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Journal of Cardiovascular Electrophysiology

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https://www.readbyqxmd.com/read/28218443/atrial-entrainment-during-posterior-fascicular-ventricular-tachycardia
#1
Krishna Kumar Mohanan Nair, Narayanan Namboodiri, Anees Thajudeen, Krishna Chaitanya, Sreevilasam Pushpangadhan Abhilash, Ajitkumar Valaparambil
A 20-year-old gentleman underwent electrophysiology study for paroxysmal palpitation. The surface electrocardiogram during sinus rhythm did not show any preexcitation. Echocardiogram was normal.  Basal intervals including AH and HV intervals were 115 ms and 42 ms, respectively. This article is protected by copyright. All rights reserved.
February 20, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28211197/recurrences-in-the-blanking-period-and-12-month-success-rate-by-continuous-cardiac-monitoring-after-cryoablation-of-paroxysmal-and-non-paroxysmal-atrial-fibrillation
#2
Paolo Pieragnoli, Alessandro Paoletti Perini, Giuseppe Ricciardi, Luca Checchi, Andrea Giomi, Iacopo Muraca, Letizia Mannucci, Luigi Padeletti
INTRODUCTION: Recurrences within the blanking period (early recurrences) are common after atrial fibrillation (AF) ablation by pulmonary vein isolation (PVI), but their clinical significance is still controversial. We aimed at evaluating the significance of within-blanking recurrences at 12-month follow-up after cryoballoon (CB) PVI, and to assess the real procedural success rate by continuous monitoring of cardiac rhythm. METHODS AND RESULTS: Sixty consecutive AF patients (34 paroxysmal, 56...
February 17, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28211133/an-unusual-short-rp-tachycardia-what-is-the-mechanism
#3
Joshua Balog
A 68-year-old man with a history of a structurally normal heart by echocardiography, an unsuccessful ablation of a narrow complex tachycardia and frequent symptoms of palpitations presents for an electrophysiology study and ablation. Baseline 12-lead EKG demonstrated sinus rhythm without ventricular preexcitation. This article is protected by copyright. All rights reserved.
February 17, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28190278/surface-ecg-f-wave-analysis-at-initial-onset-of-paroxysmal-and-persistent-atrial-fibrillation
#4
Parth Sharma, Tyler W Barrett, Jason Ng, Claire Knoten, Allison J Ferreira, Jeffrey J Goldberger
INTRODUCTION: Dominant frequency (DF) analysis of electrocardiograms (ECGs) from patients with paroxysmal (PAF) and persistent (PeAF) atrial fibrillation has identified higher DFs in PeAF. We therefore hypothesized that among patients initially presenting to the emergency department (ED) with new onset AF, surface ECG features could differentiate PeAF from PAF. METHODS AND RESULTS: Initial 12 lead ECGs from patients presenting to the ED with a first episode of symptomatic AF were analyzed...
February 11, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28188971/wide-qrs-tachycardia-with-left-bundle-branch-block-morphology-what-is-the-mechanism
#5
Krishna Kumar Mohanan Nair, Narayanan Namboodiri, Krishna Chaitanya, Sreevilasam Pushpangadhan Abhilash, Anees Thajudeen, Ajitkumar Valaparambil
A 55-year-old woman was referred for radiofrequency catheter ablation of narrow QRS tachycardia that was terminated with intravenous adenosine. Twelve-lead ECG was normal during sinus rhythm. The electrophysiological study showed an AH interval of 114 ms and HV interval of 42 ms during sinus rhythm. This article is protected by copyright. All rights reserved.
February 11, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28188960/occurrence-of-focal-atrial-tachycardia-during-the-ablation-procedure-is-associated-with-arrhythmia-recurrence-after-termination-of-persistent-atrial-fibrillation
#6
Shinsuke Iwai, Yoshihide Takahashi, Mayumi Masumura, Syu Yamashita, Junichi Doi, Tasuku Yamamoto, Atsushi Sakakibara, Hidetsugu Nomoto, Yoshinori Yoshida, Tomoyo Sugiyama, Tetsuo Oumi, Masakazu Ohno, Yasuhiro Sato, Kenzo Hirao, Mitsuaki Isobe
INTRODUCTION: Catheter ablation can terminate persistent atrial fibrillation (AF). However, atrial tachycardia (AT) often arises after termination of AF. METHODS AND RESULTS: Of 215 patients who underwent index stepwise ablation for persistent AF, 141 (66%) patients (64±9 years) in whom AF terminated during the ablation procedure were studied. If AF converted into AT, ablation for AT was subsequently performed. ATs were categorized as focal or macro-reentrant AT...
February 11, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28185360/effect-of-environmental-impedance-surrounding-a-radiofrequency-ablation-catheter-electrode-on-lesion-characteristics
#7
Duy T Nguyen, Kianna Nguyen, Lijun Zheng, Joseph Schuller, Matthew Zipse, Wendy S Tzou, William H Sauer
INTRODUCTION: The electrical conductivity of the environment surrounding a catheter electrode may affect radiofrequency (RF) current. A higher impedance environment enveloping a catheter tip can be insulating and thus direct RF preferentially into targeted cardiac tissue. We sought to evaluate whether different environmental impedances will affect RF lesions. METHODS: An ex vivo model using bovine myocardium, load cell, and 4 mm ablation catheter was tested using a circulating bath of normal (0...
February 10, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28185356/mapping-ripples-or-waves-in-atrial-fibrillation
#8
EDITORIAL
Junaid A B Zaman, Christopher A B Kowalewski, Sanjiv M Narayan
Therapy for persistent atrial fibrillation (AF) is limited by uncertainty in its mechanisms yet, unlike in organized rhythms, mechanisms for AF may vary dramatically with mapping technique. The traditional approach of drawing contour maps of AF by assigning an onset time to each electrogram reveals disordered activity in patients with permanent AF at non-arrhythmia surgery.(1,2) This article is protected by copyright. All rights reserved.
February 10, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28185355/catheter-ablation-of-ventricular-tachycardia-in-patients-with-mitraclip-device-preliminary-findings
#9
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/28185354/eligibility-of-pacemaker-patients-for-subcutaneous-implantable-cardioverter-defibrillators
#10
James E Ip, Michael S Wu, Peter J Kennel, George Thomas, Christopher F Liu, Jim W Cheung, Steven M Markowitz, Bruce B Lerman
INTRODUCTION: The subcutaneous implantable cardioverter defibrillator (ICD) has emerged as a viable therapeutic option for patients who are deemed high risk for sudden cardiac death. Previous studies have shown that 7-15% of patients are not candidates for the S-ICD based on their intrinsic QRS/T-wave morphology. Presently, it is not known if the S-ICD can be considered as supplementary therapy in patients who are ventricularly paced. We sought to determine the proportion of ventricularly paced patients who would qualify for an S-ICD...
February 10, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28185351/persistent-atrial-fibrillation-ablation-with-or-without-contact-force-sensing
#11
Ayman A Hussein, Amr F Barakat, Walid I Saliba, Khaldoun G Tarakji, Mohamed Bassiouny, Bryan Baranowski, Patrick Tchou, Mandeep Bhargava, Thomas Dresing, Thomas Callahan, Daniel Cantillon, Mohamed Kanj, Bruce D Lindsay, Oussama M Wazni
INTRODUCTION: Arrhythmia recurrences remain common after ablation of persistent atrial fibrillation (PersAF). Contact force sensing catheters have been introduced for objective assessment of contact during radiofrequency application and have been suggested to improve outcomes in ablation of paroxysmal AF, but little is known about their role in PersAF ablation. We aimed to compare the procedural profiles and outcomes of (PersAF) ablation with or without using contact force (CF) sensing catheters...
February 10, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28185348/two-independent-mapping-techniques-identify-rotational-activity-patterns-at-sites-of-local-termination-during-persistent-atrial-fibrillation
#12
Mahmood Alhusseini, David Vidmar, Gabriela L Meckler, Christopher Kowalewski, Fatemah Shenasa, Paul J Wang, Sanjiv M Narayan, Wouter-Jan Rappel
: The mechanisms for atrial fibrillation (AF) are unclear in part because diverse mapping techniques yield diverse maps ranging from stable organized sources to highly disordered waves. We hypothesized that AF mechanisms may be clarified if mapping techniques were compared in the same patients, and referenced to a clinical endpoint. We compared 2 independent AF mapping techniques in patients in whom local ablation terminated persistent AF before pulmonary vein isolation (PVI). TECHNIQUES AND RESULTS: We identified 12 patients with persistent AF (61...
February 10, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28181727/significant-discrepancy-between-estimated-and-actual-longevity-in-st-jude-medical-sjm-implantable-cardioverter-defibrillators
#13
Harish Doppalapudi, James Barrios, Jose Cuellar, Melanie Gannon, Takumi Yamada, Vineet Kumar, William R Maddox, Vance J Plumb, Todd M Brown, H Tom McElderry
BACKGROUND: Real-time estimated longevity has been reported in pacemakers for several years, and was recently introduced in ICDs. OBJECTIVE: We sought to evaluate the accuracy of this longevity estimate in St. Jude Medical (SJM) ICDs, especially as the device battery approaches depletion. METHODS: Among patients with SJM ICDs who underwent generator replacements due to reaching elective replacement indicator (ERI) at our institution, we identified those with devices that provided longevity estimates and reviewed their device interrogations in the 18 months prior to ERI...
February 9, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28181717/paradoxical-increase-of-stimulus-to-atrium-interval-during-para-hisian-pacing
#14
Krishna Kumar Mohanan Nair, Anees Thajudeen, Narayanan Namboodiri, Krishna Chaithanya, Sreevilasam Pushpangadhan Abhilash, Ajitkumar Valaparambil
No abstract text is available yet for this article.
February 9, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28176442/impact-of-remote-monitoring-on-long-term-prognosis-in-heart-failure-patients-in-a-real-world-cohort-results-from-all-comers-commit-hf-trial
#15
Anna Kurek, Mateusz Tajstra, Elzbieta Gadula-Gacek, Piotr Buchta, Michal Skrzypek, Lukasz Pyka, Michal Wasiak, Malgorzata Swietlinska, Michal Hawranek, Lech Polonski, Mariusz Gasior, Jedrzej Kosiuk
BACKGROUND: Randomized controlled trials demonstrate that remote monitoring (RM) of implantable cardioverter-defibrillators (ICDs) and cardiac resynchronization therapy devices (CRT-D) may improve quality of care and prognosis in heart failure (HF) patients. However, the impact of RM on long-term mortality in a real-world cohort is still not well examined. METHODS AND RESULTS: This study was designed as a matched cohort study based on the COMMIT-HF trial - a single-center, ongoing prospective observational registry (NCT02536443)...
February 8, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28176412/lead-extraction-the-importance-of-preparation-and-remaining-opportunities
#16
EDITORIAL
Deepak Padmanabhan, Samuel J Asirvatham
Implantation of cardiac implantable electronic devices (CIEDs) has increased exponentially consequent to the emergence of newer indications. The complications of CIED implantations have also grown in tandem. A worldwide rate of nearly 10,000-15,000 leads per year is estimated for extraction. Given the variable length of time the leads have been implanted along with the rapid change in technology and physician preference, there is a wide spectrum of patients presenting for lead extraction. Prevention of complications with successful extraction of all foreign material remains the biggest challenge of the procedure...
February 8, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28176410/echocardiographic-predictors-of-long-term-survival-in-patients-undergoing-cardiac-resynchronization-therapy-what-is-the-optimal-metric
#17
John Rickard, Bryan Baranowski, W H Wilson Tang, Richard A Grimm, Mark Niebauer, Daniel Cantillion, Bruce L Wilkoff, Niraj Varma
BACKGROUND: Multiple definitions of reverse ventricular remodeling(RVR) employing various changes in left ventricular end-systolic (LVESV) or diastolic volumes (LVEDV) or left ventricular ejection fraction(LVEF) have been used in determining cardiac resynchronization (CRT) response, making comparability across studies difficult. We compared different metrics to each other, and in combination, in terms of association with long-term outcomes. METHODS: We collected clinical and echocardiographic data on 436 patients undergoing CRT...
February 8, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28176398/the-relationship-of-antitachycardia-pacing-versus-shock-in-an-implantable-cardioverter-defibrillator-population-and-the-risk-of-mortality-just-an-association
#18
EDITORIAL
Jonathan C Hsu, Kurt S Hoffmayer
The mortality benefit of implantable cardioverter-defibrillator (ICD) therapy has been shown for both primary and secondary prevention of sudden cardiac death and in both ischemic and non-ischemic cardiomyopathy patients.(1-3) Although ICD shocks may be life-saving, avoiding shocks by attempting to terminate ventricular arrhythmias with anti-tachycardia pacing (ATP) may be beneficial as shocks can cause patient discomfort and may themselves be associated with increased mortality.(4) This article is protected by copyright...
February 8, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28128883/early-canadian-multi-center-experience-with-watchman-for-percutaneous-left-atrial-appendage-closure
#19
Jacqueline Saw, Peter Fahmy, Lorenzo Azzalini, Jean-Francois Marquis, Benjamin Hibbert, Carlos Morillo, Aldo Carrizo, Reda Ibrahim
BACKGROUND: There is limited data with WATCHMAN for left atrial appendage (LAA) closure in patients with non-valvular atrial fibrillation (AF) and contraindications to anticoagulation. The purpose of this study was to evaluate the safety and efficacy of WATCHMAN in our early Canadian experience. METHODS: We report our pooled consecutive series of patients who underwent WATCHMAN implantation at 4 major Canadian centers. Indications for LAA closure were CHADS2 ≥ 1 or CHA2 DS2 -VASc ≥ 2, and contraindication/intolerance to or failure on anticoagulation...
January 27, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28128491/association-of-antitachycardia-pacing-or-shocks-with-survival-in-69-000-patients-with-an-implantable-defibrillator
#20
S Adam Strickberger, Robert Canby, Joshua Cooper, Mark Coppess, Rahul Doshi, Roy John, Allison T Connolly, Gregory Roberts, Edward Karst, Emile G Daoud
AIMS: Anti-tachycardia pacing (ATP) is an effective treatment for ventricular tachycardia (VT) and can reduce the frequency of shocks in patients with an implantable defibrillator (ICD). The association between survival and ATP, as compared to a shock, has not been confirmed in a large patient population. This study aims to determine if patients with an ICD receiving ATP have lower mortality, as compared to those receiving shock. METHODS: 69,368 patients underwent ICD implantation between October 2008 and May 2013 and were enrolled in the remote-monitoring network Merlin...
January 27, 2017: Journal of Cardiovascular Electrophysiology
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