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https://www.readbyqxmd.com/read/28944616/time-course-of-the-changes-in-right-and-left-ventricle-function-and-associated-factors-after-transcatheter-closure-of-atrial-septal-defects
#1
Byung W Yoo, Jung O Kim, Lucy Y Eun, Jae Y Choi, Dong S Kim
OBJECTIVE: The purpose of this study was to evaluate the changes in right ventricle (RV) and left ventricle (LV) function after transcatheter atrial septal defect (ASD) closure and to assess the influence of the age and the amount of shunt. DESIGN: Retrospective study PATIENTS: Fifty-three adult patients who underwent transcatheter closure were enrolled, then divided into subgroups according to the age (< 40 years vs ≥ 40 years), and the amount of shunt flow (QpQs < 2...
September 24, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28944171/current-state-of-the-art-and-future-of-myectomy
#2
REVIEW
Magdi H Yacoub, Ahmed Afifi, Hesham Saad, Heba Aguib, Ahmed ElGuindy
Surgical relief of left ventricular outflow tract obstruction (LVOTO) in hypertrophic cardiomyopathy (HCM) requires more than septal myectomy. The procedure is currently the gold standard for all symptomatic HCM patients except those with comorbidities. The operation requires an individualized approach to restore the sophisticated functions of the left ventricular outflow tract (LVOT) without injury to the surrounding vital structures. The procedure should be tailored to deal with all the varied components of the obstruction including fibrous trigones, accessory tissues, and papillary muscle fusion...
July 2017: Annals of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/28942388/restorative-valve-therapy-by-endogenous-tissue-restoration-tomorrow-s-world-reflection-on-the-europcr-2017-session-on-endogenous-tissue-restoration
#3
Patrick W Serruys, Yosuke Miyazaki, Athanasios Katsikis, Mohammad Abdelghani, Martin B Leon, Renu Virmani, Thierry Carrel, Martijn Cox, Yoshinobu Onuma, Osama I I Soliman
The current standard of treatment of valvular diseases with severe functional and/or clinical consequences is the repair or replacement of the valve, which is usually surgical or, in specific scenarios, percutaneous. The available prosthetic valves, however, are not a magic bullet in the physicians' arsenal for the management of valvular diseases, since the age-dependent structural valve deterioration (SVD) and the need for prolonged systemic anticoagulation in the case of metallic prosthetic valves are not inconsequential during the lifespan of a patient with an implanted prosthetic valve...
September 24, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28941606/new-developments-in-hypertrophic-cardiomyopathy
#4
REVIEW
Robert M Cooper, Claire E Raphael, Max Liebregts, Nandan S Anavekar, Josef Veselka
Hypertrophic cardiomyopathy is the leading cause of sudden death in young individuals and an important cause of heart failure at any age. In this review we discuss advances in investigation and management of this heterogenous disease. Improved cardiac imaging has allowed us to detail many of the structural abnormalities whereas the use of new techniques, predominantly in cardiac magnetic resonance imaging, has given us a greater insight in to tissue architecture, mechanism of contractile abnormalities, and function...
October 2017: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/28939354/a-deep-learning-approach-to-estimate-chemically-treated-collagenous-tissue-nonlinear-anisotropic-stress-strain-responses-from-microscopy-images
#5
Liang Liang, Minliang Liu, Wei Sun
Biological collagenous tissues comprised of networks of collagen fibers are suitable for a broad spectrum of medical applications owing to their attractive mechanical properties. In this study, we developed a noninvasive approach to estimate collagenous tissue elastic properties directly from microscopy images using Machine Learning (ML) techniques. Glutaraldehyde-treated bovine pericardium (GLBP) tissue, widely used in the fabrication of bioprosthetic heart valves and vascular patches, was chosen to develop a representative application...
September 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28935890/demonstration-and-analysis-of-the-suction-effect-for-pumping-lymph-from-tissue-beds-at-subatmospheric-pressure
#6
Samira Jamalian, Mohammad Jafarnejad, Scott D Zawieja, Christopher D Bertram, Anatoliy A Gashev, David C Zawieja, Michael J Davis, James E Moore
Many tissues exhibit subatmospheric interstitial pressures under normal physiologic conditions. The mechanisms by which the lymphatic system extracts fluid from these tissues against the overall pressure gradient are unknown. We address this important physiologic issue by combining experimental measurements of contractile function and pressure generation with a previously validated mathematical model. We provide definitive evidence for the existence of 'suction pressure' in collecting lymphatic vessels, which manifests as a transient drop in pressure downstream of the inlet valve following contraction...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28929616/noninvasive-assessment-of-left-ventricular-end-diastolic-pressure-by-deceleration-time-of-early-diastolic-mitral-annular-velocity-in-patients-with-heart-failure
#7
Kazushi Takemoto, Kumiko Hirata, Takeshi Hozumi, Takashi Tanimoto, Makoto Orii, Yasutsugu Shiono, Yoshiki Matsuo, Yasushi Ino, Hironori Kitabata, Takashi Kubo, Atsushi Tanaka, Takashi Akasaka
OBJECTIVE: To examine the diagnostic ability of the deceleration time of early mitral annular velocity (e'DT) as determined by tissue Doppler velocity image, a method for assessing LV filling pressure. BACKGROUNDS: Estimation of LV filling pressure by Doppler echocardiography requires a combination of various parameters. Therefore, there remains a need for a simple index in LV filling pressure estimation. The e' is known to be reduced and delayed with increased LV filling pressure during development of heart failure...
September 2017: Echocardiography
https://www.readbyqxmd.com/read/28929246/a-numerical-study-of-the-hemodynamic-effect-of-the-aortic-valve-on-coronary-flow
#8
Shaily Wald, Alex Liberzon, Idit Avrahami
During diastole, coronary perfusion depends on the pressure drop between the myocardial tissue and the coronary origin located at the aortic root. This pressure difference is influenced by the flow field near the closing valve leaflets. Clinical evidence is conclusive that patients with severe aortic stenosis (AS) suffer from diastolic dysfunction during hyperemia, but show increased coronary blood flow (CBF) during rest. Transcatheter aortic valve implantation (TAVI) was shown to decrease rest CBF along with its main purpose of improving the aortic flow and reducing the risk of heart failure...
September 19, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28928607/speckle-tracking-evaluation-of-right-ventricular-functions-in-children-with-sickle-cell-disease
#9
Osama Abd Rab Elrasol Tolba, Mohamed Ramadan El-Shanshory, Mohamed Abd Elaziz El-Gamasy, Walid Ahmed El-Shehaby
BACKGROUND: Cardiac dysfunction is a risk factor for death in patients with sickle cell disease (SCD). AIM OF THE WORK: Aim of the work is to evaluate the right ventricular systolic and diastolic functions by tissue Doppler and speckling tracking imaging in children with SCD. SUBJECTS AND METHODS: Thirty children with SCD and thirty controls were subjected to clinical, laboratory evaluations, and echocardiographic study using GE Vivid 7 (GE Medical System, Horten, Norway with a 3...
September 2017: Annals of Pediatric Cardiology
https://www.readbyqxmd.com/read/28926643/skin-perfusion-pressure-as-an-indicator-of-tissue-perfusion-in-valvular-heart-surgery-preliminary-results-from-a-prospective-observational-study
#10
Young Song, Sarah Soh, Jae-Kwang Shim, Kyoung-Un Park, Young-Lan Kwak
Hemodynamic management aims to provide adequate tissue perfusion, which is often altered during cardiac surgery with cardiopulmonary bypass (CPB). We evaluated whether skin perfusion pressure (SPP) can be used for monitoring of adequacy of tissue perfusion in patients undergoing valvular heart surgery. Seventy-two patients undergoing valve replacement were enrolled. SPP and serum lactate level were assessed after anaesthesia induction (baseline), during CPB, after CPB-off, end of surgery, arrival at intensive care unit, and postoperative 6 h...
2017: PloS One
https://www.readbyqxmd.com/read/28922978/6-year-old-sheep-as-a-clinically-relevant-large-animal-model-for-aortic-valve-replacement-using-tissue-engineered-grafts-based-on-decellularized-allogenic-matrix
#11
Karolina Theodoridis, Igor Tudorache, Serghei Cebotari, Tanja Meyer, Alexandru Calistru, Samir Sarikouch, Cristoph Bara, Axel Haverich, Andres Hilfiker
Tissue-engineered (TE) grafts based on decellularized grafts have shown very promising results in preclinical and clinical studies. However, in animal models valves have either been tested in juvenile models or in the clinically less relevant pulmonary valve position. In this study, we tested the grafts in the aortic valve (AV) position of 6-year old sheep, as geriatric patients in need of an aortic valve substitute due to calcification are the largest patient group benefiting from TE grafts. Decellularized AV (n=4) and decellularized AV additionally re-endothelialized with autologous cells (n=3) were implanted in the aortic valve position of 6-year-old female sheep...
September 19, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28918896/role-of-circulating-endothelial-progenitor-cells-in-the-reparative-mechanisms-of-stable-ischemic-myocardium
#12
D Morrone, F Felice, C Scatena, A De Martino, M L E Picoi, N Mancini, S Blasi, M Menicagli, R Di Stefano, U Bortolotti, A G Naccarato, A Balbarini
BACKGROUND: Mobilization of endothelial progenitor cells (EPCs) into circulation from bone marrow in patients with acute myocardial infarction has strong scientific evidence; less is known about EPC mobilization in patients with stable coronary artery disease (CAD). The aim of this study was to investigate the association of stable ischemic heart disease with EPC levels in tissue and blood. METHODS: Fifty-five consecutive patients admitted to a single treatment center for valve or coronary artery bypass grafting (CABG) surgeries were included in the study...
September 14, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28916836/modelling-the-deformation-of-the-elastin-network-in-aortic-valve
#13
Afshin Anssari-Benam, Andrea Bucchi
This paper is concerned with proposing a suitable structurally-motivated strain energy function for modelling the deformation of the elastin network within the aortic valve (AV) tissue. The AV elastin network is the main non-collagenous load-bearing component of the valve matrix and therefore, within the context of continuum-based modelling of the AV, it essentially serves as the contribution of the 'isotropic matrix'. To date, such function has mainly been considered as either a generic neo-Hookean term or a general exponential function...
September 16, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28915471/characterization-of-mechanical-properties-of-pericardium-tissue-using-planar-biaxial-tension-and-flexural-deformation
#14
Kyle Murdock, Caitlin Martin, Wei Sun
Flexure is an important mode of deformation for native and bioprosthetic heart valves. However, mechanical characterization of bioprosthetic leaflet materials has been done primarily through planar tensile testing. In this study, an integrated experimental and computational cantilever beam bending test was performed to characterize the flexural properties of glutaraldehyde-treated bovine and porcine pericardium of different thicknesses. A strain-invariant based structural constitutive model was used to model the pericardial mechanical behavior quantified through the bending tests of this study and the planar biaxial tests previously performed...
September 12, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28911943/heterozygous-deletion-of-akt1-rescues-cardiac-contractility-but-not-hypertrophy-in-a-mouse-model-of-noonan-syndrome-with-multiple-lentigines
#15
Rajika Roy, Maike Krenz
Noonan Syndrome with Multiple Lentigines (NSML) is associated with congenital heart disease in form of pulmonary valve stenosis and hypertrophic cardiomyopathy (HCM). Genetically, NSML is primarily caused by mutations in the non-receptor protein tyrosine phosphatase SHP2. Importantly, certain SHP2 mutations such as Q510E can cause a particularly severe form of HCM with heart failure in infancy. Due to lack of insight into the underlying pathomechanisms, an effective custom-tailored therapy to prevent heart failure in these patients has not yet been found...
September 11, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28902940/bacterial-translocation-and-mortality-on-rat-model-of-intestinal-ischemia-and-obstruction
#16
Rafael Izar Domingues da Costa, Roberto Rasslan, Marcia Kiyomi Koike, Edivaldo Massazo Utiyama, Edna Frasson de Souza Montero
Purpose: To develop an experimental model of intestinal ischemia and obstruction followed by surgical resection of the damaged segment and reestablishment of intestinal transit, looking at bacterial translocation and survival. Methods: After anesthesia, Wistar rats was subject to laparotomy, intestinal ischemia and obstruction through an ileal ligature 1.5cm of ileum cecal valve; and the mesenteric vessels that irrigate upstream of the obstruction site to approximately 7 to 10 cm were ligated...
August 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28895285/complete-filter-based-cerebral-embolic-protection-with-transcatheter-aortic-valve-replacement
#17
Lennart Van Gils, Herbert Kroon, Joost Daemen, Claire Ren, Anne-Marie Maugenest, Marguerite Schipper, Peter P De Jaegere, Nicolas M Van Mieghem
OBJECTIVES: To evaluate the value of left vertebral artery filter protection in addition to the current filter-based embolic protection technology to achieve complete cerebral protection during TAVR. BACKGROUND: The occurrence of cerebrovascular events after transcatheter aortic valve replacement (TAVR) has fueled concern for its potential application in younger patients with longer life expectancy. Transcatheter cerebral embolic protection (TCEP) devices may limit periprocedural cerebrovascular events by preventing macro and micro-embolization to the brain...
September 12, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28894023/cytokinin-auxin-crosstalk-in-the-gynoecial-primordium-ensures-correct-domain-patterning
#18
Christina Joy Müller, Emma Larsson, Lukáš Spíchal, Eva Sundberg
The Arabidopsis thaliana gynoecium consists of two congenitally fused carpels made up of two lateral valve domains and two medial domains, which retain meristematic properties and later fuse to produce the female reproductive structures vital for fertilization. Polar auxin transport (PAT) is important for setting up distinct apical auxin signaling domains in the early floral meristem remnants allowing for lateral domain identity and outgrowth. Crosstalk between auxin and cytokinin plays important roles in the development of other meristematic tissues, however hormone interaction studies to date have focused on more accessible later-stage gynoecia and the spatiotemporal interactions pivotal for patterning of early gynoecium primordia remain unknown...
September 11, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28893433/effects-of-remote-ischemic-preconditioning-in-patients-with-concentric-myocardial-hypertrophy-a-randomized-controlled-trial-with-molecular-insights
#19
Young Song, Jong Wook Song, Sak Lee, Ji-Hae Jun, Young-Lan Kwak, Jae-Kwang Shim
BACKGROUND: Efficacy of remote ischemic preconditioning (RIPC) for cardioprotection in cardiac surgery is controversial. We aimed to evaluate the clinical and molecular effects of RIPC on the concentrically hypertrophied myocardium. METHODS: Seventy-two aortic stenosis patients receiving aortic valve replacement (AVR) under sevoflurane anesthesia were randomly allocated to RIPC (3cycles of 5-min inflation [300mmHg] and deflation on the left arm) or control (deflated cuff placement) group...
September 6, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28890780/recellularization-of-decellularized-heart-valves-progress-toward-the-tissue-engineered-heart-valve
#20
REVIEW
Mitchell C VeDepo, Michael S Detamore, Richard A Hopkins, Gabriel L Converse
The tissue-engineered heart valve portends a new era in the field of valve replacement. Decellularized heart valves are of great interest as a scaffold for the tissue-engineered heart valve due to their naturally bioactive composition, clinical relevance as a stand-alone implant, and partial recellularization in vivo. However, a significant challenge remains in realizing the tissue-engineered heart valve: assuring consistent recellularization of the entire valve leaflets by phenotypically appropriate cells...
January 2017: Journal of Tissue Engineering
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