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Implantable cardiac defibrillators

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https://www.readbyqxmd.com/read/27909501/-two-for-the-price-of-one-a-single-lead-implantable-cardioverter-defibrillator-system-with-a-floating-atrial-dipole
#1
REVIEW
Nicole E Worden Md, Musab Alqasrawi Md, Siva M Krothapalli Md, Alexander Mazur Md
In patients known to be a high risk for sudden cardiac arrest, implantable cardioverter defibrillators (ICD) are a proven therapy to reduce risk of death. However, in patients without conventional indications for pacing, the optimal strategy for type of device, dual- versus single-chamber, remains debatable. The benefit of prophylactic pacing in this category of patients has never been documented. Although available atrial electrograms in a dual chamber system improve interpretation of stored arrhythmia events, allow monitoring of atrial fibrillation and may potentially reduce the risk of inappropriate shocks by enhancing automated arrhythmia discrimination, the use of dual-chamber ICDs has a number of disadvantages...
April 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909498/shock-lead-dislodgement-related-to-its-small-hair-pin-curve-in-a-pocket-a-case-of-ratchet-syndrome
#2
Yuka Taguchi, Kohei Matsushita, Toshiyuki Ishikawa, Yutaka Ogino, Hirooki Matsushita, Junya Hosoda, Katsumi Matsumoto, Satoshi Umemura
There have been few reports about ratchet syndrome. We report a case of ratchet syndrome caused by small hair-pin curve of lead that triggered the lead retract itself. A 69-year-old man with a past history of inferior wall myocardial infarction, presented with progressive congestive heart failure. He underwent implantation of cardiac resynchronization therapy with an implantable cardiac defibrillator (CRTD) at our hospital. At 33 days after implantation, shock lead dislodgement was revealed. X-ray showed that the lead tip was in left subclavian vein, leaving its screw out, and a large part of the proximal portion of the lead was retracted into the pocket, while the other two leads remained in appropriate positions and the device had not rotated...
April 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909495/the-wearable-cardioverter-defibrillator-toy-or-tool
#3
REVIEW
David Duncker Md, Christian Veltmann Md
After the success story of implantable cardioverter/defibrillator systems, prevention of sudden cardiac death (SCD) remains one of the main duties in cardiology. For patients with unkown or transient risk profile for SCD, a wearable cardioverter/defibrillator (WCD) has been established for temporary and effective prevention of sudden arrhythmic death. Several studies have shown safety and efficacy of the WCD, even though randomized studies proving a mortality benefit are still lacking. This review provides an overview of actual WCD data and usage, special indications and possible risks and complications...
April 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909469/value-of-the-wearable-cardioverter-defibrillator-wcd-as-a-bridging-therapy-before-implantation-of-a-cardioverter-defibrillator-icd
#4
REVIEW
Priv- Doz, Dr Johannes Sperzel
Wearable cardioverter defibrillators (WCD), initially available in 2002, have recently experienced more routine use in many institutions as a means of preventing sudden cardiac death (SCD) prior to implantable cardioverter defibrillator (ICD) evaluation or implantation. WCD differ from ICD by their noninvasive nature, making them well suited for patient populations who have a chance for significant cardiac recovery (such as after an acute myocardial infarction). Despite their noninvasive nature, WCD treatment of sustained ventricular tachyarrhythmias is highly successful...
February 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27908579/transient-elastography-in-patients-with-implanted-cardiac-rhythm-devices
#5
Mireen Friedrich-Rust, Fabian Schoelzel, Sven Linzbach, Joerg Bojunga, Stefan Zeuzem, Florian Seeger
BACKGROUND: At present the use of transient elastography (TE) in patients with pacemaker (PM) or implantable cardioverter defibrillator (ICD) devices is not recommended, since the safety due to the electromagnet embarked in the vibrator for producing the shearwave has not been evaluated. However, no adverse events of sonographic examinations in this patient group have been reported. AIMS: The aim of the present study was to evaluate the safety of TE in patients with PM or ICD...
November 17, 2016: Digestive and Liver Disease
https://www.readbyqxmd.com/read/27908349/truncating-flnc-mutations-are-associated-with-high-risk-dilated-and-arrhythmogenic-cardiomyopathies
#6
Martín F Ortiz-Genga, Sofía Cuenca, Matteo Dal Ferro, Esther Zorio, Ricardo Salgado-Aranda, Vicente Climent, Laura Padrón-Barthe, Iria Duro-Aguado, Juan Jiménez-Jáimez, Víctor M Hidalgo-Olivares, Enrique García-Campo, Chiara Lanzillo, M Paz Suárez-Mier, Hagith Yonath, Sonia Marcos-Alonso, Juan P Ochoa, José L Santomé, Diego García-Giustiniani, Jorge L Rodríguez-Garrido, Fernando Domínguez, Marco Merlo, Julián Palomino, María L Peña, Juan P Trujillo, Alicia Martín-Vila, Davide Stolfo, Pilar Molina, Enrique Lara-Pezzi, Francisco E Calvo-Iglesias, Eyal Nof, Leonardo Calò, Roberto Barriales-Villa, Juan R Gimeno-Blanes, Michael Arad, Pablo García-Pavía, Lorenzo Monserrat
BACKGROUND: Filamin C (encoded by the FLNC gene) is essential for sarcomere attachment to the plasmatic membrane. FLNC mutations have been associated with myofibrillar myopathies, and cardiac involvement has been reported in some carriers. Accordingly, since 2012, the authors have included FLNC in the genetic screening of patients with inherited cardiomyopathies and sudden death. OBJECTIVES: The aim of this study was to demonstrate the association between truncating mutations in FLNC and the development of high-risk dilated and arrhythmogenic cardiomyopathies...
December 6, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27908173/pacemaker-and-icd-oversensing-induced-by-movements-near-the-mri-scanner-bore
#7
E Mattei, F Censi, G Calcagnini, R Falsaperla, E Genovese, A Napolitano, V Cannatà
PURPOSE: The effect of the movement near the MRI scanner bore for people with a pacemaker (PM) or an implantable cardioverter defibrillator (ICD) is experimentally evaluated and discussed. METHODS: The authors performed in vitro measurements on a saline-filled human-shaped phantom (male, 170 cm height), equipped first with an MR-conditional PM (bicameral configuration, DDD programming), then with an MR-conditional ICD (biventricular configuration, detection algorithms enable but shock delivery disable)...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27906652/management-of-brugada-syndrome-2016-should-all-high-risk-patients-receive-an-icd-all-high-risk-patients-should-receive-an-implantable-cardiac-defibrillator
#8
Juan Sieira, Pedro Brugada
No abstract text is available yet for this article.
November 2016: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/27906651/management-of-brugada-syndrome-2016-should-all-high-risk-patients-receive-an-icd-alternatives-to-implantable-cardiac-defibrillator-therapy-for-brugada-syndrome
#9
Bernard Belhassen
No abstract text is available yet for this article.
November 2016: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/27905927/characteristics-and-outcomes-of-diabetic-patients-with-an-implantable-cardioverter-defibrillator-in-a-real-world-setting-results-from-the-israeli-icd-registry
#10
Hillel Steiner, Michael Geist, Ilan Goldenberg, Mahmoud Suleiman, Michael Glikson, Alexander Tenenbaum, Moshe Swissa, Enrique Z Fisman, Gregory Golovchiner, Boris Strasberg, Alon Barsheshet
AIMS: There are limited data regarding the effect of diabetes mellitus (DM) on the risks of both appropriate and inappropriate implantable cardioverter defibrillator (ICD) therapy. The present study was designed to compare the outcome of appropriate and inappropriate ICD therapy in patients with or without DM. METHODS AND RESULTS: The risk of a first appropriate ICD therapy for ventricular tachyarrhythmias (including anti tachycardia pacing and shock) was compared between 764 DM and 1346 non-DM patients enrolled in the national Israeli ICD registry...
December 1, 2016: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/27895044/polymorphisms-in-the-gnas-gene-as-predictors-of-ventricular-tachyarrhythmias-and-sudden-cardiac-death-results-from-the-discovery-trial-and-oregon-sudden-unexpected-death-study
#11
Heinrich Wieneke, Jesper Hastrup Svendsen, Jeffrey Lande, Sebastian Spencker, Juan Gabriel Martinez, Bernhard Strohmer, Lauri Toivonen, Hervé Le Marec, F Javier Garcia-Fernandez, Domenico Corrado, Adriana Huertas-Vazquez, Audrey Uy-Evanado, Carmen Rusinaru, Kyndaron Reinier, Csaba Foldesi, Wieslaw Hulak, Sumeet S Chugh, Winfried Siffert
BACKGROUND: Population-based studies suggest that genetic factors contribute to sudden cardiac death (SCD). METHODS AND RESULTS: In the first part of the present study (Diagnostic Data Influence on Disease Management and Relation of Genetic Polymorphisms to Ventricular Tachy-arrhythmia in ICD Patients [DISCOVERY] trial) Cox regression was done to determine if 7 single-nucleotide polymorphisms (SNPs) in 3 genes coding G-protein subunits (GNB3, GNAQ, GNAS) were associated with ventricular tachyarrhythmia (VT) in 1145 patients receiving an implantable cardioverter-defibrillator (ICD)...
November 28, 2016: Journal of the American Heart Association
https://www.readbyqxmd.com/read/27891257/melas-syndrome-with-cardiac-involvement-a-multimodality-imaging-approach
#12
Sara Seitun, Laura Massobrio, Anna Rubegni, Claudia Nesti, Margherita Castiglione Morelli, Sara Boccalini, Athena Galletto Pregliasco, Irilda Budaj, Luca Deferrari, Gian Marco Rosa, Fabrizio Montecucco, Alberto Valbusa
A 49-year-old man presented with chest pain, dyspnea, and lactic acidosis. Left ventricular hypertrophy and myocardial fibrosis were detected. The sequencing of mitochondrial genome (mtDNA) revealed the presence of A to G mtDNA point mutation at position 3243 (m.3243A>G) in tRNA(Leu(UUR)) gene. Diagnosis of cardiac involvement in a patient with Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-like episodes syndrome (MELAS) was made. Due to increased risk of sudden cardiac death, cardioverter defibrillator was implanted...
2016: Case Reports in Cardiology
https://www.readbyqxmd.com/read/27890882/a-case-of-brugada-syndrome-which-developed-status-epilepticus
#13
Misa Matsui, Kimiko Inoue, Harutoshi Fujimura, Saburo Sakoda
A 35-year-old man showed a convulsive attack with consciousness loss and was suspected of having Brugada syndrome 6 months prior to admission to our hospital. At the initial examination, the patient showed conjugate deviation, followed by left limb convulsions and consciousness loss. He regained consciousness after 1 minute, though cardiac arrest from ventricular fibrillation was noted during an electroencephalography (EEG) examination. Sinus rhythm recovered with defibrillation, though the convulsions persisted and a Status Epilepticus developed...
November 25, 2016: Rinshō Shinkeigaku, Clinical Neurology
https://www.readbyqxmd.com/read/27890798/performance-of-the-subcutaneous-implantable-defibrillator-in-primary-prevention-patients-with-and-without-reduced-ejection-fraction-versus-secondary-prevention-patients
#14
Lucas Boersma, Craig S Barr, Martin C Burke, Angel R Leon, Dominic A Theuns, John M Herre, Raul Weiss, Mark S Kremers, Petr Neuzil, Michael P Husby, Nathan Carter, Timothy M Stivland, Michael R Gold
BACKGROUND: The subcutaneous implantable defibrillator (S-ICD) provides an alternative to the transvenous ICD (TV-ICD) for prevention of sudden cardiac death (SCD), but has not been well studied in the most commonly treated TV-ICD patient population, namely primary prevention (PP) patients with left ventricular (LV) dysfunction. OBJECTIVE: These analyses were designed to compare clinical outcomes for PP patients with and without a reduced ejection fraction (EF) and secondary prevention (SP) patients implanted with the S-ICD...
November 24, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27886927/what-we-can-learn-from-super-responders
#15
REVIEW
Alessandro Proclemer, Daniele Muser, Domenico Facchin
This review discusses the state of the art of knowledge to help decision making in patients who are candidates for cardiac resynchronization therapy (CRT) and to analyze the long-term total and cardiac mortality, sudden death, and CRT with a defibrillator intervention rate, as well as the evolution of echocardiographic parameters in patients with a left ventricular (LV) ejection fraction of greater than 50% after CRT implantation. Owing to normalization of LV function in super-responders, the need for a persistent defibrillator backup is also considered...
January 2017: Heart Failure Clinics
https://www.readbyqxmd.com/read/27886920/why-we-have-to-use-cardiac-resynchronization-therapy-pacemaker-more
#16
REVIEW
Jean-Claude Daubert, Raphaël Martins, Christophe Leclercq
Both cardiac resynchronization therapy with a pacemaker (CRT-P) and with a biventricular implantable cardioverter-defibrillator (CRT-D) are electrical treatment modalities validated for the management of chronic heart failure. There is no strong scientific evidence that a CRT-D must be offered to all candidates. Common sense should limit the prescription of these costly and complicated devices. The choice of CRT-P is currently acceptable. A direction to explore could be to downgrade from CRT-D to CRT-P at the time of battery depletion in patients with large reverse remodeling and no ventricular tachycardia and ventricular fibrillation detected...
January 2017: Heart Failure Clinics
https://www.readbyqxmd.com/read/27886919/why-the-authors-use-cardiac-resynchronization-therapy-with-defibrillators
#17
REVIEW
Edward Sze, James P Daubert
Cardiac resynchronization therapy (CRT) improves left ventricular function, especially in patients with left bundle branch block or those receiving chronic right ventricular pacing. CRT is typically accomplished by placing a right ventricular endocardial pacing lead and a left ventricular pacing lead via the coronary sinus to a coronary vein overlying the lateral or posterolateral left ventricle. CRT can be combined with an implantable defibrillator or with a pacemaker. Limited data are available to compare these two versions of CRT head to head...
January 2017: Heart Failure Clinics
https://www.readbyqxmd.com/read/27885745/exaggerated-reactivity-of-parasympathetic-nerves-is-involved-in-ventricular-fibrillation-in-j-wave-syndrome
#18
Tetsuji Shinohara, Hidekazu Kondo, Toyokazu Otsubo, Akira Fukui, Kunio Yufu, Mikiko Nakagawa, Naohiko Takahashi
INTRODUCTION: Brugada syndrome (BrS) and early repolarization syndrome (ERS) are termed the J-wave syndrome. In most cases of J-wave syndrome, ventricular fibrillation (VF) often occurs around midnight or in the early morning when parasympathetic tone is augmented. OBJECTIVE: The purpose of this study was to clarify the relationship between VF and autonomic nervous activity in patients with J-wave syndrome. METHODS AND RESULTS: We enrolled 28 consecutive patients with J-wave syndrome (20 BrS and 8 ERS) in whom implantable cardioverter-defibrillators (ICDs) were implanted between January 2002 and December 2014...
November 25, 2016: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/27884249/long-term-arrhythmic-and-nonarrhythmic-outcomes-of-lamin-a-c-mutation-carriers
#19
Saurabh Kumar, Samuel H Baldinger, Estelle Gandjbakhch, Philippe Maury, Jean-Marc Sellal, Alexander F A Androulakis, Xavier Waintraub, Philippe Charron, Anne Rollin, Pascale Richard, William G Stevenson, Ciorsti J Macintyre, Carolyn Y Ho, Tina Thompson, Jitendra K Vohra, Jonathan M Kalman, Katja Zeppenfeld, Frederic Sacher, Usha B Tedrow, Neal K Lakdawala
BACKGROUND: Mutations in LMNA are variably expressed and may cause cardiomyopathy, atrioventricular block (AVB), or atrial arrhythmias (AAs) and ventricular arrhythmias (VA). Detailed natural history studies of LMNA-associated arrhythmic and nonarrhythmic outcomes are limited, and the prognostic significance of the index cardiac phenotype remains uncertain. OBJECTIVES: This study sought to describe the arrhythmic and nonarrhythmic outcomes of LMNA mutation carriers and to assess the prognostic significance of the index cardiac phenotype...
November 29, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27881561/reassessment-of-cardiac-function-and-implantable-cardioverter-defibrillator-use-among-medicare-patients-with-low-ejection-fraction-after-myocardial-infarction
#20
Sean D Pokorney, Amy L Miller, Anita Y Chen, Laine Thomas, Gregg C Fonarow, James A de Lemos, Sana M Al-Khatib, Eric J Velazquez, Eric D Peterson, Tracy Y Wang
BACKGROUND: -Guidelines recommend that patients with low ejection fractions (EF) post-myocardial infarction (MI) have their EF reassessed 40 days after MI for implantable cardioverter-defibrillator (ICD) candidacy. This study examines rates of EF reassessment and their association with 1-year ICD implantation in post-MI patients with low EF. METHODS: -We examined rates of post-discharge EF reassessment and ICD implantation among 10,289 Medicare-insured patients ≥65 years with an EF≤35% during the index MI admission from 1/2007-9/2010 in ACTION Registry-GWTG...
November 16, 2016: Circulation
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