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https://www.readbyqxmd.com/read/28702812/characterisation-of-human-av-nodal-properties-using-a-network-model
#1
Mikael Wallman, Frida Sandberg
Characterisation of the AV-node is an important step in determining the optimal form of treatment for supraventricular tachycardias. To integrate and analyse patient-specific measurements, mathematical modelling has emerged as a valuable tool. Here we present a model of the human AV-node, consisting of a series of interacting nodes, each with separate dynamics in refractory time and conduction delay. The model is evaluated in several scenarios, including atrial fibrillation (AF) and clinical pacing, using simulated and measured data...
July 13, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28671912/errors-during-resuscitation-the-impact-of-perceived-authority-on-delivery-of-care
#2
Nicole Jane Delaloye, Kathy Tobler, Thomas OʼNeill, Afrothite Kotsakis, Jessica Cooper, Ilana Bank, Elaine Gilfoyle
OBJECTIVE: The aim of this study was to determine the influence of perceived authority on pediatric resuscitation teams' response to an incorrect order given by a medical superior. METHODS: As part of a larger multicenter prospective interventional study, interprofessional pediatric resuscitation teams (n = 48) participated in a video-recorded simulated resuscitation scenario with an infant in unstable, refractory supraventricular tachycardia. A confederate actor playing a senior physician entered the scenario partway through and ordered the incorrect dose and delivery method of the antiarrhythmic, procainamide...
June 30, 2017: Journal of Patient Safety
https://www.readbyqxmd.com/read/28664446/postnatal-outcomes-of-fetal-supraventricular-tachycardia-a-multicenter-study
#3
Kevin A Hinkle, Shabnam Peyvandi, Corey Stiver, Stacy A S Killen, Hsin Yi Weng, Susan P Etheridge, Michael D Puchalski
Supraventricular tachycardia (SVT), the most common fetal tachycardia, can be difficult to manage in utero. We sought to better understand predictors of the postnatal clinical course in neonates who experienced fetal SVT. We hypothesized that fetuses with hydrops or those with refractory SVT (failure of first-line SVT therapy) are more likely to experience postnatal SVT. This was a retrospective multicenter cohort study of subjects diagnosed with fetal SVT between 2006 and 2014. Fetuses with structural heart disease were excluded...
June 29, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28436586/transesophageal-and-invasive-electrophysiologic-evaluation-in-children-with-wolff-parkinson-white-pattern
#4
Serhat Koca, Feyza Aysenur Pac, Ahmet Vedat Kavurt, Serkan Cay, Ajda Mihcioglu, Dursun Aras, Serkan Topaloglu
BACKGROUND: Risk stratification for Wolff-Parkinson-White (WPW) pattern either by noninvasive or invasive tests is important to determine whether an ablation is necessary or not. The aim was to compare noninvasive tests and invasive studies in a pediatric WPW population. METHODS: A total of 71 WPW patients (median age 14 years [interquartile range, 11-16 years]; 43 male) underwent Holter monitoring, exercise stress test (EST), and transesophageal electrophysiological study (TEEPS)...
April 24, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28239808/atrial-fibrillation-prevalence-and-atrial-vulnerability-analysis-in-paroxysmal-supraventricular-tachycardia-patients-after-radiofrequency-ablation
#5
Q-X Zhao, Y-M Zhao, L Mao, D-L Shen, X-Y Zhao
OBJECTIVE: Paroxysmal supraventricular tachycardia (PSVT) patient has higher prevalence ratio of atrial fibrillation (AF), while AF recurrence remains a high ratio after radiofrequency ablation (RFCA). This study explored AF prevalence and atrial vulnerability in PSVT patients after RFCA, using ROC curve to analyze atrial effective refractory period dispersion (dERP) on postoperative AF in the prediction of PSVT. PATIENTS AND METHODS: The PSVT patients were enrolled and divided into three groups and received RFCA treatment between January 2010 and December 2014...
February 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28114840/flecainide-as-first-line-treatment-for-fetal-supraventricular-tachycardia
#6
Ali Ekiz, Basak Kaya, Helen Bornaun, Deniz Kanber Acar, Muhittin Eftal Avci, Aysegul Bestel, Gokhan Yildirim
OBJECTIVE: The aim of this study was to evaluate utilization, efficacy, and side effects of flecainide treatment as first-line agent in patients with fetal supraventricular tachycardia (SVT). METHOD: This retrospective review was conducted on 23 consecutive fetal tachyarrhythmia cases that met inclusion criteria. If the treatment was necessary, then flecainide was used as first-line treatment in all cases. RESULT: Among the study group, there were 21 (91...
February 14, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/27989257/high-dose-adenosine-for-refractory-supraventricular-tachycardia-a-case-report-and-literature-review
#7
Gal Dadi, Daniel Fink, Giora Weiser
Supraventricular tachycardia is the most common significant arrhythmia in children. If prolonged, it may cause heart failure and progress to cardiogenic shock warranting prompt treatment. The recommended interventions following vagal manoeuvres are intravenous adenosine and in the unstable patient electrical cardioversion. We present an infant with an unstable supraventricular tachycardia that was resistant to electrical cardioversion and recommended doses of adenosine. He reverted to sinus rhythm with a higher dose of adenosine, suggesting that such doses may be required in refractory supraventricular tachycardia...
July 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/27912926/acute-management-of-refractory-and-unstable-pediatric-supraventricular-tachycardia
#8
Jonathan Lewis, Gaurav Arora, Dana L Tudorascu, Robert W Hickey, Richard A Saladino, Mioara D Manole
OBJECTIVE: To characterize the management of acute pediatric supraventricular tachycardia (SVT), placing special emphasis on infants, patients refractory to adenosine (refractory SVT), and patients with hypotension, poor perfusion, or altered mental status (unstable SVT). STUDY DESIGN: Retrospective cohort study of patients 0-18 years of age without congenital heart disease who presented to our pediatric hospital from January 2003 to December 2012 for the treatment of acute SVT...
February 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/27837305/rate-control-by-transoesophageal-atrial-overdrive-pacing-for-refractory-supraventricular-tachycardia-with-severe-ventricular-dysfunction-a-bridge-to-recovery
#9
C Paech, J Janousek, F Wagner, R A Gebauer
Tachyarrhythmia-induced cardiomyopathy (TIC) is a rare, yet life-threatening phenomenon in children. TIC has been defined as myocardial dysfunction that is entirely or partially reversible after control of the responsible tachyarrhythmia and is typically caused by an incessant supraventricular tachycardia. In cases of unsuccessful termination of the tachycardia, cardiogenic shock may occur. Several authors favour the use of mechanical circulatory support in such cases. Particularly with regard to these partly severe cases, the authors would like to present the option of transoesophageal overdrive pacing (TOP) as a tool for initial heart rate control and hemodynamic stabilization of patients with TIC refractory to conventional strategies of tachycardia termination...
February 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/27814325/fatal-cardiac-arrest-in-2-children-possible-role-of-ondansetron
#10
Scott M Brenner, Jenny Boucher
INTRODUCTION: Ondansetron is commonly used to treat vomiting in gastroenteritis, but has a United States Food and Drug Administration black box warning for risk of Q wave to T wave time interval (QT) prolongation. We report 2 pediatric cases of fatal refractory cardiac arrest after administration of ondansetron. CASES: A 10-year-old previously healthy boy presented to the emergency room with gastroenteritis symptoms. After intravenous fluids, morphine, antibiotics, and 2 doses of ondansetron, the patient became unresponsive with agonal respirations and a wide complex tachycardia consistent with ventricular tachycardia...
November 2016: Pediatric Emergency Care
https://www.readbyqxmd.com/read/27766996/non-fluoroscopic-cardiac-ablation-of-neonates-with-chd
#11
Amee M Bigelow, Brandon S Arnold, Gregory C Padrutt, John M Clark
In current practice, children with anatomically normal hearts routinely undergo fluoroscopy-free ablations. Infants and children with congenital heart disease (CHD) represent the most difficult population to perform catheter ablation without fluoroscopy. We report two neonatal patients with CHD in whom cardiac ablations were performed without fluoroscopy. The first infant had pulmonary atresia with intact ventricular septum with refractory supraventricular tachycardia, and the second infant presented with Ebstein's anomaly of the tricuspid valve along with persistent supraventricular tachycardia...
October 21, 2016: Cardiology in the Young
https://www.readbyqxmd.com/read/27512864/zero-fluoroscopy-catheter-ablation-of-severe-drug-resistant-arrhythmia-guided-by-ensite-navx-system-during-pregnancy-two-case-reports-and-literature-review
#12
REVIEW
Guangzhi Chen, Ge Sun, Renfan Xu, Xiaomei Chen, Li Yang, Yang Bai, Shanshan Yang, Ping Guo, Yan Zhang, Chunxia Zhao, Dao Wen Wang, Yan Wang
BACKGROUND: Cardiac arrhythmias can occur during pregnancy. Owing to radiation exposure and other uncertain risks for the mother and fetus, catheter ablation has rarely been performed and is often delayed until the postpartum period. We reported 2 pregnant women who were experiencing severe arrhythmias and were successfully ablated without fluoroscopic guidance. We also carried out a literature review of cases of pregnant women who underwent zero-fluoroscopy ablation. METHODS AND RESULTS: One woman had drug-resistant and poorly tolerated frequent premature ventricular contraction (PVC) and ventricular tachycardia (VT)...
August 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27090609/long-rp-tachycardia-with-unusual-entrainment-responses-what-is-the-mechanism
#13
Atsushi Doi, Masahiko Takagi, Kouhei Fujimoto, Jun Kakihara, Yusuke Hayashi, Hiroaki Tatsumi, Minoru Yoshiyama
A 71-year-old man with palpitation was referred for electrophysiological study and radiofrequency ablation. Baseline findings of 12-lead electrocardiogram during sinus rhythm and echocardiography were normal. Atrio-His (AH) and His-ventricular (HV) intervals were measured as 113 and 40 ms, respectively. Dual atrioventricular (AV) nodal physiology was observed during programmed atrial stimulation. The earliest atrial activation during ventricular constant pacing was recorded at His bundle region, and para-Hisian pacing showed AV nodal pattern...
April 19, 2016: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/27005930/prolonged-atrial-refractoriness-predicts-the-onset-of-atrial-fibrillation-a-12-year-follow-up-study
#14
Jung Myung Lee, Hancheol Lee, Ajit H Janardhan, Junbeom Park, Boyoung Joung, Hui-Nam Pak, Moon-Hyoung Lee, Sung Soon Kim, Hye Jin Hwang
BACKGROUND: Tissue refractoriness to conduction is a crucial electrophysiological factor in determining susceptibility to fibrillation. The relationship between atrial refractoriness and future onset of atrial fibrillation (AF) has not been well studied. OBJECTIVES: We investigated whether atrial effective refractory period (AERP) was associated with AF occurrence in a relatively healthy population. METHODS: A total of 1308 patients with no overt structural heart diseases and no evidence of congestive heart failure who underwent electrophysiology studies for paroxysmal supraventricular tachycardia from January 1986 to January 2011 were included in the study (626 male, mean age 44 ± 16 years)...
August 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/26970452/an-atypical-presentation-of-a-typical-arrhythmia
#15
Ayelet Shauer, Asaf Danon, Sheldon M Singh
No abstract text is available yet for this article.
June 2016: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/26818382/high-dose-adenosine-for-treatment-of-refractory-supraventricular-tachycardia-in-an-emergency-department-of-an-academic-medical-center-a-case-report-and-literature-review
#16
REVIEW
Abby M Bailey, Regan A Baum, Justin Rose, Roger L Humphries
BACKGROUND: Symptomatic tachycardia is a common admission diagnosis in the emergency department (ED). This can be a life-threatening condition and requires immediate attention. Supraventricular tachycardia (SVT) is commonly treated with adenosine, and successful treatment is limited to atrioventricular (AV) node-dependent SVTs as adenosine causes a transient heart block. However, there are limited data available for instances when the recommended dosing regimen (6 mg, 12 mg, 12 mg) fails to terminate SVT...
March 2016: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/26725457/clinical-profile-of-atypical-manifestations-of-dengue-fever
#17
Sriram Pothapregada, Banupriya Kamalakannan, Mahalakshmy Thulasingam
OBJECTIVES: To study the clinical profile and outcome of the atypical manifestations of dengue fever in children. METHODS: All children (0-12 y of age) diagnosed and confirmed as dengue fever at a tertiary care hospital at Puducherry, between the 1st of August 2012 and January 31st 2015 were reviewed retrospectively from hospital case records as per the revised World Health Organization (WHO) guidelines 2011 for dengue fever. The diagnosis was confirmed by NS1 antigen-based ELISA test or dengue serology for IgM and IgG antibodies and the data was analyzed using SPSS 16...
June 2016: Indian Journal of Pediatrics
https://www.readbyqxmd.com/read/26699148/effects-of-landiolol-on-refractory-tachyarrhythmia-after-total-cavopulmonary-connection-a-retrospective-observational-cohort-study
#18
Kentaro Miyake, Yoshihito Fujita, Saya Yoshizawa, Maiko Tomita, Mitsunori Miyazu, Yoshiki Sento, Shinichiro Yoshimura, Kazuya Sobue
The onset of tachyarrhythmia after the Fontan procedure (total cavopulmonary connection; TCPC) should be considered a medical emergency. Landiolol is an ultra-short-acting β1-selective blocker whose effect on tachyarrhythmia after TCPC is unclear. We evaluated the efficacy and safety of landiolol for tachyarrhythmia after TCPC. Consecutive patients undergoing TCPC were enrolled from January 2007 to December 2011. Of 435 pediatric open heart surgeries, 28 patients underwent TCPC. Of the 28 patients, 13 were treated with landiolol for critical tachyarrhythmia...
April 2016: Journal of Anesthesia
https://www.readbyqxmd.com/read/26552613/paroxysmal-supraventricular-tachycardia-with-ventriculoatrial-block-and-qrs-duration-shortening-what-is-the-mechanism
#19
Paul Chun Yih Lim, Daniel Thuan Tee Chong, Boon Yew Tan, Kah Leng Ho, Wee Siong Teo, Chi Keong Ching
No abstract text is available yet for this article.
May 2016: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/26536985/the-use-of-flecainide-in-critical-neonates-and-infants-with-incessant-supraventricular-tachycardias
#20
Yakup Ergül, İsa Özyılmaz, Murat Saygı, Hasan Tahsin Tola, Celal Akdeniz, Volkan Tuzcu
OBJECTIVE: This study aimed to evaluate the efficacy of flecainide therapy in neonates and infants with drug resistant incessant supraventricular tachycardia. METHODS: The study included 11 neonates and infants who received medical and/or ablation therapy between January 2010 and December 2013. Mean patient age and weight were 101.6 ± 96 days and 5.3 ± 1.9 kg respectively. Of the 12 patients, 5 underwent ablation between January 2010 and December 2011, and 6 were treated medically between January 2012 and December 2013...
October 2015: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
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