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https://www.readbyqxmd.com/read/28807377/crem-transgene-mice-an-animal-model-of-atrial-fibrillation-and-thrombogenesis
#1
A Bukowska, M Felgendreher, B Scholz, C Wolke, J S Schulte, E Fehrmann, E Wardelmann, M D Seidl, U Lendeckel, K Himmler, A Gardemann, A Goette, F U Müller
BACKGROUND: The molecular pathomechanisms underlying atrial thrombogenesis are multifactorial and still require detailed investigations. Transgenic mice with cardiomyocyte-directed expression of the transcriptional repressor CREM-IbΔC-X (CREM-TG) represent an experimental model of atrial fibrillation (AF) that shows a gradual, age-dependent progression from atrial ectopy to persistent AF. Importantly, this model develops biatrial thrombi. The molecular characteristics related to the thrombogenesis in CREM-TG mice have not been studied, yet...
August 1, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28803858/in-silico-investigations-of-the-functional-impact-of-kcna5-mutations-on-atrial-mechanical-dynamics
#2
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/28791857/antiarrhythmic-properties-of-atrial-pacing
#3
REVIEW
Magdalena Kliś, Agnieszka Sławuta, Jacek Gajek
Bradycardia, atrial stretch and dilatation, autonomic nervous system disorders, and the presence of triggers such as atrial premature contractions, are factors which predispose a person to paroxysmal AF. Atrial pacing not only eliminates bradycardia but also prevents atrial premature contractions and dispersion of refractoriness, which are a substrate for atrial fibrillation. As the prolonged duration of atrial activation during pacing, especially from locations changing the physiological pattern of this activation (right atrium lateral wall, right atrium appendage), negatively influences both a mechanical and an electrical function of the atria, the atrial pacing site affects an atrial arrhythmogenesis...
March 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28790104/first-in-man-analysis-of-the-relationship-between-electrical-rotors-from-noninvasive-panoramic-mapping-and-atrial-fibrosis-from-magnetic-resonance-imaging-in-patients-with-persistent-atrial-fibrillation
#4
Christian Sohns, Christine Lemes, Andreas Metzner, Thomas Fink, Mikhail Chmelevsky, Tilman Maurer, Margarita Budanova, Vladislav Solntsev, Walther H W Schulze, Wieland Staab, Shibu Mathew, Christian Heeger, Bruno Reißmann, Eugene Kholmovski, Dietmar Kivelitz, Feifan Ouyang, Karl-Heinz Kuck
BACKGROUND: Late gadolinium enhancement (LGE) cardiovascular magnetic resonance (CMR) imaging can be used to evaluate characteristics of atrial fibrosis. The novel noninvasive epicardial and endocardial electrophysiology system (NEEES) allows for the identification of sources with rotor activity. This study describes a new technique to examine the relationship between rotors and LGE signal intensity in patients with persistent atrial fibrillation (PERS) scheduled for ablation. METHODS AND RESULTS: Ten consecutive patients underwent pulmonary vein isolation for persistent atrial fibrillation...
August 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28771512/ace-phenotyping-in-human-heart
#5
Victoria E Tikhomirova, Olga A Kost, Olga V Kryukova, Elena Z Golukhova, Naida I Bulaeva, Aigerim Z Zholbaeva, Leo A Bokeria, Joe G N Garcia, Sergei M Danilov
AIMS: Angiotensin-converting enzyme (ACE), which metabolizes many peptides and plays a key role in blood pressure regulation and vascular remodeling, is expressed as a type-1 membrane glycoprotein on the surface of different cells, including endothelial cells of the heart. We hypothesized that the local conformation and, therefore, the properties of heart ACE could differ from lung ACE due to different microenvironment in these organs. METHODS AND RESULTS: We performed ACE phenotyping (ACE levels, conformation and kinetic characteristics) in the human heart and compared it with that in the lung...
2017: PloS One
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/28761039/atrio-esophageal-fistula-a-case-series-and-literature-review
#7
Craig A Schuring, Luke J Mountjoy, Ashley B Priaulx, Robert J Schneider, Hayden L Smith, Geoffrey C Wall, Dipen Kadaria, Amik Sodhi
BACKGROUND Percutaneous catheter radiofrequency ablation (RFA) and cryoablation of the left atrium and pulmonary vein ostia have become successful therapeutic modalities in the management of atrial fibrillation. Atrio-esophageal fistula is a rare complication. Awareness of complication risk is imperative because without prompt diagnosis and urgent surgical intervention, the outcome is often fatal. We present 3 cases of atrio-esophageal fistula following percutaneous catheter radiofrequency ablation (RFA). CASE REPORT Case 1: A 72-year old white male presented 27 days after percutaneous RFA for atrial fibrillation with fever, altered mental status, and melena...
August 1, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28738160/atrial-selective-k-channel-blockers-potential-antiarrhythmic-drugs-in-atrial-fibrillation
#8
Ursula Ravens
In the wake of demographic change in Western countries atrial fibrillation has reached an epidemiological scale, yet current strategies for drug treatment of the arrhythmia lack sufficient efficacy and safety. In search of novel medications, atrial-selective drugs that specifically target atrial over other cardiac functions have been developed. In this lecture, I will address drugs acting on potassium (K+) channels that are either predominantly expressed in atria or possess electrophysiological properties distinct in atria from ventricles...
July 24, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28733070/spatial-relationship-of-sites-for-atrial-fibrillation-drivers-and-atrial-tachycardia-in-patients-with-both-arrhythmias
#9
Tina Baykaner, Junaid A B Zaman, Albert J Rogers, Rachita Navara, Mahmood AlHusseini, Ryan T Borne, Shirley Park, Paul J Wang, David E Krummen, William H Sauer, Sanjiv M Narayan
INTRODUCTION: Atrial fibrillation (AF) often converts to and from atrial tachycardia (AT), but it is undefined if these rhythms are mechanistically related in such patients. We tested the hypothesis that critical sites for AT may be related to regional AF sources in patients with both rhythms, by mapping their locations and response to ablation on transitions to and from AF. METHODS: From 219 patients undergoing spatial mapping of AF prior to ablation at 3 centers, we enrolled 26 patients in whom AF converted to AT by ablation (n=19) or spontaneously (n=7; left atrial size 42±6cm, 38% persistent AF)...
July 14, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28730651/a-comparison-of-the-electrophysiologic-and-electroanatomic-characteristics-between-the-right-and-left-atrium-in-persistent-atrial-fibrillation-is-the-right-atrium-a-window-into-the-left
#10
Sandeep Prabhu, Aleksandr Voskoboinik, Alex Ja McLellan, Kah Y Peck, Bupesh Pathik, Chrishan J Nalliah, Geoff R Wong, Sonia M Azzopardi, Geoffrey Lee, Justin Mariani, Liang-Han Ling, Andrew J Taylor, Jonathan M Kalman, Peter M Kistler
INTRODUCTION: The right atrium (RA) is readily accessible; however, it is unclear whether changes in the RA are representative of the LA. We performed detailed bi-atrial electroanatomic mapping to determine the electrophysiological relationship between the atria. METHODS AND RESULTS: Consecutive patients with persistent AF underwent bi-atrial electroanatomical mapping with a contact force catheter acquiring points with a CF > 10 g prior to ablation. Points were analyzed for tissue voltage, complex electrograms, low voltage (< 0...
July 21, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28721223/atrial-fibrillation-in-a-preterm-newborn-with-structurally-normal-heart
#11
Pier Paolo Bassareo, Andrea Raffaele Marras, Mariangela Marras, Silvia Marras, Giuseppe Mercuro
Atrial fibrillation (AF) is a really uncommon arrhythmia in newborns. Here, we report the case of a 1-day-old infant who was recovered in Neonatal Intensive Care Unit for a twin-to-twin transfusion. The appearance of an unexpected AF was registered at his continuous electrocardiographic monitoring. Both chest X-ray and echocardiographic examination revealed the anomalous insertion of the tip of a central venous catheter (CVC) into the heart ('umbilical artery → inferior vena cava → right atrium → patent foramen ovale → left atrium')...
March 2017: Oxford Medical Case Reports
https://www.readbyqxmd.com/read/28719150/can-principles-of-the-surface-potential-be-combined-with-knowledge-of-natural-products-to-reduce-atrial-rhythm-disturbances
#12
EDITORIAL
H Ni, K Narsingani, H Zhang, W R Giles
Long lasting or chronic electrophysiological abnormalities in human atria are significant contributors to morbidity during healthy aging. Although both paroxysmal (brief) and chronic atrial fibrillation (AF) were considered to be benign; the notable association between maintained AF and stroke has resulted in AF now being a target for surgical intervention (ablation) and/or drug therapy. An interesting, forward looking paper from the Elinder Group(1) in this issue of Acta Physiologica reveals novel pharmacological agents and principles that could be the basis for more effective antiarrhythmic therapies for AF...
July 18, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28678805/ablation-as-targeted-perturbation-to-rewire-communication-network-of-persistent-atrial-fibrillation
#13
Susumu Tao, Samuel F Way, Joshua Garland, Jonathan Chrispin, Luisa A Ciuffo, Muhammad A Balouch, Saman Nazarian, David D Spragg, Joseph E Marine, Ronald D Berger, Hugh Calkins, Hiroshi Ashikaga
Persistent atrial fibrillation (AF) can be viewed as disintegrated patterns of information transmission by action potential across the communication network consisting of nodes linked by functional connectivity. To test the hypothesis that ablation of persistent AF is associated with improvement in both local and global connectivity within the communication networks, we analyzed multi-electrode basket catheter electrograms of 22 consecutive patients (63.5 ± 9.7 years, 78% male) during persistent AF before and after the focal impulse and rotor modulation-guided ablation...
2017: PloS One
https://www.readbyqxmd.com/read/28666575/alternans-in-atria-mechanisms-and-clinical-relevance
#14
REVIEW
Giedrius Kanaporis, Lothar A Blatter
Atrial fibrillation is the most common sustained arrhythmia and its prevalence is rapidly rising with the aging of the population. Cardiac alternans, defined as cyclic beat-to-beat alternations in contraction force, action potential (AP) duration and intracellular Ca(2+) release at constant stimulation rate, has been associated with the development of ventricular arrhythmias. Recent clinical data also provide strong evidence that alternans plays a central role in arrhythmogenesis in atria. The aim of this article is to review the mechanisms that are responsible for repolarization alternans and contribute to the transition from spatially concordant alternans to the more arrhythmogenic spatially discordant alternans in atria...
June 7, 2017: Medicina
https://www.readbyqxmd.com/read/28665544/pioglitazone-attenuates-atrial-remodeling-and-vulnerability-to-atrial-fibrillation-in-alloxan-induced-diabetic-rabbits
#15
Changle Liu, Ruimeng Liu, Huaying Fu, Jian Li, Xinghua Wang, Lijun Cheng, Panagiotis Korantzopoulos, Gary Tse, Guangping Li, Tong Liu
BACKGROUND/AIMS: Recent evidence indicates that peroxisome proliferator-activated receptor (PPAR)-γ activators exert anti-inflammatory and anti-oxidant actions. However, the underlying mechanisms by which these agents prevent atrial remodeling in diabetes are not completely elucidated. We sought to investigate the potential effects of pioglitazone, a PPAR-γ activator, on atrial remodeling and atrial fibrillation (AF) inducibility in diabetic rabbits. METHODS: Alloxan-induced diabetic rabbits were randomly divided into three groups: diabetes only, diabetes treated with low-dose pioglitazone (4 mg/day/kg), or diabetes treated with high dose pioglitazone (8 mg/day/kg) (n = 24 for each group)...
June 30, 2017: Cardiovascular Therapeutics
https://www.readbyqxmd.com/read/28664360/factors-associated-with-antithrombotic-treatment-decisions-for-stroke-prevention-in-atrial-fibrillation-in-the-stockholm-region-after-the-introduction-of-noacs
#16
Joris Komen, Tomas Forslund, Paul Hjemdahl, Björn Wettermark
PURPOSE: The purpose of this study was to investigate the influence of patient characteristics such as age and stroke and bleeding risks on decisions for antithrombotic treatment in patients with atrial fibrillation (AF). METHODS: This was a retrospective, population-based study including AF patients initiated with either warfarin, dabigatran, rivaroxaban, apixaban, or low-dose aspirin (ASA) between March 2015 and February 2016. Multivariate models were used to calculate adjusted odds ratios (aOR) for factors associated with treatment decisions...
June 29, 2017: European Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28634079/relaxin-reduces-susceptibility-to-post-infarct-atrial-fibrillation-in-mice-due-to-anti-fibrotic-and-anti-inflammatory-properties
#17
Thomas Beiert, Vedat Tiyerili, Vincent Knappe, Verena Effelsberg, Markus Linhart, Florian Stöckigt, Sabine Klein, Robert Schierwagen, Jonel Trebicka, Georg Nickenig, Jan W Schrickel, René P Andrié
BACKGROUND: Relaxin-2 (RLX) is a peptide hormone that exerts beneficial anti-fibrotic and anti-inflammatory effects in diverse models of cardiovascular disease. The goal of this study was to determine the effects of RLX treatment on the susceptibility to atrial fibrillation (AF) after myocardial infarction (MI). METHODS: Mice with cryoinfarction of the left anterior ventricular wall were treated for two weeks with either RLX (75 μg/kg/d) or vehicle (sodium acetate) delivered via subcutaneously implanted osmotic minipumps...
August 26, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28622331/in-silico-assessment-of-genetic-variation-in-kcna5-reveals-multiple-mechanisms-of-human-atrial-arrhythmogenesis
#18
Michael A Colman, Haibo Ni, Bo Liang, Nicole Schmitt, Henggui Zhang
A recent experimental study investigating patients with lone atrial fibrillation identified six novel mutations in the KCNA5 gene. The mutants exhibited both gain- and loss-of-function of the atrial specific ultra-rapid delayed rectifier K+ current, IKur. The aim of this study is to elucidate and quantify the functional impact of these KCNA5 mutations on atrial electrical activity. A multi-scale model of the human atria was updated to incorporate detailed experimental data on IKur from both wild-type and mutants...
June 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28609477/atrial-arrhythmogenicity-of-kcnj2-mutations-in-short-qt-syndrome-insights-from-virtual-human-atria
#19
Dominic G Whittaker, Haibo Ni, Aziza El Harchi, Jules C Hancox, Henggui Zhang
Gain-of-function mutations in KCNJ2-encoded Kir2.1 channels underlie variant 3 (SQT3) of the short QT syndrome, which is associated with atrial fibrillation (AF). Using biophysically-detailed human atria computer models, this study investigated the mechanistic link between SQT3 mutations and atrial arrhythmogenesis, and potential ion channel targets for treatment of SQT3. A contemporary model of the human atrial action potential (AP) was modified to recapitulate functional changes in IK1 due to heterozygous and homozygous forms of the D172N and E299V Kir2...
June 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28596994/recurrent-post-ablation-paroxysmal-atrial-fibrillation-shares-substrates-with-persistent-atrial-fibrillation-an-11-center-study
#20
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
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