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Journal of Electrocardiology

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https://www.readbyqxmd.com/read/28190561/correlation-between-the-high-frequency-content-of-the-qrs-on-murine-surface-electrocardiogram-and-the-sympathetic-nerves-density-in-left-ventricle-after-myocardial-infarction-experimental-study
#1
Golriz Sedaghat, Ryan T Gardner, Muammar M Kabir, Elyar Ghafoori, Beth A Habecker, Larisa G Tereshchenko
Denervated post-infarct scar is arrhythmogenic. Our aim was to compare QRS frequency content in denervated and innervated left ventricular (LV) scar. In-vivo single lead ECG telemetry device was implanted in 17 heterozygous PTPσ (HET) and 7 lacking PTPσ (KO) transgenic mice. Myocardial infarction (MI) with reperfusion and sham surgery was performed. HET mice developed a denervated scar, whereas KO mice developed innervated scar. The power spectral density was used to assess the QRS frequency content. Denervated as compared to innervated post-MI scar was characterized by the higher relative contribution of 300-500Hz (14±1 vs...
February 3, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28202194/study-of-factors-affecting-the-progression-and-termination-of-drug-induced-torsade-de-pointes-in-two-dimensional-cardiac-tissue
#2
Ponnuraj Kirthi Priya, M Ramasubba Reddy
INTRODUCTION: To study the conditions leading to the initiation and termination of drug induced Torsade de pointes (TdP) along with QT prolongation. METHODS: A 2D anisotropic transmural section of the ventricular myocardium is modeled using the TP06 equations and the cells are interconnected with gap junction conductances (GJC). The tissue is remodeled by reducing the repolarization reserve (by increasing calcium current (ICaL)) of all cells thus making them vulnerable to development of early after depolarizations (EADs)...
February 2, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28189281/ecg-quiz-murphy-s-law-strikes-again
#3
Vanessa Al Rashida, J Evan Astin, Irwin Hoffman
ECG Quiz: An unusual ECG in a 77year old man with chest pain.
February 2, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28189280/junctional-ectopic-tachycardia-in-late-period-after-early-postoperative-complete-atrioventricular-block-messenger-of-return-to-normal-sinus-rhythm-explanation-with-four-case-series
#4
Isa Ozyilmaz, Yakup Ergul, Sinem Ozyilmaz, Alper Guzeltas
Junctional ectopic tachycardia(JET) is a rare childhood arrhythmia originating from the area adjacent to the atrioventricular(AV) node. It often occurs after surgical procedures like repair of Tetralogy of Fallot, atrioventricular septal defect and ventricular septal defect, which are all performed in that area. While AV block (AVB) can occur after JET, it is very rare for late JET occurring after early postoperative AVB to be followed by normal sinus rhythm (NSR). There is no information in the literature related to the pathophysiology of this phenomenon...
February 1, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28118928/atrial-fibrillation-detected-by-external-loop-recording-for-seven-days-or-two-day-simultaneous-holter-recording-a-comparison-in-patients-with-ischemic-stroke-or-transient-ischemic-attack
#5
Michala Herskind Sejr, Jens Cosedis Nielsen, Dorte Damgaard, Birgitte Forsom Sandal, Ole May
: Atrial fibrillation (AF) is the most common cardiac cause of ischemic stroke and transient ischemic attack (IS/TIA). AIM: To compare the diagnostic value of seven-day external loop recording (ELR) and two-day Holter recording for detecting AF after IS/TIA. METHODS: 191 IS/TIA patients without AF history. Endpoint was AF >30s. We started two-day Holter recording and seven-day ELR simultaneously. RESULTS: Seven-day ELR and two-day Holter recording detected the same three AF patients...
January 17, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28117102/a-challenging-case-of-narrow-complex-tachycardia
#6
Vivek Reddy, Shanker Kundumadam, Pradeep Kathi, Nadia Nasser, Mazhar Khan
No abstract text is available yet for this article.
January 17, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28159337/normal-computerized-q-wave-measurements-in-healthy-young-athletes
#7
Divakar Saini, Aaron F Grober, David Hadley, Victor Froelicher
BACKGROUND: Recent Expert consensus statements have sought to decrease false positive rates of electrocardiographic abnormalities requiring further evaluation when screening young athletes. These statements are largely based on traditional ECG patterns and have not considered computerized measurements. OBJECTIVE: To define the normal limits for Q wave measurements from the digitally recorded ECGs of healthy young athletes. METHODS: All athletes were categorized by sex and level of participation (high school, college, and professional), and underwent screening ECGs with routine pre-participation physicals, which were electronically captured and analyzed...
January 16, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28129887/a-left-lateral-accessory-pathway-unmasked-by-rivastigmine
#8
Charles Guenancia, Marie Fichot, Fabien Garnier, Mathieu Montoy, Gabriel Laurent
A 75-year-old woman was referred for advice regarding surface electrocardiographic modifications after the initiation of rivastigmine. In our patient, the baseline ECGs appeared perfectly normal. However, the initiation of a cholinesterase inhibitor unmasked a left lateral accessory pathway that had never been diagnosed before. Although cholinesterase inhibitors are known to increase vagal tone, the PR interval was shortened after rivastigmine administration, thus excluding this hypothesis to explain the appearance of the accessory pathway...
January 16, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28109524/torsades-de-pointes-with-high-dose-loperamide
#9
Patrick M Kozak, Amanda K Harris, John A McPherson, Dan M Roden
CASE: A 41year-old male presented with torsades de pointes. The patient was taking over 100mg of loperamide per day to self-medicate for chronic pain. Coronary angiography, cardiac magnetic resonance imaging, and genetic testing were negative for pre-disposing ischemia, cardiomyopathy, or genetic variant respectively. CONCLUSIONS: Patients without predisposing genetic or cardiac abnormalities are at risk of life-threatening QTc prolongation and torsades with use of high-dose loperamide...
January 16, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28117101/the-relationship-between-fragmented-qrs-and-functional-significance-of-coronary-lesions
#10
Ahmet Korkmaz, Abdulkadir Yildiz, Mevlut Demir, Burcu Ozyazgan, Ekrem Sahan, Burak Acar, Umit Guray, Mehmet Ileri, Ozgul Ucar Elalmis
BACKGROUND: Recently fragmented QRS (fQRS) on electrocardiography (ECG) has been introduced as a predictor of myocardial scarring and myocardial ischemia in coronary artery disease (CAD). OBJECTIVE: The aim of this study was to investigate the relationship between fQRS and fractional flow reserve (FFR) results in patients with the intermediate degree of coronary artery stenosis. METHODS: A total of 301 consecutive patients who underwent coronary angiography (CAG) and FFR measurement for intermediate coronary artery stenosis were included in the study...
January 15, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28109525/wire-and-needle-potentials-facilitating-transseptal-puncture
#11
Konstantin M Heinroth, Thomas Hartkopf, Alexander Plehn, Joachim Wilhelm, Susanne Unverzagt, Stefan Frantz, Alexander Schirdewan
BACKGROUND: Transseptal puncture for left heart interventions became a routine procedure guided by fluoroscopy and echocardiography. The use of intracardiac potentials derived from the sheath-transseptal-needle/guidewire-combination may provide helpful information to increase safety of this procedure. METHODS AND RESULTS: We recorded the intracardiac potentials from the sheath-transseptal-needle/guidewire-combination during the transseptal puncture procedure in 31 consecutive patients (mean age 67...
January 15, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28108014/electrocardiographic-spatial-loops-indicate-organization-of-atrial-fibrillation-minutes-before-ablation-related-transitions-to-atrial-tachycardia
#12
Tina Baykaner, Rishi Trikha, Junaid A B Zaman, David E Krummen, Paul J Wang, Sanjiv M Narayan
BACKGROUND: During ablation for atrial fibrillation (AF), it is challenging to anticipate transitions to organized tachycardia (AT). Defining indices of this transition may help to understand fibrillatory conduction and help track therapy. OBJECTIVE: To determine the timescale over which atrial fibrillation (AF) organizes en route to atrial tachycardia (AT) using the ECG referenced to intracardiac electrograms. METHODS: In 17 AF patients at ablation (58...
January 15, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28126337/reservations-about-the-selvester-qrs-score-in-left-bundle-branch-block-experience-in-patients-with-transcatheter-aortic-valve-implantation
#13
Thomas T Poels, Suzanne Kats, Leo Veenstra, Vincent van Ommen, Jos G Maessen, Frits W Prinzen
BACKGROUND: The Selvester QRS score (S-score) estimates myocardial scar using electrocardiographic criteria. We evaluated the S-score for left bundle branch block (LBBB). MATERIAL AND METHODS: Studied were 36 patients who developed persistent LBBB upon transcatheter aortic valve implantation (TAVI, TAVI-LBBB group) and 36 matched patients with persistent narrow QRS (TAVI-nQRS group). Electrocardiograms were recorded before and briefly after TAVI and during ~6months follow-up...
January 12, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28093191/re-galen-wagner-another-perspective
#14
LETTER
Charles Maynard
No abstract text is available yet for this article.
January 12, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28081851/a-new-use-for-maximum-deflection-index-detection-of-intraventricular-dyssynchrony
#15
Durmuş Yıldıray Şahin, Onur Kaypaklı, Gökhan Gözübüyük, Mevlüt Koç
AIM: CRT has been shown to be very beneficial for patients with reduced LVEF, symptomatic HF and increased QRS width. But many patients do not benefit from CRT. Maximum deflection index (MDI) is a quantitive measure of the rapidity of depolarization of the myocardium. In previous studies, high MDI was found to indicate epicardial origin of ventricular tachycardia. We aimed to detect the relationship between echocardiographic intraventricular dyssynchrony and MDI. METHODS: We included 144 patients with HF, QRS≥120ms, LBBB, NYHA II-IV, LVEF<35% and scheduled for CRT (90 male, 54 female; mean age 65...
December 30, 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28069274/extended-bipolar-left-ventricular-pacing-as-a-possible-therapy-for-late-electrical-storm-induced-by-cardiac-resynchronization-therapy
#16
Dimitrios Asvestas, Richard Balasubramaniam, Mark Sopher, John Paisey, Girish G Babu
Although cardiac resynchronization therapy (CRT) has become a well-established treatment option for patients with drug-refractory severe systolic heart failure, there has been some evidence of adverse proarrhythmic events. We report a case of a patient with ischemic cardiomyopathy who underwent CRT with a defibrillator for primary prevention of sudden cardiac death. Two years after the implantation, the patient presented with electrical storm, which was completely terminated by modifying the left ventricular (LV) pacing configuration from true to extended bipolar LV pacing...
December 30, 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28081852/brugada-sign-in-a-patient-with-hyperkalemia-due-to-rhabdomyolysis-in-hypothermia
#17
Kristóf Tomcsányi, János Tomcsányi
The Brugada sign may appear as an indication of severe hyperkalemia. This phenomena has recently been called as the "Brugada phenocopy". Hyperthermia and hypothermia may lead to rhabdomyolysis. Rhabdomyolysis is a syndrome characterized by muscle necrosis and the release of intracellular muscle constituents into the circulation. We present a case where rhabdomyolysis-related delayed hyperkalemia showed Brugada sign on the ECG mimicking ventricular tachycardia.
December 29, 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28073434/two-to-one-crtd-pacing-when-the-t-wave-and-the-p-wave-interact
#18
Hilmi Alnsasra, Moti Haim, Aref Alnsasra, Yuval Konstantino
We presented a unique phenomenon of 2:1 cardiac resynchronization therapy pacing due to T wave oversensing. Ultimately, by utilizing a unique feature of integrated bipolar sensing, we succeeded to eliminate the T wave oversensing signals, and restore 1:1 CRTD pacing. Importantly, this feature enabled us to overcome the T wave oversensing issue, without the need to decrease the ventricular sensitivity, which could potentially interfere with ventricular arrhythmia detection and appropriate shock delivery when required...
December 29, 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28069275/optimal-configuration-of-adhesive-ecg-patches-suitable-for-long-term-monitoring-of-a-vectorcardiogram
#19
Muammar M Kabir, Erick A Perez-Alday, Jason Thomas, Golriz Sedaghat, Larisa G Tereshchenko
The purpose of this study was to develop optimal configuration of adhesive ECG patches placement on the torso, which would provide the best agreement with the Frank orthogonal ECGs. Ten seconds of orthogonal ECG followed by 3-5min of ECGs using patches at 5 different locations simultaneously on the torso were recorded in 50 participants at rest in sitting position. Median beat was generated for each ECG and 3 patch ECGs that best correlate with orthogonal ECGs were selected for each participant. For agreement analysis, spatial QRS-T angle, spatial QRS and T vector characteristics, spatial ventricular gradient, roundness, thickness and planarity of vectorcardiographic (VCG) loops were measured...
December 29, 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28069273/does-antiarrhythmic-drugs-premedication-improve-electrical-cardioversion-success-in-persistent-atrial-fibrillation
#20
Elisabetta Toso, Mario Iannaccone, Domenico Caponi, Francesco Rotondi, Antonio Santoro, Cristina Gallo, Marco Scaglione, Fiorenzo Gaita
AIMS: Aim of this study is to evaluate the impact of antiarrhythmic drugs (AADs) administration for at least one month before ECV on the acute and long term success rate of the procedure. METHODS: 1313 consecutive persistent AF patients were enrolled in 3 different centers (Turin, Asti and Avellino): 692 patients received AADs before and after ECV (group A), 621 patients were treated only after the procedure, at discharge (group B). Primary end point was the restoration and maintenance of sinus rhythm acutely and at a long-term follow up...
December 29, 2016: Journal of Electrocardiology
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