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https://www.readbyqxmd.com/read/28618061/electrical-storm-in-a-patient-with-duchenne-muscular-dystrophy-cardiomyopathy-triggered-by-abrupt-%C3%AE-blocker-interruption
#1
Nikolaos Fragakis, Melani Sotiriadou, Lydia Krexi, Vassilios Vassilikos
We present a case of a young man with Duchenne muscular dystrophy cardiomyopathy (DMDC) having an implantable cardioverter defibrillator for secondary prevention, who presented with electrical storm shortly after β-blocker interruption. The patient was stabilized and remained free of ventricular arrhythmias soon after reinitiating b-adrenoreceptor antagonists. The present case highlights the importance of sympathetic blockage in patients with DMDC due to existing pathophysiology of excess diastolic Ca(2+) leak from sarcoplasmic reticulum as a result of ryanodine receptor dysfunction...
June 15, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28595339/cardiac-resynchronization-therapy-and-electrical-storm-results-of-the-observational-registry-on-long-term-outcome-of-icd-patients-observo-icd
#2
Federico Guerra, Pietro Palmisano, Gabriele Dell'Era, Matteo Ziacchi, Ernesto Ammendola, Giulia Pongetti, Paolo Bonelli, Francesca Patani, Chiara Devecchi, Michele Accogli, Eraldo Occhetta, Gerardo Nigro, Mauro Biffi, Giuseppe Boriani, Alessandro Capucci
Aims: Electrical storm (ES) is a condition defined as three or more episodes of ventricular fibrillation (VF) or ventricular tachycardia (VT) within 24 h, and usually coexist with advanced heart failure in patients with structural heart disease. The aim of the present study is to test whether cardiac resynchronization therapy (CRT) can be associated with a lower incidence of ES. Methods and results: The OBSERVO-ICD (NCT02735811) is a multicentre, retrospective registry, enrolling all consecutive patients undergoing ICD or CRT-D implantation from 2010 to 2012 in five Italian high-volume arrhythmia centres...
June 7, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28576780/outcomes-of-ventricular-tachycardia-ablation-using-percutaneous-left-ventricular-assist-devices
#3
Shigeki Kusa, Marc A Miller, William Whang, Yoshinari Enomoto, Jorge G Panizo, Jin Iwasawa, Subbarao Choudry, Sean Pinney, Anthony Gomes, Noelle Langan, Jacob S Koruth, Andre d'Avila, Vivek Y Reddy, Srinivas R Dukkipati
BACKGROUND: Although percutaneous left ventricular assist devices (pLVADs) facilitate mapping and ablation of hemodynamically unstable ventricular tachycardia (VT), there is limited data whether clinical outcomes are improved. We sought to retrospectively compare the outcomes of patients undergoing scar-related VT ablation with and without pLVAD support. METHODS AND RESULTS: The study population comprised 194 patients (109 pLVAD and 85 non-pLVAD). The pLVAD group more often had dilated cardiomyopathy (33% versus 13%; P=0...
June 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28535346/optimization-of-current-injection-in-algainp-core-shell-nanowire-light-emitting-diodes
#4
Pyry Kivisaari, Alexander Berg, Mohammad Karimi, Kristian Storm, Steven Limpert, Jani Oksanen, Lars Samuelson, Håkan Pettersson, Magnus T Borgström
Core-shell nanowires offer great potential to enhance the efficiency of light-emitting diodes (LEDs) and expand the attainable wavelength range of LEDs over the whole visible spectrum. Additionally, nanowire (NW) LEDs can offer both improved light extraction and emission enhancement if the diameter of the wires is not larger than half the emission wavelength (λ/2). However, AlGaInP nanowire LEDs have so far failed to match the high efficiencies of traditional planar technologies, and the parameters limiting the efficiency remain unidentified...
June 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28492156/electrical-storm-or-naxos-syndrome-in-an-adult-causing-recurrent-syncope
#5
Muhammad Furrakh Maqbool, Muhammad Sajid, Ahmed Noeman
Among the rare and well-known causes of sudden cardiac death by malignant arrthymias is a condition called arrhythmogenic right ventricular cardiomyopathy. It commonly presents with right ventricular dilatation, dysfunction and ventricular tachycardia of left bundle branch morphology due to fibro-fatty infiltration of right ventricle in second to fifth decade of life, making it an unrecognized and important cause of sudden cardiac death. Two rare variants of arrhythmogenic right ventricular cardiomyopathy are Carvajal syndrome and Naxos syndrome...
April 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28491737/catheter-ablation-of-ventricular-tachycardia-in-the-setting-of-electrical-storm-after-revascularization-of-a-chronic-total-occlusion-of-the-right-coronary-artery-an-uncommon-presentation-of-reperfusion-arrhythmia
#6
Sebastian Koenig, Arash Arya, Gerhard Hindricks, Borislav Dinov
No abstract text is available yet for this article.
November 2016: HeartRhythm Case Reports
https://www.readbyqxmd.com/read/28488109/-epicardial-ablation-of-ventricular-tachycardias
#7
REVIEW
E Ene, P Halbfaß, K Nentwich, K Sonne, M Roos, S Fodor, L Lehmkuhl, F Gietzen, S Barth, K Hamm, T Deneke
Ventricular tachycardias (VT) in patients with structural heart diseases have predominantly a scar-associated reentry mechanism so that substrate-based ablation approaches also have to be used in nearly all procedures. In many VT cases-especially in nonischemic cardiomyopathy (NICM) and arrhythmogenic right ventricular cardiomyopathy-a critical epicardial substrate can be identified as an essential component of the reentry circuit so that for the ablation-based modification of the substrate in these cases an epicardial approach is necessary...
May 9, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28459967/survival-and-electrotransformation-of-pseudomonas-syringae-strains-under-simulated-cloud-like-conditions
#8
Laurine S Blanchard, Anaïs Monin, Hounaïda Ouertani, Lamia Touaibia, Elisa Michel, François Buret, Pascal Simonet, Cindy E Morris, Sandrine Demanèche
To diversify their genetic material, and thereby allow adaptation to environmental disturbances and colonization of new ecological niches, bacteria use various evolutionary processes, including the acquisition of new genetic material by horizontal transfer mechanisms such as conjugation, transduction and transformation. Electrotransformation mediated by lightning-related electrical phenomena may constitute an additional gene-transfer mechanism occurring in nature. The presence in clouds of bacteria such as Pseudomonas syringae capable of forming ice nuclei that lead to precipitation, and that are likely to be involved in triggering lightning, led us to postulate that natural electrotransformation in clouds may contribute to the adaptive potential of these bacteria...
May 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28442147/troubleshooter-in-electrical-storm-mechanical-unloading-leads-to-heart-rhythm-stabilization
#9
Johannes Mierke, Tobias Loehn, Christian Pfluecke, Karim Ibrahim
The electrical storm is a life-threatening situation which causes a complex antiarrhythmic treatment. We firstly report a rhythmological stabilization through mechanical unloading of the left ventricle in a health patient who developed electrical storm after endo- and epicardiac re-ablation and who previously underwent 27 unsuccessful defibrillations. No evidence for a specific etiology of the rhythm disturbances was found. After implantation of a percutaneous left ventricular assist device (pLVAD) a single additional defibrillation was needed to terminate ventricular fibrillation...
April 18, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28433561/catheter-ablation-for-acute-management-of-electrical-storm-in-icd-recipients-is-it-prime-time
#10
EDITORIAL
George K Andrikopoulos
No abstract text is available yet for this article.
April 19, 2017: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
https://www.readbyqxmd.com/read/28418593/nonparametric-tree-based-predictive-modeling-of-storm-outages-on-an-electric-distribution-network
#11
Jichao He, David W Wanik, Brian M Hartman, Emmanouil N Anagnostou, Marina Astitha, Maria E B Frediani
This article compares two nonparametric tree-based models, quantile regression forests (QRF) and Bayesian additive regression trees (BART), for predicting storm outages on an electric distribution network in Connecticut, USA. We evaluated point estimates and prediction intervals of outage predictions for both models using high-resolution weather, infrastructure, and land use data for 89 storm events (including hurricanes, blizzards, and thunderstorms). We found that spatially BART predicted more accurate point estimates than QRF...
March 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28400498/effect-of-thoracic-epidural-anesthesia-on-heart-rate-variability-in-a-porcine-model
#12
Arjun Mahajan, Tatsuo Takamiya, Peyman Benharash, Wei Zhou
Heart rate variability (HRV) is increasingly recognized as a means of evaluating autonomic tone. Thoracic epidural anesthesia (TEA) has been previously demonstrated to suppress the electrical storms in patients. However, the effect of TEA on HRV during sympathoexcitation remains unknown. In this study, we aimed to determine the effects of TEA on HRV response to left stellate ganglion stimulation (LSS) in a porcine model. In 12 anesthetized pigs after insertion of an epidural catheter to T1 level, a median sternotomy was performed to expose the heart and the left stellate ganglion...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28351142/assessing-the-source-to-stream-transport-of-benzotriazoles-during-rainfall-and-snowmelt-in-urban-and-agricultural-watersheds
#13
Abha Parajulee, Ying Duan Lei, Amila O De Silva, Xiaoshu Cao, Carl P J Mitchell, Frank Wania
While benzotriazoles (BTs) are ubiquitous in urban waters, their sources and transport remain poorly characterized. We aimed to elucidate the origin and hydrological pathways of BTs in Toronto, Canada, by quantifying three BTs, electrical conductivity, and δ(18)O in high-frequency streamwater samples taken during two rainfall and one snowmelt event in two watersheds with contrasting levels of urbanization. Average concentrations of total BTs (∑BT) were 1.3 to 110 times higher in the more urbanized Mimico Creek watershed relative to the primarily agricultural and suburban Little Rouge Creek...
April 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28339622/augmented-qrs-notching-and-macroscopic-t-wave-alternans-preceding-polymorphic-ventricular-tachycardia-in-a-patient-with-electrical-storm
#14
Shingo Minatoguchi, Nobuhiro Takasugi, Tomoki Kubota, Hiroaki Ushikoshi, Kazuhiko Nishigaki, Shinya Minatoguchi
No abstract text is available yet for this article.
February 17, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28314850/temporal-trends-and-temperature-related-incidence-of-electrical-storm-the-tempest-study-temperature-related-incidence-of-electrical-storm
#15
Federico Guerra, Paolo Bonelli, Marco Flori, Laura Cipolletta, Corrado Carbucicchio, Maite Izquierdo, Edward Kozluk, Kalyanam Shivkumar, Marmar Vaseghi, Francesca Patani, Claudio Cupido, Salvatore Pala, Ricardo Ruiz-Granell, Angel Ferrero, Claudio Tondo, Alessandro Capucci
BACKGROUND: The occurrence of ventricular tachyarrhythmias seems to follow circadian, daily, and seasonal distributions. Our aim is to identify potential temporal patterns of electrical storm (ES), in which a cluster of ventricular tachycardias or ventricular fibrillation, negatively affects short- and long-term survival. METHODS AND RESULTS: The TEMPEST study (Circannual Pattern and Temperature-Related Incidence of Electrical Storm) is a patient-level, pooled analysis of previously published data sets...
March 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28314846/circadian-and-weekly-patterns-of-electrical-storm-a-role-for-stress
#16
EDITORIAL
Eric J Berkowitz, Rachel Lampert
No abstract text is available yet for this article.
March 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28291121/extracorporeal-life-support-for-electrical-storm-or-for-cardiogenic-shock-with-ventricular-arrhythmia
#17
Corstiaan A den Uil
No abstract text is available yet for this article.
April 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28275618/extracorporeal-life-support-for-refractory-ventricular-tachycardia
#18
REVIEW
Sujatha P Bhandary, Nicholas Joseph, James P Hofmann, Theodosios Saranteas, Thomas J Papadimos
Extracorporeal life support (ECLS) is a very effective bridging therapy in patients with refractory ventricular tachycardia (VT) associated with cardiogenic shock. A moribund patient in extremis, is not amenable to optimization by standard ACC/AHA guidelines. New approaches and novel salvage techniques are necessary to improve outcomes in patients with refractory clinical settings such as malignant ventricular arrhythmias, cardiac arrest, cardiogenic shock and/or pulmonary failure until further management options are explored...
February 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28261825/electrical-storm-in-icd-recipients-with-arrhythmogenic-right-ventricular-cardiomyopathy
#19
Kang Yin, Ligang Ding, Wei Hua, Shu Zhang
BACKGROUND: Implantable cardioverter defibrillator (ICD) is the most important management for prevention of sudden cardiac death (SCD) in patients with arrhythmogenic right ventricular cardiomyopathy (ARVC). However, some patients may receive multiple ICD therapies in a short period, a condition referred as "electrical storm" (ES). OBJECTIVES: This study aimed to determine the prevalence, therapeutic options, and prognostic implications of ES in ARVC patients with an ICD...
March 6, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28238302/the-effects-of-pure-potassium-channel-blocker-nifekalant-and-sodium-channel-blocker-mexiletine-on-malignant-ventricular-tachyarrhythmias
#20
Sou Otuki, Kanae Hasegawa, Hiroshi Watanabe, Goro Katsuumi, Nobue Yagihara, Kenichi Iijima, Akinori Sato, Daisuke Izumi, Hiroshi Furushima, Masaomi Chinushi, Yoshifusa Aizawa, Tohru Minamino
BACKGROUND: Patients with repetitive ventricular tachyarrhythmias - so-called electrical storm - frequently require antiarrhythmic drugs. Amiodarone is widely used for the treatment of electrical storm but is ineffective in some patients. Therefore, we investigated the efficacy of stepwise administration of nifekalant, a pure potassium channel blocker, and mexiletine for electrical storm. METHODS: This study included 44 patients with repetitive ventricular tachyarrhythmias who received stepwise therapy with nifekalant and mexiletine for electrical storm...
May 2017: Journal of Electrocardiology
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