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https://www.readbyqxmd.com/read/27906101/characterization-of-a-dmd-egfp-reporter-mouse-as-a-tool-to-investigate-dystrophin-expression
#1
Mina V Petkova, Susanne Morales-Gonzales, Karima Relizani, Esther Gill, Franziska Seifert, Josefine Radke, Werner Stenzel, Luis Garcia, Helge Amthor, Markus Schuelke
BACKGROUND: Dystrophin is a rod-shaped cytoplasmic protein that provides sarcolemmal stability as a structural link between the cytoskeleton and the extracellular matrix via the dystrophin-associated protein complex (DAPC). Mutations in the dystrophin-encoding DMD gene cause X-linked dystrophinopathies with variable phenotypes, the most severe being Duchenne muscular dystrophy (DMD) characterized by progressive muscle wasting and fibrosis. However, dystrophin deficiency does not only impair the function of skeletal and heart muscle but may also affect other organ systems such as the brain, eye, and gastrointestinal tract...
July 5, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27899284/defective-lymphatic-valve-development-and-chylothorax-in-mice-with-a-lymphatic-specific-deletion-of-connexin43
#2
Stephanie J Munger, Michael J Davis, Alexander M Simon
Lymphatic valves (LVs) are cusped luminal structures that permit the movement of lymph in only one direction and are therefore critical for proper lymphatic vessel function. Congenital valve aplasia or agenesis can, in some cases, be a direct cause of lymphatic disease. Knowledge about the molecular mechanisms operating during the development and maintenance of LVs may thus aid in the establishment of novel therapeutic approaches to treat lymphatic disorders. In this study, we examined the role of Connexin43 (Cx43), a gap junction protein expressed in lymphatic endothelial cells (LECs), during valve development...
November 26, 2016: Developmental Biology
https://www.readbyqxmd.com/read/27895476/community-based-exercise-training-for-people-with-chronic-respiratory-and-chronic-cardiac-disease-a-mixed-methods-evaluation
#3
Renae J McNamara, Zoe J McKeough, Laura R Mo, Jamie T Dallimore, Sarah M Dennis
BACKGROUND: Poor uptake and adherence are problematic for hospital-based pulmonary and heart failure rehabilitation programs, often because of access difficulties. The aims of this mixed-methods study were to determine the feasibility of a supervised exercise training program in a community gymnasium in people with chronic respiratory and chronic cardiac disease, to explore the experiences of participants and physiotherapists and to determine if a community venue improved access and adherence to rehabilitation...
2016: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/27888991/pulmonary-function-and-adverse-cardiovascular-outcomes-can-cardiac-function-explain-the-link
#4
Melissa S Burroughs Peña, Allison Dunning, Phillip J Schulte, Michael T Durheim, Peter Kussin, William Checkley, Eric J Velazquez
BACKGROUND: The complex interaction between pulmonary function, cardiac function and adverse cardiovascular events has only been partially described. We sought to describe the association between pulmonary function with left heart structure and function, all-cause mortality and incident cardiovascular hospitalization. METHODS: This study is a retrospective analysis of patients evaluated in a single tertiary care medical center. We used multivariable linear regression analyses to examine the relationship between FVC and FEV1 with left ventricular ejection fraction (LVEF), left ventricular internal dimension in systole and diastole (LVIDS, LVIDD) and left atrial diameter, adjusting for baseline characteristics, right ventricular function and lung hyperinflation...
December 2016: Respiratory Medicine
https://www.readbyqxmd.com/read/27883210/rationale-and-design-of-the-bayes-interatrial-block-and-yearly-events-registry
#5
Manuel Martínez-Sellés, Adrian Baranchuk, Roberto Elosua, Antonio Bayés de Luna
The prevalence of interatrial block (IAB) is high in the elderly, particularly in those with heart disease. Despite this high prevalence-and the association of IAB with the risk of atrial fibrillation (AF), stroke, and cognitive decline-little information exists about the prognosis of older patients with IAB. P-wave duration and morphology are associated with risk of developing AF, stroke, and cognitive decline in elderly patients with structural heart disease. The aim of the Interatrial Block and Yearly Events (BAYES) registry is to assess the impact of IAB on the risk of AF and stroke during 3 years of follow-up...
November 24, 2016: Clinical Cardiology
https://www.readbyqxmd.com/read/27881552/cardiac-t-tubule-microanatomy-and-function
#6
REVIEW
TingTing Hong, Robin M Shaw
Unique to striated muscle cells, transverse tubules (t-tubules) are membrane organelles that consist of sarcolemma penetrating into the myocyte interior, forming a highly branched and interconnected network. Mature t-tubule networks are found in mammalian ventricular cardiomyocytes, with the transverse components of t-tubules occurring near sarcomeric z-discs. Cardiac t-tubules contain membrane microdomains enriched with ion channels and signaling molecules. The microdomains serve as key signaling hubs in regulation of cardiomyocyte function...
January 2017: Physiological Reviews
https://www.readbyqxmd.com/read/27878633/cardiopulmonary-exercise-testing-in-fontan-patients-with-and-without-isomerism-heterotaxy-as-compared-to-patients-with-primary-ciliary-dyskinesia-and-subjects-with-structurally-normal-hearts
#7
Rohit S Loomba, Michael Danduran, Kim G Nielsen, Astrid M Ring, Joshua Kovach, Robert H Anderson
Isomerism, also known as heterotaxy, is a clinical entity that impacts multiple organ systems both anatomically and functionally. The airways and lungs are involved in a great number of these patients, leading to increased sinopulmonary symptoms, increased need for oxygenation, and increased postoperative ventilatory support. Additionally, these patients often have congenital heart disease requiring Fontan palliation. What has not been previously described, and is the focus of this study, is the results of cardiopulmonary exercise testing in those who have undergone Fontan palliation with and without isomerism...
November 23, 2016: Pediatric Cardiology
https://www.readbyqxmd.com/read/27872872/quantitative-analysis-of-hypertrophic-myocardium-using-diffusion-tensor-magnetic-resonance-imaging
#8
Nicholas Tran, Archontis Giannakidis, Grant T Gullberg, Youngho Seo
Systemic hypertension is a causative factor in left ventricular hypertrophy (LVH). This study is motivated by the potential to reverse or manage the dysfunction associated with structural remodeling of the myocardium in this pathology. Using diffusion tensor magnetic resonance imaging, we present an analysis of myocardial fiber and laminar sheet orientation in ex vivo hypertrophic (6 SHR) and normal (5 WKY) rat hearts using the covariance of the diffusion tensor. First, an atlas of normal cardiac microstructure was formed using the WKY b0 images...
October 2016: Journal of Medical Imaging
https://www.readbyqxmd.com/read/27871197/left-ventricular-assist-device-induced-reverse-remodeling-it-s-not-just-about-myocardial-recovery
#9
Karolina K Marinescu, Nir Uriel, Douglas L Mann, Daniel Burkhoff
The abnormal structure, function and molecular makeup of dilated cardiomyopathic hearts can be partially normalized in patients supported by a left ventricular assist device (LVAD), a process called reverse remodeling. This leads to recovery of function in many patients, though the rate of full recovery is low and in many cases is temporary, leading to the concept of heart failure remission, rather than recovery. Areas covered: We summarize data indicative of ventricular reverse remodeling, recovery and remission during LVAD support...
November 22, 2016: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/27870979/coronary-disease-risk-assessment-in-men-comparison-between-ascvd-risk-versus-framingham
#10
Natália Maria Maciel Guerra-Silva, Fernanda Sene Santucci, Ricardo Castanho Moreira, Cristiano Massao Tashima, Simone Cristina Castanho Sabaini de Melo, Leonardo Regis Leira Pereira, Debora de Mello Gonçales Sant'Ana
INTRODUCTION: This study evaluated the risk of men developing coronary heart disease and its determinant variables, comparing these results through two validated coronary risk scales. METHODS: A cross sectional epidemiological analytical study in which data were collected by spontaneous demand, through a semi-structured questionnaire, clinical examination, and blood collection. The Chi-square test, logistic regression and Kappa for statistical analysis were performed...
November 9, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27843325/the-role-of-the-multidisciplinary-health-care-team-in-the-management-of-patients-with-marfan-syndrome
#11
REVIEW
Yskert von Kodolitsch, Meike Rybczynski, Marina Vogler, Thomas S Mir, Helke Schüler, Kerstin Kutsche, Georg Rosenberger, Christian Detter, Alexander M Bernhardt, Axel Larena-Avellaneda, Tilo Kölbel, E Sebastian Debus, Malte Schroeder, Stephan J Linke, Bettina Fuisting, Barbara Napp, Anna Lena Kammal, Klaus Püschel, Peter Bannas, Boris A Hoffmann, Nele Gessler, Eva Vahle-Hinz, Bärbel Kahl-Nieke, Götz Thomalla, Christina Weiler-Normann, Gunda Ohm, Stefan Neumann, Dieter Benninghoven, Stefan Blankenberg, Reed E Pyeritz
Marfan syndrome (MFS) is a rare, severe, chronic, life-threatening disease with multiorgan involvement that requires optimal multidisciplinary care to normalize both prognosis and quality of life. In this article, each key team member of all the medical disciplines of a multidisciplinary health care team at the Hamburg Marfan center gives a personal account of his or her contribution in the management of patients with MFS. The authors show how, with the support of health care managers, key team members organize themselves in an organizational structure to create a common meaning, to maximize therapeutic success for patients with MFS...
2016: Journal of Multidisciplinary Healthcare
https://www.readbyqxmd.com/read/27834761/three-dimensional-visualization-of-human-cardiac-conduction-tissue-in-whole-heart-specimens-by-high-resolution-phase-contrast-ct-imaging-using-synchrotron-radiation
#12
Gen Shinohara, Kiyozo Morita, Masato Hoshino, Yoshihiro Ko, Takuro Tsukube, Yukihiro Kaneko, Hiroyuki Morishita, Yoshihiro Oshima, Hironori Matsuhisa, Ryuma Iwaki, Masashi Takahashi, Takaaki Matsuyama, Kazuhiro Hashimoto, Naoto Yagi
BACKGROUND: The feasibility of synchrotron radiation-based phase-contrast computed tomography (PCCT) for visualization of the atrioventricular (AV) conduction axis in human whole heart specimens was tested using four postmortem structurally normal newborn hearts obtained at autopsy. METHODS: A PCCT imaging system at the beamline BL20B2 in a SPring-8 synchrotron radiation facility was used. The PCCT imaging of the conduction system was performed with "virtual" slicing of the three-dimensional reconstructed images...
November 2016: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/27832782/quantitative-evaluation-of-longitudinal-strain-in-layer-specific-myocardium-during-normal-pregnancy-in-china
#13
Juan Cong, Zhibin Wang, Hong Jin, Wugang Wang, Kun Gong, Yuanyuan Meng, Yong Lee
BACKGROUND: The myocardial wall of the left ventricle is a complex, multilayered structure and is not homogenous. The aim of this study was to determine longitudinal strain (LS) in the three myocardial layers in normal pregnant women according to gestation proceedings. METHODS: The advanced two-dimensional speckle tracking echocardiography (2D STE) was performed on 62 women during each pregnancy trimester and 6 to 9 weeks after delivery, while 30 age-matched, healthy, nonpregnant women served as controls...
November 10, 2016: Cardiovascular Ultrasound
https://www.readbyqxmd.com/read/27831631/stem-cells-differentiation-and-probing-their-therapeutic-applications-in-hematological-disorders-a-critical-review
#14
F Ali, S Taresh, M Al-Nuzaily, P L Mok, A Ismail, S Ahmad
Numerous lines of evidence support that bone marrow is a rich source of stem cells that can be used for research purposes and to treat some complex blood diseases and cancers. Stem cells are a potential source for regenerative medicine and tissue replacement after injury or disease, and mother cells that possess the capacity to become any type of cell in the body. They are cells without specific structure and characterized by their ability to self-renew or multiply while maintaining the potential to develop into other types of cells...
October 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27830886/anomalous-left-brachiocephalic-vein-important-vascular-anomaly-concomitant-with-congenital-anomalies-and-heart-diseases
#15
Shahram Kahkouee, Makan Sadr, Elham Pedarzadeh, Sara Fardin, Ali Borhani, Saeid Gholami, Ghazaleh Amjad
BACKGROUND: Anomalous left brachiocephalic vein (ALBCV) is a rare and less known systemic venous anomaly. Infrequently, this vein takes an abnormal course and passes to the right behind or beneath the aortic arch to create the superior vena cava (SVC). Its incidence was reported much higher in patients with congenital heart disease (CHD) especially in conotruncal and aortic arch anomalies. It could be misdiagnosed with normal or abnormal mediastinal structures. It also could make complication during surgeries or invasive strategies...
November 10, 2016: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/27826348/complete-heart-block-in-association-with-dengue-hemorrhagic-fever
#16
Hafeez Ul Hassan Virk, Faisal Inayat, Zia Ur Rahman
Dengue virus infection affects the heart structurally and functionally. Clinical manifestations of cardiac complications secondary to dengue virus infection vary from self-limiting arrhythmias to severe myocardial infarction, leading to hypotension, pulmonary edema, and cardiogenic shock. However, we report a case of dengue hemorrhagic fever (DHF) complicated by a complete heart block. A female with DHF due to dengue virus serotype 2, presented to the emergency department with fever, headache, rash, and fatigue followed by an episode of syncope...
November 2016: Korean Circulation Journal
https://www.readbyqxmd.com/read/27824910/3d-finite-element-electrical-model-of-larval-zebrafish-ecg-signals
#17
James Crowcombe, Sundeep Singh Dhillon, Rhiannon Mary Hurst, Stuart Egginton, Ferenc Müller, Attila Sík, Edward Tarte
Assessment of heart function in zebrafish larvae using electrocardiography (ECG) is a potentially useful tool in developing cardiac treatments and the assessment of drug therapies. In order to better understand how a measured ECG waveform is related to the structure of the heart, its position within the larva and the position of the electrodes, a 3D model of a 3 days post fertilisation (dpf) larval zebrafish was developed to simulate cardiac electrical activity and investigate the voltage distribution throughout the body...
2016: PloS One
https://www.readbyqxmd.com/read/27818308/i-wire-heart-on-a-chip-i-three-dimensional-cardiac-tissue-constructs-for-physiology-and-pharmacology
#18
Veniamin Y Sidorov, Philip C Samson, Tatiana N Sidorova, Jeffrey M Davidson, Chee C Lim, John P Wikswo
Engineered 3D cardiac tissue constructs (ECTCs) can replicate complex cardiac physiology under normal and pathological conditions. Currently, most measurements of ECTC contractility are either made isometrically, with fixed length and without control of the applied force, or auxotonically against a variable force, with the length changing during the contraction. The "I-Wire" platform addresses the unmet need to control the force applied to ECTCs while interrogating their passive and active mechanical and electrical characteristics...
November 3, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27815140/transcutaneous-direct-current-cardioversion-in-a-foal-with-lone-atrial-fibrillation
#19
B M Potter, B A Scansen, L K Dunbar, S M Reed, R E Toribio
There are rare published reports of atrial fibrillation (AF) in foals, all of which are associated with structural heart disease or within the adaptive period of newborns. This report describes a 3-month-old Thoroughbred filly with AF and a structurally normal heart on echocardiography. Medical cardioversion of the foal's AF was attempted with three 20mg/kg doses of quinidine sulfate therapy without success. Timed, transcutaneous, direct current cardioversion was successfully performed using adhesive patches on the midthorax in conjunction with intravenous procainamide at a total dose of 20mg/kg...
November 1, 2016: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/27810292/special-electrophysiological-characteristics-of-pediatric-idiopathic-ventricular-tachycardia
#20
Shuenn-Nan Chiu, Wei-Lun Wu, Chun-Wei Lu, Kun-Lang Wu, Wei-Chieh Tseng, Ming-Tai Lin, Chien-Chih Chang, Jou-Kou Wang, Mei-Hwan Wu
BACKGROUND: Idiopathic ventricular tachycardia (VT) is an important pediatric arrhythmia but relevant studies in Asian cohort are rare. We determined the electrophysiological characteristics and outcomes of this rhythm disturbance. METHODS: From an institutional database, patients aged <18years without structural heart disease who have sustained monomorphic VT (longer than 30s) during 1995-2016 were enrolled. RESULTS: We enrolled 57 idiopathic VT patients (male:female=31:26)...
October 29, 2016: International Journal of Cardiology
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