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https://www.readbyqxmd.com/read/29663449/mild-hypothermia-33%C3%A2-c-increases-the-inducibility-of-atrial-fibrillation-an-in-vivo-large-animal-model-study
#1
Martin Manninger, Alessio Alogna, David Zweiker, Birgit Zirngast, Stefan Reiter, Viktoria Herbst, Heinrich Maechler, Burkert M Pieske, Frank R Heinzel, Helmut Brussee, Heiner Post, Daniel Scherr
OBJECTIVE: Application of therapeutic mild hypothermia in patients after resuscitation, often accompanied by myocardial infarction, cardiogenic shock and systemic inflammation may impact on cardiac rhythm. We therefore tested susceptibility to atrial arrhythmias during hyperthermia (HT, 40.5°C), normothermia (NT, 38.0°C) and mild hypothermia (MH, 33.0°C). METHODS: Nine healthy, anesthetized closed-chest landrace pigs were instrumented with a quadripolar stimulation catheter in the high right atrium and a decapolar catheter in the coronary sinus...
April 16, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29659148/hydrogen-sulphide-increases-pulmonary-veins-and-atrial-arrhythmogenesis-with-activation-of-protein-kinase-c
#2
Chao-Shun Chan, Yung-Kuo Lin, Yu-Hsun Kao, Yao-Chang Chen, Shih-Ann Chen, Yi-Jen Chen
Hydrogen sulphide (H2 S), one of the most common toxic air pollutants, is an important aetiology of atrial fibrillation (AF). Pulmonary veins (PVs) and left atrium (LA) are the most important AF trigger and substrate. We investigated whether H2 S may modulate the arrhythmogenesis of PVs and atria. Conventional microelectrodes and whole-cell patch clamp were performed in rabbit PV, sinoatrial node (SAN) or atrial cardiomyocytes before and after the perfusion of NaHS with or without chelerythrine (a selective PKC inhibitor), rottlerin (a specific PKC δ inhibitor) or KB-R7943 (a NCX inhibitor)...
April 16, 2018: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/29615932/synaptic-plasticity-in-cardiac-innervation-and-its-potential-role-in-atrial-fibrillation
#3
REVIEW
Jesse L Ashton, Rebecca A B Burton, Gil Bub, Bruce H Smaill, Johanna M Montgomery
Synaptic plasticity is defined as the ability of synapses to change their strength of transmission. Plasticity of synaptic connections in the brain is a major focus of neuroscience research, as it is the primary mechanism underpinning learning and memory. Beyond the brain however, plasticity in peripheral neurons is less well understood, particularly in the neurons innervating the heart. The atria receive rich innervation from the autonomic branch of the peripheral nervous system. Sympathetic neurons are clustered in stellate and cervical ganglia alongside the spinal cord and extend fibers to the heart directly innervating the myocardium...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29604419/the-role-of-nt-proanp-and-nt-probnp-in-af-patients-association-with-af-progression-phenotypes
#4
Petra Büttner, Katja Schumacher, Borislav Dinov, Samira Zeynalova, Philipp Sommer, Andreas Bollmann, Daniela Husser, Gerhard Hindricks, Jelena Kornej
BACKGROUND: Electro-anatomical remodeling in atrial fibrillation (AF) leads to disease initiation and perpetuation. While atrial natriuretic peptide (ANP) is specifically expressed in the atria and is involved in atrial remodeling, B-type natriuretic peptide (BNP) is associated with mortality and cardiovascular events in AF. OBJECTIVE: To investigate association between NT-proBNP and NT-proANP levels with three AF progression phenotypes: persistent AF, left atrial diameter (LAD) dilatation and left atrial low voltage areas (LVA)...
March 28, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29598867/role-of-stress-kinase-jnk-in-binge-alcohol-evoked-atrial-arrhythmia
#5
Jiajie Yan, Justin K Thomson, Weiwei Zhao, Xianlong Gao, Fei Huang, Biyi Chen, Qingrong Liang, Long-Sheng Song, Michael Fill, Xun Ai
BACKGROUND: Excessive binge alcohol drinking has acute cardiac arrhythmogenic effects, including promotion of atrial fibrillation (AF), which underlies "Holiday Heart Syndrome." The mechanism that couples binge alcohol abuse with AF susceptibility remains unclear. We previously reported stress-activated c-Jun N-terminal kinase (JNK) signaling contributes to AF development. This is interesting because JNK is implicated in alcohol-caused organ malfunction beyond the heart. OBJECTIVES: The purpose of this study was to detail how JNK promotes binge alcohol-evoked susceptibility to AF...
April 3, 2018: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29590738/effect-of-the-size-of-the-left-atrium-on-sustained-sinus-rhythm-in-patients-undergoing-mitral-valve-surgery-and-concomitant-bipolar-radiofrequency-ablation-for-atrial-fibrillation
#6
Harun Avdagić, Selma Sijerčić Avdagić, Melika Pirić Avdagić, Miha Antonič
Atrial fibrillation is associated with systemic embolization and complications due to anticoagulant therapy. Radiofrequency ablation has been established as an effective and safe method for the treatment of atrial fibrillation. The aim of this study was to evaluate the effect of the size of the left atrium on the outcome of surgical radiofrequency ablation. Forty patients scheduled for elective mitral valve surgery and radiofrequency ablation were enrolled in the study. Group 1 consisted of patients with a left atrium diameter ≤5 cm and group 2 of patients with left atrium diameter >5 cm...
December 2017: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29590604/tissue-specific-optical-mapping-models-of-swine-atria-informed-by-optical-coherence-tomography
#7
Theresa H Lye, Kevin P Vincent, Andrew D McCulloch, Christine P Hendon
Computational models and experimental optical mapping of cardiac electrophysiology serve as powerful tools to investigate the underlying mechanisms of arrhythmias. Modeling can also aid the interpretation of optical mapping signals, which may have different characteristics with respect to the underlying electrophysiological signals they represent. However, despite the prevalence of atrial arrhythmias such as atrial fibrillation, models of optical electrical mapping incorporating realistic structure of the atria are lacking...
March 27, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29590383/the-cox-maze-iv-procedure-in-its-second-decade-still-the-gold-standard
#8
Chawannuch Ruaengsri, Matthew R Schill, Ali J Khiabani, Richard B Schuessler, Spencer J Melby, Ralph J Damiano
Atrial fibrillation (AF) is the most common cardiac arrhythmia and the treatment options include medical treatment and catheter-based or surgical interventions. AF is a major cause of stroke, and its prevalence is increasing. The surgical treatment of AF has been revolutionized over the past 2 decades through surgical innovation and improvements in endoscopic imaging, ablation technology and surgical instrumentation. The Cox-maze (CM) procedure, which was developed by James Cox and introduced clinically in 1987, is a procedure in which multiple incisions are created in both the left and the right atria to eliminate AF while allowing the sinus impulse to reach the atrioventricular node...
April 1, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29587379/galectin-3-in-atrial-fibrillation-mechanisms-and-therapeutic-implications
#9
REVIEW
Nicolas Clementy, Eric Piver, Arnaud Bisson, Clémentine Andre, Anne Bernard, Bertrand Pierre, Laurent Fauchier, Dominique Babuty
Maintenance of atrial fibrillation is a complex mechanism, including extensive electrical and structural remodeling of the atria which involves progressive fibrogenesis. Galectin-3 is a biomarker of fibrosis, and, thus, may be involved in atrial remodeling in atrial fibrillation patients. We review the role of galectin-3 in AF mechanisms and its potential therapeutic implications.
March 25, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29579615/second-generation-cryoballoon-ablation-as-a-first-line-treatment-of-symptomatic-atrial-fibrillation-two-year-outcome-and-predictors-of-recurrence-after-a-single-procedure
#10
Ersan Akkaya, Alexander Berkowitsch, Sergej Zaltsberg, Harald Greiss, Christian W Hamm, Johannes Sperzel, Thomas Neumann, Malte Kuniss
INTRODUCTION: Antiarrhythmic drug (AAD) therapy of patients with atrial fibrillation (AF) has limitations. We investigated the 2-year outcome and pre-procedural predictors of recurrence for first-line catheter ablation using the second-generation cryoballoon (CB-Adv) in a large cohort of patients with symptomatic AF. METHODS AND RESULTS: For this prospective observational study, we enrolled 457 patients with symptomatic AF (278 paroxysmal, 179 persistent) who had no history of AAD use and who underwent pulmonary vein isolation (PVI) with the CB-Adv at our institution...
May 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29572083/atrial-fibrillation-and-prediction-of-mortality-by-conventional-clinical-score-systems-according-to-the-setting-of-care
#11
Igor Diemberger, Elisa Fantecchi, Maria Letizia Bacchi Reggiani, Cristian Martignani, Andrea Angeletti, Giulia Massaro, Matteo Ziacchi, Mauro Biffi, Gregory Y H Lip, Giuseppe Boriani
BACKGROUND: Atrial fibrillation (AF) is associated with high morbidity and mortality, also among anticoagulated patients. Our aim was to evaluate the predictive role for long-term mortality of a series of risk stratification scores associated with cardiovascular or thromboembolic outcomes (CHADS2 , CHA2 DS2 -VASc, ATRIA, TIMI-AF), and bleeding complications (HAS-BLED) in an unselected population of patients with AF. METHODS: Single center, observational, prospective registry of consecutive patients with AF, undergoing clinical/echocardiographic evaluation in a University Hospital, as either in-patients or out-patients...
March 14, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29560065/thromboprophylaxis-for-patients-with-high-risk-atrial-fibrillation-and-flutter-discharged-from-the-emergency-department
#12
David R Vinson, E Margaret Warton, Dustin G Mark, Dustin W Ballard, Mary E Reed, Uli K Chettipally, Nimmie Singh, Sean Z Bouvet, Bory Kea, Patricia C Ramos, David S Glaser, Alan S Go
Introduction: Many patients with atrial fibrillation or atrial flutter (AF/FL) who are high risk for ischemic stroke are not receiving evidence-based thromboprophylaxis. We examined anticoagulant prescribing within 30 days of receiving dysrhythmia care for non-valvular AF/FL in the emergency department (ED). Methods: This prospective study included non-anticoagulated adults at high risk for ischemic stroke (ATRIA score ≥7) who received emergency AF/FL care and were discharged home from seven community EDs between May 2011 and August 2012...
March 2018: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29553490/electrophysiological-assessment-of-murine-atria-with-high-resolution-optical-mapping
#13
Kensuke Ihara, Koji Sugiyama, Kentaro Takahashi, Masahiro Yamazoe, Tetsuo Sasano, Tetsushi Furukawa
Recent genome-wide association studies targeting atrial fibrillation (AF) have indicated a strong association between the genotype and electrophysiological phenotype in the atria. That encourages us to utilize a genetically-engineered mouse model to elucidate the mechanism of AF. However, it is difficult to evaluate the electrophysiological properties in murine atria due to their small size. This protocol describes the electrophysiological evaluation of atria using an optical mapping system with a high temporal and spatial resolution in Langendorff perfused murine hearts...
February 22, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29551001/persistence-of-an-iatrogenic-atrial-septal-defect-after-a-second-generation-cryoballoon-ablation-of-atrial-fibrillation
#14
Tomonori Watanabe, Shinsuke Miyazaki, Takatsugu Kajiyama, Sadamitsu Ichijo, Takamitsu Takagi, Miyako Igarashi, Hiroaki Nakamura, Hiroshi Taniguchi, Hitoshi Hachiya, Yoshito Iesaka
Persistent iatrogenic atrial septal defects (iASDs) can be observed after intervention requiring a left atria (LA) access, including pulmonary vein isolation (PVI) of atrial fibrillation (AF). We investigated the incidence of iASDs post-second-generation cryoballoon ablation and the pre-procedural predictors. Eighty-three paroxysmal AF patients underwent PVI using second-generation cryoballoons. The LA was accessed with single 15-Fr steerable sheaths following a radiofrequency transseptal puncture, and the iASD was evaluated with transthoracic echocardiography (TTE), a median of 9...
March 17, 2018: Heart and Vessels
https://www.readbyqxmd.com/read/29534678/cryoballoon-ablation-for-paroxysmal-atrial-fibrillation-in-a-case-of-persistent-left-superior-vena-cava
#15
Shiwei Huang, Binglin Pan, He Zou, Wei Lin
BACKGROUND: Atrial fibrillation (AF) usually originates from pulmonary veins (PVs) but can also be caused by pulmonary veins outside, such as the coronary sinus (CS), the superior vena cava (SVC), and the ligament of Marshall. CASE PRESENTATION: A 69-year-old male with a history of palpitations for 10 years was referred to our institute because of its recurrence for half a day. A dynamic electrocardiogram revealed sinus rhythm (SR) and paroxysmal AF. Echocardiography demonstrated normal cardiac structure, and physical examination results were unremarkable...
March 13, 2018: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/29505583/factors-affecting-basket-catheter-detection-of-real-and-phantom-rotors-in-the-atria-a-computational-study
#16
Laura Martinez-Mateu, Lucia Romero, Ana Ferrer-Albero, Rafael Sebastian, José F Rodríguez Matas, José Jalife, Omer Berenfeld, Javier Saiz
Anatomically based procedures to ablate atrial fibrillation (AF) are often successful in terminating paroxysmal AF. However, the ability to terminate persistent AF remains disappointing. New mechanistic approaches use multiple-electrode basket catheter mapping to localize and target AF drivers in the form of rotors but significant concerns remain about their accuracy. We aimed to evaluate how electrode-endocardium distance, far-field sources and inter-electrode distance affect the accuracy of localizing rotors...
March 5, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29494685/does-dexmedetomidine-have-an-antiarrhythmic-effect-on-cardiac-patients-a-meta-analysis-of-randomized-controlled-trials
#17
Xiaoyan Ling, Hongmei Zhou, Yunjian Ni, Cheng Wu, Caijun Zhang, Zhipeng Zhu
BACKGROUND: Cardiac surgery patients often experience several types of tachyarrhythmias after admission to the intensive care unit (ICU), which increases mortality and morbidity. Dexmedetomidine (DEX) is a popular medicine used for sedation in the ICU, and its other pharmacological characteristics are gradually being uncovered. PURPOSE: To determine whether DEX has an antiarrhythmic effect after cardiac surgery. METHODS: The three primary databases MEDLINE, Embase (OVID SP) and the Cochrane Central Register of Controlled Trials (CENTRAL) were searched, and all English-language and randomized control-designed clinical publications comparing DEX to control medicines for sedation after elective cardiac surgery were included...
2018: PloS One
https://www.readbyqxmd.com/read/29477215/influence-of-ethnic-background-on-left-atrial-markers-of-inflammation-endothelial-function-and-tissue-remodelling
#18
Carlee D Ruediger, Bobby John, Sathesh Kumar, Han S Lim, Geetanjali Rangnekar, Kurt C Roberts-Thomson, Glenn D Young, David Chase, Prashanthan Sanders, Scott R Willoughby
BACKGROUND: It has been suggested that ethnicity can make a significant difference to the likelihood of thromboembolic stroke related to atrial fibrillation. Ethnic differences have been shown to alter inflammatory and haemostatic factors; however, this may all be confounded by differences in cardiovascular risk factors between different ethnicity. The impact of different ethnicities on the thrombogenic profile is not known. The aim of this study was to investigate differences in markers of inflammation, endothelial function and tissue remodelling between Caucasian and Indian populations with supraventricular tachycardia (SVT)...
January 2018: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29452989/prognostic-role-of-cardiac-calcifications-in-primary-prevention-a-powerful-marker-of-adverse-outcome-highly-dependent-on-underlying-cardiac-rhythm
#19
Carmine Mazzone, Gianni Cioffi, Concetta Di Nora, Giulia Barbati, Federica Guidetti, Pompilio Faggiano, Nicola Gaibazzi, Giorgio Faganello, Endria Casanova Borca, Andrea Di Lenarda
BACKGROUND: Increasing evidence exists regarding calcium detected in aortic cusps and/or mitral annulus (AOC_MAC) at transthoracic echocardiogram as a predictor of cardiovascular (CV) events and mortality. PURPOSE: To verify whether AOC_MAC has a prognostic role in the setting of primary prevention independently of the presence of atrial fibrillation (AF). METHODS: All subjects consecutively referred from January 2011 to October 2014 to the Cardiovascular Centre for CV risk assessment in primary prevention were selected...
January 31, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29407081/major-bleeding-and-intracranial-hemorrhage-risk-prediction-in-patients-with-atrial-fibrillation-attention-to-modifiable-bleeding-risk-factors-or-use-of-a-bleeding-risk-stratification-score-a-nationwide-cohort-study
#20
Tze-Fan Chao, Gregory Y H Lip, Yenn-Jiang Lin, Shih-Lin Chang, Li-Wei Lo, Yu-Feng Hu, Ta-Chuan Tuan, Jo-Nan Liao, Fa-Po Chung, Tzeng-Ji Chen, Shih-Ann Chen
BACKGROUND: While modifiable bleeding risks should be addressed in all patients with atrial fibrillation (AF), use of a bleeding risk score enables clinicians to 'flag up' those at risk of bleeding for more regular patient contact reviews. We compared a risk assessment strategy for major bleeding and intracranial hemorrhage (ICH) based on modifiable bleeding risk factors (referred to as a 'MBR factors' score) against established bleeding risk stratification scores (HEMORR 2 HAGES, HAS-BLED, ATRIA, ORBIT)...
March 1, 2018: International Journal of Cardiology
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