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On-X Valve

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https://www.readbyqxmd.com/read/28324166/redescription-of-chloromyxum-ellipticum-li-nie-1973-myxosporea-chloromyxidae-infecting-the-gall-bladder-of-grass-carp-ctenopharyngodon-idellus-valenciennes-1844-supplemented-by-morphological-and-molecular-characteristics
#1
J Y Zhang, Y L Zhao, M D Batueva, D Luo, Z F Xing, Q Q Zhang, X H Liu
The traditional taxonomy of the genus Chloromyxum Mingazzini, 1890 has been intensively challenged to be paraphyletic by recent ribosomal DNA (rDNA)-based phylogenetic analysis. Undersampling to get rich sequence data to infer more scientific phylogenetic relationships makes scientists conservatively assign all non-marine elasmobranch-infecting species as Chloromyxum sensu lato. Although complex ridge pattern on the spore surface observed by scanning electron microscopy was thought to be critical for the identification of Chloromyxum species, insufficient data also prevent this ultrastructural data to be a valid taxonomic feature for this genus...
March 21, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28291607/indexed-left-atrial-size-predicts-all-cause-and-cardiovascular-mortality-in-patients-undergoing-aortic-valve-surgery
#2
Victor X Mosquera, Alberto Bouzas-Mosquera, Miguel González-Barbeito, Victor Bautista-Hernandez, Javier Muñiz, Nemesio Alvarez-García, José J Cuenca-Castillo
OBJECTIVES: The enlargement of the left atrium has been identified as a marker of chronically increased left ventricular filling pressure and left ventricular diastolic dysfunction. This study aims to evaluate the association of indexed left atrial diameter with stroke, cardiovascular mortality, the combined event, and all-cause mortality in patients who underwent aortic valve surgery. METHODS: Indexed left atrial diameter was measured in 2011 adult patients (mean age, 70...
February 9, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28284370/frequency-and-associated-clinical-features-of-functional-tricuspid-regurgitation-in-patients-with-chronic-atrial%C3%A2-fibrillation
#3
Susan X Zhao, Nima Soltanzad, Aravind Swaminathan, W David Ogden, Nelson B Schiller
Significant functional tricuspid regurgitation (TR) can develop in some but not all patients with chronic atrial fibrillation (AF). This study sought to identify factors likely to be involved in determining the severity of TR in patients with chronic AF. In this retrospective cohort study of adult patients referred for transthoracic echocardiography for evaluation of AF between 2004 and 2015, we identified 170 patients with chronic AF in the absence of structural or known coronary heart disease. Patients were classified into nonsevere (89 patients) versus severe TR (81 patients) groups based on a comprehensive assessment of color Doppler, spectral Doppler, and morphologic parameters of the tricuspid valve and right side of the heart...
February 10, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28281241/decellularized-cryopreserved-allografts-as-off-the-shelf-allogeneic-alternative-for-heart-valve-replacement-in-vitro-assessment-before-clinical-translation
#4
Laura Iop, Adolfo Paolin, Paola Aguiari, Diletta Trojan, Elisa Cogliati, Gino Gerosa
Cryopreserved allogeneic conduits are the elective biocompatible choice among currently available substitutes for surgical replacement in end-stage valvulopathy. However, degeneration occurs in 15 years in adults or faster in children, due to recipient's immunological reactions to donor's antigens. Here, human aortic valves were decellularized by TRICOL, based on Triton X-100 and sodium cholate, and submitted to standard cryopreservation (TRICOL-human aortic valves (hAVs)). Tissue samples were analyzed to study the effects of the combined procedure on original valve architecture and donor's cell removal...
March 9, 2017: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/28270219/quantification-of-aortic-stenosis-diagnostic-parameters-comparison-of-fast-3-direction-and-1-direction-phase-contrast-cmr-and-transthoracic-echocardiography
#5
Juliana Serafim da Silveira, Matthew Smyke, Adam V Rich, Yingmin Liu, Ning Jin, Debbie Scandling, Jennifer A Dickerson, Carlos E Rochitte, Subha V Raman, Lee C Potter, Rizwan Ahmad, Orlando P Simonetti
BACKGROUND: Aortic stenosis (AS) is a common valvular disorder, and disease severity is currently assessed by transthoracic echocardiography (TTE). However, TTE results can be inconsistent in some patients, thus other diagnostic modalities such as cardiovascular magnetic resonance (CMR) are demanded. While traditional unidirectional phase-contrast CMR (1Dir PC-CMR) underestimates velocity if the imaging plane is misaligned to the flow direction, multi-directional acquisitions are expected to improve velocity measurement accuracy...
March 7, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28238247/dysfunction-of-an-on-x-heart-valve-by-pannus
#6
Cipriano Abad, Stefano Urso, Elsa Gomez, Maria De la Vega
A 68-year-old woman with a history of previous double-valve replacement with On-X mechanical heart valves presented with clinical, echocardiographic and cardiac catheterization signs of obstruction of the On-X tricuspid heart valve prosthesis. The patient was successfully reoperated, but at surgery the valve was seen to be invaded by an abnormal overgrowth of pannus that blocked one of the leaflets. A small amount of non-obstructive fresh thrombus was also observed. The valve was successfully replaced with a biological heart valve prosthesis...
September 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28237734/respective-role-of-surface-electrocardiogram-and-his-bundle-recordings-to-assess-the-risk-of-atrioventricular-block-after-transcatheter-aortic-valve-replacement
#7
N Badenco, C Chong-Nguyen, C Maupain, C Himbert, G Duthoit, X Waintraub, T Chastre, E Gandjbakhch, F Hidden-Lucet, P Le Prince, J-P Collet, R Frank
BACKGROUND: Atrioventricular block (AVB) is common after transcatheter aortic valve replacement (TAVR) and permanent pacemaker (PPM) implantation is needed in up to 30% of patients. Main predictors of long term AVB are electrocardiographic. The purpose of this study is to assess the prognostic value of serial HV intervals measured before and after TAVR to shorten the timing of PPM implantation. METHODS: His bundle recordings were performed before (HV1), immediately after TAVR (HV2) and at day 2 for Edwards Sapien (ES) and 5 for Medtronic CoreValve (CV) (HV3)...
February 10, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28178293/%C3%AE-ct-of-ex-vivo-stained-mouse-hearts-and-embryos-enables-a-precise-match-between-3d-virtual-histology-classical-histology-and-immunochemistry
#8
Christian Dullin, Roser Ufartes, Emanuel Larsson, Sabine Martin, Marcio Lazzarini, Giuliana Tromba, Jeannine Missbach-Guentner, Diana Pinkert-Leetsch, Dörthe M Katschinski, Frauke Alves
The small size of the adult and developing mouse heart poses a great challenge for imaging in preclinical research. The aim of the study was to establish a phosphotungstic acid (PTA) ex-vivo staining approach that efficiently enhances the x-ray attenuation of soft-tissue to allow high resolution 3D visualization of mouse hearts by synchrotron radiation based μCT (SRμCT) and classical μCT. We demonstrate that SRμCT of PTA stained mouse hearts ex-vivo allows imaging of the cardiac atrium, ventricles, myocardium especially its fibre structure and vessel walls in great detail and furthermore enables the depiction of growth and anatomical changes during distinct developmental stages of hearts in mouse embryos...
2017: PloS One
https://www.readbyqxmd.com/read/28174408/-double-valve-replacement-and-tricuspid-annuloplasty-in-a-patient-with-situs-inversus-totalis-and-mirror-image-dextrocardia-report-of-a-case
#9
Hiroshi Kumano, Keisuke Shuntoh, Akimitsu Yamaguchi, Kazuhito Tatsu
Situs inversus totalis and mirror-image dextrocardia is a rare congenital anomaly. A 79-year-old man with a history of atrial fibrillation presented to our hospital with chest oppression. Chest X-ray and computed tomography showed mirror-image dextrocardia and situs inversus totalis. Echocardiography revealed severe mitral and aortic regurgitation and mild tricuspid regurgitation. Mitral and aortic valve replacement using bioprosthesises, tricuspid annuloplasty and closure of the left atrial appendage were successfully performed...
February 2017: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/28170357/on-x-valve-the-next-generation-aortic-valve
#10
REVIEW
Rahul Chaudhary, Jalaj Garg, Parasuram Krishnamoorthy, Neeraj Shah, Bruce A Feldman, Matthew W Martinez, Ronald Freudenberger
The On-X valve is a newer generation mechanical bileaflet valve. Its key features include the use of pure pyrolytic carbon (devoid of silicon), a length-to-diameter ratio similar to a native valve, an inlet flared orifice, a leaflet opening up to 90 degrees, a shorter leaflet closing angle, a 2-point leaflet contact, and an actuated pivot. These features have translated into increased strength, improved valve hemodynamics, reduced hemolysis, and thrombogenicity. The 2014 American Heart Association/American College of Cardiology guidelines for the management of patients with valvular heart disease recommend an international normalized ratio (INR) of 2...
March 2017: Cardiology in Review
https://www.readbyqxmd.com/read/28121172/cost-utility-analysis-of-cardiac-rehabilitation-after-conventional-heart-valve-surgery-versus-usual-care
#11
Tina Birgitte Hansen, Ann Dorthe Zwisler, Selina Kikkenborg Berg, Kirstine Lærum Sibilitz, Lau Caspar Thygesen, Jakob Kjellberg, Patrick Doherty, Neil Oldridge, Rikke Søgaard
Background While cardiac rehabilitation in patients with ischaemic heart disease and heart failure is considered cost-effective, this evidence may not be transferable to heart valve surgery patients. The aim of this study was to investigate the cost-effectiveness of cardiac rehabilitation following heart valve surgery. Design We conducted a cost-utility analysis based on a randomised controlled trial of 147 patients who had undergone heart valve surgery and were followed for 6 months. Methods Patients were randomised to cardiac rehabilitation consisting of 12 weeks of physical exercise training and monthly psycho-educational consultations or to usual care...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28097190/chronic-type-a-aortic-dissection-and-giant-aortic-root-aneurysm-after-aortic-valve-replacement
#12
Andrés Enríquez Puga, Sara Castaño Rodríguez, Blanca Mateos Pañero, Beatriz Castaño Moreira, Luis Fernando López Almodóvar
We describe the case of a 61-year-old male with a giant aortic root aneurysm associated with chronic aortic Type A dissection. The patient had been operated on 16 years before due to aortic annuloectasia with mechanical valve replacement. The patient underwent revision aortic surgery with a Bentall-De Bono operation with Svensson modification, using a #21 On-X Valsalva mechanical valve conduit. The postoperative course was uneventful.
June 2016: Aorta (Stamford, Conn.)
https://www.readbyqxmd.com/read/28056256/-strategies-for-surgical-treatment-of-ischemic-mitral-incompetence
#13
Z B Qiu, X Chen
Treatment of ischemic mitral incompetence (IMI) is an important problem in cardiovascular surgery, and it is arguing to the best strategies for surgical treatment of IMI. IMI can be quantitative assessment precisely by three-dimensional ultrasonic sound. Perioperative transesophageal echocardiography can acquire detailed information about IMI, but it is possible to underestimate the degree of IMI. The effective mitral regurgitation area at resting are the independently prognosis factor in patients with IMI...
January 1, 2017: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/28029352/-mitral-valve-repair-with-the-mitraclip-following-surgical-mitral-annuloplasty-failure
#14
F Picard, V-X Tadros, X Millán, A W Asgar
Mitral repair using the MitraClip device is on ongoing expansion and has been evaluated in different patterns of mitral regurgitation. Nevertheless, surgical approaches to mitral regurgitation remain the standard of care, at least in absence of contraindication. We report the first Canadian experience of mitral valve repair with the MitraClip following surgical mitral annuloplasty failure. Therapeutic considerations and potential challenges are discussed.
October 28, 2016: Annales de Cardiologie et D'angéiologie
https://www.readbyqxmd.com/read/27943178/early-experience-with-the-venus-p%C3%A2-valve-for-percutaneous-pulmonary-valve-implantation-in-native-outflow-tract
#15
F Garay, X Pan, Y J Zhang, C Wang, D Springmuller
INTRODUCTION: The Venus p‑valve (MedTech, Shanghai, China) is a self-expanding percutaneous heart valve designed to be implanted in a native patched right ventricle outflow tract. The worldwide clinical experience with this valve is just beginning and the results have so far been encouraging. We present our initial early experience implanting the Venus p‑valve in the native right ventricle outflow tract of patients with Tetralogy of Fallot repaired with a transannular patch. METHODS: In 10 selected patients a procedure for percutaneous pulmonary valve implantation was performed using the Venus p‑valve...
February 2017: Netherlands Heart Journal
https://www.readbyqxmd.com/read/27943176/rationale-and-design-of-the-edwards-sapien-3-periprosthetic-leakage-evaluation-versus-medtronic-corevalve-in-transfemoral-aortic-valve-implantation-elect-trial-a%C3%A2-randomised-comparison-of-balloon-expandable-versus-self-expanding-transcatheter-aortic-valve-prostheses
#16
M Abawi, P Agostoni, N H M Kooistra, M Samim, F Nijhoff, M Voskuil, H Nathoe, P A Doevendans, S A Chamuleau, K Urgel, J Hendrikse, T Leiner, A C Abrahams, B van der Worp, P R Stella
BACKGROUND AND OBJECTIVES: Periprosthetic aortic regurgitation (PPR) after transcatheter aortic valve implantation (TAVI) remains an important issue associated with impaired long-term outcomes. The current randomised study aims to evaluate potential differences between the balloon-expandable Edwards SAPIEN-3 and the self-expanding Medtronic CoreValve system with the main focus on post-TAVI PPR by means of novel imaging endpoints, and an additional focus on other clinical endpoints. ENDPOINTS: The primary endpoint of this study is quantitative assessment of the severity of post-procedural PPR using cardiac magnetic resonance imaging...
December 9, 2016: Netherlands Heart Journal
https://www.readbyqxmd.com/read/27913565/a-24-year-old-male-with-a-painful-and-cold-lower-extremity
#17
Eric A Robinson, Zain I Khalpey, Rajesh Janardhanan
CLINICAL INTRODUCTION: A 24-year-old male presented to the emergency department with intense pain in his right lower extremity. He has a medical history significant for systemic lupus erythematosus and antiphospholipid syndrome. He also had four prior episodes of deep venous thromboses on rivaroxaban. The patient stated that early in the morning, he started to feel intense pain that started from his knee and progressed to his calf, with associated numbness and paraesthesia. On physical examination, the limb felt cold with absent right popliteal and dorsalis pedis pulses...
December 2, 2016: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/27909513/assessment-of-sinoatrial-node-function-in-patients-with-persistent-and-long-standing-persistent-forms-of-atrial-fibrillation-after-maze-iii-procedure-combined-with-mitral-valve-operation
#18
Kulikov Aleksei A, Bokeria Leo A
RESEARCH OBJECTIVE: Assessment of sinoatrial node function after Maze III procedure combined with a mitral valve operation. METHODS: 100 patients were included in the research with persistent and long-standing persistent forms of atrial fibrillation (AF) and need of operative treatment concerning valve disease. The following preoperative preparation methods were executed to all patients: Electrocardiogram in 12 standard assignments;Two-dimensional echocardiographic with assessment of systolic and diastolic functions of the left ventricle, size of the left atrium and grade of valve disease;Transesophageal echocardiography for exclusion of blood clots in the left atrium and left atrial appendage;Coronary angiography for exclusion of coronary heart disease;Computer tomography for examination of cardiac chambers and anatomic characteristics of pulmonary veins...
June 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27903371/-impact-of-reduced-left-ventricular-ejection-fraction-on-all-cause-mortality-of-75-years-old-and-over-patients-with-moderate-to-severe-aortic-stenosis
#19
Z Li, Y Q Ye, M Y Wang, H Y Xu, S Y Teng, J Qian, W Wang, X Wang, Y J Wu
Objective: To evaluate the impact of left ventricular systolic dysfunction on all-cause mortality of 75 years old and over patients with moderate to severe aortic stenosis. Methods: Clinical data of 301 consecutive aged (≥75 years old) patients with a diagnosis of non-rheumatic moderate to severe aortic stenosis by echocardiography between January 1, 2008 and January 1, 2015 in our hospital were retrospectively analyzed. According to the LVEF, patients were divided into normal LVEF subjects and low LVEF subjects, and the low LVEF level was set at below 60%(≤60%(n=171)vs...
October 24, 2016: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/27896912/balloon-valvuloplasty-to-predict-x-ray-projection-angles-that-are-perpendicular-to-cardiovascular-structures-a-tavi-patient-feasibility-study
#20
Kenneth Fetterly, Kevin Greason, Verghese Mathew
OBJECTIVES: The purpose of this work is to describe methods to measure the 3D angular orientation of cardiovascular structures based on a planar image of a valvuloplasty balloon. These methods facilitate X-ray beam alignment with respect to the anatomy of interest. BACKGROUND: X-ray beam projections which are perpendicular to the long axis of cardiovascular structures are required to support interventional procedures, including transcatheter aortic valve implant (TAVI)...
November 29, 2016: Catheterization and Cardiovascular Interventions
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