keyword
MENU ▼
Read by QxMD icon Read
search

ventricular ectopic

keyword
https://www.readbyqxmd.com/read/28570022/slow-antegrade-excitation-and-delayed-retrograde-activation-through-an-inexcitable-zone-a-basis-for-arrhythmia-formation-in-infarcted-myocardium-ex-vivo
#1
Eugene Patterson, Benjamin J Scherlag
INTRODUCTION: The electrophysiologic mechanism for rate-dependent PVBs associated with double potentials (DPs) was investigated in infarcted canine hearts using bipolar and intracellular microelectrode recordings. METHODS AND RESULTS: Dogs exhibiting rate-related ventricular ectopic beats (coupling interval, 390 ± 54 milliseconds) during sinus rhythm or atrial pacing were studied 4-5 days (N = 63) or 25 days (N = 16) following anterior descending coronary artery ligation...
June 1, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28538417/clinical-and-electrocardiographic-characteristics-of-infarctional-ventricular-ectopic-beats-an-observational-study
#2
Yuechun Li, Shi Zhe-Wei, Zheng Cheng, Chen Guang-Yi, Zhou De-Pu, Li Xiao-Wei, Guan Xueqiang, Lin Jiafeng, Chen Peng
The purpose of this study was to explore the clinical and electrocardiographic characteristics of infarctional ventricular ectopic beats (IVEBs).Thirty-eight acute myocardial infarction (AMI) patients with IVEB and 109 AMI patients without IVEB were analyzed. The morphological changes of QRS complex, ST segment, and T wave were compared to IVEB with sinus rhythm from the same period and fully evolved phase.An IVEB QRS complex often revealed the right bundle branch block morphology, in addition to Q wave AMI; no-Q wave AMI also had IVEB...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28525920/torsade-de-pointes-arrhythmias-arise-at-the-site-of-maximal-heterogeneity-of-repolarization-in-the-chronic-complete-atrioventricular-block-dog
#3
Albert Dunnink, Thom R G Stams, Alexandre Bossu, Veronique M F Meijborg, Jet D M Beekman, Sofieke C Wijers, Jacques M T De Bakker, Marc A Vos
Aims: The chronic complete atrioventricular block (CAVB) dog is highly sensitive for drug-induced torsade de pointes (TdP) arrhythmias. Focal mechanisms have been suggested as trigger for TdP onset; however, its exact mechanism remains unclear. In this study, detailed mapping of the ventricles was performed to assess intraventricular heterogeneity of repolarization in relation to the initiation of TdP. Methods and results: In 8 CAVB animals, 56 needles, each containing 4 electrodes, were inserted in the ventricles...
May 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28523323/discovery-of-a-new-mutation-in-the-desmin-gene-in-a-young-patient-with-cardiomyopathy-and-muscular-weakness
#4
Ruxandra Oana JurcuŢ, Alexandra Eugenia Bastian, Sebastian Militaru, Aura Popa, Emilia Manole, Bogdan Alexandru Popescu, Jonna Tallila, Bogdan Ovidiu Popescu, Carmen Doina Ginghină
A 25-year-old woman with a five years history of syncope, mild left ventricular hypertrophy and moderately enlarged atria, was diagnosed with third degree atrioventricular heart block alternating with atrioventricular heart block 2:1, and received a dual chamber pacemaker. After three years of evolution, she developed atrial fibrillation, marked biatrial enlargement, severely depressed longitudinal myocardial velocities, associated with mild girdle weakness and slight increase in creatine kinase level. The diagnosis of restrictive cardiomyopathy with mild skeletal myopathy imposed the screening for a common etiology...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28505705/crossed-ectopic-kidney-prenatal-diagnosis-and-postnatal-follow-up
#5
Michal Zajicek, Sharon Perlman, Benjamin Dekel, Einat Lahav, Danny Lotan, Dor Lotan, Reuven Achiron, Yinon Gilboa
OBJECTIVE: To investigate prenatal diagnosis and postnatal outcome of fetuses with crossed ectopic kidney METHODS: Cases referred for an empty renal fossa and diagnosed with crossed ectopic kidney confirmed postnatally were analyzed retrospectively over a period of 10 years. Prenatal diagnosis was established following the detection of one kidney in a normal position, and a second ipsilateral kidney fed by abnormal blood vessels on Doppler flow. RESULTS: Between 2005 and 2015, 185 fetuses were referred for an empty renal fossa...
May 15, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28500173/tgf-%C3%AE-1-transforming-growth-factor-%C3%AE-1-plays-a-pivotal-role-in-cardiac-myofibroblast-arrhythmogenicity
#6
Nicolò Salvarani, Ange Maguy, Stefano A De Simone, Michele Miragoli, Florian Jousset, Stephan Rohr
BACKGROUND: TGF-β1 (transforming growth factor-β1) importantly contributes to cardiac fibrosis by controlling differentiation, migration, and collagen secretion of cardiac myofibroblasts. It is still elusive, however, to which extent TGF-β1 alters the electrophysiological phenotype of myofibroblasts and cardiomyocytes and whether it affects proarrhythmic myofibroblast-cardiomyocyte crosstalk observed in vitro. METHODS AND RESULTS: Patch-clamp recordings of cultured neonatal rat ventricular myofibroblasts revealed that TGF-β1, applied for 24 to 48 hours at clinically relevant concentrations (≤2...
May 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28484840/epidemiology-of-ventricular-tachyarrhythmia-any-changes-in-the-past-decades
#7
REVIEW
Benjamin Jong-Ming Pang, Martin Stephen Green
Ventricular tachyarrhythmias include potentially lethal episodes of sustained ventricular tachycardia (VT) and ventricular fibrillation (VF) as well as hemodynamically tolerated ventricular ectopic activity. Sustained VT or VF may develop in the setting of acute myocardial infarction or as clinical sequelae of advanced cardiomyopathy. The incidence of these serious arrhythmias is estimated from retrospective and observational studies and registries of sudden cardiac arrest and sudden cardiac death. Over the past few decades, there has been a gradual decline in the incidence of life-threatening ventricular tachyarrhythmias which has been largely driven by upstream treatments for and prevention of coronary artery disease and its sequelae...
May 8, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28457241/development-of-tachyarrhythmias-late-after-the-fontan-procedure-the-role-of-ablative-therapy
#8
REVIEW
Natasja M S de Groot, Ad J J C Bogers
Patients with a Fontan circulation are at a high risk of developing a variety of cardiac dysrhythmias after cardiac surgery. These dysrhythmias are most often supraventricular tachyarrhythmias (SVT), but ventricular tachyarrhythmias (VT) may also occur. Mechanisms underlying SVT are variable, including both ectopic activity and reentry. Over time, successive SVT may be caused by different mechanisms. The acute success rate of ablative therapy of atrial tachyarrhythmias is considerably high yet during long-term follow-up 'recurrences' frequently occur...
June 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28431055/electrocardiographic-differentiation-of-idiopathic-right-ventricular-outflow-tract-ectopy-from-early-arrhythmogenic-right-ventricular-cardiomyopathy
#9
Jan Novak, Alessandro Zorzi, Silvia Castelletti, Antonis Pantasis, Ilaria Rigato, Domenico Corrado, William Mckenna, Pier D Lambiase
Aims: The differentiation between idiopathic right ventricular outflow tract (RVOT) arrhythmias and early arrhythmogenic right ventricular cardiomyopathy (ARVC) can be challenging. We aimed to assess whether QRS morphological features and coupling interval of ventricular ectopic beats (VEBs) can improve differentiation between the two conditions. Methods and Results: Twenty desmosomal-gene mutation carriers (13 females, mean age 43 years) with no or mild ARVC phenotypic expression and 33 age- and sex-matched subjects with idiopathic RVOT arrhythmias were studied...
April 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28421842/the-management-of-ventricular-dysrhythmia-in-aconite-poisoning
#10
REVIEW
James M Coulson, Thomas M Caparrotta, John P Thompson
INTRODUCTION: Aconite poisoning is relatively rare but is frequently complicated by ventricular dysrhythmias, which may be fatal. Molecular basis of aconite alkaloid ventricular arrhythmogenicity: Aconite exerts its toxic effects due to the presence of an admixture of alkaloids present in all parts of the plant. The major target of these aconite alkaloids is the fast voltage-gates sodium channel, where they cause persistent activation. This blockade of the channel in the activated state promotes automaticity within the ventricular myocardium and the generation of ventricular arrhythmias...
June 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28420707/role-of-the-fatty-acid-binding-protein-4-in-heart-failure-and-cardiovascular-disease
#11
Ricardo Rodriguez-Calvo, Josefa Girona, Josep M Alegret, Alba Bosquet, Daiana Ibarretxe, Lluís Masana
Obesity and ectopic fat accumulation in non-adipose tissues are major contributors to heart failure (HF) and cardiovascular disease (CVD). Adipocytes act as endocrine organs by releasing a large number of bioactive molecules into the bloodstream, which participate in a communication network between white adipose tissue and other organs, including the heart. Among these molecules, fatty acid binding protein 4 (FABP4) has been recently shown to increase cardiometabolic risk. Both clinical and experimental evidence have identified FABP4 as a relevant player in atherosclerosis and coronary artery disease, and it has been directly related to cardiac alterations such as left ventricular hypertrophy (LVH) or both systolic and diastolic cardiac dysfunction...
April 18, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28403078/renal-dysplasia-characterized-by-prominent-cartilaginous-metaplasia-lesions-in-vacterl-association-a-case-report
#12
Takeo Nakaya, Taiju Hyuga, Yukichi Tanaka, Shina Kawai, Hideo Nakai, Toshiro Niki, Akira Tanaka
BACKGROUND: Renal dysplasia is the most important cause of end-stage renal disease in children. The histopathological characteristic of dysplasia is primitive tubules with fibromuscular disorganization. Renal dysplasia often includes metaplastic cartilage. Metaplastic cartilage in renal dysplasia has been explained as occurring secondary to vesicoureteral reflux (VUR). Additionally, renal dysplasia is observed in renal dysplasia-associated syndromes, which are combinations of multiple developmental malformations and include VACTERL association...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28304253/ventricular-parasystole-in-a-neonatal-rhesus-macaque-macaca-mulatta
#13
Dalis E Collins, Brandy L Dozier, Jeffrey J Stanton, Lois Ma Colgin, Rhonda MacAllister
A 6-d-old Indian-origin female rhesus macaque (Macaca mulatta) presented with bradycardia shortly after sedation with ketamine. No other cardiac abnormalities were apparent. Approximately 2 wk after the initial presentation, the macaque was again bradycardic and exhibited a regularly irregular arrhythmia on a prestudy examination. ECG, echocardiography, blood pressure measurement, SpO2 assessment, and a CBC analysis were performed. The echocardiogram and bloodwork were normal, but the infant was hypotensive at the time of echocardiogram...
December 1, 2016: Comparative Medicine
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
#14
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 accelerated pacing (TAP)...
May 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28208963/clinical-profile-of-cardiac-arrhythmias-in-children-attending-the-out-patient-department-of-a-tertiary-paediatric-care-centre-in-chennai
#15
Sarala Premkumar, Premkumar Sundararajan, Thangavelu Sangaralingam
INTRODUCTION: The presentation of symptoms of paediatric arrhythmias vary depending on the age and underlying heart disease. Physical examination of children with important arrhythmias may be entirely normal. AIM: Aim is to study the characteristics of cardiac arrhythmias in paediatric patients in a tertiary paediatric care centre in Chennai, India. MATERIALS AND METHODS: The participants (n=60) were from birth to 12 years of age. Patients with sinus arrhythmias, sinus tachycardia and sinus bradycardia were excluded...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28198525/an-investigation-on-cardioprotective-potential-of-marrubium-vulgare-aqueous-fraction-against-ischemia-reperfusion-injury-in-isolated-rat-heart
#16
Alireza Garjani, Dena Tila, Sanaz Hamedeyazdan, Haleh Vaez, Maryam Rameshrad, Mahdiyeh Pashaii, Fatemeh Fathiazad
The aim of this study was to evaluate the cardioprotective effects of aqueous fraction of M. vulgare hydroalcoholic extract on cardiac parameters in ischemic-reperfused isolated rat hearts. The aerial parts of the plant were extracted with methanol 70% by maceration. The water-soluble portion of the total hydroalcoholic extract was prepared with liquid-liquid extraction (LLE). Afterwards, the antioxidant activity, total phenolic and flavonoids content of the aqueous fraction were determined. In order to evaluate the effects of the aqueous fraction on cardiac parameters and I/R injury, the Langendroff method was used on Male Wistar rats...
February 15, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/28191668/inflammatory-demyelination-induces-ependymal-modifications-concomitant-to-activation-of-adult-svz-stem-cell-proliferation
#17
Fereshteh Pourabdolhossein, Sara Gil-Perotín, Paula Garcia-Belda, Aurelien Dauphin, Sabah Mozafari, Vanja Tepavcevic, Jose Manuel Garcia Verdugo, Anne Baron-Van Evercooren
Ependymal cells (E1/E2) and ciliated B1cells confer a unique pinwheel architecture to the ventricular surface of the subventricular zone (SVZ), and their cilia act as sensors to ventricular changes during development and aging. While several studies showed that forebrain demyelination reactivates the SVZ triggering proliferation, ectopic migration, and oligodendrogenesis for myelin repair, the potential role of ciliated cells in this process was not investigated. Using conventional and lateral wall whole mount preparation immunohistochemistry in addition to electron microscopy in a forebrain-targeted model of experimental autoimmune encephalomyelitis (tEAE), we show an early decrease in numbers of pinwheels, B1 cells, and E2 cells...
February 13, 2017: Glia
https://www.readbyqxmd.com/read/28180102/concomitant-right-ventricular-outflow-tract-cryoablation-during-pulmonary-valve-replacement-in-a-patient-with-tetralogy-of-fallot
#18
Hong Ju Shin, Seunghwan Song, Yu Rim Shin, Han Ki Park, Young Hwan Park
A 38-year-old female patient with a history of tetralogy of Fallot repair at 10 years of age underwent pulmonary valve replacement with a mechanical prosthesis, tricuspid annuloplasty, and right ventricular outflow tract cryoablation due to pulmonary regurgitation, tricuspid regurgitation, and multiple premature ventricular contractions with sustained ventricular tachycardia. After surgery, she had an uneventful postoperative course with arrhythmia monitoring. She was discharged without incident, and a follow-up Holter examination showed a decrease in the number of ventricular ectopic beats from 702 to 41...
February 2017: Korean Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28177694/is-there-a-role-of-inducible-nitric-oxide-synthase-activation-in-the-delayed-antiarrhythmic-effect-of-sodium-nitrite
#19
Vivien Demeter-Haludka, László Juhász, Mária Kovác, János Gardi, Ágnes Végh
This study aimed to examine whether inducible nitric oxide synthase (iNOS) plays a role in the delayed antiarrhythmic effect of sodium nitrite. Twenty-one dogs were infused intravenously with sodium nitrite (0.2 μmol·kg(-1)·min(-1)) for 20 min, either in the absence (n = 12) or in the presence of the iNOS inhibitor S-(2-aminoethyl)-isothiourea (AEST) (total dose 2.0 mg·kg(-1) i.v., n = 9). Control dogs (n = 12) were given saline. Twenty-four hours later, all of the dogs were subjected to a 25 min period occlusion of the left anterior descending coronary artery followed by rapid reperfusion...
April 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28106124/effect-of-myocyte-fibroblast-coupling-on-the-onset-of-pathological-dynamics-in-a-model-of-ventricular-tissue
#20
S Sridhar, Nele Vandersickel, Alexander V Panfilov
Managing lethal cardiac arrhythmias is one of the biggest challenges in modern cardiology, and hence it is very important to understand the factors underlying such arrhythmias. While early afterdepolarizations (EAD) of cardiac cells is known to be one such arrhythmogenic factor, the mechanisms underlying the emergence of tissue level arrhythmias from cellular level EADs is not fully understood. Another known arrhythmogenic condition is fibrosis of cardiac tissue that occurs both due to aging and in many types of heart diseases...
January 20, 2017: Scientific Reports
keyword
keyword
92185
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"