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Idiopathic ventricular fibrillation

Oruganti Sai Satish, K Sashikanth Srivastav
Till recently, ST segment elevation in the absence of conduction abnormalities or chest pain occurring particularly in young bradycardia individuals has been considered a normal variant called early repolarisation (ER). However, recent studies suggest a more worrisome picture as patients with history of idiopathic ventricular fibrillation showed increased prevalence of ER in ECG. ER is an ECG pattern characterised by elevation of the QRS-ST junction (J point) ≥ 2 mv from baseline in the inferior (II, III, aVF) or lateral (I, aVL, V4-V6) leads manifested as QRS slurring or notching...
July 2016: Journal of the Association of Physicians of India
Shohreh Honarbakhsh, Neil Srinivasan, Claire Kirkby, Eileen Firman, Liam Tobin, Malcolm Finlay, Ross J Hunter, Cliona Murphy, Martin D Lowe, Richard J Schilling, Pier D Lambiase
AIMS: Early repolarization (ER) has been linked to poorer outcomes in idiopathic ventricular fibrillation (IVF). The role of family screening in IVF is not clear. Our aim was to review predictors for poorer outcomes and evaluate the role of family screening in IVF. METHODS AND RESULTS: This was a retrospective multicentre cohort study including all patients diagnosed with IVF. Data were collected on baseline characteristics, ECG findings, and recurrence of ventricular arrhythmia (VA) during follow-up...
October 12, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Marloes Visser, Jeroen F van der Heijden, Jasper J van der Smagt, Pieter A Doevendans, Arthur A Wilde, Peter Loh, Rutger J Hassink
BACKGROUND: Idiopathic ventricular fibrillation (IVF) is a rare cause of sudden cardiac arrest. Limited data are available on the long-term outcome of IVF patients. METHODS AND RESULTS: In this retrospective cohort study, 107 consecutive patients with an initial diagnosis of IVF were analyzed (age at index event 40.4 years, 60% male). Missing diagnostic data were acquired during follow-up, including genetic testing, to exclude underlying disease. A specific diagnosis was revealed in 22 of 107 patients (21%) during a median follow-up of 10...
October 2016: Circulation. Arrhythmia and Electrophysiology
Yanushi D Wijeyeratne, Elijah R Behr
Approximately 4% of sudden cardiac deaths are unexplained [the sudden arrhythmic death syndrome (SADS)], and up to 6-10% of survivors of cardiac arrest do not have an identifiable cardiac abnormality after comprehensive clinical evaluation [idiopathic ventricular fibrillation (IVF)]. Genetic testing may be able to play a role in diagnostics and can be targeted to an underlying phenotype present in family members following clinical evaluation. Alternatively, post-mortem genetic testing (the "molecular autopsy") may diagnose the underlying cause if a clearly pathogenic rare variant is found...
August 31, 2016: Trends in Cardiovascular Medicine
Alonso Pedrote, Adolfo Fontenla, Javier García-Fernández
INTRODUCTION AND OBJECTIVES: This report presents the findings of the 2015 Spanish Catheter Ablation Registry. METHODS: For data collection, each center was allowed to choose freely between 2 systems: retrospective, requiring the completion of a standardized questionnaire, and prospective, involving reporting to a central database. RESULTS: Data were collected from 82 centers. A total of 12 863 ablation procedures were performed, for a mean of 157±119 and a median of 138 procedures per center...
September 28, 2016: Revista Española de Cardiología
Nobue Yagihara, Hiroshi Watanabe, Phil Barnett, Laetitia Duboscq-Bidot, Atack C Thomas, Ping Yang, Seiko Ohno, Kanae Hasegawa, Ryozo Kuwano, Stéphanie Chatel, Richard Redon, Jean-Jacques Schott, Vincent Probst, Tamara T Koopmann, Connie R Bezzina, Arthur A M Wilde, Yukiko Nakano, Takeshi Aiba, Yoshihiro Miyamoto, Shiro Kamakura, Dawood Darbar, Brian S Donahue, Daichi Shigemizu, Toshihiro Tanaka, Tatsuhiko Tsunoda, Masayoshi Suda, Akinori Sato, Tohru Minamino, Naoto Endo, Wataru Shimizu, Minoru Horie, Dan M Roden, Naomasa Makita
BACKGROUND: Mutations in the coding sequence of SCN5A, which encodes the cardiac Na(+) channel α subunit, have been associated with inherited susceptibility to various arrhythmias. Variable expression of SCN5A is a possible mechanism responsible for this pleiotropic effect; however, it is unknown whether variants in the promoter and regulatory regions of SCN5A also modulate the risk of arrhythmias. METHODS AND RESULTS: We resequenced the core promoter region of SCN5A and the regulatory regions of SCN5A transcription in 1298 patients with arrhythmia phenotypes (atrial fibrillation, n=444; sinus node dysfunction, n=49; conduction disease, n=133; Brugada syndrome, n=583; and idiopathic ventricular fibrillation, n=89)...
September 2016: Journal of the American Heart Association
Deniz Akdis, Corinna Brunckhorst, Firat Duru, Ardan M Saguner
This overview gives an update on the molecular mechanisms, clinical manifestations, diagnosis and therapy of arrhythmogenic cardiomyopathy (ACM). ACM is mostly hereditary and associated with mutations in genes encoding proteins of the intercalated disc. Three subtypes have been proposed: the classical right-dominant subtype generally referred to as ARVC/D, biventricular forms with early biventricular involvement and left-dominant subtypes with predominant LV involvement. Typical symptoms include palpitations, arrhythmic (pre)syncope and sudden cardiac arrest due to ventricular arrhythmias, which typically occur in athletes...
August 2016: Arrhythmia & Electrophysiology Review
Veronique M F Meijborg, Mark Potse, Chantal E Conrath, Charly N W Belterman, Jacques M T De Bakker, Ruben Coronel
BACKGROUND: J-waves in inferolateral leads are associated with a higher risk for idiopathic ventricular fibrillation. We aimed to test potential mechanisms (depolarization or repolarization dependent) responsible for inferolateral J-waves. We hypothesized that inferolateral J-waves can be caused by regional delayed activation of myocardium that is activated late during normal conditions. METHODS: Computer simulations were performed to evaluate how J-point elevation is influenced by reducing sodium current conductivity (GNa), increasing transient outward current conductivity (Gto), or cellular uncoupling in three predefined ventricular regions (lateral, anterior, or septal)...
2016: Frontiers in Physiology
Yoshihisa Naruse, Akihiko Nogami, Yasutoshi Shinoda, Yuichi Hanaki, Yasuhiro Shirai, Shinya Kowase, Kenji Kurosaki, Takeshi Machino, Kenji Kuroki, Hiro Yamasaki, Miyako Igarashi, Yukio Sekiguchi, Kazutaka Aonuma
INTRODUCTION: Recent studies showed that J waves were associated with higher incidence of ventricular tachyarrhythmia (VT/VF) in patients with idiopathic ventricular fibrillation (VF) and myocardial infarction. We sought to assess the association between J waves and VT/VF in patients with nonischemic cardiomyopathy (NICM). METHODS AND RESULTS: We retrospectively enrolled 109 patients (79 men; mean age, 60 ± 15 years) with NICM who underwent implantable cardioverter defibrillator (ICD) implantation...
October 6, 2016: Journal of Cardiovascular Electrophysiology
Mimount Bourfiss, Anneline S J M Te Riele, Thomas P Mast, Maarten J Cramer, Jeroen F VAN DER Heijden, Toon A B VAN Veen, Peter Loh, Dennis Dooijes, Richard N W Hauer, Birgitta K Velthuis
INTRODUCTION: Arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) is associated with desmosomal mutations. Although desmosomal disruption affects both ventricles and atria, little is known about atrial involvement in ARVD/C. OBJECTIVE: To describe the extent and clinical significance of structural atrial involvement and atrial arrhythmias (AA) in ARVD/C stratified by genotype. METHODS: We included 71 patients who met ARVD/C Task Force Criteria and underwent cardiac magnetic resonance (CMR) imaging and molecular genetic analysis...
October 6, 2016: Journal of Cardiovascular Electrophysiology
Takashi Higaki, Toshiyuki Chisaka, Tomozo Moritani, Masaaki Ohta, Hidemi Takata, Toshifumi Yamauchi, Youhei Yamaguchi, Kyoko Konishi, Eiichi Yamamoto, Fumihiro Ochi, Mariko Eguchi, Minenori Eguchi-Ishimae, Yoshihide Mitani, Eiichi Ishii
BACKGROUND: Recently, we have experienced a student who died of idiopathic ventricular fibrillation in a school where automated external defibrillator (AED) had been installed. The tragedy could not be prevented because the only AED in the school was installed in teachers' office situated far from the school ground where the accident took place. This occurrence prompted us to establish multiple AED system in schools. OBJECTIVE: We analyzed the effect of multiple AED system to prevent the sudden death of school aged children...
August 26, 2016: Pediatrics International: Official Journal of the Japan Pediatric Society
Nebojša Mujović, Milan Marinković, Nebojša Marković, Aleksandar Kocijančić, Vladan Kovačević, Dragan Simić, Arsen Ristić, Goran Stanković, Biljana Miličić, Svetozar Putnik, Bosiljka Vujisić-Tešić, Tatjana S Potpara
INTRODUCTION: Cardiac tamponade (CT) is a life-threatening complication of radiofrequency ablation (RFA). The course and outcome of CT in low-to-medium volume electrophysiology centers are underreported. METHODS: We analyzed the incidence, management and outcomes of CT in 1500 consecutive RFAs performed in our center during 2011-2016. RESULTS: Of 1500 RFAs performed in 1352 patients (age 55 years, interquartile range: 41-63), 569 were left-sided procedures (n = 406 with transseptal access)...
October 2016: Advances in Therapy
Chi-Wing Wong, Yu Ho Chan, Yue Hong Cheng, Cheuk Sum Lam
No abstract text is available yet for this article.
November 15, 2016: International Journal of Cardiology
Yoav Michowitz, Sami Viskin, Raphael Rosso
Exercise-induced ventricular tachycardia (VT) rarely occurs in the absence of organic heart disease. Idiopathic monomorphic VT has an excellent prognosis. The main aspect of the risk stratification process is recognizing subtle forms of organic heart disease, particularly arrhythmogenic right ventricular cardiomyopathy. Exercise-induced polymorphic VT is potentially malignant. Exercise-induced polymorphic VT has also been seen in mitral valve prolapse. Some patients with stable coronary disease, and even healthy athletes, sometimes have short bursts of polymorphic VT during exercise tests but these arrhythmias are usually not reproducible during repeated testing and have unknown long-term clinical significance...
September 2016: Cardiac Electrophysiology Clinics
Ashok J Shah, Meleze Hocini, Arnaud Denis, Nicolas Derval, Frederic Sacher, Pierre Jais, Michel Haissaguerre
Primary electrical diseases manifest with polymorphic ventricular tachycardia (PMVT) and ventricular fibrillation (VF) and along with idiopathic VF contribute to about 10% of sudden cardiac deaths (SCDs) overall. These disorders include long QT syndrome, Brugada syndrome, catecholaminergic polymorphic ventricular tachycardia, short QT syndrome, and early repolarization syndrome. This article reviews the clinical electrophysiological management of PMVT/VF in a structurally normal heart affected with these disorders...
September 2016: Cardiac Electrophysiology Clinics
Niyada Naksuk, Suraj Kapa, Samuel J Asirvatham
Papillary muscle is an endocavitary structure that can give rise to ventricular arrhythmias in a structurally normal heart. Its manifestation is generally benign. The papillary muscle's complex anatomy and the presence of intermixed Purkinje fibers can create a substrate for idiopathic ventricular fibrillation. Although differentiating ventricular arrhythmias originating from the papillary muscle and the fascicles is challenging and not always possible, the distinction may be helpful for planning ablation. The propensity for difficulty with ablation of papillary arrhythmias results in a variable success rate...
September 2016: Cardiac Electrophysiology Clinics
Weng-Chio Tam, Ming-Hsiung Hsieh, Yung-Kuo Lin, Jong-Shiuan Yeh
A 55-year-old male with underlying type 2 diabetes mellitus and hypertension presented at our emergency department with ventricular fibrillation-related cardiac arrest. Hyper-acute ST elevation myocardial infarction was the preliminary diagnosis by 12-lead electrocardiography, which simultaneously showed J point ST elevation and tall T waves. However, the echocardiography showed concentric left ventricle hypertrophy and preserved left ventricular systolic function with no regional wall motion abnormalities, and coronary angiography did not show any critical coronary artery lesion...
July 2016: Acta Cardiol Sin
Golukhova E Z, Gromova O I, Shomahov R A, Bulaeva N I, Bockeria L A
The abrupt cessation of effective cardiac function that is generally due to heart rhythm disorders can cause sudden and unexpected death at any age and is referred to as a syndrome called "sudden cardiac death" (SCD). Annually, about 400,000 cases of SCD occur in the United States alone. Less than 5% of the resuscitation techniques are effective. The prevalence of SCD in a population rises with age according to the prevalence of coronary artery disease, which is the most common cause of sudden cardiac arrest...
April 2016: Acta Naturae
Gerrit Frommeyer, Dirk G Dechering, Simon Kochhäuser, Markus Bettin, Julia Köbe, Lars Eckardt, Florian Reinke
BACKGROUNDS: The totally subcutaneous implantable defibrillator (S-ICD) has been designed as a new alternative to conventional implantable defibrillators. This system is especially attractive for young patients. However, long-term experience is not yet available. To address the question whether the S-ICD system is safe and feasible for young patients with electrical heart disease or idiopathic ventricular fibrillation (VF), the data of a standard of care prospective single center S-ICD registry were evaluated...
May 23, 2016: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
Woo Seok Lee, Gi-Byoung Nam, Sung-Hwan Kim, Jin Hee Choi, Uk Jo, Won Young Kim, Yong-Seog Oh, Kyu Nam Park, Guang-Won Seo, Ki-Hun Kim, Eun-Sun Jin, Kyoung-Suk Rhee, Laeyoung Jung, Ki-Won Hwang, Yoo Ri Kim, Chang Hee Kwon, Jun Kim, Kee-Joon Choi, You-Ho Kim
OBJECTIVE: Hypothermia can induce ECG J waves. Recent studies suggest that J waves may be associated with ventricular fibrillation (VF) in patients with structurally normal hearts. However, little is known about the ECG features, clinical significance or arrhythmogenic potentials of therapeutic hypothermia (TH)-induced J waves. METHODS: We analysed ECGs from 240 patients who underwent TH at six major university hospitals in Korea between August 2010 and December 2013...
October 1, 2016: Heart: Official Journal of the British Cardiac Society
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