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Atrial electrical remodeling

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https://www.readbyqxmd.com/read/28596994/recurrent-post-ablation-paroxysmal-atrial-fibrillation-shares-substrates-with-persistent-atrial-fibrillation-an-11-center-study
#1
Junaid A B Zaman, Tina Baykaner, Paul Clopton, Vijay Swarup, Robert C Kowal, James P Daubert, John D Day, John Hummel, Amir A Schricker, David E Krummen, Moussa Mansour, Gery F Tomassoni, Kevin R Wheelan, Mohan Vishwanathan, Shirley Park, Paul J Wang, Sanjiv M Narayan, John M Miller
INTRODUCTION: The role of atrial fibrillation (AF) substrates is unclear in patients with paroxysmal AF (PAF) that recurs after pulmonary vein isolation (PVI). We hypothesized that patients with recurrent post-ablation (redo) PAF despite PVI have electrical substrates marked by rotors and focal sources, and structural substrates that resemble persistent AF more than patients with (de novo) PAF at first ablation. METHODS: In 175 patients at 11 centers, we compared AF substrates in both atria using 64 pole-basket catheters and phase mapping, and indices of anatomical remodeling between patients with de novo or redo PAF and first ablation for persistent AF...
April 2017: JACC. Clinical Electrophysiology
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
#2
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/28546006/atrial-myofibroblast-activation-and-connective-tissue-formation-in-a-porcine-model-of-atrial-fibrillation-and-reduced-left-ventricular-function
#3
Patrick Lugenbiel, Fabian Wenz, Katharina Govorov, Pascal Syren, Hugo A Katus, Dierk Thomas
AIMS: Atrial fibrillation (AF) is associated with fibrosis that slows electrical conduction and causes perpetuation of the arrhythmia. The molecular characterization of AF pathophysiology may provide novel therapeutic options. This study was designed to elucidate profibrotic signaling and myofibroblast activation in a porcine model of atrial tachypacing-induced AF and reduced left ventricular function. MATERIALS AND METHODS: Ten domestic pigs were randomized to sinus rhythm (SR) or AF groups...
July 15, 2017: Life Sciences
https://www.readbyqxmd.com/read/28515003/reverse-atrial-electrical-remodeling-induced-by-cardiac-resynchronization-therapy
#4
Bryce Alexander, Fariha Sadiq, Kousha Azimi, Benedict Glover, Pavel Antiperovitch, Wilma M Hopman, Zardasht Jaff, Adrian Baranchuk
PURPOSE: Cardiac resynchronization therapy (CRT) has been shown to improve left atrial function; however the effect on reverse electrical remodeling has been poorly evaluated. We hypothesized that CRT might induce reverse atrial electrical remodeling manifesting in the surface ECG as a shortening in P-wave duration. METHODS: Patients with CRT and more than 92% biventricular pacing at minimum follow-up of 1 year were included in the analysis. Those with prior history of atrial fibrillation (AF) were excluded...
April 28, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28510575/electro-mechanical-dynamics-of-spiral-waves-in-a-discrete-2d-model-of-human-atrial-tissue
#5
Paul Brocklehurst, Haibo Ni, Henggui Zhang, Jianqiao Ye
We investigate the effect of mechano-electrical feedback and atrial fibrillation induced electrical remodelling (AFER) of cellular ion channel properties on the dynamics of spiral waves in a discrete 2D model of human atrial tissue. The tissue electro-mechanics are modelled using the discrete element method (DEM). Millions of bonded DEM particles form a network of coupled atrial cells representing 2D cardiac tissue, allowing simulations of the dynamic behaviour of electrical excitation waves and mechanical contraction in the tissue...
2017: PloS One
https://www.readbyqxmd.com/read/28506917/atrial-antitachycardia-pacing-and-atrial-remodeling-a-substudy-of-the-international-randomized-minerva-trial
#6
Giuseppe Boriani, Raymond Tukkie, Mauro Biffi, Lluis Mont, Renato Ricci, Helmut Pürerfellner, Giovanni Luca Botto, Antonis S Manolis, Maurizio Landolina, Michele Gulizia, J Harrison Hudnall, Lorenza Mangoni, Andrea Grammatico, Luigi Padeletti
BACKGROUND: Atrial tachycardia (AT) and atrial fibrillation (AF) are common in pacemaker patients and are associated with bad prognoses. OBJECTIVE: The purpose of this study was to evaluate atrial antitachycardia pacing impact on AT/AF-induced atrial remodeling, measured by early recurrence of AT/AF (ERAF) and by change in left atrial diameter (LAD), and to evaluate the impact of AT/AF duration on ERAF incidence. METHODS: Pacemaker patients were randomized to dual-chamber pacing (Control DDDR: 385 patients), managed ventricular pacing (MVP: 398 patients), or atrial antitachycardia pacing plus MVP (DDDRP+MVP: 383 patients)...
May 12, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28494969/rate-dependent-role-of-ikur-in-human-atrial-repolarization-and-atrial-fibrillation-maintenance
#7
Martin Aguilar, Jianlin Feng, Edward Vigmond, Philippe Comtois, Stanley Nattel
The atrial-specific ultrarapid delayed rectifier K(+) current (IKur) inactivates slowly but completely at depolarized voltages. The consequences for IKur rate-dependence have not been analyzed in detail and currently available mathematical action-potential (AP) models do not take into account experimentally observed IKur inactivation dynamics. Here, we developed an updated formulation of IKur inactivation that accurately reproduces time-, voltage-, and frequency-dependent inactivation. We then modified the human atrial cardiomyocyte Courtemanche AP model to incorporate realistic IKur inactivation properties...
May 9, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28484965/the-protective-role-of-small-heat-shock-proteins-in-cardiac-diseases-key-role-in-atrial-fibrillation
#8
Xu Hu, Denise M S Van Marion, Marit Wiersma, Deli Zhang, Bianca J J M Brundel
Atrial fibrillation (AF) is the most common tachyarrhythmia which is associated with increased morbidity and mortality. AF usually progresses from a self-terminating paroxysmal to persistent disease. It has been recognized that AF progression is driven by structural remodeling of cardiomyocytes, which results in electrical and contractile dysfunction of the atria. We recently showed that structural remodeling is rooted in derailment of proteostasis, i.e., homeostasis of protein production, function, and degradation...
July 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28450367/atrial-fibrillation-epidemiology-pathophysiology-and-clinical-outcomes
#9
REVIEW
Laila Staerk, Jason A Sherer, Darae Ko, Emelia J Benjamin, Robert H Helm
The past 3 decades have been characterized by an exponential growth in knowledge and advances in the clinical treatment of atrial fibrillation (AF). It is now known that AF genesis requires a vulnerable atrial substrate and that the formation and composition of this substrate may vary depending on comorbid conditions, genetics, sex, and other factors. Population-based studies have identified numerous factors that modify the atrial substrate and increase AF susceptibility. To date, genetic studies have reported 17 independent signals for AF at 14 genomic regions...
April 28, 2017: Circulation Research
https://www.readbyqxmd.com/read/28449044/vernakalant-does-not-alter-early-repolarization-or-contractility-in-normal-and-electrically-remodelled-atria
#10
Arne van Hunnik, Hussein Nasrallah, Dennis H Lau, Marion Kuiper, Sander Verheule, Ulrich Schotten
Aims: Besides the inhibition of the sodium inward current, vernakalant also inhibits the ultra rapid rectifier (IKur) and transient outward current (Ito). Inhibition of these currents increases contractility in canine atrial myocytes and goat atria. We investigated the effect of vernakalant on early repolarization and contractility in normal and electrically remodelled atria. Methods and results: Goats were implanted a pressure catheter, piezoelectric crystals, and electrodes to obtain atrial contractility and effective refractory period (ERP)...
April 25, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28447159/catheter-ablation-of-persistent-atrial-fibrillation-beneficial-effect-of-a%C3%A2-short-term-adjunctive-amiodarone-therapy-on-the-long-term-outcome
#11
Klaus Kettering, Felix Gramley
BACKGROUND: Catheter ablation has become the first line therapy in patients with symptomatic, recurrent, drug-refractory atrial fibrillation. Circumferential pulmonary vein ablation is still the standard approach in these patients. However, the results are not very favorable (especially in patients with persistent atrial fibrillation). Therefore, more complex ablation strategies and the usefulness of (short-term) adjunctive antiarrhythmic drug therapy are a matter of discussion. The aim of this study was to analyze whether short-term amiodarone therapy after catheter ablation (3 months) has a positive effect on the success rates after circumferential pulmonary vein ablation in patients with persistent atrial fibrillation...
April 26, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28424890/left-atrial-electromechanical-conduction-time-predicts-atrial-fibrillation-in-patients-with-mitral-stenosis-a-5-year-follow-up-speckle-tracking-echocardiography-study
#12
Ozkan Candan, Cetin Gecmen, Arzu Kalayci, Cem Dogan, Emrah Bayam, Mehmet Ozkan
Prolonged left atrial electromechanical conduction time is related with atrial electrical remodeling, and is predictive of the development of atrial fibrillation. The aim of our study was to examine whether left atrial electromechanical conduction time (EMT) and left atrial strain as measured by speckle tracking echocardiography (STE) are predictors for the development of atrial fibrillation (AF) in patients with mitral stenosis (MS) at 5-year follow-up. A total of 81 patients (61% females; mean age 38.1 ± 12...
April 19, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28416818/large-scale-analyses-of-common-and-rare-variants-identify-12-new-loci-associated-with-atrial-fibrillation
#13
Ingrid E Christophersen, Michiel Rienstra, Carolina Roselli, Xiaoyan Yin, Bastiaan Geelhoed, John Barnard, Honghuang Lin, Dan E Arking, Albert V Smith, Christine M Albert, Mark Chaffin, Nathan R Tucker, Molong Li, Derek Klarin, Nathan A Bihlmeyer, Siew-Kee Low, Peter E Weeke, Martina Müller-Nurasyid, J Gustav Smith, Jennifer A Brody, Maartje N Niemeijer, Marcus Dörr, Stella Trompet, Jennifer Huffman, Stefan Gustafsson, Claudia Schurmann, Marcus E Kleber, Leo-Pekka Lyytikäinen, Ilkka Seppälä, Rainer Malik, Andrea R V R Horimoto, Marco Perez, Juha Sinisalo, Stefanie Aeschbacher, Sébastien Thériault, Jie Yao, Farid Radmanesh, Stefan Weiss, Alexander Teumer, Seung Hoan Choi, Lu-Chen Weng, Sebastian Clauss, Rajat Deo, Daniel J Rader, Svati H Shah, Albert Sun, Jemma C Hopewell, Stephanie Debette, Ganesh Chauhan, Qiong Yang, Bradford B Worrall, Guillaume Paré, Yoichiro Kamatani, Yanick P Hagemeijer, Niek Verweij, Joylene E Siland, Michiaki Kubo, Jonathan D Smith, David R Van Wagoner, Joshua C Bis, Siegfried Perz, Bruce M Psaty, Paul M Ridker, Jared W Magnani, Tamara B Harris, Lenore J Launer, M Benjamin Shoemaker, Sandosh Padmanabhan, Jeffrey Haessler, Traci M Bartz, Melanie Waldenberger, Peter Lichtner, Marina Arendt, Jose E Krieger, Mika Kähönen, Lorenz Risch, Alfredo J Mansur, Annette Peters, Blair H Smith, Lars Lind, Stuart A Scott, Yingchang Lu, Erwin B Bottinger, Jussi Hernesniemi, Cecilia M Lindgren, Jorge A Wong, Jie Huang, Markku Eskola, Andrew P Morris, Ian Ford, Alex P Reiner, Graciela Delgado, Lin Y Chen, Yii-Der Ida Chen, Roopinder K Sandhu, Man Li, Eric Boerwinkle, Lewin Eisele, Lars Lannfelt, Natalia Rost, Christopher D Anderson, Kent D Taylor, Archie Campbell, Patrik K Magnusson, David Porteous, Lynne J Hocking, Efthymia Vlachopoulou, Nancy L Pedersen, Kjell Nikus, Marju Orho-Melander, Anders Hamsten, Jan Heeringa, Joshua C Denny, Jennifer Kriebel, Dawood Darbar, Christopher Newton-Cheh, Christian Shaffer, Peter W Macfarlane, Stefanie Heilmann-Heimbach, Peter Almgren, Paul L Huang, Nona Sotoodehnia, Elsayed Z Soliman, Andre G Uitterlinden, Albert Hofman, Oscar H Franco, Uwe Völker, Karl-Heinz Jöckel, Moritz F Sinner, Henry J Lin, Xiuqing Guo, Martin Dichgans, Erik Ingelsson, Charles Kooperberg, Olle Melander, Ruth J F Loos, Jari Laurikka, David Conen, Jonathan Rosand, Pim van der Harst, Marja-Liisa Lokki, Sekar Kathiresan, Alexandre Pereira, J Wouter Jukema, Caroline Hayward, Jerome I Rotter, Winfried März, Terho Lehtimäki, Bruno H Stricker, Mina K Chung, Stephan B Felix, Vilmundur Gudnason, Alvaro Alonso, Dan M Roden, Stefan Kääb, Daniel I Chasman, Susan R Heckbert, Emelia J Benjamin, Toshihiro Tanaka, Kathryn L Lunetta, Steven A Lubitz, Patrick T Ellinor
Atrial fibrillation affects more than 33 million people worldwide and increases the risk of stroke, heart failure, and death. Fourteen genetic loci have been associated with atrial fibrillation in European and Asian ancestry groups. To further define the genetic basis of atrial fibrillation, we performed large-scale, trans-ancestry meta-analyses of common and rare variant association studies. The genome-wide association studies (GWAS) included 17,931 individuals with atrial fibrillation and 115,142 referents; the exome-wide association studies (ExWAS) and rare variant association studies (RVAS) involved 22,346 cases and 132,086 referents...
June 2017: Nature Genetics
https://www.readbyqxmd.com/read/28379329/median-nerve-stimulation-prevents-atrial-electrical-remodelling-and-inflammation-in-a-canine-model-with-rapid-atrial-pacing
#14
Qingyan Zhao, Shudi Zhang, Hongyi Zhao, Shujuan Zhang, Zixuan Dai, Yongsheng Qian, Youjing Zhang, Xi Wang, Yanhong Tang, Congxin Huang
Aims: Studies have shown that stellate ganglion nerve activity has association with atrial electrical remodelling and atrial fibrillation (AF) inducibility, while median nerve stimulation (MNS) decreases cardiac sympathetic drive. In this study, we tested the hypothesis that MNS suppresses atrial electrical remodelling and AF vulnerability. Methods and results: The atrial effective refractory period (AERP) and AF inducibility at baseline and after 3 h of rapid atrial pacing were determined in dogs undergoing MNS (n = 7), MNS+ application of methyllycaconitine (n = 7) or sham procedure (n = 6)...
March 31, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28338788/hypertension-and-atrial-fibrillation-an-intimate-association-of-epidemiology-pathophysiology-and-outcomes
#15
Mikhail S Dzeshka, Farhan Shahid, Alena Shantsila, Gregory Y H Lip
Atrial fibrillation (AF) is the most prevalent sustained arrhythmia found in clinical practice. AF rarely exists as a single entity but rather as part of a diverse clinical spectrum of cardiovascular diseases, related to structural and electrical remodeling within the left atrium, leading to AF onset, perpetuation, and progression. Due to the high overall prevalence within the AF population arterial hypertension plays a significant role in the pathogenesis of AF and its complications. Fibroblast proliferation, apoptosis of cardiomyocytes, gap junction remodeling, accumulation of collagen both in atrial and ventricular myocardium all accompany ageing-related structural remodeling with impact on electrical activity...
February 18, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/28335897/mitral-loop-cerclage-annuloplasty-for-secondary-mitral-regurgitation-first-human-results
#16
Yong-Hyun Park, Min-Ku Chon, Robert J Lederman, Si-Chan Sung, Hyung-Gon Je, Ki-Seok Choo, Sang-Hyun Lee, Eun-Seok Shin, Jeong-Su Kim, Ki-Won Hwang, Soo-Yong Lee, Kook-Jin Chun, Cheol-Min Kim, June-Hong Kim
OBJECTIVES: This is an early feasibility clinical test of mitral loop cerclage annuloplasty to treat secondary mitral valve regurgitation. BACKGROUND: Secondary mitral regurgitation is characterized by cardiomyopathy, mitral annular enlargement, and leaflet traction contributing to malcoaptation. Transcatheter mitral loop cerclage applies circumferential compression to the mitral annulus by creating a loop through the coronary sinus across the interventricular septum, protecting entrapped coronary arteries from compression, and interactive annular reduction under echocardiographic guidance...
March 27, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28320744/angiotensin-converting-enzyme-inhibitors-and-angiotensin-ii-receptor-blockers-are-associated-with-improved-outcome-but-do-not-prevent-new-onset-atrial-fibrillation-after-acute-myocardial-infarction
#17
Gorav Batra, Lars Lindhagen, Pontus Andell, David Erlinge, Stefan James, Jonas Spaak, Jonas Oldgren
BACKGROUND: Treatment with renin-angiotensin system (RAS) inhibitors might restrain the structural/electrical remodeling associated with atrial fibrillation (AF). Limited evidence exists regarding the potential benefits of RAS inhibition post-acute myocardial infarction (AMI) in patients with AF. This study sought to assess the association between RAS inhibition and all-cause mortality and new-onset AF in patients with/without congestive heart failure (CHF) post-AMI. METHODS AND RESULTS: Patients hospitalized for AMI between 2006 and 2012 were identified in Swedish registries...
March 20, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28275069/atrial-arrhythmias-and-electroanatomical-remodeling-in-patients-with-left-ventricular-assist-devices
#18
Amrish Deshmukh, Gene Kim, Martin Burke, Emeka Anyanwu, Valluvan Jeevanandam, Nir Uriel, Roderick Tung, Cevher Ozcan
BACKGROUND: The incidence, predictors, and impact of atrial arrhythmias along with left atrial structural changes in patients with left ventricular assist devices (LVADs) remain undetermined. METHODS AND RESULTS: All patients who underwent LVAD implantation from 2008 to 2015 at the University of Chicago Medical Center were included. Electronic medical records, electrocardiograms, echocardiograms, and cardiac electrical device interrogations were reviewed. The association of arrhythmias and clinical covariates with survival was evaluated by Kaplan-Meier and Cox proportional hazards analyses...
March 8, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28268377/combined-reconstruction-of-atrial-morphology-and-paracardial-fat-depositions-to-study-remodeling-in-atrial-fibrillation
#19
N Popovic, P Haemers, R Willems, P Claus
Atrial fibrillation (AF) is the most frequent sustained cardiac arrhythmia. AF is shown to be a progressive disease, which is strongly associated with important structural (morphological and histological), electrical and mechanical remodeling of the left atrium (LA). Adipose tissue accumulation has been shown to be a risk factor in AF. We set out to explore the connection between adipose tissue coverage of the LA surface, for both the complete LA and specific regions and the progression of AF. In this study we propose a methodology to study the regional coverage of the left-atrial wall with adipose tissue based on magnetic resonance data...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28239561/regulation-of-cardiac-cacnb2-by-microrna-499-potential-role-in-atrial-fibrillation
#20
Tian-You Ling, Xiao-Li Wang, Qiang Chai, Tong Lu, John M Stulak, Lyle D Joyce, Richard C Daly, Kevin L Greason, Li-Qun Wu, Win-Kuang Shen, Yong-Mei Cha, Hon-Chi Lee
The L-type calcium channel (LTCC) is one of the major ion channels that are known to be associated with the electrical remodeling of atrial fibrillation (AF). In AF, there is significant downregulation of the LTCC, but the underlying mechanism for such downregulation is not clear. We have previously reported that microRNA-499 (miR-499) is significantly upregulated in patients with permanent AF and that KCNN3, the gene that encodes the small-conductance calcium-activated potassium channel 3 (SK3), is a target of miR-499...
June 2017: BBA Clinical
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