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Ventricular tachycardia localization

L Y Qian, H Zou, X D Che, L H Wang, X X Cen, Q Xu, B M Qu
Objective: To compare the therapeutic efficiency and safety of radiofrequency catheter ablation (RFCA) for paroxysmal ventricular tachycardia (PSVT) guided by three-dimensional navigation with X-ray. Methods: One hundred and seventy-six patients with PSVT hospitalized in Department of Cardiology, Zhejiang Provincial People's Hospital between January 2013 and December 2014 were enrolled in this study. RFCA was performed on 95 patients (Group A) guided by the three dimensional electric-field navigation system (NavX) and the procedures were done with the spatial localization method, unless X-ray was needed in some cases...
September 20, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
Konstantin V Zavadovsky, Victor V Saushkin, Mikhail S Khlynin, Sergey V Popov, Yuri B Lishmanov
BACKGROUND: The aim of the study was to evaluate the impact of idiopathic ventricular tachycardia and premature ventricular beats on cardiac function and dyssynchrony and to elucidate relationships between data of scintigraphic and intracardiac electrophysiology studies. METHODS: The study comprised 64 patients with idiopathic ventricular arrhythmias (VA) (median age of 14 years ranging from 8 to 18 years). Control group comprised 20 patients (median age of 12 ranging from 7 to 16 years) without cardiac arrhythmias...
September 23, 2016: Pacing and Clinical Electrophysiology: PACE
Walther H W Schulze, Zhong Chen, Jatin Relan, Danila Potyagaylo, Martin W Krueger, Rashed Karim, Manav Sohal, Anoop Shetty, YingLiang Ma, Nicholas Ayache, Maxime Sermesant, Herve Delingette, Julian Bostock, Reza Razavi, Kawal S Rhode, Christopher A Rinaldi, Olaf Dössel
ECG imaging is an emerging technology for the reconstruction of cardiac electric activity from non-invasively measured body surface potential maps. In this case report, we present the first evaluation of transmurally imaged activation times against endocardially reconstructed isochrones for a case of sustained monomorphic ventricular tachycardia (VT). Computer models of the thorax and whole heart were produced from MR images. A recently published approach was applied to facilitate electrode localization in the catheter laboratory, which allows for the acquisition of body surface potential maps while performing non-contact mapping for the reconstruction of local activation times...
September 20, 2016: Medical & Biological Engineering & Computing
Sied Kebir, Zacharias Orfanos, Julia Schuld, Markus Linhart, Christian Lamberz, Peter F M van der Ven, Jan Schrickel, Gregor Kirfel, Dieter O Fürst, Rainer Meyer
Pressure overload induces cardiac remodeling involving both the contractile machinery and intercalated disks (IDs). Filamin C (FlnC) and Xin actin-binding repeat-containing proteins (XIRPs) are multi-adapters localizing in IDs of higher vertebrates. Knockout of the gene encoding Xin (Xirp1) in mice leads to a mild cardiac phenotype with ID mislocalization. In order to amplify this phenotype, we performed transverse aortic constriction (TAC) on control and Xirp1-deficient mice. TAC induced similar left ventricular hypertrophy in both genotypes, suggesting that the lack of Xin does not lead to higher susceptibility to cardiac overload...
October 15, 2016: Experimental Cell Research
Ying Zhou, Elyse E Lower, Hui-Ping Li, Alexandru Costea, Mehran Attari, Robert P Baughman
OBJECTIVE: To assess the clinical characteristics, diagnosis, and outcome of cardiac sarcoidosis in a single institution sarcoidosis clinic. METHODS: Patients with cardiac sarcoidosis were identified using refined WASOG criteria of highly probable and probable. Patient demographics, local and systemic treatments and clinical outcome were collected. RESULTS: Of the 1815 patients evaluated over a six year period, 73 patients met the WASOG criteria for cardiac sarcoidosis...
September 8, 2016: Chest
Michael Barkagan, Yoav Michowitz, Aharon Glick, Oholi Tovia-Brodie, Raphael Rosso, Bernard Belhassen
BACKGROUND: A few series of focal atrial tachycardia (AT) originating from the noncoronary sinus of Valsalva (NCSV) have been reported in the literature during the last decade. METHODS AND RESULTS: Of 147 patients with AT referred for radiofrequency ablation (RFA), we identified nine (6%) originating in the vicinity of the NCSV. Clinical AT was induced during electrophysiological study in all patients without (n = 6) and with (n = 3) isoproterenol infusion. Mean cycle length of the induced tachycardia was 399 ± 85 ms...
August 24, 2016: Pacing and Clinical Electrophysiology: PACE
Koichi Nagashima, Ichiro Watanabe, Yasuo Okumura, Yoshiaki Kaneko, Kazumasa Sonoda, Rikitake Kogawa, Naoko Sasaki, Kazuki Iso, Keiko Takahashi, Sayaka Kurokawa, Toshiko Nakai, Kimie Ohkubo, Atsushi Hirayama
BACKGROUND: Although a ventriculoatrial interval (VAI) of ≤70 ms is used to distinguish atrioventricular nodal reentrant tachycardia from orthodromic atrioventricular reciprocating tachycardia (AVRT), a VAI of ≤70 ms is sometimes observed in cases of AVRT. The study aimed to evaluate the short VAI that is seen in AVRT and to understand its underlying mechanism. METHODS: Electrophysiologic studies of 46 consecutive patients with AVRT involving an accessory pathway (AP) were examined retrospectively...
October 2016: Pacing and Clinical Electrophysiology: PACE
Linda M Eerikäinen, Joaquin Vanschoren, Michael J Rooijakkers, Rik Vullings, Ronald M Aarts
In this paper, we propose an algorithm that classifies whether a generated cardiac arrhythmia alarm is true or false. The large number of false alarms in intensive care is a severe issue. The noise peaks caused by alarms can be high and in a noisy environment nurses can experience stress and fatigue. In addition, patient safety is compromised because reaction time of the caregivers to true alarms is reduced. The data for the algorithm development consisted of records of electrocardiogram (ECG), arterial blood pressure, and photoplethysmogram signals in which an alarm for either asystole, extreme bradycardia, extreme tachycardia, ventricular fibrillation or flutter, or ventricular tachycardia occurs...
August 2016: Physiological Measurement
Pei Zhang, Roderick Tung, Zuwen Zhang, Xia Sheng, Qiang Liu, Ruhong Jiang, Yaxun Sun, Shiquan Chen, Lu Yu, Yang Ye, Guosheng Fu, Kalyanam Shivkumar, Chenyang Jiang
BACKGROUND: Catheter ablation in the right ventricular outflow tract (RVOT) may modify the electrophysiologic substrate for recurrent ventricular tachycardia/ventricular fibrillation (VT/VF) in patients with Brugada syndrome (BrS). OBJECTIVE: The purpose of this study was to investigate the mechanism and arrhythmogenic substrate of VT/VF and to evaluate the long-term outcomes of catheter ablation in patients with BrS. METHODS: Eleven consecutive patients with BrS referred to 2 academic medical centers underwent combined epicardial-endocardial electroanatomic mapping...
July 22, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Seigo Yamashita, Hubert Cochet, Frédéric Sacher, Saagar Mahida, Benjamin Berte, Darren Hooks, Jean-Marc Sellal, Nora Al Jefairi, Antonio Frontera, Yuki Komatsu, Han S Lim, Sana Amraoui, Arnaud Denis, Nicolas Derval, Maxime Sermesant, François Laurent, Mélèze Hocini, Michel Haïssaguerre, Michel Montaudon, Pierre Jaïs
BACKGROUND: During the past years, many innovations have been introduced to facilitate catheter ablation of post-myocardial infarction ventricular tachycardia. However, the predictors of outcome after ablation were not thoroughly studied. METHODS AND RESULTS: From 2009 to 2013, consecutive patients referred for post-myocardial infarction ventricular tachycardia ablation were included. The end point of the procedure was complete elimination of local abnormal ventricular activities (LAVA) and ventricular tachycardia (VT) noninducibility...
July 2016: Circulation. Arrhythmia and Electrophysiology
Alessandro Zorzi, Martina Perazzolo Marra, Ilaria Rigato, Manuel De Lazzari, Angela Susana, Alice Niero, Kalliopi Pilichou, Federico Migliore, Stefania Rizzo, Benedetta Giorgi, Giorgio De Conti, Patrizio Sarto, Luis Serratosa, Giampiero Patrizi, Elia De Maria, Antonio Pelliccia, Cristina Basso, Maurizio Schiavon, Barbara Bauce, Sabino Iliceto, Gaetano Thiene, Domenico Corrado
BACKGROUND: The clinical profile and arrhythmic outcome of competitive athletes with isolated nonischemic left ventricular (LV) scar as evidenced by contrast-enhanced cardiac magnetic resonance remain to be elucidated. METHODS AND RESULTS: We compared 35 athletes (80% men, age: 14-48 years) with ventricular arrhythmias and isolated LV subepicardial/midmyocardial late gadolinium enhancement (LGE) on contrast-enhanced cardiac magnetic resonance (group A) with 38 athletes with ventricular arrhythmias and no LGE (group B) and 40 healthy control athletes (group C)...
July 2016: Circulation. Arrhythmia and Electrophysiology
Akira Ueoka, Hiroshi Morita, Atsuyuki Watanabe, Koji Nakagawa, Nobuhiro Nishii, Satoshi Nagase, Tohru Ohe, Hiroshi Ito
BACKGROUND: Clinical and experimental studies have shown the existence of an arrhythmogenic substrate in the right ventricular outflow tract (RVOT) in patients with Brugada syndrome (BrS). To evaluate the importance of the RVOT, we evaluated the activation pattern of induced ventricular tachyarrhythmias using body surface mapping (BSM) in patients with BrS. METHODS AND RESULTS: We examined 14 patients with BrS in whom ventricular tachyarrhythmias were induced by programmed electrical stimulation...
July 25, 2016: Circulation Journal: Official Journal of the Japanese Circulation Society
Vishal Luther, Nick W F Linton, Shahnaz Jamil-Copley, Michael Koa-Wing, Phang Boon Lim, Norman Qureshi, Fu Siong Ng, Sajad Hayat, Zachary Whinnett, D Wyn Davies, Nicholas S Peters, Prapa Kanagaratnam
BACKGROUND: Post-infarct ventricular tachycardia is associated with channels of surviving myocardium within scar characterized by fractionated and low-amplitude signals usually occurring late during sinus rhythm. Conventional automated algorithms for 3-dimensional electro-anatomic mapping cannot differentiate the delayed local signal of conduction within the scar from the initial far-field signal generated by surrounding healthy tissue. Ripple mapping displays every deflection of an electrogram, thereby providing fully informative activation sequences...
June 2016: Circulation. Arrhythmia and Electrophysiology
Roland Tilz, Serge Boveda, Jean-Claude Deharo, Dan Dobreanu, Kristina H Haugaa, Nikolaos Dagres
The aim of this EP Wire was to assess the management, indications, and techniques for implantable cardioverter defibrillator (ICD) and cardiac resynchronization therapy (CRT) device replacement in Europe. A total of 24 centres in 14 European countries completed the questionnaire. All centres were members of the European Heart Rhythm Association Electrophysiology Research Network. Replacement procedures were performed by electrophysiologists in 52% of the centres, by cardiologists in 33%, and both in the remaining centres...
June 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Luisa Muraro, Laura Longo, Federico Geraldini, Andrea Bortot, Andrea Paoli, Annalisa Boscolo
Caffeine is arguably the most widely used stimulant drug in the world. Here we describe a suicide attempt involving caffeine overdose whereby the patient's severe intoxication was successfully treated with the prompt infusion of Intralipid. A 19-year-old man was found in an agitated state at home by the volunteer emergency team about 1 h after the intentional ingestion of 40 g of caffeine (tablets). His consciousness decreased rapidly, followed quickly by seizures, and electrocardiographic monitoring showed ventricular fibrillation...
October 2016: Journal of Anesthesia
Celal Akdeniz, Enes Elvin Gul, Nida Celik, Mehmet Karacan, Volkan Tuzcu
INTRODUCTION: Definitive therapy of idiopathic right ventricular arrhythmias (VA) remains a challenge in interventional electrophysiology. The aim of this study was to evaluate the utility of EnSite Velocity system in the catheter ablation of RV tachycardia in children. METHODS: Thirty-five children with idiopathic right VA underwent catheter ablation procedure using the EnSite Velocity system guidance. RESULTS: The mean patient age was 12...
September 2016: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
Haifeng Pei, Qiujun Yu, Xiaohua Su, Zhen Wang, Heng Zhao, Dachun Yang, Yongjian Yang, De Li
Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a crucial health problem. With sudden death often being the first presentation, early diagnosis for ARVC is essential. Up to date, electrocardiogram (ECG) is a widely used diagnostic method without invasive harms. To diagnose and treat ARVC as well as possible, we should clearly elucidate its pathophysiological alterations. A 66-year-old farmer presented to the Emergency Department with continuous palpitation, chest tightness, profuse sweating, and nausea with no obvious predisposing causes...
April 2016: Medicine (Baltimore)
David Soto-Iglesias, Constantine Butakoff, David Andreu, Juan Fernández-Armenta, Antonio Berruezo, Oscar Camara
Integration of electrical and structural information for scar characterization in the left ventricle (LV) is a crucial step to better guide radio-frequency ablation therapies, which are usually performed in complex ventricular tachycardia (VT) cases. This integration requires finding a common representation where to map the electrical information from the electro-anatomical map (EAM) surfaces and tissue viability information from delay-enhancement magnetic resonance images (DE-MRI). However, the development of a consistent integration method is still an open problem due to the lack of a proper evaluation framework to assess its accuracy...
August 2016: Medical Image Analysis
Santiago Rivera, Maria de la Paz Ricapito, Leandro Tomas, Josefina Parodi, Guillermo Bardera Molina, Rodrigo Banega, Pablo Bueti, Agustin Orosco, Marcelo Reinoso, Milagros Caro, Diego Belardi, Gaston Albina, Alberto Giniger, Fernando Scazzuso
BACKGROUND: Catheter radiofrequency ablation of ventricular arrhythmias (VAs) arising from the left ventricle's papillary muscles has been associated with inconsistent results. The use of cryoenergy versus radiofrequency has not been compared yet. This study compares outcomes and complications of catheter ablation of VA from the papillary muscles of the left ventricle with either cryoenergy or radiofrequency. METHODS AND RESULTS: Twenty-one patients (40±12 years old; 47% males; median ejection fraction 59±7...
April 2016: Circulation. Arrhythmia and Electrophysiology
Diogo Alpuim Costa, Pedro Barata, Emanuel Gouveia, Manuela Mafra
Primary intracranial myxofibrosarcoma is exceedingly rare, with less than 10 cases published. We present a case of a 23-year-old man with previous history of a primary low grade myxofibrosarcoma of the left parietal-occipital convexity resected in March 1999. He subsequently underwent several interventions for multiple local recurrent disease until March 2004. At that time, complete remission was documented. About 8 years later, in February 2012, the patient was admitted to the emergency room with refractory acute pulmonary oedema...
2016: BMJ Case Reports
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