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https://www.readbyqxmd.com/read/28811460/prevention-of-atrial-fibrillation-by-using-sarcoplasmic-reticulum-calcium-atpase-pump-overexpression-in-a-rabbit-model-of-rapid-atrial-pacing
#1
Hong Li Wang, Xian Hui Zhou, Zhi Qiang Li, Ping Fan, Qi Na Zhou, Yao Dong Li, Yue Mei Hou, Bao Peng Tang
BACKGROUND Recent research suggests that abnormal Ca2+ handling plays a role in the occurrence and maintenance of atrial fibrillation (AF). Therefore, Ca2+ release and ingestion depend on properties of the ryanodine receptor (RyR) and sarcoplasmic reticulum Ca2+ATPase2a (SERCA2a). This study aimed to detect whether SERCA2a gene overexpression has a preventive effect on atrial fibrillation caused by rapid pacing right atrium. MATERIAL AND METHODS Forty-eight New Zealand white rabbits were randomly divided into a control group, AF group, AAV9/GFP group, and AAV9/SERCA2a group...
August 16, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28810904/antiarrhythmic-drug-therapy-among-patients-presenting-to-emergency-department-with-symptomatic-atrial-fibrillation-a-prospective-nationwide-cohort
#2
Tero Penttilä, Heikki Mäkynen, Juha Hartikainen, Harri Hyppölä, Timo Lauri, Mika Lehto, Juha Lund, M J Pekka Raatikainen
BACKGROUND: Atrial fibrillation (AF) is a common arrhythmia that causes numerous visits to emergency departments (ED). The aim of the FinFib2 study was to evaluate whether treatment of patients with AF in ED is consistent with the contemporary European Society of Cardiology (ESC) management guidelines. Here we report the results of antiarrhythmic drug therapy (AAD) in ED. METHODS: All patients within the two-week study period whose primary reason for the ED visit was symptomatic AF were included into this prospective multicentre study...
August 15, 2017: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
https://www.readbyqxmd.com/read/28803858/in-silico-investigations-of-the-functional-impact-of-kcna5-mutations-on-atrial-mechanical-dynamics
#3
Haibo Ni, Ismail Adeniran, Henggui Zhang
A recent study has identified six novel genetic variations (D322H, E48G, A305T, D469E, Y155C, P488S) in KCNA5 (encoding Kv1.5 which carries the atrial-specific ultra-rapid delayed rectifier current, IKur) in patients with early onset of lone atrial fibrillation. These mutations are distinctive, resulting in either gain-of-function (D322H, E48G, A305T) or loss-of-function (D469E, Y155C, P488S) of IKur channels. Though affecting potassium channels, they may modulate the cellular active force and therefore atrial mechanical functions, which remains to be elucidated...
August 10, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28794054/cardiovascular-event-prediction-by-machine-learning-the-multi-ethnic-study-of-atherosclerosis
#4
Bharath Ambale-Venkatesh, Xiaoying Yang, Colin O Wu, Kiang Liu, W G Hundley, Robyn L McClelland, Antoinette S Gomes, Aaron R Folsom, Steven Shea, Eliseo Guallar, David A Bluemke, João A Lima
Rationale: Machine learning may be useful to characterize cardiovascular risk, predict outcomes and identify biomarkers in population studies. Objective: To test the ability of random survival forests (RF), a machine learning technique, to predict six cardiovascular outcomes in comparison to standard cardiovascular risk scores. Methods and Results: We included participants from the Multi-Ethnic Study of Atherosclerosis (MESA). Baseline measurements were used to predict cardiovascular outcomes over 12 years of follow-up...
August 9, 2017: Circulation Research
https://www.readbyqxmd.com/read/28793220/mechanism-for-triggered-waves-in-atrial-myocytes
#5
Yohannes Shiferaw, Gary L Aistrup, J Andrew Wasserstrom
Excitation-contraction coupling in atrial cells is mediated by calcium (Ca) signaling between L-type Ca channels and Ryanodine receptors that occurs mainly at the cell boundary. This unique architecture dictates essential aspects of Ca signaling under both normal and diseased conditions. In this study we apply laser scanning confocal microscopy, along with an experimentally based computational model, to understand the Ca cycling dynamics of an atrial cell subjected to rapid pacing. Our main finding is that when an atrial cell is paced under Ca overload conditions, Ca waves can then nucleate on the cell boundary and propagate to the cell interior...
August 8, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28765761/simulation-of-ventricular-rate-control-during-atrial-fibrillation-using-ionic-channel-blockers
#6
Shin Inada, Nitaro Shibata Md PhD, Michiaki Iwata PhD, Ryo Haraguchi PhD, Takashi Ashihara Md PhD, Takanori Ikeda Md PhD, Kazuyuki Mitsui PhD, Halina Dobrzynski PhD, Mark R Boyett PhD, Kazuo Nakazawa PhD
BACKGROUND: The atrioventricular (AV) node is the only compartment that conducts an electrical impulse between the atria and the ventricles. The main role of the AV node is to facilitate efficient pumping by conducting excitation slowly between the two chambers as well as reduce the ventricular rate during atrial fibrillation (AF). METHODS: Using computer simulations, we investigated excitation conduction from the right atrium to the bundle of His during high-rate atrial excitation with or without partial blocking of the calcium or potassium ionic current...
August 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28720711/gene-expression-networks-in-the-murine-pulmonary-myocardium-provide-insight-into-the-pathobiology-of-atrial-fibrillation
#7
Jordan K Boutilier, Rhonda L Taylor, Tracy Mann, Elyshia McNamara, Gary J Hoffman, Jacob Kenny, Rodney J Dilley, Peter Henry, Grant Morahan, Nigel G Laing, Kristen J Nowak
The pulmonary myocardium is a muscular coat surrounding the pulmonary and caval veins. Although its definitive physiological function is unknown, it may have a pathological role as the source of ectopic beats initiating atrial fibrillation. How the pulmonary myocardium gains pacemaker function is not clearly defined, although recent evidence indicates that changed transcriptional gene expression networks are at fault. The gene expression profile of this distinct cell type in situ was examined to investigate underlying molecular events that might contribute to atrial fibrillation...
July 18, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28701305/redox-and-activation-of-protein-kinase-a-dysregulates-calcium-homeostasis-in-pulmonary-vein-cardiomyocytes-of-chronic-kidney-disease
#8
Shih-Yu Huang, Yao-Chang Chen, Yu-Hsun Kao, Ming-Hsiung Hsieh, Yung-Kuo Lin, Shih-Ann Chen, Yi-Jen Chen
BACKGROUND: Chronic kidney disease (CKD) increases the occurrence of atrial fibrillation and pulmonary vein (PV) arrhythmogenesis. Calcium dysregulation and reactive oxygen species (ROS) enhance PV arrhythmogenic activity. The purposes of this study were to investigate whether CKD modulates PV electrical activity through dysregulation of calcium homeostasis and ROS. METHODS AND RESULTS: Biochemical and electrocardiographic studies were conducted in rabbits with and without CKD (induced by 150 mg/kg per day neomycin sulfate and 500 mg/kg per day cefazolin)...
July 12, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28648626/mechanosensitivity-of-microdomain-calcium-signalling-in-the-heart
#9
REVIEW
Patrick Schönleitner, Uli Schotten, Gudrun Antoons
In cardiac myocytes, calcium (Ca(2+)) signalling is tightly controlled in dedicated microdomains. At the dyad, i.e. the narrow cleft between t-tubules and junctional sarcoplasmic reticulum (SR), many signalling pathways combine to control Ca(2+)-induced Ca(2+) release during contraction. Local Ca(2+) gradients also exist in regions where SR and mitochondria are in close contact to regulate energetic demands. Loss of microdomain structures, or dysregulation of local Ca(2+) fluxes in cardiac disease, is often associated with oxidative stress, contractile dysfunction and arrhythmias...
June 23, 2017: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/28645513/atrial-fibrillation-current-therapies
#10
REVIEW
Romain Pariaut
A rate control or a rhythm control strategy can be applied to the management of atrial fibrillation. Rate control of atrial fibrillation consists of decreasing the ventricular response rate by limiting the number of supraventricular impulses that can travel through the atrioventricular node. The goal of decreasing heart rate in dogs with atrial fibrillation is usually achieved with a combination of the calcium channel blocker diltiazem and digoxin. Rhythm control of atrial fibrillation encompasses pharmacologic and nonpharmacologic methods to terminate the arrhythmia and restore sinus rhythm...
June 20, 2017: Veterinary Clinics of North America. Small Animal Practice
https://www.readbyqxmd.com/read/28645473/efficacy-and-safety-of-rivaroxaban-versus-warfarin-in-patients-taking-nondihydropyridine-calcium-channel-blockers-for-atrial-fibrillation-from-the-rocket-af-trial
#11
Jeffrey B Washam, Anne S Hellkamp, Yuliya Lokhnygina, Jonathan P Piccini, Scott D Berkowitz, Christopher C Nessel, Richard C Becker, Günter Breithardt, Keith A A Fox, Jonathan L Halperin, Graeme J Hankey, Kenneth W Mahaffey, Daniel E Singer, Manesh R Patel
Non-dihydropyridine calcium channel blockers (non-DHP CCBs) possess combined P-glycoprotein and moderate CYP3A4 inhibition, which may lead to increased exposure of medications that are substrates for these metabolic pathways, such as rivaroxaban. We evaluated the use and outcomes of non-DHP CCBs in patients with atrial fibrillation (AF) in Rivaroxaban Once Daily Oral Direct Factor Xa Inhibition Compared with Vitamin K Antagonism for Prevention of Stroke and Embolism Trial in Atrial Fibrillation (ROCKET AF)...
May 29, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28546098/altered-long-non-coding-rna-expression-profile-in-rabbit-atria-with-atrial-fibrillation-tcons_00075467-modulates-atrial-electrical-remodeling-by-sponging-mir-328-to-regulate-cacna1c
#12
Zhan Li, Ximin Wang, Weizong Wang, Juanjuan Du, Jinqiu Wei, Yong Zhang, Jiangrong Wang, Yinglong Hou
Electrical remodeling has been reported to play a major role in the initiation and maintenance of atrial fibrillation (AF). Long non-coding RNAs (lncRNAs) have been increasingly recognized as contributors to the pathology of heart diseases. However, the roles and mechanisms of lncRNAs in electrical remodeling during AF remain unknown. In this study, the lncRNA expression profiles of right atria were investigated in AF and non-AF rabbit models by using RNA sequencing technique and validated using quantitative real-time polymerase chain reaction (qRT-PCR)...
May 22, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28535166/adult-height-prevalent-coronary-calcium-score-and-incident-cardiovascular-outcomes-in-a-multi-ethnic-cohort
#13
Joseph Yeboah, Michael J Blaha, Erin D Michos, Waqas Qureshi, Michael Miedema, Peter Flueckiger, Carlos J Rodriguez, Moyses Szklo, Alain G Bertoni
We assessed the relationships among adult height, coronary artery calcium (CAC) scores, incident atherosclerotic cardiovascular disease (ASCVD) events, and atrial fibrillation (Afib) in a multi-ethnic cohort. We used race/ethnicity -specific height (dichotomized by median and quartiles) as the predictor variable within the four race/ethnic groups in the Multi-Ethnic Study of Atherosclerosis (N = 6,814). After a mean of 10.2 years of follow-up (2000-2012), 556 ASCVD events (8.2%) and 539 afib events (7.9%) occurred...
May 23, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28514017/isopimaric-acid-a-multi-targeting-ion-channel-modulator-reducing-excitability-and-arrhythmicity-in-a-spontaneously-beating-mouse-atrial-cell-line
#14
Sajjad Salari, Malin Silverå Ejneby, Johan Brask, Fredrik Elinder
AIM: Atrial fibrillation is the most common persistent cardiac arrhythmia, and it is not well controlled by present drugs. Because some resin acids open voltage-gated potassium channels and reduce neuronal excitability, we explored the effects of the resin acid isopimaric acid (IPA) on action potentials and ion currents in cardiomyocytes. METHODS: Spontaneously beating mouse atrial HL-1 cells were investigated with the whole-cell patch-clamp technique. RESULTS: 1-25 μmol L(-1) IPA reduced the action potential frequency by up to 50%...
May 17, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28495655/increased-sodium-calcium-exchanger-activity-enhances-beta-adrenergic-mediated-increase-in-heart-rate-whole-heart-study-in-a-homozygous-sodium-calcium-exchanger-overexpressor-mouse-model
#15
Sven Kaese, Nils Bögeholz, Paul Pauls, Dirk Dechering, Jan Olligs, Katharina Kölker, Sascha Badawi, Gerrit Frommeyer, Christian Pott, Lars Eckardt
BACKGROUND: The cardiac sodium/calcium (Na(+)/Ca(2+)) exchanger (NCX) contributes to diastolic depolarization in cardiac pacemaker cells. Increased NCX activity has been found in heart failure and atrial fibrillation. The influence of increased NCX activity on resting heart rate, beta-adrenergic-mediated increase in heart rate, and cardiac conduction properties is unknown. OBJECTIVE: The purpose of this study was to investigate the influence of NCX overexpression in a homozygous transgenic whole-heart mouse model (NCX-OE) on sinus and AV nodal function...
May 8, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28460029/mitral-annular-calcification-progression-and-the-risk-of-atrial-fibrillation-results-from-mesa
#16
Wesley T O'Neal, Jimmy T Efird, Saman Nazarian, Alvaro Alonso, Erin D Michos, Moses Szklo, Susan R Heckbert, Elsayed Z Soliman
Aims: To determine if progression of mitral annular calcium (MAC) detected by cardiac computed tomography (CT) predicts incident atrial fibrillation (AF). Methods and results: This analysis included 5683 participants (mean age 64 ± 10 years; 52% women; 40% whites; 27% blacks; 21% Hispanics; 12% Chinese-Americans) from the Multi-Ethnic Study of Atherosclerosis. MAC was measured by cardiac CT at baseline and at a follow-up CT scan over a mean time of 2.4 ± 0...
April 27, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28399139/ibutilide-treatment-protects-against-er-stress-induced-apoptosis-by-regulating-calumenin-expression-in-tunicamycin-treated-cardiomyocytes
#17
Yu Wang, Liying Xuan, Xiaoxue Cui, Yilin Wang, Shaoqing Chen, Chengxi Wei, Ming Zhao
BACKGROUND: Ibutilide, a class III antiarrhythmic agent has been shown to be cardioprotective in treating atrial fibrillation, promoting cardioconversion and recently this agent has been shown to protect against ER stress induced apoptosis in cardiomyocytes. In this study we begin to identify the mechanism by which ibutilide exerts its cardioprotection in tunicamycin treated cardiomyocytes. We examined ER stress markers including calumenin; a calcium binding ER chaperone protein that has recently been linked to ER stress in cardiomyocytes, in our treated cells...
2017: PloS One
https://www.readbyqxmd.com/read/28360032/multimodality-strategy-for-cardiovascular-risk-assessment-performance-in-2-population-based-cohorts
#18
James A de Lemos, Colby R Ayers, Benjamin Levine, Christopher R deFilippi, Thomas J Wang, W Gregory Hundley, Jarett D Berry, Stephen L Seliger, Darren K McGuire, Pamela Ouyang, Mark H Drazner, Matthew Budoff, Philip Greenland, Christie M Ballantyne, Amit Khera
BACKGROUND: Current strategies for cardiovascular disease (CVD) risk assessment among adults without known CVD are limited by suboptimal performance and a narrow focus on only atherosclerotic CVD (ASCVD). We hypothesized that a strategy combining promising biomarkers across multiple different testing modalities would improve global and atherosclerotic CVD risk assessment among individuals without known CVD. METHODS: We included participants from MESA (Multi-Ethnic Study of Atherosclerosis) (n=6621) and the Dallas Heart Study (n=2202) who were free from CVD and underwent measurement of left ventricular hypertrophy by ECG, coronary artery calcium, N-terminal pro B-type natriuretic peptide, high-sensitivity cardiac troponin T, and high-sensitivity C-reactive protein...
May 30, 2017: Circulation
https://www.readbyqxmd.com/read/28332202/calcium-signalling-silencing-in-atrial-fibrillation
#19
Maura Greiser
Subcellular calcium signalling silencing is a novel and distinct cellular and molecular adaptive response to rapid cardiac activation. Calcium signalling silencing develops during short-term sustained rapid atrial activation as seen clinically during paroxysmal atrial fibrillation (AF). It is the first 'anti-arrhythmic' adaptive response in the setting of AF and appears to counteract the maladaptive changes that lead to intracellular Ca(2+) signalling instability and Ca(2+) -based arrhythmogenicity. Calcium signalling silencing results in a failed propagation of the [Ca(2+) ]i signal to the myocyte centre both in patients with AF and in a rabbit model...
June 15, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28322838/effect-of-antiarrhythmic-drugs-on-small-conductance-calcium-activated-potassium-channels
#20
Rafel Simó-Vicens, Daniel R P Sauter, Morten Grunnet, Jonas G Diness, Bo H Bentzen
Atrial fibrillation (AF) is the most common type of arrhythmia. Current pharmacological treatment for AF is moderately effective and/or increases the risk of serious ventricular adverse effects. To avoid ventricular adverse effects, a new target has been considered, the small conductance calcium-activated K(+) channels (KCa2.X, SK channels). In the heart, KCa2.X channels are functionally more important in atria compared to ventricles, and pharmacological inhibition of the channel confers atrial selective prolongation of the cardiac action potential and converts AF to sinus rhythm in animal models of AF...
May 15, 2017: European Journal of Pharmacology
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