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Ventricular tachycardia localization

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https://www.readbyqxmd.com/read/28534205/outflow-tract-ventricular-arrhythmias-electrocardiographic-features-in-relation-to-mapping-and-ablation
#1
REVIEW
Deepak Padmanabhan, Alan Sugrue, Prakriti Gaba, Samuel J Asirvatham
Ventricular arrhythmia arising from the outflow tracts can manifest itself as frequent premature ventricular complexes (PVCs), salvos of ventricular tachycardia (VT), and/or sustained VT. It is amenable to management with medication and catheter ablation without need for an intracardiac defibrillator. The electrocardiogram (ECG) is a crucial tool in the management of these patients as it is can help localize the site of origin, thereby helping guide the electrophysiologist. An appreciation of the unique anatomy of the outflow tracts as well as their relationships with the surrounding structures is essential in interpreting the ECG...
May 22, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28506576/-clinical-characteristics-and-follow-up-of-patients-with-magnetic-resonance-imaging-confirmed-myopericarditis-a-retrospective-study
#2
Q de Hemptinne, F Picard, V Spagnoli, M Renard
INTRODUCTION: Pericarditis are frequently associated with some degree of concomitant myocardial involvement. Predominant pericarditis with limited myocardial involvement are named myopericarditis. Data regarding myopericarditis are scarce. PATIENTS AND METHODS: Retrospective chart review of all patients admitted between 2002 and 2011 with magnetic resonance imaging confirmed myopericarditis. RESULTS: Twenty-seven patients were included. Eighty-one percent were men, with median age of 32 years...
May 12, 2017: Annales de Cardiologie et D'angéiologie
https://www.readbyqxmd.com/read/28500178/electrical-substrate-elimination-in-135-consecutive-patients-with-brugada-syndrome
#3
Carlo Pappone, Josep Brugada, Gabriele Vicedomini, Giuseppe Ciconte, Francesco Manguso, Massimo Saviano, Raffaele Vitale, Amarild Cuko, Luigi Giannelli, Zarko Calovic, Manuel Conti, Paolo Pozzi, Andrea Natalizia, Simonetta Crisà, Valeria Borrelli, Ramon Brugada, Georgia Sarquella-Brugada, Marco Guazzi, Alessandro Frigiola, Lorenzo Menicanti, Vincenzo Santinelli
BACKGROUND: There is emerging evidence that localization and elimination of abnormal electric activity in the epicardial right ventricular outflow tract may be beneficial in patients with Brugada syndrome. METHODS AND RESULTS: A total of 135 symptomatic Brugada syndrome patients having implantable cardiac defibrillator were enrolled: 63 (group 1) having documented ventricular tachycardia (VT)/ventricular fibrillation (VF) and Brugada syndrome-related symptoms, and 72 (group 2) having inducible VT/VF without ECG documentation at the time of symptoms...
May 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28484842/conventional-mapping-and-ablation-of-focal-ventricular-tachycardias-in-the-healthy-heart
#4
REVIEW
Sonia Busch, Johannes Brachmann, Ahmed Saleh, Mathias Forkmann
Ventricular tachycardias (VT) in the healthy heart, also known as idiopathic VTs, often have a focal origin. Triggered activity due to delayed after-depolarization is the most likely mechanism of focal VTs. Localization of the site of origin of focal VTs is based on activation mapping with or without combination with pace mapping. The characteristic anatomic site of origin of idiopathic VTs is the right and left outflow tract. Other sites include the tricuspid and mitral annulus, the papillary muscles, and Purkinje fibers...
May 8, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28395022/optogenetic-manipulation-of-anatomical-re-entry-by-light-guided-generation-of-a-reversible-local-conduction-block
#5
Masaya Watanabe, Iolanda Feola, Rupamanjari Majumder, Wanchana Jangsangthong, Alexander S Teplenin, Dirk L Ypey, Martin J Schalij, Katja Zeppenfeld, Antoine A F de Vries, Daniël A Pijnappels
Aims: Anatomical re-entry is an important mechanism of ventricular tachycardia, characterized by circular electrical propagation in a fixed pathway. It's current investigative and therapeutic approaches are non-biological, rather unspecific (drugs), traumatizing (electrical shocks), or irreversible (ablation). Optogenetics is a new biological technique that allows reversible modulation of electrical function with unmatched spatiotemporal precision using light-gated ion channels. We therefore investigated optogenetic manipulation of anatomical re-entry in ventricular cardiac tissue...
March 1, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28371771/ecg-based-classification-of-resuscitation-cardiac-rhythms-for-retrospective-data-analysis
#6
Ali Bahrami Rad, Trygve Eftestol, Kjersti Engan, Unai Irusta, Jan Terje Kvaloy, Jo Kramer-Johansen, Lars Wik, Aggelos K Katsaggelos
There is a need to monitor the heart rhythm in resuscitation to improve treatment quality. Resuscitation rhythms are categorized into: ventricular tachycardia (VT), ventricular fibrillation (VF), pulseless electrical activity (PEA), asystole (AS), and pulse-generating rhythm (PR). Manual annotation of rhythms is time-consuming and infeasible for large datasets. Our objective was to develop ECG-based algorithms for the retrospective and automatic classification of resuscitation cardiac rhythms. METHODS: The dataset consisted of 1631 3- second ECG segments with clinical rhythm annotations, obtained from 298 out-of-hospital cardiac arrest patients...
March 30, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28324925/non-invasive-imaging-of-ventricular-activation-during-pacing-and-arrhythmia-methods-and-validation
#7
Long Yu, Steven Pogwizd, Bin He
Cardiovascular disease continued to be a leading killer world widely. Each year, about 400,000 cases of sudden cardiac arrest are reported in the U.S. alone. Clinically, radio-frequency ablative procedure has become widely applied in the treatment of ventricular arrhythmia. Non-invasive approaches have been demonstrated to be able to provide important information on the arrhythmogenesis and potentially assist in the clinical practice. In this work, we develop and validate a novel temporal sparse based imaging method, Cardiac Electrical Sparse Imaging (CESI)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28282453/the-use-of-a-novel-signal-analysis-to-identify-the-origin-of-idiopathic-right-ventricular-outflow-tract-ventricular-tachycardia-during-sinus-rhythm-simultaneous-amplitude-frequency-electrogram-transformation-mapping
#8
Abigail Louise D Te, Satoshi Higa, Fa-Po Chung, Chin-Yu Lin, Men-Tzung Lo, Che-An Liu, Chen Lin, Yi-Chung Chang, Shih-Lin Chang, Li-Wei Lo, Yu-Feng Hu, Ta-Chuan Tuan, Tze-Fan Chao, Jonan Liao, Yao-Ting Chang, Chung-Hsing Lin, Yuan Hung, Shinya Yamada, Kuo-Li Pan, Yenn-Jiang Lin, Shih-Ann Chen
INTRODUCTION: The signal characteristics of intracardiac bipolar electrograms at the origin of idiopathic RVOT-VT during sinus rhythm remain unclear. OBJECTIVE: The study sought to develop a novel real-time/online technique, simultaneous amplitude frequency electrogram transformation (SAFE-T), to quantify and localize the diseased ventricular substrate in idiopathic RVOT-VT. METHODS: We retrospectively investigated the intracardiac bipolar recordings in 70 consecutive patients (26% male, mean age 42±12 years) who underwent successful radiofrequency catheter ablation of idiopathic RVOT-VT...
2017: PloS One
https://www.readbyqxmd.com/read/28236155/cardiac-magnetic-resonance-imaging-and-electroanatomic-voltage-discordance-in-non-ischemic-left-ventricle-ventricular-tachycardia-and-premature-ventricular-depolarizations
#9
Brian P Betensky, Wei Dong, Benjamin A D'Souza, Erica S Zado, Yuchi Han, Francis E Marchlinski
PURPOSE: Magnetic resonance imaging (MRI) with late gadolinium enhancement is commonly performed in patients with non-ischemic LV ventricular tachycardia/ventricular premature depolarizations (non-ischemic LV-VT/VPDs) to define VT substrate prior to catheter ablation. We investigated the prevalence of abnormal voltage and VT localized to areas of the myocardium not reported to have late gadolinium enhancement (LGE) on routine pre-procedural MRI and sought to determine if quantitative MRI analysis could reduce this discordance...
June 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28226451/non-invasive-imaging-of-ventricular-activation-during-pacing-and-arrhythmia-methods-and-validation
#10
Long Yu, Steven Pogwizd, Bin He, Long Yu, Steven Pogwizd, Bin He, Bin He, Steven Pogwizd, Long Yu
Cardiovascular disease continued to be a leading killer world widely. Each year, about 400,000 cases of sudden cardiac arrest are reported in the U.S. alone. Clinically, radio-frequency ablative procedure has become widely applied in the treatment of ventricular arrhythmia. Non-invasive approaches have been demonstrated to be able to provide important information on the arrhythmogenesis and potentially assist in the clinical practice. In this work, we develop and validate a novel temporal sparse based imaging method, Cardiac Electrical Sparse Imaging (CESI)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28167088/substrate-ablation-of-ventricular-tachycardia-late-potentials-scar-dechanneling-local-abnormal-ventricular-activities-core-isolation-and-homogenization
#11
REVIEW
David F Briceño, Jorge Romero, Carola Gianni, Sanghamitra Mohanty, Pedro A Villablanca, Andrea Natale, Luigi Di Biase
Ventricular arrhythmias are a frequent cause of mortality in patients with ischemic cardiomyopathy and nonischemic cardiomyopathy. Scar-related reentry represents the most common arrhythmia substrate in patients with recurrent episodes of sustained ventricular tachycardia (VT). Initial mapping of scar-related VT circuits is focused on identifying arrhythmogenic tissue. The substrate-based strategies include targeting late potentials, scar dechanneling, local abnormal ventricular activities, core isolation, and homogenization of the scar...
March 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28167087/pace-mapping-to-localize-the-critical-isthmus-of-ventricular-tachycardia
#12
REVIEW
Christian de Chillou, Jean-Marc Sellal, Isabelle Magnin-Poull
Most postinfarct ventricular tachycardias (VT) are sustained by a reentrant mechanism. The "protected isthmus" of the reentrant circuit is critical for the maintenance of VTs and the target for catheter ablation. In this article, the authors describe the technique of pace-mapping during sinus rhythm to unmask postinfarct VT isthmuses. A pace-mapping map should be considered as the surrogate of an activation map during VT, in both patients with a normal heart and patients with a structural heart disease. Pace mapping is useful to unmask VT isthmuses in patients with postinfarct reentrant VTs...
March 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28167084/ventricular-tachycardia-in-ischemic-heart-disease
#13
REVIEW
Ronald Lo, Karin K M Chia, Henry H Hsia
Ventricular arrhythmias are a significant cause of morbidity and mortality in patients with ischemic structural heart disease. Endocardial and epicardial mapping strategies include scar characterization channel identification, and recording and ablation of late potentials and local abnormal ventricular activities. Catheter ablation along with new technology and techniques of bipolar ablation, needle catheter, and autonomic modulation may increase efficacy in difficult to ablate ventricular arrhythmias. Catheter ablation of ventricular arrhythmias seem to confer mortality and morbidity benefits in patients with ischemic heart disease...
March 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28167077/electrocardiographic-localization-of-ventricular-tachycardia-in-patients-with-structural-heart-disease
#14
REVIEW
John M Miller, Rahul Jain, Gopi Dandamudi, Thomas R Kambur
The 12-lead electrocardiogram (ECG) during ventricular tachycardia (VT) in patients with structural heart disease contains information that helps to narrow the electrophysiologist's search for target sites for ablation. Although replacement of myocardium by scar might be expected to produce variability in the spread of activation during VT, nonetheless reasonably consistent ECG patterns exist that can regionalize exit sites from VT circuits in up to 75% of cases. Most experience with this comes from patients with prior myocardial infarction, but a growing body of data exists concerning patients with nonischemic cardiomyopathies...
March 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28120237/hibernating-substrate-of-ventricular-tachycardia-a-three-dimensional-metabolic-and-electro-anatomic-assessment
#15
Ayman A Hussein, Michelle Niekoop, Vasken Dilsizian, Yousra Ghzally, Mohammed Abdulghani, Ramazan Asoglu, Wengen Chen, Mark Smith, Vincent See, Stephen R Shorofsky, Timm-Michael Dickfeld
PURPOSE: Hibernating myocardium (HM) is associated with sudden cardiac death (SCD). Little is known about the electrophysiological properties of HM and the basis of its association with SCD. We aimed to electrophysiologically characterize HM in patients with ventricular tachycardia (VT). METHODS: Endocardial voltage mapping, metabolic (18)FDG-positron emission tomography (PET) and perfusion (82)Rb, (201)Tl, or (99m)Tc scans were performed in 61 ischemic heart disease patients with VT...
January 25, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28104088/myocardial-wall-thinning-predicts-transmural-substrate-in-patients-with-scar-related-ventricular-tachycardia
#16
Seigo Yamashita, Frédéric Sacher, Darren A Hooks, Benjamin Berte, Jean-Marc Sellal, Antonio Frontera, Nora Al Jefairi, Yuki Komatsu, Sana Amraoui, Arnaud Denis, Nicolas Derval, Maxime Sermesant, François Laurent, Michel Montaudon, Mélèze Hocini, Michel Haïssaguerre, Pierre Jaïs, Hubert Cochet
BACKGROUND: Scar-related ventricular tachycardia (VT) arises from specific substrate according to etiology. OBJECTIVE: The purpose of this study was to evaluate the relationship between wall thinning (WT) on multidetector computed tomography (MDCT) and local abnormal ventricular activity (LAVA) in patients with ischemic cardiomyopathy (ICM), postmyocarditis (PMC), and dilated cardiomyopathy (DCM). METHODS: Forty-two patients (40 male, age 58 ± 13 years, 22 ICM, 11 PMC, 9 DCM) underwent MDCT before a combined endo-/epicardial VT ablation procedure...
February 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28097671/junctional-ectopic-tachycardia-localization-and-procedural-approach-using-cryoablation
#17
Alyson R Pierick, Ian H Law, Jennifer R Muldonado, Nicholas H VON Bergen
BACKGROUND: Idiopathic junctional ectopic tachycardia (JET) may still be difficult to control with antiarrhythmic therapy. Transcatheter ablation can be challenging and may be associated with a high risk of unintended AV block. The objective of this manuscript is to report the procedural technique, the location of the successful ablation and the procedural characteristics while utilizing 3D mapping for cryoablation of JET. METHODS: A retrospective analysis was performed on all patients who had undergone cryothermal ablation for the treatment of JET at a single center...
January 18, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28064433/magnetic-vt-study-a-prospective-multicenter-post-market-randomized-controlled-trial-comparing-vt-ablation-outcomes-using-remote-magnetic-navigation-guided-substrate-mapping-and-ablation-versus-manual-approach-in-a-low-lvef-population
#18
Luigi Di Biase, Roderick Tung, Tamás Szili-Torok, J David Burkhardt, Peter Weiss, Rene Tavernier, Adam E Berman, Erik Wissner, William Spear, Xu Chen, Petr Neužil, Jan Skoda, Dhanunjaya Lakkireddy, Bruno Schwagten, Ken Lock, Andrea Natale
PURPOSE: Patients with ischemic cardiomyopathy (ICM) are prone to scar-related ventricular tachycardia (VT). The success of VT ablation depends on accurate arrhythmogenic substrate localization, followed by optimal delivery of energy provided by constant electrode-tissue contact. Current manual and remote magnetic navigation (RMN)-guided ablation strategies aim to identify a reentry circuit and to target a critical isthmus through activation and entrainment mapping during ongoing tachycardia...
January 7, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28017938/elucidation-of-hidden-slow-conduction-by-double-ventricular-extrastimuli-a-method-for-further-arrhythmic-substrate-identification-in-ventricular-tachycardia-ablation-procedures
#19
Juan Acosta, David Andreu, Diego Penela, Mario Cabrera, Alicia Carlosena, Viatcheslav Korshunov, Francesca Vassanelli, Roger Borras, Mikel Martínez, Juan Fernández-Armenta, Markus Linhart, José M Tolosana, Lluis Mont, Antonio Berruezo
AIMS: Identification of local abnormal electrograms (EGMs) during ventricular tachycardia substrate ablation (VTSA) is challenging when they are hidden within the far-field signal. This study analyses whether the response to a double ventricular extrastimulus during substrate mapping could identify slow conducting areas that are hidden during sinus rhythm. METHODS AND RESULTS: Consecutive patients (n = 37) undergoing VTSA were prospectively included. Bipolar EGMs with >3 deflections and duration <133 ms were considered as potential hidden slow conduction EGMs (HSC-EGM) if located within/surrounding the scar area...
December 25, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/27956434/precise-noninvasive-ecg-mapping-derived-localization-of-the-origin-of-an-epicardial-ventricular-tachycardia
#20
Mehdi Namdar, Mikhail Chmelevsky, Anne-Lise Hachulla, Dipen C Shah
No abstract text is available yet for this article.
December 2016: Circulation. Arrhythmia and Electrophysiology
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