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Ventricular arrhythmias

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https://www.readbyqxmd.com/read/28635905/-algorithm-for-the-management-of-patients-with-stable-coronary-artery-disease-and-high-grade-ventricular-arrhythmias
#1
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/28634554/false-positive-transit-time-flowmetry-graft-failure-in-multivessel-coronary-spasm-following-off-pump-coronary-artery-bypass-grafting
#2
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
#3
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/28633348/lifelong-arrhythmic-risk-stratification-in-arrhythmogenic-right-ventricular-cardiomyopathy-distribution-of-events-and-impact-of-periodical-reassessment
#4
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
#5
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
#6
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/28630914/deregulated-ca-2-cycling-underlies-the-development-of-arrhythmia-and-heart-disease-due-to-mutant-obscurin
#7
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
#8
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/28630169/patient-specific-drug-screening-using-a-human-induced-pluripotent-stem-cell-model-of-catecholaminergic-polymorphic-ventricular-tachycardia-type-2
#9
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
#10
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
https://www.readbyqxmd.com/read/28627809/ivabradine-reduces-digitalis-induced-ventricular-arrhythmias
#11
Gerrit Frommeyer, Jan Weller, Christian Ellermann, Nils Bögeholz, Patrick Leitz, Dirk G Dechering, Simon Kochhäuser, Kristina Wasmer, Lars Eckardt
The I(f) channel inhibitor ivabradine is recommended for treatment of heart failure but also affects potassium currents and thereby prolongs ventricular repolarization. The aim of the present study was to examine the electrophysiological effects of ivabradine on digitalis-induced ventricular arrhythmias. Thirteen rabbit hearts were isolated and Langendorff-perfused. After obtaining baseline data, the digitalis glycoside ouabain was infused (0.2μM). Monophasic action potentials and ECG showed a significant abbreviation of QT interval (-34ms,p<0...
June 19, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28627670/intermedin-improves-cardiac-function-and-sympathetic-neural-remodeling-in-a-rat-model-of-post-myocardial-infarction-heart-failure
#12
Bin Xu, Hao Xu, Heng Cao, Xiaoxiao Liu, Chunhuan Qin, Yanzhou Zhao, Xiaolin Han, Hongli Li
Emerging evidence has suggested that intermedin (IMD), a novel member of the calcitonin gene‑related peptide (CGRP) family, has a wide range of cardioprotective effects. The present study investigated the effects of long‑term administration of IMD on cardiac function and sympathetic neural remodeling in heart failure (HF) rats, and studied potential underlying mechanism. HF was induced in rats by myocardial infarction (MI). Male Sprague Dawley rats were randomly assigned to either saline or IMD (0.6 µg/kg/h) treatment groups for 4 weeks post‑MI...
June 14, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28625400/successful-treatment-of-ventricular-fibrillation-storm-triggered-by-short-long-short-sequence-time-to-avoid-managed-ventricular-pacing
#13
Hilmi Alnsasra, Yuval Konstantino, Sergiy Bereza, Moti Haim
Sudden cardiac death (SCD) in hypertrophic cardiomyopathy (HCM) is caused by ventricular tachyarrhythmia that can be effectively treated by implantable cardioverter defibrillator (ICD) therapy. We report of a 28-year-old man with HCM and a dual chamber ICD, originally implanted for primary prevention of SCD, (programmed to AAI(R)-DDD(R); managed ventricular pacing (MVP) mode, Medtronic Inc. St Paul, MN USA). He presented with recurrent ICD shocks due to ventricular fibrillation (VF) despite antiarrhythmic therapy...
June 8, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28625016/brugada-syndrome-and-exercise-practice-current-knowledge-shortcomings-and-open-questions
#14
Giuseppe Mascia, Elena Arbelo, Jaime Hernández Ojeda, Francesco Solimene, Ramon Brugada, Josep Brugada
Since its recognition as a clinical entity in 1992, the Brugada Syndrome (BrS), a hereditary disease characterized by a typical electrocardiogram (ECG) pattern potentially predisposing to sudden cardiac death (SCD), has attracted the attention of many physicians for its circadian pattern of ventricular arrhythmias (VA), mostly occurring at rest. Exercise may potentially worsen the ECG abnormalities in BrS patients, resulting in higher peak J-point amplitudes during the vasovagal reaction of the recovery period, possibly leading to an increased risk of cardiac events...
June 18, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28624975/deleterious-acute-and-chronic-effects-of-bradycardic-right-ventricular-apex-pacing-consequences-for-arrhythmic-outcome
#15
T R G Stams, A Dunnink, W M van Everdingen, H D M Beekman, R van der Nagel, B Kok, M F A Bierhuizen, M J Cramer, M Meine, M A Vos
In the chronic complete atrioventricular (AV) block dog (CAVB) model, both bradycardia and altered ventricular activation due to the uncontrolled idioventricular rhythm contribute to ventricular remodeling and the enhanced susceptibility to Torsade de Pointes (TdP) arrhythmias. We investigated the effect of permanent bradycardic right ventricular apex (RVA) pacing on mechanical and electrical remodeling and TdP. In 23 anesthetized dogs, serial experiments were performed at sinus rhythm (SR), acutely after AV block (AAVB) and 3 weeks of remodeling CAVB at a fixed pacing rate of 60/min...
July 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28624891/frontal-placement-of-dispersive-patch-for-effective-ablation-of-arrhythmia-originating-from-the-anterior-right-ventricular-outflow-tract
#16
Piotr Futyma, Piotr Kułakowski
No abstract text is available yet for this article.
June 17, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28624712/classification-of-ecg-heartbeats-using-nonlinear-decomposition-methods-and-support-vector-machine
#17
Kandala N V P S Rajesh, Ravindra Dhuli
Classifying electrocardiogram (ECG) heartbeats for arrhythmic risk prediction is a challenging task due to minute variations in the amplitude, duration and morphology of the ECG signal. In this paper, we propose two feature extraction approaches to classify five types of heartbeats: normal, premature ventricular contraction, atrial premature contraction, left bundle branch block and right bundle branch block. In the first approach, ECG beats are decomposed into intrinsic mode functions (IMFs) using ensemble empirical mode decomposition (EEMD)...
June 15, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28623036/-arrhythmogenic-right-ventricular-cardiomyopathy-dysplasia-literature-review-and-case-report
#18
William Alejandro Camargo-Ariza, Silvia Juliana Galvis-Blanco, Tatiana Del Pilar Camacho-Enciso, Carlos Alberto Quiroz-Romero, Juan José Bermudez-Echeverry
Arrhythmogenic right ventricular cardiomyopathy/dysplasia is an inherited autosomal dominant pathology with an estimated prevalence of 1:2,500 to 1:5,000, being higher in males (3:1). It is characterized histologically by replacement of cardiomyocytes by fibro-adipose tissue, which predisposes to ventricular arrhythmias, right ventricular failure, and sudden cardiac death. The main goal of treatment is to reduce the risk of sudden death and improve the quality of life of patients. We present the case of a 23 year old woman whose clinical symptoms started with palpitations, chest pain with physical activity, syncope and headache 6 years ago during her first pregnancy...
June 13, 2017: Archivos de Cardiología de México
https://www.readbyqxmd.com/read/28622150/intraoperative-hyperkalemia-and-ventricular-arrhythmia-during-parathyroidectomy-a-case-report
#19
Daniel J Rosenkrans, Lavinia M Kolarczyk
We present a case of acute hyperkalemia and ventricular arrhythmia during parathyroidectomy in a patient with end-stage renal disease. This case highlights the under-recognized alterations in potassium homeostasis associated with parathyroidectomy and underscores the importance of preoperative optimization.
June 15, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28621884/young-athletes-with-ventricular-premature-beats-continuing-or-not-intense-training-and-competition
#20
Attilio Parisi, Eliana Tranchita, Carlo Minganti, Fabio Sperandii, Emanuele Guerra, Leonardo Calò, Paolo Borrione, Fabio Pigozzi
INTRODUCTION: Isolated ventricular premature beats (VPBs) are commonly found during pre-participation screening in athletes. Currently the debate about the role of detraining in reducing the number of VPBs is still open. This study evaluated the arrhythmic risk in a population of young competitive athletes who showed VPBs during eligibility evaluation and that did not undergo detraining but continued practicing competitive sports. METHODS: 3746 consecutive subjects underwent pre-participation screening...
June 16, 2017: Scandinavian Journal of Medicine & Science in Sports
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