, Edmundo Santos
Fetuses exposed to warfarin during pregnancy are at an increased risk of developing an embryopathy known as fetal warfarin syndrome or warfarin embryopathy. The most consistent anomalies are nasal hypoplasia and stippling of vertebrae or bony epiphyses. Management of pregnant patients on anticoagulation is challenging. Current guidelines suggest the use of warfarin if the therapeutic dose is ≤5 mg/day. We report the case of a newborn with signs of warfarin embryopathy born from a mother anticoagulated with warfarin due to mechanical mitral and aortic heart valves...
April 7, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29626079/acute-versus-chronic-ischemic-mitral-regurgitation-an-echocardiographic-study-of-anatomy-and-physiology
#5
Shun Nishino, Nozomi Watanabe, Toshiyuki Kimura, Nehiro Kuriyama, Yoshisato Shibata
BACKGROUND: Little is known on the mechanism of acute ischemic mitral regurgitation (IMR) caused by sudden-onset left ventricular dysfunction in acute myocardial infarction (MI). We sought to investigate the mitral valve (MV) complex geometry in acute IMR in comparison with chronic IMR by 2-dimensional and 3-dimensional transthoracic echocardiography. METHODS AND RESULTS: Forty-four first-onset acute MI and 36 previous MI with ≥moderate IMR were examined by 2-dimensional/3-dimensional transthoracic echocardiography...
April 2018: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29623986/transcatheter-mitral-valve-intervention-an-emerging-treatment-for-mitral-regurgitation
#6
Ryan Markham, Stephen Kyranis, Nicholas Aroney, Katherine Lau, Karl Poon, Gregory Scalia, Darren Walters
Mitral regurgitation (MR) is a valvular heart disease associated with significant morbidity and mortality. Transcatheter mitral valve intervention (TMVI) repairs or replaces the mitral valve through small arterial and venous entry sites and so avoids risks associated with open heart surgery. Transcatheter devices targeting components of the mitral apparatus are being developed to repair or replace it. Numerous challenges remain including developing more adaptable devices and correction of multiple components of the mitral annulus to attain durable results...
April 2018: Internal Medicine Journal
https://www.readbyqxmd.com/read/29617819/impact-of-valve-type-on-outcomes-after-redo-mitral-valve-replacement-in-patients-aged-50-to-69-years
#7
Naoto Fukunaga, Chisato Miyakoshi, Ryuzo Sakata, Tadaaki Koyama
OBJECTIVES: Little data are available with regard to valve selections in redo valvular surgery. We investigated the impact of valve types on late outcomes after redo mitral valve replacement (MVR). METHODS: We retrospectively reviewed 66 patients aged 50-69 (mean age 62.2 ± 5.1)  years who underwent redo MVR over the past 25 years. In redo MVR, 46 (69.7%) redo procedures were the 1st redo valvular surgeries, 16 (24.2%) were 2nd redos, 3 (4.5%) were 3rd redos and 1 was a 4th (1...
March 29, 2018: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29617499/mortality-predictors-in-the-surgical-treatment-of-active-infective-endocarditis
#8
Jenny Lourdes Rivas de Oliveira, Magaly Arrais Dos Santos, Renato Tambellini Arnoni, Auristela Ramos, Dorival Della Togna, Samira Kaissar Ghorayeb, Roberto Tadeu Magro Kroll, Luiz Carlos Bento de Souza
INTRODUCTION: Active infective endocarditis is associated with high morbidity and mortality. Surgery is indicated in high-risk conditions, and the main determinants of mortality in surgical treatment should be evaluated. OBJECTIVE: To identify mortality predictors in the surgical treatment of active infective endocarditis in a long-term follow-up. METHODS: This prospective observational study involved 88 consecutive patients diagnosed with active infective endocarditis, who underwent surgery between January 2005 and December 2015...
January 2018: Brazilian Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/29616461/management-of-systolic-anterior-motion-of-the-mitral-valve-a-mechanism-based-approach
#9
REVIEW
Susumu Manabe, Hitoshi Kasegawa, Hirokuni Arai, Shuichiro Takanashi
Although the mechanism of systolic anterior motion (SAM) of the mitral valve is unknown, it is known to have a multifactorial pathophysiology. Echocardiographic analysis of the mitral leaflet revealed the step-wise progression of SAM, and intraventricular flow analysis revealed the contribution of drag force generated by the misled flow below the posterior leaflet. Although several diverse clinical features of SAM are already known, some key features need to be abstracted from among them to understand the regulation of SAM establishment...
April 3, 2018: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29608496/antithrombotic-management-of-patients-with-prosthetic-heart-valves
#10
Abdallah Sanaani, Srikanth Yandrapalli, Joseph Michael Harburger
Valvular heart disease is a major public health issue. The prevalence of valvular heart disease is expected to increase due to an aging population. Valve dysfunction manifests as valve stenosis, regurgitation, or both, due to various etiologies. Valve repair and replacement are the main treatment options for severe valve dysfunction. Valve replacement is achieved by using either a mechanical or a bioprosthetic valve. Mechanical valves are more durable but require lifelong anticoagulation with associated complications...
March 30, 2018: Cardiology in Review
https://www.readbyqxmd.com/read/29608495/medical-management-of-rheumatic-heart-disease-a-systematic-review-of-the-evidence
#11
E Anne Russell, Warren F Walsh, Ben Costello, Alex Ja McLellan, Alex Brown, Christopher M Reid, Lavinia Tran, Graeme P Maguire
Rheumatic heart disease (RHD) is an important cause of heart disease globally. Its management can encompass medical and procedural (catheter and surgical) interventions. Literature pertaining to the medical management of RHD from PubMed 1990-2016 and via selected article reference lists was reviewed. Areas included symptom management, left ventricular (LV) dysfunction, rate control in mitral stenosis (MS), atrial fibrillation (AF), anticoagulation, infective endocarditis prophylaxis and management in pregnancy...
March 30, 2018: Cardiology in Review
https://www.readbyqxmd.com/read/29606334/apical-transverse-motion-is-associated-with-interventricular-mechanical-delay-and-decreased-left-ventricular-function-in-children-with-dilated-cardiomyopathy
#12
Wei Hui, Cameron Slorach, Mark K Friedberg
BACKGROUND: Apical transverse motion (ATM) is associated with electromechanical dyssynchrony in adult dilated cardiomyopathy (DCM). Bundle branch block electromechanical dyssynchrony is uncommon in pediatric DCM, but ATM and its association with ventricular function have not been characterized. METHODS: Fifty-six children with DCM were retrospectively studied. Using echocardiography, ATM was assessed visually and by speckle-tracking longitudinal displacement of the interventricular septal and left ventricular (LV) lateral walls in opposite directions...
March 29, 2018: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29572837/cholecystokinin-selectively-activates-short-axon-cells-to-enhance-inhibition-of-olfactory-bulb-output-neurons
#13
Xiang Liu, Shaolin Liu
Neuropeptides including cholecystokinin (CCK) are important for many brain functions including sensory processing. CCK is predominantly present in a subpopulation of excitatory neurons and activation of CCK receptors is implicated in olfactory signal processing in the olfactory bulb (OB). However, cellular and circuit mechanisms underlying CCK actions in the OB remain elusive. Here we characterized CCK effects on synaptic inhibition of the principal OB output neurons mitral/tufted cells (MTCs) followed by mechanistic analyses at the circuit and cellular levels with the following findings...
March 23, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29572082/correlation-of-tricuspid-regurgitation-and-new-pacemaker-implantation-in-patients-undergoing-transcatheter-aortic-valve-implantation
#14
Dimitry Schewel, Jury Schewel, Michael Schlüter, Felix Kreidel, Tobias Schmidt, Michael Schmoeckel, Albrecht Elsässer, Karl-Heinz Kuck, Christian Frerker
AIMS: Conduction abnormalities (CA), in particular complete atrioventricular block (CAVB), requiring permanent pacemaker (PPM) implantation, are frequent complications after transcatheter aortic valve implantation (TAVI) in patients with severe aortic stenosis (AS). However, the potential mechanisms are still incompletely understood. The objective of this retrospective study was to determine further predictors of CAVB after TAVI in patients without the known predictors. METHODS AND RESULTS: This study included patients without prior CA/PPM who underwent TAVI of a balloon-expandable valve (Sapien or Sapien XT or Sapien 3)...
March 13, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29572021/a-novel-tissue-treatment-to-reduce-mineralization-of-bovine-pericardial-heart-valves
#15
Bart Meuris, Herbert De Praetere, Marina Strasly, Piero Trabucco, John C Lai, Peter Verbrugghe, Paul Herijgers
OBJECTIVE: With the increasing use of bioprostheses worldwide, continuous efforts have been made to improve tissue durability. We introduce a new treatment for bovine pericardium combining octanediol-ethanol based phospholipid removal with taurine-based glutaraldehyde neutralization and storage in an aldehyde-free solution (FREE). METHODS: Treated tissues were evaluated by mechanical and biochemical characterization, phospholipid content, aldehyde levels, cell cultures on pericardial samples (L929 fibroblasts and human umbilical vein endothelial cells), rat subcutaneous implantations, and long-term juvenile sheep mitral valve implantations (n = 3)...
February 21, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29571348/first-surgical-melody-valve-in-valve-implantation-for-early-degeneration-in-mitral-position
#16
Maria Grandinetti, Alessandro Varrica, Alessandro Giamberti, Mario Carminati, Alessandro Frigiola
Congenital mitral valve disease is a real challenge in infants and small children. The implantation of expandable stented valves in mitral position has become one of the options of choice in consideration of their acceptable short-term expandable durability and subsequent feasibility of balloon expansion of these devices. We report the first case of a surgical Melody valve-in-valve procedure for early Melody valve degeneration in the mitral position. The result was good, and the procedure safe, rapid, and without an increased risk when a mechanical valve implantation will be necessary...
April 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29570208/sheep-can-be-used-as-animal-model-of-regional-myocardial-remodelling-and-controllable-work
#17
Jürgen Duchenne, Piet Claus, Efstathios D Pagourelias, Razvan O Mada, Joeri Van Puyvelde, Kathleen Vunckx, Eric Verbeken, Olivier Gheysens, Filip Rega, Jens-Uwe Voigt
BACKGROUND: A-V-sequential pacing has been shown to induce reversible conduction delay and subsequent asymmetric remodelling of the left ventricle (LV) in dogs and pigs. Both species have disadvantages in animal experiments. Therefore aim of this study focusses at developing a more feasible and easy-to-use animal model in sheep. METHODS: Dual-chamber pacing (DDD) pacemakers (right atrium + right ventricular free wall) were surgically implanted in 13 sheep. All animals underwent 8 weeks of chronic rapid pacing at 180 bpm...
March 23, 2018: Cardiology Journal
https://www.readbyqxmd.com/read/29563946/cardiac-function-associated-with-home-ventilator-care-in-duchenne-muscular-dystrophy
#18
Sangheun Lee, Heeyoung Lee, Lucy Youngmin Eun, Seung Woong Gang
Purpose: Cardiomyopathy is becoming the leading cause of death in patients with Duchenne muscular dystrophy because mechanically assisted lung ventilation and assisted coughing have helped resolve respiratory complications. To clarify cardiopulmonary function, we compared cardiac function between the home ventilator-assisted and non-ventilator-assisted groups. Methods: We retrospectively reviewed patients with Duchenne muscular dystrophy from January 2010 to March 2016 at Gangnam Severance Hospital...
February 2018: Korean Journal of Pediatrics
https://www.readbyqxmd.com/read/29556149/mechanical-mitral-valve-replacement-during-the-2nd-trimester-of-pregnancy
#19
Anas Boulemden, Gemma L Malin, Suzanne V F Wallace, Amr Mahmoud, William H T Smith, Adam A Szafranek
We report the case of a 44-year-old pregnant woman who was diagnosed with symptomatic severe mitral stenosis that did not respond to optimal medical therapy and balloon valvuloplasty. After a multidisciplinary team discussion on the timing and risks of interventions and postoperative optimization of peripartum anticoagulation, the patient underwent mechanical mitral valve replacement during the 2nd trimester of pregnancy. The outcome was excellent for the mother and the infant. This case emphasizes the importance of a multidisciplinary approach in managing unusual cases...
February 2018: Texas Heart Institute Journal
https://www.readbyqxmd.com/read/29548280/comprehensive-microrna-profiling-reveals-potential-augmentation-of-the-il1-pathway-in-rheumatic-heart-valve-disease
#20
Qiyu Lu, Yi Sun, Yuyin Duan, Bin Li, Jianming Xia, Songhua Yu, Guimin Zhang
BACKGROUND: Valvular heart disease is a leading cause of cardiovascular mortality, especially in China. More than a half of valvular heart diseases are caused by acute rheumatic fever. microRNA is involved in many physiological and pathological processes. However, the miRNA profile of the rheumatic valvular heart disease is unknown. This research is to discuss microRNAs and their target gene pathways involved in rheumatic heart valve disease. METHODS: Serum miRNA from one healthy individual and four rheumatic heart disease patients were sequenced...
March 16, 2018: BMC Cardiovascular Disorders
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