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Arrhythmia

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https://www.readbyqxmd.com/read/28641242/arrhythmia-mechanism-and-scaling-effect-on-the-spectral-properties-of-electroanatomical-maps-with-manifold-harmonics
#1
Margarita Sanroman-Junquera, Inmaculada Mora-Jimenez, Arcadi Garcia-Alberola, Antonio J Caamano, Beatriz Trenor, Jose Luis Rojo-Alvarez
Spatial and temporal processing of intracardiac electrograms provides relevant information to support the arrhythmia ablation during electrophysiological studies. Current Cardiac Navigation Systems (CNS) and Electrocardiographic Imaging (ECGI) build detailed three-dimensional electroanatomical maps (EAM), which represent the spatial anatomical distribution of bioelectrical features, such as activation time or voltage. We present a principled methodology for spectral analysis of both EAM geometry and bioelectrical feature in CNS or ECGI, including their spectral representation, cut-off frequency, or spatial sampling rate (SSR)...
June 15, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28640933/could-ivabradine-be-a-new-treatment-for-the-short-qt-syndrome
#2
EDITORIAL
Jules C Hancox
The short QT syndrome (SQTS) is a rare condition involving accelerated ventricular repolarization, abbreviated rate-corrected (QTc ) QT intervals on the electrocardiogram (ECG), poor rate adaptation of the QT interval, and an increased risk of atrial and ventricular arrhythmias and of sudden cardiac death (1-3). This article is protected by copyright. All rights reserved.
June 22, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28636506/incidence-and-predictors-of-atrial-fibrillation-after-coronary-artery-bypass-surgery-detection-by-event-loop-recorder-monitoring-from-a-contemporary-multicentre-cohort
#3
Zainab Abdel-Salam, Wail Nammas
Background Atrial fibrillation (AF) is a frequent complication after cardiac surgery. We explored the incidence and predictors of post-operative AF at 30-day follow-up in an unselected multi-centre cohort of patients undergoing elective coronary artery bypass grafting (CABG) in contemporary practice. Methods and results We enrolled 740 consecutive patients scheduled for elective CABG with or without valve surgery. Cardiac rhythm was continuously monitored for 15 days after surgery by an ambulatory event loop recorder...
March 21, 2017: Acta Cardiologica
https://www.readbyqxmd.com/read/28636428/fk506-binding-proteins-12-and-12-6-fkbps-as-regulators-of-cardiac-ryanodine-receptors-insights-from-new-functional-and-structural-knowledge
#4
Luis Alberto Gonano, Peter P Jones
Ryanodine Receptors (RyRs) are intracellular Ca(2+) channels that mediate Ca(2+) flux from the sarco(endo)plasmic reticulum in many cell types. The interaction of RyRs with FK506-binding proteins (FKBPs) has been proposed as an important regulatory mechanism, where the loss of this interaction leads to channel dysfunction. In the heart, phosphorylation of RyR has been suggested to disrupt the RyR-FKBP interaction promoting altered Ca(2+) signalling, heart failure and arrhythmias. However, the functional result of FKBP interaction with RyR and how this interaction is regulated remains highly controversial...
June 21, 2017: Channels
https://www.readbyqxmd.com/read/28635905/-algorithm-for-the-management-of-patients-with-stable-coronary-artery-disease-and-high-grade-ventricular-arrhythmias
#5
Е А Ryngach, T V Treshkur, A A Tatarinova, E V Shlyakhto
The paper gives an original algorithm for the management of patients with stable coronary artery disease, preserved/moderately reduced left ventricular systolic function, and high-grade ventricular arrhythmias from the first registration of the latter to the choice of treatment policy. Great attention is paid to the assessment of a private clinical case, by determining the nature of arrhythmias, and to the involvement of autonomic regulation in the genesis of ventricular arrhythmias. The importance of topical diagnosis of ventricular arrhythmias and identification of psychological disorders is emphasized...
2017: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/28635904/-myocardial-fibrosis-current-aspects-of-the-problem
#6
V N Karetnikova, V V Kashtalap, S N Kosareva, O L Barbarash
Fibrosis is one of the main components in the progression of most cardiovascular diseases, including coronary heart disease, by causing structural changes in the myocardium and vascular wall. The quantitative and qualitative characteristics of fibrosis of the myocardium are responsible for decreasing its elastic properties, developing diastolic dysfunction, impairing myocardial contractility, developing systolic dysfunction and cardiac arrhythmias, and worsening coronary blood flow in patients with heart failure of different etiologies...
2017: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/28634694/clinical-background-including-anticoagulant-therapy-in-patients-with-atrial-fibrillation-in-a-community-based-survey-the-saitama-af-registry
#7
Yasushi Wakabayashi, Yoshitaka Sugawara, Kanna Fujita, Takekuni Hayashi, Nahoko Ikeda, Tomio Umemoto, Hiroshi Wada, Kenichi Sakakura, Hiroshi Funayama, Takeshi Mitsuhashi, Hideo Fujita, Shin-Ichi Momomura
Atrial fibrillation (AF) is one of the most common cardiac arrhythmias, and carries an increased risk of cardiogenic embolism. Oral anticoagulants (OACs) including warfarin and/or non-vitamin K antagonists can prevent the majority of these events. The Saitama AF Registry was a community-based survey of patients with AF in Saitama City, which represents an urban community in Japan. A total of 75 institutions participated in the registry and attempted to enroll consecutive patients with AF from September 2014 to August 2015...
June 20, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28634554/false-positive-transit-time-flowmetry-graft-failure-in-multivessel-coronary-spasm-following-off-pump-coronary-artery-bypass-grafting
#8
George Kassimis, George Krasopoulos
Intraoperative Transit Time Flowmetry is currently recommended to assess graft patency during coronary artery bypass grafting (CABG), especially in presence of haemodynamic instability or inability to wean the patient from cardiopulmonary bypass, new regional wall motion abnormalities, or significant ventricular arrhythmias. The VeriQ™ system is one of the currently available systems, which detects imperfections that may be corrected by graft revision. In this case report, multivessel coronary spasm (CS) post-CABG interferes with these intraoperative parameters misleading initially into false results...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28634036/the-influence-of-sex-and-age-on-ventricular-arrhythmia-in-a-population-based-registry
#9
Kimberly Styles, John Sapp, Martin Gardner, Christopher Gray, Amir Abdelwahab, Ciorsti MacIntyre, Dongsheng Gao, Mousa Al-Harbi, Steve Doucette, Chris Theriault, Ratika Parkash
BACKGROUND: Post-hoc analyses of clinical trials and population-based studies have shown no difference in mortality between men and women, but often show that men are more likely to receive appropriate ICD therapy. We utilized a population-based registry to investigate the interaction of sex and age and the occurrence of ventricular arrhythmia in an ICD population. METHODS AND RESULTS: A total of 776 consecutive patients receiving an ICD for primary or secondary prevention in a provincial ICD registry were studied...
June 13, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28633402/pitcher-perfect-arrhythmia-monitoring-at-the-munich-oktoberfest
#10
Jorge A Wong, David Conen
No abstract text is available yet for this article.
June 13, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28633348/lifelong-arrhythmic-risk-stratification-in-arrhythmogenic-right-ventricular-cardiomyopathy-distribution-of-events-and-impact-of-periodical-reassessment
#11
Chiara Cappelletto, Davide Stolfo, Antonio De Luca, Bruno Pinamonti, Giulia Barbati, Alberto Pivetta, Marco Gobbo, Francesca Brun, Marco Merlo, Gianfranco Sinagra
Aims: The arrhythmic risk stratification of arrhythmogenic right ventricular cardiomyopathy (ARVC) remains controversial. We evaluated the long-term distribution of life-threatening arrhythmic events assessing the impact of periodical risk reassessment. Methods and results: Ninety-eight ARVC patients with no previous major ventricular arrhythmias were retrospectively analysed. Patients were assessed at baseline, at 22 [inter-quartile range (IQR) 16-26], 49 (IQR 41-55) and 97 months (IQR 90-108)...
June 13, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28632743/in-silico-assessment-of-the-effects-of-quinidine-disopyramide-and-e-4031-on-short-qt-syndrome-variant-1-in-the-human-ventricles
#12
Cunjin Luo, Kuanquan Wang, Henggui Zhang
AIMS: Short QT syndrome (SQTS) is an inherited disorder associated with abnormally abbreviated QT intervals and an increased incidence of atrial and ventricular arrhythmias. SQT1 variant (linked to the rapid delayed rectifier potassium channel current, IKr) of SQTS, results from an inactivation-attenuated, gain-of-function mutation (N588K) in the KCNH2-encoded potassium channels. Pro-arrhythmogenic effects of SQT1 have been well characterized, but less is known about the possible pharmacological antiarrhythmic treatment of SQT1...
2017: PloS One
https://www.readbyqxmd.com/read/28632280/implantable-cardioverter-defibrillators-for-primary-prevention-in-patients-with-ischemic-or-nonischemic-cardiomyopathy-a-systematic-review-and-meta-analysis
#13
Michalina Kolodziejczak, Felicita Andreotti, Mariusz Kowalewski, Antonino Buffon, Marco Matteo Ciccone, Gianfranco Parati, Pietro Scicchitano, Julia M Uminska, Stefano De Servi, Kevin P Bliden, Jacek Kubica, Alessandro Bortone, Filippo Crea, Paul Gurbel, Eliano P Navarese
Background: Implantable cardioverter-defibrillators (ICDs) have a role in preventing cardiac arrest in patients at risk for life-threatening ventricular arrhythmias. Purpose: To compare ICD therapy with conventional care for the primary prevention of death of various causes in adults with ischemic or nonischemic cardiomyopathy. Data Sources: MEDLINE, Cochrane Central Register of Controlled Trials, Google Scholar, and EMBASE databases, as well as several Web sites, from 1 April 1976 through 31 March 2017...
June 27, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28631762/-safety-and-tolerability-of-oral-hypoglycemic-therapies-in-type-2-diabetes-mellitus-patients-at-high-cardiovascular-risk
#14
Giuseppe Ambrosio, Gaetano M De Ferrari, Massimo Federici, Pasquale Perrone Filardi
Oral hypoglycemic drugs for type 2 diabetes aim at preventing the metabolic effects of hyperglycemia and cardiovascular (CV) events. The evidence of the possible CV risk related to the prescription of some antidiabetic drugs prompted regulatory agencies to require safety studies. This review provides an updated analysis of CV safety profiles for antidiabetic drugs used for the treatment of patients with high CV risk.The most recent studies analyze different aspects of CV morbidity, such as ischemic events, heart failure and arrhythmia, and their interactions with hyperglycemia...
June 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28631211/current-practice-of-dutch-cardiologists-in-detecting-and-diagnosing-atrial-fibrillation-results-of-an-online-case-vignette-study
#15
N Verbiest-van Gurp, P J M van Bladel, H A M van Kesteren, P M Erkens, H E J H Stoffers
INTRODUCTION: Detection of atrial fibrillation (AF) is important given the risk of complications, such as stroke and heart failure, and the need for preventive measures. Detection is complicated because AF can be silent or paroxysmal. Describing current practice may give clues to improve AF detection. The aim of this study was to describe how cardiologists currently detect AF. METHODS: Between December 2014 and May 2015, we sent Dutch cardiologists an online questionnaire...
June 19, 2017: Netherlands Heart Journal
https://www.readbyqxmd.com/read/28630914/deregulated-ca-2-cycling-underlies-the-development-of-arrhythmia-and-heart-disease-due-to-mutant-obscurin
#16
Li-Yen R Hu, Maegen A Ackermann, Peter A Hecker, Benjamin L Prosser, Brendan King, Kelly A O'Connell, Alyssa Grogan, Logan C Meyer, Christopher E Berndsen, Nathan T Wright, W Jonathan Lederer, Aikaterini Kontrogianni-Konstantopoulos
Obscurins are cytoskeletal proteins with structural and regulatory roles encoded by OBSCN. Mutations in OBSCN are associated with the development of hypertrophic cardiomyopathy (HCM) and dilated cardiomyopathy (DCM). Specifically, the R4344Q mutation present in immunoglobulin domain 58 (Ig58) was the first to be linked with the development of HCM. To assess the effects of R4344Q in vivo, we generated the respective knock-in mouse model. Mutant obscurins are expressed and incorporated normally into sarcomeres...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630709/mark-e-josephson-a-tribute-to-his-work-on-ventricular-arrhythmias
#17
Francis Marchlinski
Dr Josephson was passionate about the study of ventricular arrhythmias and bold in his pioneering approach to their evaluation and management. Programmed right ventricular stimulation to test for antiarrhythmic drug efficacy was already pushing the risk limits for the invasive management of cardiac arrhythmias in the 1970s.
April 2017: Arrhythmia & Electrophysiology Review
https://www.readbyqxmd.com/read/28630565/efficacy-of-various-scoring-systems-for-predicting-the-28-day-survival-rate-among-patients-with-acute-exacerbation-of-chronic-obstructive-pulmonary-disease-requiring-emergency-intensive-care
#18
Zhihong Feng, Tao Wang, Ping Liu, Sipeng Chen, Han Xiao, Ning Xia, Zhiming Luo, Bing Wei, Xiuhong Nie
We aimed to investigate the efficacy of four severity-of-disease scoring systems in predicting the 28-day survival rate among patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD) requiring emergency care. Clinical data of patients with AECOPD who required emergency care were recorded over 2 years. APACHE II, SAPS II, SOFA, and MEDS scores were calculated from severity-of-disease indicators recorded at admission and compared between patients who died within 28 days of admission (death group; 46 patients) and those who did not (survival group; 336 patients)...
2017: Canadian Respiratory Journal: Journal of the Canadian Thoracic Society
https://www.readbyqxmd.com/read/28630169/patient-specific-drug-screening-using-a-human-induced-pluripotent-stem-cell-model-of-catecholaminergic-polymorphic-ventricular-tachycardia-type-2
#19
Leonid Maizels, Irit Huber, Gil Arbel, Anke J Tijsen, Amira Gepstein, Asaad Khoury, Lior Gepstein
BACKGROUND: Catecholaminergic polymorphic ventricular tachycardia type 2 (CPVT2) results from autosomal recessive CASQ2 mutations, causing abnormal Ca(2+)-handling and malignant ventricular arrhythmias. We aimed to establish a patient-specific human induced pluripotent stem cell (hiPSC) model of CPVT2 and to use the generated hiPSC-derived cardiomyocytes to gain insights into patient-specific disease mechanism and pharmacotherapy. METHODS AND RESULTS: hiPSC cardiomyocytes were derived from a CPVT2 patient (D307H-CASQ2 mutation) and from healthy controls...
June 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28629852/bioelectronic-block-of-paravertebral-sympathetic-nerves-mitigates-post-myocardial-infarction-ventricular-arrhythmias
#20
Ray W Chui, Una Buckley, Pradeep S Rajendran, Tina Vrabec, Kalyanam Shivkumar, Jeffrey L Ardell
BACKGROUND: Autonomic dysfunction contributes to induction of ventricular tachyarrhythmia (VT). OBJECTIVE: To determine the efficacy of charge-balanced direct current (CBDC), applied to the T1-T2 segment of the paravertebral sympathetic chain, on VT inducibility post-myocardial infarction (MI). METHODS: In a porcine model, CBDC was applied in acute animals (n=7) to optimize stimulation parameters for sympathetic blockade and in chronic MI animals (n=7) to evaluate the potential for VTs...
June 16, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
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