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ventricle tachycardia

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https://www.readbyqxmd.com/read/29326832/at-the-atrioventricular-crossroads-dual-pathway-electrophysiology-in-the-atrioventricular-node-and-its-underlying-heterogeneities
#1
Sharon A George, N Rokhaya Faye, Alejandro Murillo-Berlioz, K Benjamin Lee, Gregory D Trachiotis, Igor R Efimov
The atrioventricular node (AVN) is a complex structure that performs a variety of functions in the heart. The AVN is primarily an electrical gatekeeper between the atria and ventricles and introduces a delay between atrial and ventricular excitation, allowing for efficient ventricular filling. The AVN is composed of several compartments that safely transmit electrical excitation from the atria to the ventricles via the fast or slow pathways. There are many electrophysiological differences between these pathways, including conduction time and electrical refractoriness, that increase the predisposition of the atrioventricular junction to arrhythmias such as atrioventricular nodal re-entrant tachycardia...
December 2017: Arrhythmia & Electrophysiology Review
https://www.readbyqxmd.com/read/29315941/thromboembolic-prophylaxis-protocol-with-warfarin-after-radiofrequency-catheter-ablation-of-infarct-related-ventricular-tachycardia
#2
Konstantinos C Siontis, Sina Jamé, Ghaith Sharaf Dabbagh, Rakesh Latchamsetty, Krit Jongnarangsin, Fred Morady, Frank M Bogun
INTRODUCTION: Ablation in the left ventricle (LV) is associated with a risk of thromboembolism. There are limited data on the use of specific thromboembolic prophylaxis strategies post-ablation. We aimed to evaluate a thromboembolic prophylaxis protocol after ventricular tachycardia (VT) ablation. METHODS AND RESULTS: The index procedures of 217 patients undergoing ablation for infarct-related VT with open irrigated-tip catheters were included. Patients with large LV endocardial ablation area (> 3 cm between ablation lesions) were started on low-dose, slowly escalating unfractionated heparin (UFH) infusion 8 hours after access hemostasis, followed by 3 months of anticoagulation...
January 9, 2018: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29315657/dysautonomy-in-different-death-risk-groups-rassi-score-in-patients-with-chagas-heart-disease
#3
Catherine Masiel Merejo Peña, Michel Silva Reis, Basílio de Bragança Pereira, Emília Matos do Nascimento, Roberto Coury Pedrosa
BACKGROUND: It has been difficult to prove that the "catecholamine-induced cardiomyopathy" contributes to the mechanism of sudden cardiac death in Chagas heart disease. Also, it is almost impossible to rule out the possibility that is not involved in the process. More importantly, the vagal-cholinergic pathway in the ventricle plays a direct role in the prevention of the initiation of complex ventricular arrhythmias, including non-sustained ventricular tachycardia, ventricular fibrillation responsible for sudden death...
January 5, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29315367/sudden-death-in-patients-with-ebstein-anomaly
#4
Christine H Attenhofer Jost, Nicholas Y Tan, Abdalla Hassan, Emily R Vargas, David O Hodge, Joseph A Dearani, Heidi Connolly, Samuel J Asirvatham, Christopher J McLeod
Aims: Ventricular dysfunction or structural alteration of either ventricle is a well-established risk factor for sudden death (SD). Ebstein anomaly (EA) can present with both right and left heart abnormalities; however, predictors of SD have not been described. We therefore sought to characterize the incidence and risk factors of SD among a large cohort of patients with EA. Methods and results: All EA patients who underwent evaluation at a high-volume institution over a 4-decade period were retrospectively reviewed...
January 5, 2018: European Heart Journal
https://www.readbyqxmd.com/read/29312717/predictors-of-ventricular-tachyarrhythmia-occurring-late-after-intracardiac-repair-of-tetralogy-of-fallot-combination-of-qrs-duration-change-rate-and-tricuspid-regurgitation-pressure-gradient
#5
Shuichi Shiraishi, Masashi Takahashi, Ai Sugimoto, Masanori Tsuchida
Background: To determine potential predictors of ventricular tachyarrhythmia and sudden cardiac death (SCD) occurring late after repair of tetralogy of Fallot (TOF). Methods: Since 1964, 415 patients had undergone total repair for TOF at Niigata University Hospital. Of these, 89 patients who were followed for more than 10 years at our institute were retrospectively reviewed. Results: The mean follow-up period was 24.3 years. During the study period, one patient died of cerebral bleeding, and two patients had SCD...
December 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29250225/atrial-fibrillation-in-patients-with-congenital-heart-disease
#6
REVIEW
Tabitha G Moe, Victor A Abrich, Edward K Rhee
Advances in surgical techniques have led to the survival of most patients with congenital heart disease (CHD) up to their adulthood. During their lifetime, many of them develop atrial tachyarrhythmias due to atrial dilatation and scarring from surgical procedures. More complex defects and palliative repairs are linked to a higher incidence and earlier occurrence of arrhythmias. Atrial fibrillation (AF) is common in patients who have atrial septal defects repaired after age 55 and in patients with tetralogy of Fallot repaired after age 45...
June 2017: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/29246830/relative-timing-of-near-field-and-far-field-electrograms-can-determine-tachyarrhythmia-site-of-origin
#7
Jane Caldwell, Lorne Gula, Fariha Sadiq Ali, Rodrigo I Miranda, Hoshiar Abdollah, Adrian Baranchuk, Kevin Michael, Christopher Simpson, Damian P Redfearn
BACKGROUND: Despite improving algorithms, inappropriate shocks for supraventricular arrhythmias (SVT) still occur in a significant number of patients with implantable cardioverter defibrillators (ICD). This makes the discovery of novel discriminators that use existing ICD hardware, an attractive proposition. OBJECTIVE: We hypothesised that the delay of activation onset from the device detected, far field electrogram(EGM) to the near field, bipole EGM would allow differentiation of ventricular tachycardias (VT) from SVTs...
December 12, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29245138/cardiac-sarcoidosis-presenting-as-arrhythmogenic-right-ventricular-cardiomyopathy-dysplasia-with-ventricular-aneurysms-a-case-report
#8
Marija Petrovic, L Maximilian Buja, Biswajit Kar, Jure Colnaric, Sarita Damaraju, Bihong Zhao, Bindu Akkanti, Milan Radovanovic, Rajko Radovancevic, Pranav Loyalka, Igor D Gregoric
A 70-year old Caucasian man with recurrent ventricular tachycardia and progressive biventricular failure attributed to arrhythmogenic right ventricular cardiomyopathy/dysplasia was evaluated for heart transplantation. Cardiac ventriculography revealed an abnormal left ventricle with five saccular aneurysms. Heart transplantation was performed. Pathology of the explanted heart showed multifocal sarcoid granulomas. Replacement fibrosis was widespread in both ventricles and associated with saccular aneurysms. No genetic basis was identified...
November 10, 2017: Cardiovascular Pathology: the Official Journal of the Society for Cardiovascular Pathology
https://www.readbyqxmd.com/read/29216239/effects-of-early-afterdepolarizations-on-excitation-patterns-in-an-accurate-model-of-the-human-ventricles
#9
Enid Van Nieuwenhuyse, Gunnar Seemann, Alexander V Panfilov, Nele Vandersickel
Early Afterdepolarizations, EADs, are defined as the reversal of the action potential before completion of the repolarization phase, which can result in ectopic beats. However, the series of mechanisms of EADs leading to these ectopic beats and related cardiac arrhythmias are not well understood. Therefore, we aimed to investigate the influence of this single cell behavior on the whole heart level. For this study we used a modified version of the Ten Tusscher-Panfilov model of human ventricular cells (TP06) which we implemented in a 3D ventricle model including realistic fiber orientations...
2017: PloS One
https://www.readbyqxmd.com/read/29208596/urinary-8-hydroxy-2-deoxyguanosine-as-a-myocardial-oxidative-stress-marker-is-associated-with-ventricular-tachycardia-in-patients-with-active-cardiac-sarcoidosis
#10
Hironori Ishiguchi, Shigeki Kobayashi, Takeki Myoren, Michiaki Kohno, Takuma Nanno, Wakako Murakami, Seiko Oda, Keishi Oishi, Shinichi Okuda, Munemasa Okada, Kazuyoshi Suga, Masafumi Yano
BACKGROUND: Recently, we reported that urinary 8-hydroxy-2'-deoxyguanosine (U-8-OHdG), an oxidative stress marker, reflected inflammatory activity in cardiac sarcoidosis (CS). Here, we investigated whether U-8-OHdG levels were associated with ventricular tachycardia (VT) in patients with CS. METHODS AND RESULTS: This prospective cohort study enrolled 62 consecutive patients with CS, of whom 36 were diagnosed as having active CS based on abnormal 18F-flurodeoxyglucose accumulation in the heart on positron-emission tomography/computed tomography...
December 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29188428/surgical-treatment-for-endocardial-radiofrequency-ablation-resistant-sustained-monomorphic-ventricular-tachycardia-with-mural-thrombus-including-dense-calcification-in-the-left-ventricle
#11
Takuya Higuchi, Yasushi Tsutsumi, Osamu Monta, Satoshi Asada, Ryota Matsumoto, Shouhei Yamada, Hirokazu Ohashi
Catheter ablation provides effective results for sustained monomorphic ventricular tachycardia (VT), but the presence of mural thrombus including dense calcification occasionally causes unfavorable outcomes. The case of a 67-year-old man in whom sustained monomorphic VT, which was resistant to endocardial radiofrequency ablation, in the presence of mural thrombus including dense calcification after coronary artery bypass grafting was successfully treated by left ventricular reconstruction with cryoablation is reported...
November 29, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29183028/radiofrequency-ablation-of-atrial-fibrillation-in-patients-with-ebstein-s-anomaly-a-two-case-report
#12
Konstantinos E Iliodromitis, Marc Bonsels, Rolf Borchard, Anja Dorszewski
Ebstein's anomaly (EA) is a rare congenital heart disease characterized by "atrialization" of the right ventricle, due to apical displacement of the tricuspid leaflets into the right ventricle. Patients with EA may develop all kinds of supraventricular arrhythmias requiring radiofrequency ablation. Atrial fibrillation (Afib) is a common arrhythmia in EA patients, and results in debilitating symptoms that often require surgical treatment. This is a follow-up report of 2 patients with EA undergoing radiofrequency ablation for Afib...
November 29, 2017: Cardiology
https://www.readbyqxmd.com/read/29169754/chronic-lower-dose-relaxin-administration-protects-from-arrhythmia-in-experimental-myocardial-infarction-due-to-anti-inflammatory-and-anti-fibrotic-properties
#13
Thomas Beiert, Vincent Knappe, Vedat Tiyerili, Florian Stöckigt, Verena Effelsberg, Markus Linhart, Martin Steinmetz, Sabine Klein, Robert Schierwagen, Jonel Trebicka, Wilhelm Roell, Georg Nickenig, Jan W Schrickel, René P Andrié
BACKGROUND: The peptide hormone relaxin-2 (RLX) exerts beneficial effects during myocardial ischemia, but functional data on lower-dose RLX in myocardial infarction (MI) is lacking. Therefore, we investigated the impact of 75μg/kg/d RLX treatment on electrical vulnerability and left ventricular function in a mouse model of MI. METHODS AND RESULTS: Standardized cryoinfarction of the left anterior ventricular wall was performed in mice. A two week treatment period with vehicle or RLX via subcutaneously implanted osmotic minipumps was started immediately after MI...
January 1, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29150491/hypothermia-modulates-arrhythmia-substrates-during-different-phases-of-resuscitation-from-ischemic-cardiac-arrest
#14
Joseph S Piktel, Aurelia Cheng, Matthew McCauley, Zack Dale, Michelle Nassal, Danielle Maleski, Gary Pawlowski, Kenneth R Laurita, Lance D Wilson
BACKGROUND: We designed an innovative porcine model of ischemia-induced arrest to determine dynamic arrhythmia substrates during focal infarct, global ischemia from ventricular tachycardia or fibrillation (VT/VF) and then reperfusion to determine the effect of therapeutic hypothermia (TH) on dynamic arrhythmia substrates and resuscitation outcomes. METHODS AND RESULTS: Anesthetized adult pigs underwent thoracotomy and regional plunge electrode placement in the left ventricle...
November 17, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29147786/risk-factors-for-development-of-ectopic-atrial-tachycardia-in-post-operative-congenital-heart-disease
#15
Bradley C Clark, John T Berger, Charles I Berul, Richard A Jonas, Jonathan R Kaltman, Julianne Lapsa, Dilip S Nath, Elizabeth D Sherwin, Pranava Sinha, David Zurakowski, Jeffrey P Moak
Ectopic atrial tachycardia (EAT) is common in surgically repaired congenital heart disease (CHD) and carries the potential for significant hemodynamic compromise. Our objective was to determine the incidence, and risk factors of EAT after CHD surgery. Prospective study of patients that underwent surgery for CHD from February to October 2016 was performed. Demographic, perioperative and electrophysiologic data were collected. Sustained EAT (> 30 s) was documented by telemetry or electrocardiogram and confirmed by a pediatric electrophysiologist...
November 17, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29137910/tamponade-hemodynamic-and-echocardiographic-diagnosis
#16
REVIEW
Mark J Kearns, Keith R Walley
Cardiac tamponade is a medical emergency that can be readily reversed with timely recognition and appropriate intervention. The clinical diagnosis of cardiac tamponade requires synthesis of a constellation of otherwise non-specific features, based on an understanding of the underlying pathophysiology. Whereas echocardiographic examination is a central component of diagnosis, alone it is insufficient to establish the physiologic diagnosis of hemodynamically significant cardiac tamponade. The hemodynamic diagnosis of cardiac tamponade requires clinical evidence of low cardiac output and stroke volume in the setting of elevated cardiac filling pressures, with evidence of increased sympathetic tone (tachycardia, peripheral vasoconstriction, etc), and exclusion of other causes of shock as the primary problem (particularly cardiogenic shock)...
November 11, 2017: Chest
https://www.readbyqxmd.com/read/29127709/pulmonary-damage-following-right-ventricular-outflow-tachycardia-ablation-in-a-child-when-electroanatomical-mapping-isn-t-good-enough
#17
Neha Bansal, Daisuke Kobayashi, Peter P Karpawich
A 14-year-old female was referred for severe pulmonary valve insufficiency after undergoing radiofrequency ablation for a right ventricular outflow tract tachycardia that originated in the proximal pulmonary artery at 10 years of age. Clinical records indicated that ablation was guided solely by electrograms and electroanatomical mapping. Due to myocardial tissue extensions, mapping failed to identify the level of the pulmonary valve annulus, which resulted in delivery of energy on the valve proper and into the pulmonary artery...
November 11, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29113751/cardiomyopathy-induced-by-incessant-ventricular-tachycardia-originating-in-the-vicinity-of-the-his-bundle
#18
Sana Ouali, Manel Ben Halima, Selim Boudiche, Anissa Gharbi, Khedher Nadim, Kaouthar Hakim, Fatma Ouarda, Mohamed Sami Mourali
A 04-year-old boy was referred to our institution with severe, progressive heart failure of 4-months duration associated with a persistent wide QRS tachycardia with left bundle branch block and severe left ventricular dysfunction. Because of incessant wide QRS tachycardia refractory to antiarrhythmic drugs, he was referred for electrophysiological study. The ECG was suggestive of VT arising from the right ventricle near the His area. Electrophysiological study revealed that origin of tachycardia was septum of the right ventricle, near His bundle, however the procedure was not successful and an inadvertent complete atrioventricular conduction block occurred...
November 4, 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29101288/increased-cardiac-arrhythmogenesis-associated-with-gap-junction-remodeling-with-upregulation-of-rna-binding-protein-fxr1
#19
Miensheng Chu, Stefanie Mares Novak, Cathleen Cover, Anne A Wang, Ikeotunye Royal Chinyere, Elizabeth Juneman, Daniela C Zarnescu, Pak Kin Wong, Carol Gregorio
Background -Gap junction remodeling is well established as a consistent feature of human heart disease involving spontaneous ventricular arrhythmia. The mechanisms responsible for gap junction remodeling that include alterations in the distribution of, and protein expression within, gap junctions are still debated. Studies reveal that multiple transcriptional and post-transcriptional regulatory pathways are triggered in response to cardiac disease, such as those involving RNA-binding proteins. The expression levels of Fragile X mental retardation autosomal homolog 1 (FXR1), an RNA-binding protein, are critical to maintain proper cardiac muscle function; however, the connection between FXR1 and disease is not clear...
November 3, 2017: Circulation
https://www.readbyqxmd.com/read/29093566/hypertension-induces-additional-cardiometabolic-impairments-and-attenuates-aerobic-exercise-training-adaptations-in-fructose-fed-ovariectomized-rats
#20
Janaina de O Brito-Monzani, Iris Callado Sanches, Nathalia Bernardes, Kátia Ponciano, Ivana C Moraes-Silva, Maria-Cláudia Irigoyen, Susana Llesuy, Kátia De Angelis
We tested whether hypertension favors the development of additional cardiometabolic changes in fructose-fed ovariectomized rats and how it affects aerobic exercise training (ET) effects. All rats received fructose in drinking water (10%) beginning at weaning, were ovariectomized at 10 weeks of age and divided into the normotensive sedentary (NFOS) and trained (NFOT) and hypertensive sedentary (HFOS) and trained (HFOT) groups. ET was performed on a treadmill. Arterial pressure (AP) was directly recorded; heart rate and AP variabilities were analyzed...
November 2, 2017: Hypertension Research: Official Journal of the Japanese Society of Hypertension
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