Read by QxMD icon Read

tissue valve

Caitlin Keighley, Jonathan Emerson, Sharon Chen, Don Packham
No abstract text is available yet for this article.
February 2016: Pathology
Venkata S R Dukkipati, Anne L Ridler, Keith G Thompson, Bryce M Buddle, Barry A Hedgespeth, Marian Price-Carter, Douglas J Begg, Richard J Whittington, Brigitte Gicquel, Alan Murray
A long-term study was undertaken to monitor immune responses, faecal cultures and clinical disease in sheep experimentally infected with Mycobacterium avium subspecies paratuberculosis (Map) strain Telford. New Zealand Merino lambs (N=56) were challenged with three oral doses of Map suspension. The lambs were weighed and faecal and blood samples obtained at different time-points. At 63 weeks post-challenge, surviving sheep were euthanised and samples of liver, ileo-caecal valve and mesenteric lymph node were collected for histopathology and Map culture...
November 15, 2016: Veterinary Microbiology
Z Riedelová-Reicheltová, E Brynda, T Riedel
Fibrin is a versatile biopolymer that has been extensively used in tissue engineering. In this paper fibrin nanostructures prepared using a technique based on the catalytic effect of fibrin-bound thrombin are presented. This technique enables surface-attached thin fibrin networks to form with precisely regulated morphology without the development of fibrin gel in bulk solution. Moreover, the influence of changing the polymerization time, along with the antithrombin III and heparin concentrations on the morphology of fibrin nanostructures was explored...
October 20, 2016: Physiological Research
Giordano Tasca, Matteo Selmi, Emiliano Votta, Paola Redaelli, Francesco Sturla, Alberto Redaelli, Amando Gamba
BACKGROUND: Aortic root aneurysm can be treated with valve-sparing procedures. The David and Yacoub techniques have shown excellent long-term results but are technically demanding. Recently, a new and simpler procedure, the Sleeve technique, was proposed with encouraging results. We aimed to quantify the biomechanics of the initially aneurysmal aortic root (AR) after the Sleeve procedure to assess whether it induces abnormal stresses, potentially undermining its durability. METHODS: Two finite element (FE) models of the physiologic and aneurysmal AR were built, accounting for the anatomical asymmetry and the nonlinear and anisotropic mechanical properties of human AR tissues...
October 15, 2016: Annals of Thoracic Surgery
Tanima Banerjee, Somaditya Mukherjee, Sudip Ghosh, Monodeep Biswas, Santanu Datta, Sanjib Pattari, Shelly Chatterjee, Arun Bandyopadhyay
OBJECTIVE: Rheumatic Heart Disease (RHD), a chronic acquired heart disorder results from Acute Rheumatic Fever. RHD is mostly prevalent in developing nations which is mainly diagnosed by transthoracic echocardiography. Till date, there is no biochemical marker for disease management. In the present study we aim to investigate whether mitral valve remodeling contributes to altered levels of circulating biomarkers of collagen metabolism in rheumatic heart disease. DESIGN AND METHOD: The study involved RHD subjects with before and after valve replacement surgery which includes age and sex matched controls...
September 2016: Journal of Hypertension
Amin Hassanzadeh-Barforoushi, Jonathan Shemesh, Nona Farbehi, Mohsen Asadnia, Guan Heng Yeoh, Richard P Harvey, Robert E Nordon, Majid Ebrahimi Warkiani
Regulation of tissue development and repair depends on communication between neighbouring cells. Recent advances in cell micro-contact printing and microfluidics have facilitated the in-vitro study of homotypic and heterotypic cell-cell interaction. Nonetheless, these techniques are still complicated to perform and as a result, are seldom used by biologists. We report here development of a temporarily sealed microfluidic stamping device which utilizes a novel valve design for patterning two adherent cell lines with well-defined interlacing configurations to study cell-cell interactions...
October 18, 2016: Scientific Reports
Monish S Raut, Sumir Dubey, Arun Maheshwari, Manish Sharma
Inverted left atrial tissue is mostly identified when the heart is empty while coming off bypass. During echocardiography a new, echodense mobile mass in the left atrium without attachment is visualized. Such a picture can easily produce not only confusion in the diagnosis but also mitral valve obstruction, hemodynamic instability, and a possibility of appendage necrosis. Inability to identify such inverted tissue can lead to unwanted interventions with additional cardiopulmonary bypass time.
September 2016: Indian Heart Journal
Katsutoshi Miura, Hideki Katoh
The aim of this study was to reveal the pathogenesis of aortic stenosis (AS) and regurgitation (AR) by comparing differences in mechanical and biochemical alterations. We applied scanning acoustic microscopy (SAM) to measure the speed of sound (SOS) through valves to estimate the elasticity and monitor sensitivity to protease treatment, as the SOS is correlated with the stiffness of materials, which is reduced after digestion by proteases. The fibrosa of both the AS and AR groups were stiffer than the fibrosa of the normal group...
2016: BioMed Research International
Sun Hwa Lee, Seokyong Ryu, Seoung Won Choi, Hye Jin Kim, Tae Kyug Kang, Sung Chan Oh, Suk Jin Cho, Jae Hoon Lee, Euy Suk Chung, Myoung Hwan Kim
BACKGROUND: Aortic dissection in pregnancy is relatively rare, but it is often fatal. The estimated incidence of aortic dissection in the general population is 2.9 per 100,000 person-years. Early recognition and treatment of aortic dissections are crucial for survival. Whereas the majority of patients who present with aortic dissection are older than 50 years of age and have a history of hypertension, younger patients with connective tissue disease, bicuspid aortic valves, or a family history of aortic dissection are also at increased risk for developing this condition...
October 12, 2016: Journal of Emergency Medicine
M Ogawa, T Fujita, N Fukushima, T Nakatani, S Kitamiura, Y Imamura, K Watanabe, S Iwata, A Kinjo
BACKGROUND: Because tissue transplantation (TTx) has not been familiar to the general public or even to medical staffs in Japan, awareness of TTx is very important to increase tissue donation. Our primary aim was to describe the current status of awareness of TTx in medical staffs and in the general public around Osaka. METHODS: Between July 2014 and February 2015, 1015 general public citizens, 203 medical staff members working in emergency hospitals, and 168 cardiothoracic surgeons were invited to complete a letter or web-based survey through the use of a self-designed questionnaire...
September 2016: Transplantation Proceedings
Lars Folkestad, Jannie Dahl Hald, Jeppe Gram, Bente L Langdahl, Anne Pernille Hermann, Axel Cp Diederichsen, Bo Abrahamsen, Kim Brixen
BACKGROUND: Osteogenesis imperfecta (OI) is a hereditary connective tissue disease often due to mutations in genes coding for type 1 collagen. Collagen type 1 is important in the development of the heart and vasculature. Little is known about the risk of cardiovascular disease (CVD) in OI. OBJECTIVE: To investigate the risk of symptomatic CVD in OI. DESIGN: A Danish nationwide, population-based and register-based longitudinal open cohort study...
September 30, 2016: International Journal of Cardiology
Peter B Terry, Richard J Traystman
Oxygen delivery and carbon dioxide removal being critical to cell survival, mammals have developed collateral vascular and ventilation systems to ensure tissue viability. Collateral ventilation, defined as ventilation of alveoli via pathways that bypass normal airways, is present in humans and many other species. The presence of collateral ventilation can be beneficial in certain disease states, while its relative absence can predispose to other diseases. These well defined anatomical pathways contribute little to ventilation in normal humans, but modulate ventilation perfusion imbalance in a variety of diseases including obstructive diseases such as asthma and emphysema...
October 14, 2016: Annals of the American Thoracic Society
Basant M Elnady, Ayman Saeed Mohamed Abdelghafar, El Shazly Abdul Khalik, Mohammed Mesfer Algethami, A S Basiony, Mona Dhaif Allah Al-Otaibi, Maram Eidhah Al-Otaibi
OBJECTIVE: Systemic lupus erythematosus (SLE) can present limitations to exercise capacity and quality of life (QoL) because of various clinical conditions, such as pulmonary disease or heart disease. Tissue Doppler echocardiography (TDE) offers the promise of an objective measurement to quantify regional and global ventricular function through the assessment of myocardial velocity data. This study aimed to assess the intensity of left ventricular (LV) and right ventricular (RV) systolic and diastolic dysfunction in SLE patients by means of TDE and cardiopulmonary exercise (CPX) testing to determine their impact on QoL...
September 2016: Eur J Rheumatol
Tania A Pawade, Timothy R G Cartlidge, William S A Jenkins, Philip D Adamson, Phillip Robson, Christophe Lucatelli, Edwin J R Van Beek, Bernard Prendergast, Alan R Denison, Laura Forsyth, James H F Rudd, Zahi A Fayad, Alison Fletcher, Sharon Tuck, David E Newby, Marc R Dweck
BACKGROUND: 18F-Fluoride positron emission tomography (PET) and computed tomography (CT) can measure disease activity and progression in aortic stenosis. Our objectives were to optimize the methodology, analysis, and scan-rescan reproducibility of aortic valve 18F-fluoride PET-CT imaging. METHODS AND RESULTS: Fifteen patients with aortic stenosis underwent repeated 18F-fluoride PET-CT. We compared nongated PET and noncontrast CT, with a modified approach that incorporated contrast CT and ECG-gated PET...
October 2016: Circulation. Cardiovascular Imaging
Oliver J Harrison, Narain Moorjani, Christopher Torrens, Sunil K Ohri, Felino R Cagampang
Bicuspid aortic valve (BAV) disease is the most common congenital cardiac abnormality and predisposes patients to life-threatening aortic complications including aortic aneurysm. Quantitative real-time reverse transcription PCR (qRT-PCR) is one of the most commonly used methods to investigate underlying molecular mechanisms involved in aortopathy. The accuracy of the gene expression data is dependent on normalization by appropriate housekeeping (HK) genes, whose expression should remain constant regardless of aortic valve morphology, aortic diameter and other factors associated with aortopathy...
2016: PloS One
Petra E Dijkman, Emanuela S Fioretta, Laura Frese, Francesco S Pasqualini, Simon P Hoerstrup
The incidence of severe valvular dysfunctions (e.g., stenosis and insufficiency) is increasing, leading to over 300,000 valves implanted worldwide yearly. Clinically used heart valve replacements lack the capacity to grow, inherently requiring repetitive and high-risk surgical interventions during childhood. The aim of this review is to present how different tissue engineering strategies can overcome these limitations, providing innovative valve replacements that proved to be able to integrate and remodel in pre-clinical experiments and to have promising results in clinical studies...
July 2016: Transfusion Medicine and Hemotherapy
Jeremy Ben-Shoshan, Arie Steinvil, Yaron Arbel, Yan Topilsky, Leehee Barak, Michal Entin-Meer, Ran Levy, Arie Lorin Schwartz, Gad Keren, Ariel Finkelstein, Shmuel Banai
BACKGROUND: Transcatheter aortic valve replacement (TAVR) exposes the systemic vasculature to increased mechanical forces. Endothelial adaptation to mechanical stimuli is associated with angiogenic activation through various growth factors. We studied the potential angiogenic shift evoked by TAVR. METHODS: From a cohort of 69 consecutive patients undergoing TAVR, we excluded patients with conditions known to affect angiogenic factors, and serum vascular endothelial growth factor (VEGF) and angiopoietin (Ang)-1 and Ang-2 were assessed by ELISA...
June 25, 2016: Canadian Journal of Cardiology
Ngoc Thien Lam, Timothy J Muldoon, Kyle P Quinn, Narasimhan Rajaram, Kartik Balachandran
The role of valvular interstitial cell (VIC) architecture in regulating cardiac valve function and pathology is not well understood. VICs are known to be more elongated in a hypertensive environment compared to those in a normotensive environment. We have previously reported that valve tissues cultured under hypertensive conditions are prone to acute pathological alterations in cell phenotype and contractility. We therefore aimed to rigorously study the relationship between VIC shape, contractile output and other functional indicators of VIC pathology...
October 10, 2016: Integrative Biology: Quantitative Biosciences From Nano to Macro
Carmen Rueda-Martínez, M Carmen Fernández, María Teresa Soto-Navarrete, Manuel Jiménez-Navarro, Ana Carmen Durán, Borja Fernández
Bicuspid aortic valve (BAV) is the most frequent congenital cardiac malformation in humans, and appears frequently associated with dilatation of the ascending aorta. This association is likely the result of a common aetiology. Currently, a Syrian hamster strain with a relatively high (∼40%) incidence of BAV constitutes the only spontaneous animal model of BAV disease. The characterization of molecular alterations in the aorta of hamsters with BAV may serve to identify pathophysiological mechanisms and molecular markers of disease in humans...
2016: PloS One
Napachanok Mongkoldhumrongkul, Najma Latif, Magdi H Yacoub, Adrian H Chester
Responses of valve endothelial cells (VECs) to shear stresses are important for the regulation of valve durability. However, the effect of flow patterns subjected to VECs on the opposite surfaces of the valves on the production of extracellular matrix (ECM) has not yet been investigated. This study aims to investigate the response of side-specific flow patterns, in terms of ECM synthesis and/or degradation in porcine aortic valves. Aortic and ventricular sides of aortic valve leaflets were exposed to oscillatory and laminar flow generated by a Cone-and-Plate machine for 48 h...
October 5, 2016: Cardiovascular Engineering and Technology
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"