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https://www.readbyqxmd.com/read/29237516/utility-of-cardiac-mri-in-paediatric-myocarditis
#1
Alice Hales-Kharazmi, Nina Hirsch, Michael Kelleman, Timothy Slesnick, Shriprasad R Deshpande
BACKGROUND: The diagnostic role of cardiac MRI in myocarditis is evolving, however with extremely limited data in paediatrics. The goal of this study was to assess the utility of cardiac MRI in paediatric myocarditis and present a new prognostic score for risk stratification. METHOD: The present study is a retrospective investigation of children with a clinical diagnosis of myocarditis, including analysis of demographics, clinical presentation, diagnostic studies, including cardiac MRI, and outcomes...
December 14, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/29229215/atrial-fibrillation-neurogenic-or-myogenic
#2
REVIEW
Alina Scridon, Răzvan Constantin Şerban, Philippe Chevalier
A 55-year-old hypertensive patient presents atrial fibrillation after vasovagal syncope. Non-invasive cardiac workup is normal. Without antiarrhythmic therapy, the patient has no recurrence for the next 3years, then presents with a stroke. Echocardiography eventually reveals left atrial dilation. This sequence of events illustrates the well-known links between age, arterial hypertension, atrial fibrillation, atrial neuromyopathy and stroke. A frequently neglected common denominator in this equation is impaired sympathovagal balance...
December 8, 2017: Archives of Cardiovascular Diseases
https://www.readbyqxmd.com/read/29225010/initiation-and-outcomes-with-class-ic-antiarrhythmic-drug-therapy
#3
Xu Gao, Avirup Guha, Benjamin Buck, Dilesh Patel, Melissa J Snider, Michael Boyd, Muhammad Afzal, Auroa Badin, Hemant Godara, Zhenguo Liu, Jaret Tyler, Raul Weiss, Steven Kalbfleisch, John Hummel, Ralph Augostini, Mahmoud Houmsse, Emile G Daoud
BACKGROUND: Expert opinion recommends performing exercise testing with initiation of Class Ic antiarrhythmic medication. OBJECTIVE: To evaluate the rate and reason for discontinuation of Ic agent within the first year of follow up, with particular attention to rate of proarrhythmia and the value of routine treadmill testing. METHODS: This is a single center retrospective cohort study including consecutive patients with atrial arrhythmias who were initiated on a Class Ic agent from 2011 to 2016...
December 7, 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29224709/prevalence-and-prognostic-significance-of-nonsustained-ventricular-tachycardia-in-patients-with-a-left-ventricular-ejection-fraction-from-35-to-50
#4
Sorcha M Allen, Victor A Abrich, Paul S Bibby, Daniel Fishman, Win-Kuang Shen, Dan Sorajja
The risk of life-threatening ventricular arrhythmias in patients with mild-to-moderately reduced left ventricular ejection fraction (LVEF) is unknown. This retrospective case-control study aims to identify the prevalence, risk factors, and outcomes associated with the development of nonsustained ventricular tachycardia (NSVT) as documented on permanent pacemakers or implantable loop recorders in tertiary care center patients with an LVEF of 35% to 50%. Data pertaining to patient demographics, previous medical history, heart failure functional class, echocardiographic parameters, and survival were compared between the groups...
October 31, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/29221681/hypercalcemic-crisis-and-primary-hyperparathyroidism-cause-of-an-unusual-electrical-storm
#5
Tatiana Guimarães, Miguel Nobre Menezes, Diogo Cruz, Sónia do Vale, Armando Bordalo, Arminda Veiga, Fausto J Pinto, Dulce Brito
Hypercalcemia is a known cause of heart rhythm disorders, however its association with ventricular arrhythmias is rare. The authors present a case of a fifty-three years old male patient with a ischemic and ethanolic dilated cardiomyopathy, and severely reduced ejection fraction, carrier of cardiac resynchronization therapy (CRT) with cardioverter defibrillator (ICD), admitted in the emergency department with an electrical storm, with multiple appropriated ICD shocks, refractory to antiarrhythmic therapy. In the etiological investigation was documented severe hypercalcemia secondary to primary hyperparathyroidism undiagnosed until then...
December 5, 2017: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29221440/effect-of-flecainide-on-atrial-fibrillatory-rate-in-a-large-animal-model-with-induced-atrial-fibrillation
#6
Eva Z Hesselkilde, Helena Carstensen, Maria M Haugaard, Jonas Carlson, Steen Pehrson, Thomas Jespersen, Rikke Buhl, Pyotr G Platonov
BACKGROUND: Atrial fibrillatory cycle length has been considered one of the indices of atrial electrical remodelling during atrial fibrillation (AF), which can be assessed from surface ECG by computer-assisted calculation of atrial fibrillatory rate (AFR). Horses have been suggested as a bona fide model for AF studies since horses too, develop lone AF, however data on AF characteristics in horses are extremely sparse and non-invasive characterization of AF complexity using surface ECG processing has not been reported...
December 8, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/29218248/propafenone-suppresses-esophageal-cancer-proliferation-through-inducing-mitochondrial-dysfunction
#7
Wei-Bin Zheng, Yang-Jia Li, Yang Wang, Jie Yang, Can-Can Zheng, Xiao-Hui Huang, Bin Li, Qing-Yu He
Esophageal squamous cell carcinoma (ESCC) is one of the most common malignant tumors with poor survival and limited therapeutic options. The aim of this study is to identify novel anticancer strategies from existing Food and Drug Administration (FDA)-approved drugs that have been used to clinically treat other diseases. Here, propafenone, an antiarrhythmic medication, was found to induce apoptosis and exert a significantly inhibitory effect on the proliferation and colony-forming ability of ESCC cells in a dose-dependent manner without observed cytotoxicity on normal esophageal epithelial cells...
2017: American Journal of Cancer Research
https://www.readbyqxmd.com/read/29218016/synergistic-anti-arrhythmic-effects-in-human-atria-with-combined-use-of-sodium-blockers-and-acacetin
#8
Haibo Ni, Dominic G Whittaker, Wei Wang, Wayne R Giles, Sanjiv M Narayan, Henggui Zhang
Atrial fibrillation (AF) is the most common cardiac arrhythmia. Developing effective and safe anti-AF drugs remains an unmet challenge. Simultaneous block of both atrial-specific ultra-rapid delayed rectifier potassium (K+) current (IKur) and the Na+ current (INa) has been hypothesized to be anti-AF, without inducing significant QT prolongation and ventricular side effects. However, the antiarrhythmic advantage of simultaneously blocking these two channels vs. individual block in the setting of AF-induced electrical remodeling remains to be documented...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29216988/catheter-ablation-of-ventricular-tachycardia-in-structural-heart-disease-indications-strategies-and-outcomes-part-ii
#9
REVIEW
Srinivas R Dukkipati, Jacob S Koruth, Subbarao Choudry, Marc A Miller, William Whang, Vivek Y Reddy
In contrast to ventricular tachycardia (VT) that occurs in the setting of a structurally normal heart, VT that occurs in patients with structural heart disease carries an elevated risk for sudden cardiac death (SCD), and implantable cardioverter-defibrillators (ICDs) are the mainstay of therapy. In these individuals, catheter ablation may be used as adjunctive therapy to treat or prevent repetitive ICD therapies when antiarrhythmic drugs are ineffective or not desired. However, certain patients with frequent premature ventricular contractions (PVCs) or VT and tachycardiomyopathy should be considered for ablation before ICD implantation because left ventricular function may improve, consequently decreasing the risk of SCD and obviating the need for an ICD...
December 12, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29213224/pro-arrhythmogenic-effects-of-the-v141m-kcnq1-mutation-in-short-qt-syndrome-and-its-potential-therapeutic-targets-insights-from-modeling
#10
Hsiang-Chun Lee, Yoram Rudy, Hongwu Liang, Chih-Chieh Chen, Ching-Hsing Luo, Sheng-Hsiung Sheu, Jianmin Cui
Gain-of-function mutations in the pore-forming subunit of IKs channels, KCNQ1, lead to short QT syndrome (SQTS) and lethal arrhythmias. However, how mutant IKs channels cause SQTS and the possibility of IKs-specific pharmacological treatment remain unclear. V141M KCNQ1 is a SQTS associated mutation. We studied its effect on IKs gating properties and changes in the action potentials (AP) of human ventricular myocytes. Xenopus oocytes were used to study the gating mechanisms of expressed V141M KCNQ1/KCNE1 channels...
October 2017: Journal of Medical and Biological Engineering
https://www.readbyqxmd.com/read/29211857/pulmonary-vein-isolation-with-vs-without-continued-antiarrhythmic-drug-treatment-in-subjects-with-recurrent-atrial-fibrillation-powder-af-results-from-a-multicentre-randomized-trial
#11
Mattias Duytschaever, Anthony Demolder, Thomas Phlips, Andrea Sarkozy, Milad El Haddad, Philippe Taghji, Sebastien Knecht, Rene Tavernier, Yves Vandekerckhove, Tom De Potter
Aims: Catheter ablation is indicated in patients with symptomatic paroxysmal atrial fibrillation (AF) resistant to antiarrhythmic drug therapy (ADT). We investigated whether continued use of previously ineffective ADT beyond the post-ablation blanking period reduces recurrence of atrial tachyarrhythmia within the 1st year after ablation. Methods and results: This was a multicentre, randomized controlled study in patients undergoing contact force-guided pulmonary vein isolation (PVI) for paroxysmal AF in whom previously ineffective ADT was continued during a blanking period of 3 months...
December 2, 2017: European Heart Journal
https://www.readbyqxmd.com/read/29208503/maternal-complications-induced-by-digoxin-treatment-of-fetal-tachycardia-a-retrospective-series-of-18-cases
#12
S Moatassim, S Touleimat, T Hazelzet, M-D Brasseur, A Diguet, I Durand, E Verspyck
OBJECTIVE: To evaluate maternal tolerance to digoxin, used alone or associated to other antiarrhythmic drugs in the management of fetal tachycardia. PATIENTS AND METHODS: This retrospective study was conducted at Rouen University Hospital between January 2009 and July 2016. All women who have received a treatment by either digoxin alone or associated with another antiarrhythmic drug for fetal tachycardia were included in the study. Maternal cardiac and extracardiac adverse effects were reported and comparisons between electrocardiograms before and during treatment with digoxin alone were performed...
December 2, 2017: Journal of Gynecology Obstetrics and Human Reproduction
https://www.readbyqxmd.com/read/29205672/repetitive-incessant-electrical-storm-triggered-by-early-repolarization
#13
Sofia Chatzidou, Evangelos Repasos, Sotiris Plastiras, Christos Kontogiannis, Marinos Kosmopoulos, Diamantis I Tsilimigras, Ioannis Paraskevaidis, Stelios Rokas
Early repolarization syndrome (ERS) was originally considered a normal variant with benign outcome. However, recent studies have demonstrated that it can be linked to a considerable risk of life-threatening arrhythmias and sudden cardiac death. We report a case with an extraordinary, extremely malignant clinical expression of ERS refractory to all antiarrhythmic drugs including quinidine. This case demonstrates real-time changes of dynamic electrocardiogram (ECG) preceding a polymorphic ventricular tachycardia (VT)-ventricular fibrillation (VF) and possible external factors triggering arrhythmia onset...
December 5, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29205499/retrospective-evaluation-of-the-effect-of-heart-rate-on-survival-in-dogs-with-atrial-fibrillation
#14
B Pedro, J Dukes-McEwan, M A Oyama, M S Kraus, A R Gelzer
BACKGROUND: Atrial fibrillation (AF) usually is associated with a rapid ventricular rate. The optimal heart rate (HR) during AF is unknown. HYPOTHESIS/OBJECTIVES: Heart rate affects survival in dogs with chronic AF. ANIMALS: Forty-six dogs with AF and 24-hour ambulatory recordings were evaluated. METHODS: Retrospective study. Holter-derived HR variables were analyzed as follows: mean HR (meanHR, 24-hour average), minimum HR (minHR, 1-minute average), maximum HR (maxHR, 1-minute average)...
December 4, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/29200088/totally-thoracoscopic-pulmonary-vein-isolation-a-simplified-technique
#15
Meelad I H Al-Jazairi, Theo J Klinkenberg, Bart P Van Putte, Massimo A Mariani, Stefano Benussi
Since the introduction of thoracoscopic ablation for atrial fibrillation (AF), the field of minimally invasive AF treatment has evolved toward an established treatment option for AF, with an overall 2-year antiarrhythmic drug free success rate of 77%. Complications are usually minor, and the incidence of bleeding needing conversion to sternotomy or (mini-)thoracotomy varies between 0% and 1.6%. Bleeding is often related to encircling the pulmonary veins, which is a blind maneuver that has to be done without direct camera vision...
December 1, 2017: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/29198533/usefulness-of-routine-transtelephonic-monitoring-for-supraventricular-tachycardia-in-infants
#16
Jonathan Yaari, Dorota Gruber, Andrew D Blaufox
OBJECTIVE: We hypothesize that routine daily transtelephonic monitoring (TTM) transmissions can accurately detect supraventricular tachycardia (SVT) in asymptomatic infants and/or assuage parental concerns rather than being used solely to diagnose arrhythmias. STUDY DESIGN: Single center, retrospective chart review of 60 patients with fetal or infant SVT prescribed TTM for at least 30 days, January 2010-September 2016. Patients were excluded if initial SVT was not documented, was perioperative, was atrial flutter/fibrillation, or chaotic atrial tachycardia...
November 30, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/29194862/a-case-report-is-mexiletine-usage-effective-in-the-shortening-of-qtc-interval-and-improving-the-t-wave-alternans-in-timothy-syndrome
#17
Gulhan Tunca Sahin, Yakup Ergul
Timothy syndrome (TS) is a multisystemic disease that occurs because of a mutation in CACN1C gene and is characterized by prolonged QT interval. Mexiletine is a Class 1B antiarrhythmic drug that causes the disappearance of T-wave alternans by shortening QTc and peak-to-end of the T wave. It may block the development of torsades de pointes in a prolonged QT. This study presented the case of a patient diagnosed with TS and had a cardiac arrest history, prolonged QT, and T-wave alternans. After mexiletine treatment, the QTc interval shortened and T-wave alternans disappeared...
November 30, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29192590/catheter-ablation-in-the-treatment-of-electrical-storm-integrative-review
#18
REVIEW
Ricardo Teixeira Leal, Gabriel Costa Monteiro, Antônio da Silva Menezes Júnior
BACKGROUND: The incidence of electrical storm (ES) has been increasing with the rise of the indicated uses of implantable cardioverter defibrillators (ICDs). It is estimated that 20% of patients will evolve to have this complication. Ablative therapy stands out as the treatment for this condition when it is refractory to antiarrhythmic treatment. The objective was to define the current role of catheter ablation in the treatment of electrical storm. METHODS: An integrative literature review was performed using the PubMed and BVS databases...
September 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29191406/enantioselective-separation-of-racemates-using-chiralpak-ig-amylose-based-chiral-stationary-phase-under-normal-standard-non-standard-and-reversed-phase-high-performance-liquid-chromatography
#19
Ashraf Ghanem, Chexu Wang
We have previously reported on the solvent versatility of immobilized amylose and cellulose-based chiral stationary phases in enantioselective liquid chromatographic separation of racemates. The studies were mainly focusing on the tris substituted 3,5-dimethylphenylcarbamate polysaccharide-based chiral stationary phases namely CHIRALPAK IA® [Amylose tris (3,5-dimethylphenylcarbamate)] or ADMPC and CHIRALPAK IB® [Cellulose tris (3,5-dimethylphenylcarbamate)] or CDMPC. Here we focus on the application of the recently introduced amylose tris (3-chloro-5-methylphenylcarbamate) or ACMPC and brand name CHIRALPAK IG® with a chlorine substituent replacing the methyl group in CHIRALPAK IA®...
November 24, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29186419/management-of-ventricular-tachycardia-in-the-ablation-era-results-of-the-european-heart-rhythm-association-survey
#20
Roland Richard Tilz, Radoslaw Lenarczyk, Daniel Scherr, Kristina Herman Haugaa, Konstantinos Iliodromitis, Helmut Pürerfellner, Marek Kiliszek, Nikolaos Dagres
Patients with sustained ventricular tachycardia (VT) are at risk of sudden death. Treatment options for VT include antiarrhythmic drug therapy, insertion of an implantable cardioverter-defibrillator, and catheter ablation. Evidence on indications for VT ablation, timing, ablation strategies, and periprocedural management is sparse. The aim of this European Heart Rhythm Association (EHRA) survey was to evaluate clinical practice regarding management of VT among the European countries. An electronic questionnaire was sent to members of the EHRA Electrophysiology Research Network...
November 23, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
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