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https://www.readbyqxmd.com/read/29081398/high-resolution-mapping-of-the-triangle-of-koch-spatial-heterogeneity-of-fast-pathway-atrionodal-connections
#1
Kelvin Chua, Gaurav Upadhyay, Elliot Lee, Zaid Aziz, Andrew Beaser, Cevher Ozcan, Michael Broman, Hemal Nayak, Roderick Tung
BACKGROUND: Prior dedicated mapping studies of the triangle of Koch to characterize retrograde fast pathway activation have not been performed using high-resolution, three-dimensional, multielectrode mapping technology. OBJECTIVE: To delineate the activation pattern and spatial distribution of the retrograde fast pathway within the triangle of Koch during typical AVNRT and right ventricular pacing in a consecutive series of patients using the Rhythmia mapping system...
October 25, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29050870/brugada-syndrome-is-associated-with-scar-and-endocardial-involvement-insights-from-high-density-mapping-with-the-rhythmia%C3%A2-mapping-system
#2
Rui Providência, Pedro Carmo, Francisco Moscoso Costa, Diogo Cavaco, Francisco Morgado, Mauricio Scanavacca, Pedro Adragão
The authors report the first catheter ablation of Brugada syndrome in the literature using the Rhythmia™ mapping system. Learning points include: (1) low voltage areas can be documented while mapping in some individuals, suggesting that Brugada syndrome may not be a pure ion channel disorder; (2) typical long fractionated potentials can also be identified in the endocardium, supporting the need to map the endocardium in all Brugada patients requiring ablation; (3) disappearance of the typical coved pattern following ablation does not necessarily predict cure, as the patient we present experienced ventricular fibrillation recurrence a few months later...
October 2017: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29021859/the-electrical-circuit-of-a-hemodynamically-unstable-and-recurrent-ventricular-tachycardia-diagnosed-in-35%C3%A2-s-with-the-rhythmia-mapping-system
#3
Masateru Takigawa, Antonio Frontera, Nathaniel Thompson, Stefano Capellino, Pierre Jais, Frederic Sacher
Herein, we report a 47-year-old woman with ischemic cardiomyopathy who underwent ablation therapy due to an electrical storm without any triggers. The voltage mapping in sinus rhythm with the Rhythmia system and Orion catheter displayed several LAVAs in and around the anteroapical scar area. Although the patient did not tolerate the induced clinical ventricular tachycardia, which was reproductively induced, 35-second-mapping in the scar zone with the Orion catheter demonstrated the VT circuit with the critical isthmus...
October 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28943481/spiral-activation-of-the-superior-vena-cava-the-utility-of-ultra-high-resolution-mapping-for-caval-isolation
#4
Seigo Yamashita, Michifumi Tokuda, Ryota Isogai, Kenichi Tokutake, Kenichi Yokoyama, Ryohsuke Narui, Mika Kato, Shinichi Tanigawa, Keiichi Inada, Seiichiro Matsuo, Satoru Miyanaga, Kenichi Sugimoto, Michihiro Yoshimura, Teiichi Yamane
BACKGROUND: Little is known about the manner in which the superior vena cava (SVC) is activated during sinus rhythm. OBJECTIVE: The purpose of this study was to assess the manner of caval activation with an ultra-high-density mapping system (Rhythmia, Boston Scientific, Marlborough, MA) and its utility for SVC isolation. METHODS: Forty patients with atrial fibrillation (mean age 55 ± 12 years; paroxysmal atrial fibrillation in 23[58%]) who underwent SVC mapping with Rhythmia were studied...
September 22, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28924118/atrial-arrhythmia-ablation-in-adult-congenital-heart-disease-with-a-persistent-left-side-superior-vena-cava
#5
Shinya Yamada, Li-Wei Lo, Yenn-Jiang Lin, Atul Prabhu, Shih-Ann Chen
We herein report a case of atrial tachycardia (AT) originating from the dilated coronary sinus (CS) connected to a persistent left superior vena cava. The earliest activation site of AT was localized at the superior CS ostium, identified using a novel ultra-rapid high-density mapping system (Rhythmia™). Successful ablation was performed at the corresponding position. This report demonstrated the utility of an ultra-rapid high-density mapping system in identifying arrhythmogenic foci in adult cases of congenital heart disease...
September 15, 2017: Internal Medicine
https://www.readbyqxmd.com/read/28833757/the-sawtooth-ekg-pattern-of-typical-atrial-flutter-is-not-related-to-slow-conduction-velocity-at-the-cavotricuspid-isthmus
#6
Arunashis Sau, Markus B Sikkel, Vishal Luther, Ian Wright, Fernando Guerrero, Michael Koa-Wing, David Lefroy, Nicholas Linton, Norman Qureshi, Zachary Whinnett, Phang Boon Lim, Prapa Kanagaratnam, Nicholas S Peters, D Wyn Davies
INTRODUCTION: We hypothesized that very high-density mapping of typical atrial flutter (AFL) would facilitate a more complete understanding of its circuit. Such very high-density mapping was performed with the Rhythmia(TM) (Boston Scientific) mapping system using its 64 electrode basket catheter. METHODS AND RESULTS: Data were acquired from 13 patients in AFL. Functional anatomy of the right atrium (RA) was readily identified during mapping including the Crista Terminalis and Eustachian ridge...
August 22, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28797676/electrogram-signature-of-specific-activation-patterns-analysis-of-atrial-tachycardias-at-high-density-endocardial-mapping
#7
Antonio Frontera, Masateru Takigawa, Ruairidh Martin, Nathaniel Thompson, Ghassen Cheniti, Grégoire Massoullié, Josselin Duchateau, Jean Yves Wielandts, Elvis Teijeira, Takeshi Kitamura, Michael Wolf, Nora Al-Jefairi, Konstantinos Vlachos, Seigo Yamashita, Sana Amraoui, Arnaud Denis, Meleze Hocini, Hubert Cochet, Frederic Sacher, Pierre Jaïs, Michel Haïssaguerre, Nicolas Derval
BACKGROUND: The significance of fractionated electrograms (EGMs) is object of debate, with multiple mechanisms described. OBJECTIVE: Using Rhythmia, a high-density mapping system, we sought to investigate the relationship between specific electrophysiological phenomena and EGM characteristics at those sites. METHODS: Twenty-five consecutive patients underwent high-density atrial mapping during atrial tachycardias. Bipolar EGMs were recorded with a 64-electrode basket catheter...
August 8, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28756424/cavotricuspid-isthmus-dependent-flutter-or-left-sided-atrial-tachycardia
#8
Kevin Ming Wei Leong, Fernando Guerrero, Phang Boon Lim
A 52-year-old man with previous mitral valve replacement, cavotricuspid isthmus, and left-sided roof-line ablation for previous typical atrial flutter and tachycardia presented with recurrence of symptoms with an atrial tachycardia measuring 260 ms cycle length on electrocardiogram. Rhythmia electroanatomical mapping (Boston Scientific) was performed to understand the mechanism of arrhythmia and to guide ablative treatment.
August 2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/28395996/atrial-fibrillation-ablation-guided-by-a-novel-nonfluoroscopic-navigation-system
#9
Gabriel Ballesteros, Pablo Ramos, Renzo Neglia, Diego Menéndez, Ignacio García-Bolao
INTRODUCTION AND OBJECTIVES: Rhythmia is a new nonfluoroscopic navigation system that is able to create high-density electroanatomic maps. The aim of this study was to describe the acute outcomes of atrial fibrillation (AF) ablation guided by this system, to analyze the volume provided by its electroanatomic map, and to describe its ability to locate pulmonary vein (PV) reconnection gaps in redo procedures. METHODS: This observational study included 62 patients who underwent AF ablation with Rhythmia compared with a retrospective cohort who underwent AF ablation with a conventional nonfluoroscopic navigation system (Ensite Velocity)...
April 5, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28356307/visualizing-localized-reentry-with-ultra-high-density-mapping-in-iatrogenic-atrial-tachycardia-beware-pseudo-reentry
#10
Vishal Luther, Markus Sikkel, Nathan Bennett, Fernando Guerrero, Kevin Leong, Norman Qureshi, Fu Siong Ng, Sajad A Hayat, S M Afzal Sohaib, Louisa Malcolme-Lawes, Elaine Lim, Ian Wright, Michael Koa-Wing, David C Lefroy, Nick W F Linton, Zachary Whinnett, Prapa Kanagaratnam, D Wyn Davies, Nicholas S Peters, Phang Boon Lim
BACKGROUND: The activation pattern of localized reentry (LR) in atrial tachycardia remains incompletely understood. We used the ultra-high density Rhythmia mapping system to study activation patterns in LR. METHODS AND RESULTS: LR was suggested by small rotatory activations (carousels) containing the full spectrum of the color-coded map. Twenty-three left-sided atrial tachycardias were mapped in 15 patients (age: 64±11 years). 16 253±9192 points were displayed per map, collected over 26±14 minutes...
April 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28054727/direct-comparison-of-point-by-point-and-rapid-ultra-high-resolution-electroanatomical-mapping-in-patients-scheduled-for-ablation-of-atrial-fibrillation
#11
Laura Rottner, Andreas Metzner, Feifan Ouyang, Christian Heeger, Kentaro Hayashi, Thomas Fink, Christine Lemes, Shibu Mathew, Tilman Maurer, Bruno REIßMANN, Enida Rexha, Johannes Riedl, Ardan M Saguner, Francesco Santoro, Karl-Heinz Kuck, Christian Sohns
INTRODUCTION: Three-dimensional electroanatomical mapping (EAM) is an established tool facilitating catheter ablation. In this context, the novel Rhythmia system sets a new bar in fast high-resolution mapping. The aim of this study was to directly compare point-by-point versus rapid ultra-high-resolution EAM in patients scheduled for ablation of atrial fibrillation (AF) with focus on procedural data, acute success, and midterm clinical outcome. METHODS AND RESULTS: A total number of 74 consecutive patients (48/74 male) with symptomatic AF were scheduled to undergo pulmonary vein isolation (PVI) using either Carto or Rhythmia...
March 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28039280/selection-of-critical-isthmus-in-scar-related-atrial-tachycardia-using-a-new-automated-ultrahigh-resolution-mapping-system
#12
Decebal Gabriel Laţcu, Sok-Sithikun Bun, Frédéric Viera, Tahar Delassi, Mohammed El Jamili, Alaa Al Amoura, Nadir Saoudi
BACKGROUND: Accurate activation mapping of reentrant scar-related atrial tachycardias (AT) allows efficient radiofrequency ablation by targeting the critical isthmus (CI). We aimed to assess the electrophysiological properties of CI channels during mapping with the IntellaMap Orion basket and the Rhythmia system. METHODS AND RESULTS: We prospectively studied 33 AT (post- atrial fibrillation ablation or surgical mitral valve repair). The noise of bipolar electrogram (EGM) was systematically measured at 10 prespecified sites, as well as on a standard catheter and on the surface ECG...
January 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/27867071/evaluation-of-a-novel-high-resolution-mapping-system-for-catheter-ablation-of-ventricular-arrhythmias
#13
Karthik Viswanathan, Lilian Mantziari, Charles Butcher, Emily Hodkinson, Eric Lim, Habib Khan, Sandeep Panikker, Shouvik Haldar, Julian W E Jarman, David G Jones, Wajid Hussain, John P Foran, Vias Markides, Tom Wong
BACKGROUND: The mapping of ventricular arrhythmias in humans using a minibasket 64-electrode catheter paired with a novel automatic mapping system (Rhythmia) has not been evaluated. OBJECTIVE: The purpose of this study was to evaluate the safety and efficacy of mapping ventricular arrhythmias and clinical outcomes after ablation using this system. METHODS: Electroanatomic maps for ventricular arrhythmias were obtained during 20 consecutive procedures in 19 patients (12 with ventricular tachycardia [VT] and 2 with ventricular ectopy [VE])...
November 17, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27853943/endocardial-voltage-mapping-of-pulmonary-veins-with-an-ultra-high-resolution-system-to-evaluate-atrial-myocardial-extensions
#14
Francesco Santoro, Christian Sohns, Ardan M Saguner, Natale Daniele Brunetti, Christine Lemes, Shibu Mathew, Christian-H Heeger, Bruno Reißmann, Tilman Maurer, Johannes Riedl, Thomas Fink, Kentaro Hayashi, Feifan Ouyang, Matteo Di Biase, Karl-Heinz Kuck, Andreas Metzner
INTRODUCTION: Atrial fibrillation (AF) is mainly triggered by arrhythmogenic foci originating from atrial myocardial extensions (MEs) into the pulmonary veins (PVs). Aim of the study was to evaluate endocardial voltage maps of PVs as a surrogate parameter for the extent of MEs in subjects with AF through a ultra-high-density mapping system. METHODS: Sixty-four bipolar electrograms were recorded simultaneously from the Orion mini-basket catheter placed in 72 PVs of 18 consecutive patients with paroxysmal/persistent AF undergoing PV isolation (PVI)...
April 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/27440005/high-resolution-mapping-of-postinfarction-reentrant-ventricular-tachycardia-electrophysiological-characterization-of-the-circuit
#15
Elad Anter, Cory M Tschabrunn, Alfred E Buxton, Mark E Josephson
BACKGROUND: In vivo description of ventricular tachycardia (VT) circuits is limited by insufficient spatiotemporal resolution. We used a novel high-resolution mapping technology to characterize the electrophysiological properties of the postinfarction reentrant VT circuit. METHODS: In 15 swine, myocardial infarction was induced by left anterior descending artery balloon occlusion. Animals were studied 6 to 8 weeks after myocardial infarction. Activation mapping of VTs was performed by using the Rhythmia mapping system...
July 26, 2016: Circulation
https://www.readbyqxmd.com/read/27289462/first-clinical-experience-using-a-novel-high-resolution-electroanatomical-mapping-system-for-left-atrial-ablation-procedures
#16
Christian Sohns, Ardan M Saguner, Christine Lemes, Francesco Santoro, Shibu Mathew, Christian Heeger, Bruno Reißmann, Tilman Maurer, Johannes Riedl, Thomas Fink, Kentaro Hayashi, Feifan Ouyang, Karl-Heinz Kuck, Andreas Metzner
BACKGROUND: The Rhythmia mapping system was recently launched and allows for rapid ultra-high-resolution electroanatomical mapping. We evaluated the feasibility, acute efficacy and safety of this novel system for ablation of atrial fibrillation (AF) and left atrial (LA) tachycardia (AT). METHODS AND RESULTS: A total of 35 consecutive patients (age 64.3 ± 8.6 years, LA diameter 44.4 ± 5.8 mm) underwent catheter ablation for AF and/or AT. All procedures were performed using Rhythmia in conjunction with the Orion mini-basket catheter...
December 2016: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/27262767/evaluation-of-a-novel-high-resolution-mapping-technology-for-ablation-of-recurrent-scar-related-atrial-tachycardias
#17
Elad Anter, Thomas H McElderry, Fernando M Contreras-Valdes, Jianqing Li, Patricia Tung, Eran Leshem, Charles I Haffajee, Hiroshi Nakagawa, Mark E Josephson
BACKGROUND: Rhythmia is a new technology capable of rapid and high-resolution mapping. However, its potential advantage over existing technologies in mapping complex scar-related atrial tachycardias (ATs) has not yet been evaluated. OBJECTIVE: The purpose of this study was to examine the utility of Rhythmia for mapping scar-related ATs in patients who had failed previous ablation procedure(s). METHODS: This multicenter study included 20 patients with recurrent ATs within 2 years after a previous ablation procedure (1...
October 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/26850748/combined-remote-magnetic-navigation-and-ultra-high-density-mapping-rhythmia%C3%A2-in-slow-pathway-ablation
#18
Decebal Gabriel Latcu, Sok-Sithikun Bun, Nadir Saoudi
No abstract text is available yet for this article.
June 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/26001505/pulmonary-vein-isolation-using-the-rhythmia-mapping-system-verification-of-intracardiac-signals-using-the-orion-mini-basket-catheter
#19
Elad Anter, Cory M Tschabrunn, Fernando M Contreras-Valdes, Jianqing Li, Mark E Josephson
BACKGROUND: During pulmonary vein isolation (PVI), a circular lasso catheter is positioned at the junction between the left atrium (LA) and the pulmonary vein (PV) to confirm PVI. The Rhythmia mapping system uses the Orion mini-basket catheter with 64 electrodes instead of the lasso catheter. However, its feasibility to determine PVI has not been studied. OBJECTIVE: The purpose of this study was to compare signals between the mini-basket and lasso catheters at the LA-PV junction...
September 2015: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/25656924/correlation-of-scar-in-cardiac-mri-and-high-resolution-contact-mapping-of-left-ventricle-in-a-chronic-infarct-model
#20
Anees Thajudeen, Warren M Jackman, Brian Stewart, Ivan Cokic, Hiroshi Nakagawa, Michael Shehata, Allen M Amorn, Avinash Kali, Ezh Liu, Doron Harlev, Nathan Bennett, Rohan Dharmakumar, Sumeet S Chugh, Xunzhang Wang
BACKGROUND: Endocardial mapping for scars and abnormal electrograms forms the most essential component of ventricular tachycardia ablation. The utility of ultra-high resolution mapping of ventricular scar was assessed using a multielectrode contact mapping system in a chronic canine infarct model. METHODS: Chronic infarcts were created in five anesthetized dogs by ligating the left anterior descending coronary artery. Late gadolinium-enhanced magnetic resonance imaging (LGE MRI) was obtained 4...
June 2015: Pacing and Clinical Electrophysiology: PACE
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