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Catheter Mapping

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https://www.readbyqxmd.com/read/28227087/maximum-likelihood-cardiac-conduction-velocity-estimation-from-sequential-mapping-in-the-presence-of-activation-time-noise-with-unknown-variances
#1
Mohammad Hassan Shariat, Saeed Gazor, Damian Redfearn, Mohammad Hassan Shariat, Saeed Gazor, Damian Redfearn, Mohammad Hassan Shariat, Damian Redfearn
The cardiac conduction velocity (CV) can be estimated by analysing the activation times (ATs) and the locations of the electrodes that are used for the intracardiac electrogram (IEGM) recording. Here, we study the problem of the CV estimation in sequential mapping without using any independent electrogram as a time alignment reference. We assume that the IEGMs are sequentially recorded from several sites, where at each site, at least two of the catheter's electrodes are in contact with the cardiac tissue. We consider the planar wavefront with stable CV that propagates within the recording sites throughout our data collection period...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226546/cardiac-conduction-velocity-estimation-from-sequential-mapping-assuming-known-gaussian-distribution-for-activation-time-estimation-error
#2
Mohammad Hassan Shariat, Saeed Gazor, Damian Redfearn, Mohammad Hassan Shariat, Saeed Gazor, Damian Redfearn, Saeed Gazor, Mohammad Hassan Shariat, Damian Redfearn
In this paper, we study the problem of the cardiac conduction velocity (CCV) estimation for the sequential intracardiac mapping. We assume that the intracardiac electrograms of several cardiac sites are sequentially recorded, their activation times (ATs) are extracted, and the corresponding wavefronts are specified. The locations of the mapping catheter's electrodes and the ATs of the wavefronts are used here for the CCV estimation. We assume that the extracted ATs include some estimation errors, which we model with zero-mean white Gaussian noise values with known variances...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226544/kurtosis-as-a-statistical-approach-to-identify-the-pivot-point-of-the-rotor
#3
Shivaram P Arunachalam, Elizabeth M Annoni, Siva K Mulpuru, Paul A Friedman, Elena G Tolkacheva, Shivaram P Arunachalam, Elizabeth M Annoni, Siva K Mulpuru, Paul A Friedman, Elena G Tolkacheva, Elena G Tolkacheva, Paul A Friedman, Elizabeth M Annoni, Siva K Mulpuru, Shivaram P Arunachalam
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia that causes stroke affecting more than 2.3 million people in the US. Catheter ablation to terminate AF is successful for paroxysmal AF but suffers limitations with persistent AF patients as current mapping methods cannot identify AF active substrates outside of pulmonary vein region. In this work, we developed a novel Kurtosis based mapping technique that can accurately identify pivot points of the rotors that were induced in ex-vivo isolated rabbit heart...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28217232/successful-percutaneous-epicardial-catheter-ablation-of-ventricular-tachycardia-arising-from-the-crux-of-the-heart-in-a-patient-with-prior-coronary-artery-bypass-grafting
#4
Naoki Yoshida, Takumi Yamada
A 63-year-old man with a history of remote inferior myocardial infarction and coronary artery bypass grafting (CABG) underwent catheter ablation of ventricular tachycardia (VT). Epicardial catheter ablation of the VT was successful at the crux of the heart despite limited mapping within the pericardial space due to pericardial adhesion. Percutaneous subxiphoidal pericardial approach is usually impossible in patients with a history of open heart surgery due to pericardial adhesions. This report suggested that epicardial VT arising from the crux of the heart could be successfully treated by catheter ablation via subxiphoidal pericardial approach despite pericardial adhesions complicated by prior CABG...
February 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28217229/evaluation-of-the-characteristics-of-rotational-activation-at-high-dominant-frequency-and-complex-fractionated-atrial-electrogram-sites-during-atrial-fibrillation
#5
Koji Kumagai, Kentaro Minami, Daisuke Kutsuzawa, Shigeru Oshima
BACKGROUND: High-dominant frequency (DF) and continuous complex fractionated atrial electrogram (CFAE) sites as surrogates for localized sources maintaining atrial fibrillation (AF) are potential AF ablation targets. This study aimed to evaluate the characteristics of a rotational activation at high-DF and continuous CFAE sites in AF patients. METHODS: Thirty-two consecutive AF patients (5 paroxysmal and 27 non-paroxysmal) underwent ablation using the NavX system...
February 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28217228/spatiotemporal-characteristics-of-atrial-fibrillation-electrograms-a-novel-marker-for-arrhythmia-stability-and-termination
#6
Shivshankar Thanigaimani, Anthony G Brooks, Pawel Kuklik, Darragh J Twomey, Samantha Franklin, Erik Noschka, Darius Chapman, Rajeev K Pathak, Rajiv Mahajan, Prashanthan Sanders, Dennis H Lau
BACKGROUND: Sequentially mapped complex fractionated atrial electrograms (CFAE) and dominant frequency (DF) sites have been targeted during catheter ablation for atrial fibrillation (AF). However, these strategies have yielded variable success and have not been shown to correlate consistently with AF dynamics. Here, we evaluated whether the spatiotemporal stability of CFAE and DF may be a better marker of AF sustenance and termination. METHODS: Eighteen sheep with 12 weeks of "one-kidney, one-clip" hypertension underwent open-chest studies...
February 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28215568/reduction-in-radiation-dose-for-atrial-fibrillation-ablation-over-time-a-12-year-single-centre-experience-of-2-344-patients
#7
Aleksandr Voskoboinik, Elana S Kalman, Yonatan Savicky, Paul B Sparks, Joseph B Morton, Geoffrey Lee, Peter M Kistler, Jonathan M Kalman
BACKGROUND: Pulmonary vein isolation (PVI) is a well-established treatment for atrial fibrillation (AF), with contact force-sensing catheters joining 3D-mapping systems and image integration as technological advancements over the last decade. OBJECTIVE: To analyze trends in radiation exposure at our centre for AF ablation over the last 12 years. METHODS: We reviewed prospectively collected data of 2,344 consecutive PVI procedures for either paroxysmal or persistent AF between 1/2004 - 12/2015...
February 12, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28213055/electrophysiological-measurements-that-can-explain-and-guide-temporary-accelerated-pacing-to-avert-re-occurrence-of-torsade-de-pointes-arrhythmias-in-the-canine-chronic-atrioventricular-block-model
#8
Sofieke C Wijers, Alexandre Bossu, Albert Dunnink, Jet D M Beekman, Rosanne Varkevisser, Alfonso Aranda Hernández, Mathias Meine, Marc A Vos
BACKGROUND: Pacing at higher rates is known to suppress Torsade de Pointes (TdP) arrhythmias. Nevertheless, exact application and mechanism need further clarification. In the anesthetized, canine, chronic atrioventricular block model, ventricular remodeling is responsible for a high and reproducible incidence of TdP upon a challenge with dofetilide. OBJECTIVE: We used this model to investigate by what mechanism accelerated pacing averts TdP and what repolarization parameter could be used to guide temporary applied accelerated pacing (TAP)...
February 14, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28212738/delayed-efficacy-of-radiofrequency-catheter-ablation-on-ventricular-arrhythmias-originating-from-the-left-ventricular-anterobasal-wall
#9
Ligang Ding, Bingbo Hou, Lingmin Wu, Yu Qiao, Wei Sun, Jinrui Guo, Lihui Zheng, Gang Chen, Linfeng Zhang, Shu Zhang, Yan Yao
BACKGROUND: Ventricular arrhythmias (VAs) originating from the left ventricular anterobasal wall (LV-ABW) may represent a therapeutic challenge. OBJECTIVE: The purpose of this study was to investigate the delayed efficacy of radiofrequency catheter (RFCA) ablation without an epicardial approach on VAs originating from the LV-ABW. METHODS: Eighty patients (mean age 46.9 ┬▒ 14.9 years; 47 male) with VAs originating from the LV-ABW were enrolled...
March 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28202257/radiofrequency-catheter-ablation-of-atrioventricular-node-reentrant-tachycardia-in-children-with-limited-fluoroscopy
#10
Moshe Swissa, Einat Birk, Tamir Dagan, Sody Abby Naimer, Michal Fogelman, Tom Einbinder, Elchanan Bruckheimer, Rami Fogelman
BACKGROUND: Limited fluoroscopy cryo-ablation using a 3D electro-anatomical system (3DS) has been used for AVNRT in children. We aimed to facilitate a fluoroscopy limited approach of RF ablation of AVNRT in children. METHODS: A retrospective study was performed of procedure parameters in children undergoing RF ablation of AVNRT in 75 consecutive children (June 2011 to November 2013 - Group A) using standard fluoroscopy techniques compared to those of 64 consecutive children (December 2013 to May 2015 - Group B), using a fluoroscopy limited approach with 3DS...
January 31, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28201731/radiofrequency-catheter-ablation-of-left-sided-accessory-pathways-in-children-using-a-new-fluoroscopy-integrated-3d-mapping-system
#11
Fabrizio Drago, Gino Grifoni, Romolo Remoli, Mario Salvatore Russo, Daniela Righi, Vincenzo Pazzano, Rosalinda Palmieri, Silvia Placidi, Fabio Anselmo Saputo, Massimo Stefano Silvetti
No abstract text is available yet for this article.
February 15, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28197345/ventricular-tachycardia-originating-from-moderator-band-new-perspective-on-catheter-ablation
#12
Jin-Yi Li, Jing-Bo Jiang, Yan He, Jian-Chun Luo, Guo-Qiang Zhong
A 59-year-old woman was referred to the institution with burdens of idiopathic ventricular tachycardia (IVT). Electroanatomic mapping revealed a complex fractionated, high frequency potential with long duration preceding the QRS onset of the IVT. The real end point of ablation was the disappearance of the conduction block of Purkinje potential during the sinus rhythm besides the disappearance of the inducible tachycardia. Location of distal catheter was at the moderator band (MB) by transthoracic echocardiography (TTE)...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28185355/catheter-ablation-of-ventricular-tachycardia-in-patients-with-mitraclip-device-preliminary-findings
#13
Laurent M Haegeli, Giuseppe D'Angelo, Nicola Trevisi, Stefano Stella, Alexander Breitenstein, Firat Duru, Corinna Brunckhorst, Paolo Della Bella
INTRODUCTION: Patients with mitral regurgitation are increasingly treated by percutaneous implantation of a MitraClip device. We investigate the feasibility and safety of the transmitral catheter route for catheter ablation of VT (ventricular tachycardia) in these patients. METHODS: The mitral valve with the MitraClip in situ was crossed under transesophageal three-dimensional echocardiographic and fluoroscopic guidance using a steerable sheath for ablation of the left ventricle...
February 10, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28174170/does-additional-electrogram-guided-ablation-after-linear-ablation-reduce-recurrence-after-catheter-ablation-for-longstanding-persistent-atrial-fibrillation-a-prospective-randomized-study
#14
Tae-Hoon Kim, Jae-Sun Uhm, Jong-Youn Kim, Boyoung Joung, Moon-Hyoung Lee, Hui-Nam Pak
BACKGROUND: Although circumferential pulmonary vein isolation (CPVI) catheter ablation may not be sufficient for long-standing persistent atrial fibrillation (L-PeAF), it is not clear which ablation strategy is beneficial in addition to CPVI. We sought to investigate whether additional complex fractionated atrial electrogram (CFAE)-guided ablation improves clinical outcomes in L-PeAF patients who exhibit continuous atrial fibrillation (AF) after CPVI and linear ablation (Line). METHODS AND RESULTS: This study enrolled 137 L-PeAF patients (71...
February 7, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28167090/ablation-of-ventricular-tachycardia-in-arrhythmogenic-right-ventricular-dysplasia
#15
REVIEW
Rajeev K Pathak, Fermin C Garcia
Endocardial and epicardial electroanatomical mapping and ablation is a safe and effective therapy in the treatment of right ventricle arrhythmias occurring in the setting of arrhythmogenic right ventricular cardiomyopathy (ARVD). Careful mapping and ablation plans must be tailored for each patient based on comorbidities and ventricular tachycardia morphologies. This review focuses on the catheter ablation for ventricular arrhythmias in patients with ARVD.
March 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28167087/pace-mapping-to-localize-the-critical-isthmus-of-ventricular-tachycardia
#16
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/28167086/entrainment-mapping
#17
REVIEW
Saurabh Kumar, Usha B Tedrow, William G Stevenson
Mapping during ventricular tachycardia (VT) aims to elucidate mechanism, describe myocardial propagation, and identify the origin and critical regions of VT that can be targeted for ablation, most commonly with radiofrequency ablation. Most VTs in structural heart disease are due to macro-reentry in and around scar. A combination of mapping techniques, including mapping to identify the arrhythmia substrate, activation sequence mapping, pace-mapping, and entrainment mapping, may be used to identify putative ablation targets...
March 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28167085/catheter-ablation-for-ventricular-tachycardia-in-patients-with-nonischemic-cardiomyopathy
#18
REVIEW
Nathaniel Thompson, Antonio Frontera, Masateru Takigawa, Ghassen Cheniti, Gregoire Massoullie, Hubert Cochet, Arnaud Denis, Arnaud Chaumeil, Nicolas Derval, Meleze Hocini, Michel Haissaguerre, Pierre Jais, Frederic Sacher
Although catheter ablation has been successful in reducing the recurrence of ventricular tachycardia in patients with ischemic disease, outcomes in patients with nonischemic cardiomyopathy (NICM) have not met with the same results. Success is predicated on a methodical approach to diagnosis of disease type and identification of critical substrate, and the ablation strategies used. Cardiac MRI with delayed enhancement is able to identify areas of substrate involvement, particularly in situations when conventional catheter mapping is not able to do so...
March 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28167084/ventricular-tachycardia-in-ischemic-heart-disease
#19
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/28167081/premature-ventricular-complex-ablation-in-structural-heart-disease
#20
REVIEW
Rakesh Latchamsetty, Frank Bogun
Frequent premature ventricular complexes (PVCs) in patients with underlying structural heart disease, particular after myocardial infarction, can predict increased mortality. Use of antiarrhythmic medications to suppress PVCs in this setting can result in a further increase in mortality. High PVC burdens in patients with structural heart disease can cause or worsen cardiomyopathy and successful elimination of PVCs with catheter ablation can improve or, in some cases normalize, cardiac function. PVCs may also trigger more malignant ventricular arrhythmias, particularly in patients with previous myocardial infarction, and when identified can be mapped and ablated...
March 2017: Cardiac Electrophysiology Clinics
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