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Atrial tachycardia

Juanita Hunter, Emmanouil Tsounias, John Cogan, Ming-Lon Young
BACKGROUND Lown-Ganong-Levine syndrome, includes a short PR interval, normal QRS complex, and paroxysmal tachycardia. The pathophysiology of this syndrome includes an accessory pathway connecting the atria and the atrioventricular (AV) node (James fiber), or between the atria and the His bundle (Brechenmacher fiber). Similar features are seen in enhanced atrioventricular nodal conduction (EAVNC), with the underlying pathophysiology due to a fast pathway to the AV node, and with the diagnosis requiring specific electrophysiologic criteria...
March 18, 2018: American Journal of Case Reports
Natalia A Trayanova, Patrick M Boyle, Plamen P Nikolov
The goal of this article is to review advances in computational modeling of the heart, with a focus on recent non-invasive clinical imaging- and simulation-based strategies aimed at improving the diagnosis and treatment of patients with arrhythmias and structural heart disease. Following a brief overview of the field of computational cardiology, we present recent applications of the personalized virtual-heart approach in predicting the optimal targets for infarct-related ventricular tachycardia and atrial fibrillation ablation, and in determining risk of sudden cardiac death in myocardial infarction patients...
March 2018: Current Opinion in Biomedical Engineering
Huan Wang, Xiaoru Che
INTRODUCTION: Differentiation of wide QRS complex tachycardia required repeated electrophysiological stimuli and mapping. However, instability of tachycardia would increase the difficulty in differential diagnosis. SYMPTOMS AND CLINICAL FINDINGS: In this paper, we reported a wide QRS tachycardia following ablation of an atrioventricular reentrant tachycardia participated by a poster-septal accessory pathway. Limited differentiation strategy was performed because the wide QRS tachycardia was self-limited and with unstable hemodynamics...
March 2018: Medicine (Baltimore)
Michał Orczykowski, Karolina Borowiec, Elzbieta Biernacka, Robert Bodalski, Piotr Urbanek, Pawel Derejko, Katarzyna Kodziszewska, Olgierd Wozniak, Aneta Fronczak, Kamil Marcinkiewicz, Krystyna Guzek, Agnieszka Fil, Grzegorz Warminski, Piotr Hoffman, Maria Bilinska, Lukasz Szumowski
BACKGROUND: After the surgical correction of Tetralogy of Fallot (TOF), surgical scars and natural obstacles form pathways capable of supporting an atrial tachyarrhythmia (AT). Radiofrequency ablation is effective, although the few studies to date on this topic had relatively short follow-up periods. AIM: The aims of the study were to evaluate the acute and long-term effects of RF ablation of AT and examine the characteristics of arrhythmia recurrence. METHODS: Tetralogy of Fallot patients (N 16, age 44...
March 14, 2018: Kardiologia Polska
Stephen A McCullough, Michael A Fifer, Pouya Mohajer, Patricia A Lowry, Caitlin O'Callaghan Reen, Aaron L Baggish, Gus J Vlahakes, Yuichi J Shimada
BACKGROUND: The clinical characteristics associated with elevated right atrial pressure (RAP) in hypertrophic cardiomyopathy (HCM) are unknown. Few data exist as to whether elevated RAP has prognostic implications in patients with HCM. This study investigated the clinical correlates and prognostic value of elevated RAP in HCM.Methods and Results:This retrospective cohort study was performed on 180 patients with HCM who underwent right heart catheterization between 1997 and 2014. Elevated RAP was defined as >8 mmHg...
March 9, 2018: Circulation Journal: Official Journal of the Japanese Circulation Society
Gerald Paul Fitzgerald, John Joseph Coughlan, Zahir Satti, Samer Arnous
A 23-year-old Asian student presented to our service with a 1-month history of fever, weight loss of 10 kg, night sweats, fatigue and general malaise. He was previously well with no significant medical or family history. He had a low-grade pyrexia and cardiac auscultation revealed a diastolic murmur consistent with 'tumour plop'. He had no sequelae of endocarditis. He had low-grade pyrexia of 37.7°C, and ECG showed sinus tachycardia at 130 bpm. He had raised inflammatory markers and was started on broad spectrum antibiotics...
March 9, 2018: BMJ Case Reports
Irene A Hurst, Gregory Webster, Kerri Z Machut, Nina Gotteiner, Ahmad Sami Chaouki, Elizabeth N Groothuis, Karna Murthy
OBJECTIVE(S): In well-appearing newborns with suspected cardiac ectopy, we sought to evaluate our practice and test whether initial electrocardiogram (ECG) findings were associated with neonatal arrhythmias (NA). STUDY DESIGN: We identified well-appearing, non-anomalous infants >34 weeks' gestation with suspected ectopy over 3.5 years. NA was defined as ≥10% premature atrial contractions (PAC), ≥5 beats of atrial tachycardia, ≥2% premature ventricular contractions (PVCs), or ≥3 beats of ventricular tachycardia...
March 7, 2018: Journal of Perinatology: Official Journal of the California Perinatal Association
Salma I Patel, Michael J Ackerman, Fadi E Shamoun, Jeffrey B Geske, Steve R Ommen, William T Love, Stephen S Cha, Johan M Bos, Steven J Lester
INTRODUCTION: Risk assessment for sudden cardiac death (SCD) in hypertrophic cardiomyopathy (HCM) remains complex. The goal of this study was to assess electrocardiogram (ECG)-derived risk factors on SCD in a large HCM population Methods: Retrospective review of adults with HCM evaluated at Mayo Clinic, Rochester, MN from 1 December 2002 to 31 December 2012 was performed. Data inclusive of ECG and 24-hour ambulatory Holter monitor were assessed. SCD events were documented by ventricular fibrillation (VF) noted on implantable cardioverter defibrillator (ICD), or appropriate VT or VF-terminating ICD shock...
March 7, 2018: Acta Cardiologica
Andreas Entenmann, Susann Dittrich, Vera Hessling, Christian Niederwanger, Gerard Cortina, Miriam Michel
BACKGROUND: Junctional ectopic tachycardia is a serious complication of surgery for paediatric congenital heart disease. R-wave synchronized atrial (AVT) pacing, an innovative temporary pacing technique, restores atrioventricular synchrony in these patients. The method is highly effective but technically complex. A standardized training model exists for doctors but not for paediatric intensive care nurses. AIMS: This study seeks to evaluate whether a standardized programme involving simulation and vignettes increases knowledge of AVT pacing and accuracy of its documentation, as well as recognition and management of specific complications...
March 6, 2018: Nursing in Critical Care
Prabhpreet Singh, Amit Noheria
Invasive electrophysiology (EP) mapping and catheter ablation has increasingly become the standard of care for many cardiac arrhythmias like supraventricular tachycardias, atrial fibrillation, premature ventricular complexes (PVC), and monomorphic ventricular tachycardia. In this review, we discuss the recent progress made in the mapping and ablation of ventricular fibrillation (VF). Ventricular activation during VF is apparently disorganized, making mapping and interpretation difficult. Prolonged mapping during VF would require mechanical circulatory support as VF causes complete hemodynamic collapse...
March 6, 2018: Current Treatment Options in Cardiovascular Medicine
Mark R de Jong, Annemiek F Hoogerwaard, Ahmet Adiyaman, Jaap Jan J Smit, Anand R Ramdat Misier, Jan-Evert Heeg, Boudewijn A A M van Hasselt, Isabelle C Van Gelder, Harry J G M Crijns, Ignacio Fernández Lozano, Jorge E Toquero Ramos, F Javier Alzueta, Borja Ibañez, José M Rubio, Fernando Arribas, José M Porres Aracama, Josep Brugada, Lluís Mont, Arif Elvan
BACKGROUND: Hypertension is an important, modifiable risk factor for the development of atrial fibrillation (AF). Even after pulmonary vein isolation (PVI), 20-40% experience recurrent AF. Animal studies have shown that renal denervation (RDN) reduces AF inducibility. One clinical study with important limitations suggested that RDN additional to PVI could reduce recurrent AF. OBJECTIVE: The goal of this multicenter randomized controlled study is to investigate whether RDN added to PVI reduces AF recurrence...
February 27, 2018: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
Jeffrey B Ziffra, Brian Olshansky
We present the case of a patient who presented with worsening chest pain and tachycardia. We were able to monitor her remotely through her pacemaker. She had been started on the injectable medication teriparatide (Forteo) and since then she had an increase in her symptoms. She was found to have intermittent atrial tachycardia with 1:1 conduction and occasional atrioventricular block transiently, coinciding with her injection of teriparatide. This specific-associated arrhythmia has yet to be described.
February 27, 2018: BMJ Case Reports
Dai-Yin Lu, Iraklis Pozios, Bereketeab Haileselassie, Ioannis Ventoulis, Hongyun Liu, Lars L Sorensen, Marco Canepa, Susan Phillip, M Roselle Abraham, Theodore P Abraham
BACKGROUND: Hypertrophic cardiomyopathy (HCM) is a common inherited cardiac disease characterized by varying degrees of left ventricular outflow tract obstruction. In a large cohort, we compare the outcomes among 3 different hemodynamic groups. METHODS AND RESULTS: We prospectively enrolled patients fulfilling standard diagnostic criteria for HCM from January 2005 to June 2015. Detailed phenotypic characterization, including peak left ventricular outflow tract pressure gradients at rest and after provocation, was measured by echocardiography...
February 25, 2018: Journal of the American Heart Association
Carlee D Ruediger, Bobby John, Sathesh Kumar, Han S Lim, Geetanjali Rangnekar, Kurt C Roberts-Thomson, Glenn D Young, David Chase, Prashanthan Sanders, Scott R Willoughby
BACKGROUND: It has been suggested that ethnicity can make a significant difference to the likelihood of thromboembolic stroke related to atrial fibrillation. Ethnic differences have been shown to alter inflammatory and haemostatic factors; however, this may all be confounded by differences in cardiovascular risk factors between different ethnicity. The impact of different ethnicities on the thrombogenic profile is not known. The aim of this study was to investigate differences in markers of inflammation, endothelial function and tissue remodelling between Caucasian and Indian populations with supraventricular tachycardia (SVT)...
January 2018: Indian Pacing and Electrophysiology Journal
Katie A Walsh, Joseph Galvin, John Keaney, Edward Keelan, Gabor Szeplaki
AIMS: Zero- and near-zero-fluoroscopic ablation techniques reduce the harmful effects of ionizing radiation during invasive electrophysiology procedures. We aimed to test the feasibility and safety of a zero-fluoroscopic strategy using a novel integrated magnetic and impedance-based electroanatomical mapping system for radiofrequency ablation (RFA) of supraventricular tachycardias (SVTs). METHODS: We retrospectively studied 92 consecutive patients undergoing electrophysiology studies with/without RFA for supraventricular tachycardia (SVT) performed by a single operator at a single center...
February 23, 2018: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
Catherine D E Wilder, Nikoleta Pavlaki, Tutku Dursun, Paul Gyimah, Ellice Caldwell-Dunn, Antonella Ranieri, Hannah R Lewis, Michael J Curtis
BACKGROUND & PURPOSE: Antiarrhythmic β-blockers are used in patients at risk of myocardial ischaemia, but the survival benefit and mechanisms are unclear. We hypothesised that β-blockers do not prevent ventricular fibrillation (VF), but instead inhibit the ability of catecholamines to facilitate ischaemia-induced VF, limiting the scope of their usefulness. EXPERIMENTAL APPROACH: ECGs were analysed from ischaemic Langendorff-perfused rat hearts perfused with adrenoceptor antagonists and/or exogenous catecholamines (313 nM noradrenaline+75 nM adrenaline; CATs) in a blinded and randomised study...
February 23, 2018: British Journal of Pharmacology
Yahiya Y Syed
Intravenous landiolol [Rapibloc® (EU)], an ultra short-acting highly cardioselective β1 -blocker, is approved in the EU for the rapid short-term control of tachyarrhythmias in the perioperative and intensive care settings. It has long been used in Japan to treat perioperative tachyarrhythmias. The efficacy of landiolol has been demonstrated in a large number of randomized controlled clinical trials. Landiolol significantly reduced heart rate in patients with postoperative or intraoperative supraventricular tachycardia relative to placebo and in those with atrial fibrillation/flutter and left ventricular dysfunction relative to digoxin...
February 22, 2018: Drugs
Stefan Andric, Dragica Tesic, Dalibor Somer, Ilija Srdanovic, Tatjana Miljkovic, Djordje G Jakovljevic, Lazar Velicki
OBJECTIVE AND IMPORTANCE: Endless loop tachycardia or pacemaker-mediated tachycardia, and atrioventricular desynchronization arrhythmia or repetitive non-reentrant ventriculoatrial synchrony (RNRVAS) are two forms of reverse impulse conduction - ventriculoatrial (VA) synchrony. Although VA synchrony can theoretically cause aggravation of heart failure, clinical cases describing severe consequential heart failure are lacking. CLINICAL PRESENTATION AND INTERVENTION: We describe a case of a 60-year-old patient who underwent primary percutaneous coronary intervention and mitral valve surgery...
February 21, 2018: Acta Clinica Belgica
Habib Rehman Khan, Ines Kralj-Hans, Shouvik Haldar, Toufan Bahrami, Jonathan Clague, Anthony De Souza, Darrel Francis, Wajid Hussain, Julian Jarman, David Gareth Jones, Neeraj Mediratta, Raad Mohiaddin, Tushar Salukhe, Simon Jones, Joanne Lord, Caroline Murphy, Joanna Kelly, Vias Markides, Dhiraj Gupta, Tom Wong
BACKGROUND: Atrial fibrillation is the commonest arrhythmia which raises the risk of heart failure, thromboembolic stroke, morbidity and death. Pharmacological treatments of this condition are focused on heart rate control, rhythm control and reduction in risk of stroke. Selective ablation of cardiac tissues resulting in isolation of areas causing atrial fibrillation is another treatment strategy which can be delivered by two minimally invasive interventions: percutaneous catheter ablation and thoracoscopic surgical ablation...
February 20, 2018: Trials
Kapil Kumar Gupta, Mukesh Srivastava, Vikrant Sudan, Shanker Kumar Singh, Soumen Choudhury, Daya Shanker
The present study was designed to assess the deleterious effects of bovine tropical theileriosis on the cardiovascular system and the consequent myocardial involvement in young calves. Myocardial effects in parasitic diseases are often neglected. Hemolytic anemia, associated secondary hypoxia, and vasculitis are cardinal features of bovine theileriosis. In the present study, electrocardiogram (ECG) alongside serum cardiac troponin I (cTnI) and creatinine phosphokinase-myocardial band (CPK-MB) concentrations were analyzed in infected, treated, and control groups of young calves...
February 17, 2018: Tropical Animal Health and Production
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