keyword
MENU ▼
Read by QxMD icon Read
search

Heart valve size

keyword
https://www.readbyqxmd.com/read/28734620/treatment-of-dogs-with-compensated-myxomatous-mitral-valve-disease-with-spironolactone-a-pilot-study
#1
M J Hezzell, A Boswood, J López-Alvarez, N Lötter, J Elliott
OBJECTIVES: Spironolactone improves outcome in dogs with advanced myxomatous mitral valve disease (MMVD). Its efficacy in preclinical MMVD is unknown. The hypothesis was the administration of spironolactone to dogs with compensated MMVD demonstrating risk factors for poorer prognosis will decrease the rate of disease progression. The aim was to provide pilot data to evaluate preliminary effects and sample size calculation for a definitive clinical trial. ANIMALS: Twenty-five client-owned dogs with MMVD with at least one of the following; left atrial to aortic ratio (LA:Ao) ≥ 1...
July 19, 2017: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/28728722/transcatheter-aortic-valve-replacement-a-review
#2
REVIEW
John H Braxton, Kelly S Rasmussen, Milind S Shah
Patients with inoperable, high-risk, and intermediate-risk aortic stenosis can now be treated with transcatheter aortic valve replacement. Centers for Medicare and Medicaid Services and the Food and Drug Administration selectively choose centers based on experience and require a collaborative, multidisciplinary team approach in the treatment and decision making for these patients. The work-up has been streamlined. Gated multislice computed tomography angiogram has emerged as the gold standard for assessment of valve anatomy and sizing of the transcatheter heart valve...
August 2017: Surgical Clinics of North America
https://www.readbyqxmd.com/read/28727703/intrathecal-morphine-improves-hemodynamic-parameters-and-analgesia-in-patients-undergoing-aortic-valve-replacement-surgery-a-prospective-double-blind-randomized-trial
#3
Hamed Elgendy, Hatem A R Helmy
BACKGROUND: Intrathecal morphine (ITM) has been used in hopes of providing good postoperative analgesia in cardiac surgery. Little is known about its use in isolated aortic valve replacement surgery. OBJECTIVES: To evaluate the effects of 7 µ/kg ITM administration in aortic valve replacement in regards to hemodynamics, pain score, and postoperative complications when compared to general anesthesia alone. STUDY DESIGN: A randomized, double-blind trial...
July 2017: Pain Physician
https://www.readbyqxmd.com/read/28724752/the-fluid-mechanics-of-transcatheter-heart-valve-leaflet-thrombosis-in-the-neo-sinus
#4
Prem A Midha, Vrishank Raghav, Rahul Sharma, Jose F Condado, Ikechukwu U Okafor, Tanya Rami, Gautam Kumar, Vinod H Thourani, Hasan Jilaihawi, Vasilis Babaliaros, Raj R Makkar, Ajit P Yoganathan
Background -Transcatheter heart valve (THV) thrombosis has been increasingly reported. In these studies, thrombus quantification has been based on 2D assessment of a 3D phenomenon. Methods -Post-procedural four-dimensional, volume-rendered CT (4DCT) data of CoreValve, Evolut R, and SAPIEN 3 transcatheter aortic valve replacement (TAVR) patients enrolled in the RESOLVE trial were included in this analysis. Patients on anticoagulation were excluded. SAPIEN 3 and CoreValve/Evolut R patients with and without hypo-attenuated leaflet thickening (HALT) were included in order to study differences between groups...
July 19, 2017: Circulation
https://www.readbyqxmd.com/read/28722138/a-red-blood-cell-model-to-estimate-the-hemolysis-fingerprint-of-cardiovascular-devices
#5
Riccardo Toninato, Giuseppe Fadda, Francesca Maria Susin
One of the most relevant and open issues within cardiovascular prosthetic hemodynamic performance is a realistic quantification of the damage sustained by red blood cells (RBCs). Specifically, the optimal design of bileaflet mechanical heart valves (BMHVs) requires both low shear stresses along the leaflets and short particle resident times. This study approaches RBC damage estimation by developing a numerical model of RBCs and computing the damage sustained by a set of passive RBCs immersed within in vitro flows...
July 19, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28702479/image-quality-and-contrast-agent-exposure-in-cardiac-computed-tomography-angiography-prior-to-transcatheter-aortic-valve-implantation-procedures-using-different-acquisition-protocols
#6
Nina P Hofmann, Moritz Schuetz, Raffi Bekeredjian, Sven Pleger, Emanuel Chorianopoulos, Sorin Giusca, Florian André, Gitsios Gitsioudis, Christopher Schlett, Hans-Ulrich Kauczor, Hugo A Katus, Grigorios Korosoglou
BACKGROUND: ECG-gated cardiac computed tomography angiography (CCTA) has found widespread use for prosthesis sizing before transcatheter aortic valve implantation (TAVI). However, still little data exists on the optimal scan-strategy in such patients. We hypothesized that prospectively triggered CCTA can enable the visualization of aortic valve structures and peripheral arteries with lower radiation and contrast agent exposure in patients considered for TAVI compared to retrospectively gated protocols...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/28696869/feasibility-of-biventricular-repair-in-right-dominant-unbalanced-atrioventricular-septal-defect-a-new-echocardiographic-metric-to-refine-surgical-decision-making
#7
Ignacio Lugones, María Fernanda Biancolini, Julio César Biancolini, Ana M S de Dios, Germán Lugones
BACKGROUND: Unbalanced forms of atrioventricular septal defect continue to be challenging and present poor surgical outcomes. Echocardiographic indicators such as atrioventricular valve index, right ventricle/left ventricle inflow angle, and size of the ventricular septal defect have been identified as relevant discriminators that may guide surgical strategy. Our purpose is to describe another metric to refine surgical decision-making. METHODS: We outline a geometrical description of the anatomic features of atrioventricular septal defect and describe equations that help explain the interplay between the main echocardiographic variables...
July 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28691909/fracturing-mechanics-before-valve-in-valve-therapy-of-small-aortic-bioprosthetic-heart-valves
#8
Peter Johansen, Henrik Engholt, Mariann Tang, Rasmus F Nybo, Per D Rasmussen, Jens Erik Nielsen-Kudsk
AIMS: Patients with degraded bioprosthetic heart valves (BHV) who are not candidates for valve replacement may benefit from transcatheter valve-in-valve (VIV) therapy. However, at smaller sized surgical BHV the resultant orifice may become too narrow. To overcome this, the valve frame can be fractured by a high-pressure balloon prior to VIV. However, knowledge on fracture pressures and mechanics are prerequisites. The aim of this study is to identify the fracture pressures needed in BHV, and to describe the fracture mechanics...
July 11, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28676926/the-infant-with-aortic-arch-hypoplasia-and-small-left-heart-structures-echocardiographic-indices-of-mitral-and-aortic-hypoplasia-predicting-successful-biventricular-repair
#9
Jennifer M Plymale, Peter C Frommelt, Melodee Nugent, Pippa Simpson, James S Tweddell, Amanda J Shillingford
In infants with aortic arch hypoplasia and small left-sided cardiac structures, successful biventricular repair is dependent on the adequacy of the left-sided structures. Defining accurate thresholds of echocardiographic indices predictive of successful biventricular repair is paramount to achieving optimal outcomes. We sought to identify pre-operative echocardiographic indices of left heart size that predict intervention-free survival in infants with small left heart structures undergoing primary aortic arch repair to establish biventricular circulation (BVC)...
July 4, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28666317/right-ventricular-and-tricuspid-valve-function-in-patients-chronically-implanted-with-leadless-pacemakers
#10
Erwan Salaun, Lilith Tovmassian, Blandine Simonnet, Roch Giorgi, Frédéric Franceschi, Linda Koutbi-Franceschi, Jérôme Hourdain, Gilbert Habib, Jean-Claude Deharo
Aims: Leadless cardiac pacing has recently been proposed as alternative to conventional right ventricular (RV) pacing. With this approach, devices are directly screwed or fixed with tines in the RV wall, but the possible consequences on RV and tricuspid valve (TV) structure and function remain unknown. We thus conducted a study to evaluate this potential impact in chronically implanted patients. Methods and results: Repeated echocardiographic studies were performed prior to implantation, at discharge, and 2 months thereafter on all consecutive patients implanted with a leadless pacemaker at our centre between October 2014 and end-December 2015...
June 28, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28653340/aortic-perfusion-score-for-pulmonary-atresia-with-intact-ventricular-septum-an-antegrade-coronary-perfusion-scoring-system-that-is-predictive-of-need-for-transplant-and-mortality
#11
Rohit S Loomba, Andrew N Pelech
BACKGROUND: Pulmonary atresia with intact ventricular septum is a unique congenital malformation of the heart in which patients may undergo single-, two- or 1½- ventricle repair. Size of the tricuspid valve annulus, morphology of the right ventricle and presence of ventriculocoronary connections can all impact the selection of appropriate palliative strategy. We developed the aortic perfusion score, a novel scoring system based on anterograde coronary perfusion with the aim of being able to identify patients at risk for death or transplant...
June 27, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28645796/preclinical-testing-of-frequency-tunable-capacitive-micromachined-ultrasonic-transducer-probe-prototypes
#12
Martin Pekař, Alexander F Kolen, Harm Belt, Frank van Heesch, Nenad Mihajlović, Imo E Hoefer, Tamas Szili-Török, Hendrik J Vos, Johan G Bosch, Gijs van Soest, Antonius F W van der Steen
In intracardiac echocardiography (ICE) it may be beneficial to generate ultrasound images acquired at multiple frequencies, having the possibility of high penetration or high-resolution imaging in a single device. The objective of the presented work is to test two frequency-tunable probe prototypes in a preclinical setting: a rigid probe having a diameter of 11 mm and a new flexible and steerable 12-Fr ICE catheter. Both probes feature a forward-looking 32-element capacitive micromachined ultrasonic transducer array (aperture of 2 × 2 mm(2)) operated in collapse mode, which allows for frequency tuning in the 6-MHz-18-MHz range...
June 20, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28626146/mitral-valve-structure-in-addition-to-myocardial-viability-determines-the-outcome-of-functional-mitral-regurgitation-after-coronary-artery-bypass-grafting
#13
Shohei Yoshida, Satsuki Fukushima, Shigeru Miyagawa, Teruya Nakamura, Yasushi Yoshikawa, Hiroki Hata, Shunsuke Saito, Daisuke Yoshioka, Keitaro Domae, Noriyuki Kashiyama, Kouji Yamamoto, Ayumi Shintani, Satoshi Nakatani, Koichi Toda, Yoshiki Sawa
BACKGROUND: Coronary artery bypass grafting (CABG) reduces functional mitral regurgitation (MR) associated with ischemic heart disease, although the predictive factors or mechanisms of reversibility of functional MR after CABG are not fully understood.We investigated whether mitral valve structure is associated with the outcome of functional MR after CABG.Methods and Results:From a consecutive series of 98 patients with mild-moderate functional MR preoperatively who underwent isolated CABG, we enrolled 66 patients who were followed up for >1 year postoperatively using echocardiography...
June 16, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28623503/investigating-the-suitability-of-carbon-nanotube-reinforced-polymer-in-transcatheter-valve-applications
#14
Monica M Rozeik, David J Wheatley, Terence Gourlay
The current delivery size of transcatheter aortic valves, limited by the thickness of their pericardial leaflets, correlates with a high prevalence of major vascular complications. Polyurethane valves can be developed to a fraction of the thickness of pericardial valves through the addition of carbon nanotubes to reinforce their leaflets. This study investigates the suitability of a novel carbon nanotube reinforced leaflet to reduce the delivery profile of transcatheter aortic valves. Carbon nanotube polyurethane composites were developed with thicknesses of 50 μm and their mechanical properties were determined in relation to various environmental effects...
June 16, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28620766/phenotype-transformation-of-aortic-valve-interstitial-cells-due-to-applied-shear-stresses-within-a-microfluidic-chip
#15
Xinmei Wang, Joohyung Lee, Mir Ali, Jungkyu Kim, Carla M R Lacerda
Despite valvular heart diseases constituting a significant medical problem, the acquisition of information describing their pathophysiology remains difficult. Due to valvular size, role and location within the body, there is a need for in vitro systems that can recapitulate disease onset and progression. This study combines the development of an in vitro model and its application in the mechanical stimulation of valvular cell transformation. Specifically, porcine aortic valvular interstitial cells (PAVIC) were cultured on polydimethylsiloxane microfluidic devices with or without exposure to shear stresses...
June 15, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28606889/parallel-suture-technique-with-proglide-a-novel-method-for-management-of-vascular-access-during-transcatheter-aortic-valve-implantation-tavi
#16
Ilka Ott, Anupama Shivaraju, Nina R Schäffer, Antonio H Frangieh, Jonathan Michel, Oliver Husser, Christian Hengstenberg, Patrick Mayr, Roisin Colleran, Constanza Pellegrini, Salvatore Cassese, Massimilliano Fusaro, Heribert Schunkert, Adnan Kastrati, Albert M Kasel
AIMS: Aim of this study was to evaluate vascular complications using the "parallel suture technique" in patients receiving Edwards SAPIEN XT (SXT) or SAPIEN S3 (S3) transcatheter heart valve (THV). METHODS AND RESULTS: Two hundred consecutive patients with symptomatic severe aortic stenosis treated with TF-TAVI were included in this study where the "parallel suture technique" was applied for vascular access site closure. This was achieved by placing the sutures medial and lateral to the puncture site...
June 13, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28579288/movat-pentachrom-stain-reveals-unexpected-high-osteogenesis-rate-in-aortic-valves
#17
Claudia Dittfeld, Michael Haase, Maria Feilmeier, Anett Jannasch, Petra Büttner, Katrin Plötze, Thomas Waldow, Sems-Malte Tugtekin
BACKGROUND AND AIM OF THE STUDY: Aortic valve (AV) stenosis is the most common valvular heart disease with an incidence of 3% for people ≥ 65years in the industrialized world with indication for a surgical or transcatheter valve replacement. Researchers suppose osteogenic processes as key mechanisms in calcific aortic valve stenosis. Recently, Torre et al. published impressive histological analyses and detected osseous and/or chondromatous metaplasia in 15.6% of 6685 native calcified aortic valves...
June 2, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/28557344/transseptal-transcatheter-mitral-valve-in-valve-a-step-by-step-guide-from-preprocedural-planning-to-postprocedural-care
#18
Mayra Guerrero, Michael Salinger, Amit Pursnani, Paul Pearson, Mark Lampert, Justin Levisay, Hyde Russell, Ted Feldman
Transcatheter mitral valve replacement has been successfully performed with the use of aortic transcatheter heart valves in hundreds of patients worldwide with severe dysfunction of a degenerated mitral bioprosthesis and high surgical risk for repeat operation. The delivery approach in the vast majority of the mitral valve-in-valve procedures has been transapical. Although the transseptal approach may be more technically challenging, it is less invasive and may be preferred by patients. Data from case series and a large international registry suggest that patients treated with transseptal mitral valve-in-valve have faster recovery, more improvement in left ventricular ejection fraction and possibly lower mortality compared with patients treated with transapical approach...
May 30, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28544840/redo-tricuspid-valve-repair-with-leaflet-augmentation-using-the-left-atrial-wall
#19
Daisuke Endo, Kenji Kuwaki, Taira Yamamoto, Atsushi Amano
The case is reported of a 79-year-old female who received a patch augmentation of the tricuspid anterior and septal leaflets with a resected left atrial wall to address recurrent tricuspid regurgitation, including tricuspid valve tethering. The patient was admitted to the authors' hospital for chronic heart failure with paravalvular leakage after aortic valve replacement and recurrent severe tricuspid regurgitation. She had undergone two previous cardiac surgeries. Re-tricuspid repair required an augmentation of the tricuspid valve leaflets in addition to tricuspid annuloplasty...
January 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28540072/standard-imaging-techniques-in-transcatheter-aortic-valve-replacement
#20
REVIEW
Arash Salemi, Berhane M Worku
Transcatheter aortic valve replacement (TAVR) has become a widely accepted therapeutic option for patients with severe, symptomatic aortic stenosis at intermediate, high, or extreme risk for conventional surgery as determined through a heart team approach. Two valve prostheses are currently available and the Food and Drug Administration (FDA) approved in the United States for TAVR: the self-expandable Medtronic CoreValve (Medtronic, Inc., Minneapolis, MN, USA) and the balloon-expandable Edwards Sapien Valve (Edwards Lifesciences, Irvine CA, USA)...
April 2017: Journal of Thoracic Disease
keyword
keyword
14857
1
2
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"