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Annals of Noninvasive Electrocardiology

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https://www.readbyqxmd.com/read/29271577/coarse-fibrillatory-waves-in-atrial-fibrillation-predict-success-of-electrical-cardioversion
#1
Tian X Zhao, Claire A Martin, John P Cooper, Parag R Gajendragadkar
BACKGROUND: To determine whether the presence of "coarse" fibrillatory waves (Fw) seen on surface ECGs of patients with persistent atrial fibrillation (AF) predict maintenance of sinus rhythm (SR) at 6 weeks after electrical cardioversion (ECV). METHODS: Preprocedure ECGs from 94 consecutive patients with persistent AF scheduled to undergo ECV at a single centre were classified as having coarse Fw (≥0.1 mV) or fine Fw (<0.1 mV) in leads II or V1 . The primary outcome was ECG rhythm at 6-week clinical follow-up...
December 22, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29271549/comparison-of-the-predictive-accuracy-of-four-different-ecg-algorithms-in-identification-of-true-ablation-site-for-the-idiopathic-right-ventricular-outflow-tract-tachycardias
#2
Mehmet Timur Selcuk, Kevser Gülcihan Balci, Orhan Maden, Hatice Selcuk, Murat Vicdan, Erol Kalender, Mustafa Mücahit Balci
BACKGROUND: We aimed to investigate the accuracy of four algorithms in prediction of right ventricular outflow tract (RVOT) tachycardias in patients who successfully underwent radiofrequency catheter ablation. METHODS: Four algorithms; two with easy-applicability and having a memorable design (Dixit and Joshi), and two with more complex and detailed design (Ito and Zhang) were compared according to the predictive accuracy. RESULTS: Among 99 patients (mean age 36...
December 22, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29271538/noninvasive-phase-mapping-of-persistent-atrial-fibrillation-in-humans-comparison-with-invasive-catheter-mapping
#3
Andreas Metzner, Erik Wissner, Alexey Tsyganov, Vitaly Kalinin, Michael Schlüter, Christine Lemes, Shibu Mathew, Tilmann Maurer, Christian-Hendrik Heeger, Bruno Reissmann, Feifan Ouyang, Amiran Revishvili, Karl-Heinz Kuck
BACKGROUND: A novel noninvasive epicardial and endocardial electrophysiology system (NEEES) to identify electrical rotors and focal activity in patients with atrial fibrillation (AF) was recently introduced. Comparison of NEEES data with results from invasive mapping is lacking. METHODS: Six male patients (59 ± 11 years) with persistent AF underwent cardiac mapping with the NEEES, which included the creation of isopotential and phase maps. Then patients underwent catheter mapping using a PentaRay NAV catheter and the CARTO 3 system...
December 22, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29266621/unshielded-magnetocardiography-repeatability-and-reproducibility-of-automatically-estimated-ventricular-repolarization-parameters-in-204-healthy-subjects
#4
Anna Rita Sorbo, Gianmarco Lombardi, Lara La Brocca, Gianluigi Guida, Riccardo Fenici, Donatella Brisinda
BACKGROUND: Magnetocardiographic mapping (MCG) provides quantitative assessment of the magnetic field (MF) induced by cardiac ionic currents, is more sensitive to tangential currents, and measures vortex currents undetectable by ECG, with higher reported sensitivity of MCG ventricular repolarization (VR) parameters for earlier detection of acute myocardial ischemia. Aims of this study were to validate the feasibility of in-hospital unshielded MCG and to assess repeatability and reproducibility of quantitative VR parameters, considering also possible gender- and age-related variability...
December 20, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29251398/relation-between-electrical-and-mechanical-dyssynchrony-in-patients-with-left-bundle-branch-block-an-electro-and-vectorcardiographic-study
#5
Jan De Pooter, Milad El Haddad, Victor Kamoen, Thomas Tibin Kallupurackal, Roland Stroobandt, Marc De Buyzere, Frank Timmermans
BACKGROUND: Current guidelines select patients for cardiac resynchronization therapy (CRT) mainly on electrocardiographic parameters like QRS duration and left bundle branch block (LBBB). However, among those LBBB patients, heterogeneity in mechanical dyssynchrony occurs and might be a reason for nonresponse to CRT. This study assesses the relation between electrocardiographic characteristics and presence of mechanical dyssynchrony among LBBB patients. METHODS: The study included patients with true LBBB (including mid-QRS notching) on standard 12-lead electrocardiograms...
December 18, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29226502/s-r-difference-in-v1-v2-is-a-novel-criterion-for-differentiating-the-left-from-right-ventricular-outflow-tract-arrhythmias
#6
Onur Kaypakli, Hasan Koca, Durmus Yıldıray Sahin, Fadime Karataş, Suleyman Ozbicer, Mevlüt Koç
AIM: The correct estimation of the VA origin as RVOT or LVOT results in reduced ablation duration reduced radiation exposure and decreased number of vascular access. In our study, we aimed to detect the predictive value of S-R difference in V1-V2 for differentiating the left from right ventricular outflow tract arrhythmias. METHODS: We included 123 patients with symptomatic frequent premature ventricular outflow tract contractions who underwent successful catheter ablation (70 male, 53 female; mean age 46...
December 10, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29219220/heart-rate-recovery-fast-to-slow-phase-transition-influence-of-physical-fitness-and-exercise-intensity
#7
Rhenan Bartels, Eliza Prodel, Mateus C Laterza, Jorge Roberto P de Lima, Tiago Peçanha
BACKGROUND: Postexercise heart rate (HR) recovery presents an exponential decay, with two distinct phases: a fast phase, characterized by abrupt decay of HR, and determined by parasympathetic reactivation; and a slow phase, characterized by gradual decay of HR, and predominantly determined by sympathetic withdrawal. Although several methods have been proposed to assess postexercise HR recovery, none of those methods selectively assesses the time of transition from the fast to the slow phase of the HR recovery curve (HRRPT ), and the magnitude of decay prior to (HRRFP ) and after this point (HRRSP )...
December 8, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29205672/repetitive-incessant-electrical-storm-triggered-by-early-repolarization
#8
Sofia Chatzidou, Evangelos Repasos, Sotiris Plastiras, Christos Kontogiannis, Marinos Kosmopoulos, Diamantis I Tsilimigras, Ioannis Paraskevaidis, Stelios Rokas
Early repolarization syndrome (ERS) was originally considered a normal variant with benign outcome. However, recent studies have demonstrated that it can be linked to a considerable risk of life-threatening arrhythmias and sudden cardiac death. We report a case with an extraordinary, extremely malignant clinical expression of ERS refractory to all antiarrhythmic drugs including quinidine. This case demonstrates real-time changes of dynamic electrocardiogram (ECG) preceding a polymorphic ventricular tachycardia (VT)-ventricular fibrillation (VF) and possible external factors triggering arrhythmia onset...
December 5, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29197146/is-myocardial-repolarization-duration-associated-with-repolarization-heterogeneity
#9
Keith A Marill, Pat Dorsey, Anthony Holmes, Ketaki Muthal, Emily S Miller, Joel Xue
BACKGROUND: Dispersion of repolarization is theorized as one mechanism by which myocardial repolarization prolongation causes lethal torsades de pointes, (TdP). Our primary purpose was to determine whether prolongation of myocardial repolarization as measured by the heart rate-corrected J-to-T peak interval (JTpkc), is associated with repolarization heterogeneity as measured by transmural dispersion, defined as the median duration from the peak to the end of the T wave (TpTe). METHODS: A retrospective cohort study was performed at a single urban tertiary ED from July 2011-September 2012...
December 2, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29194874/late-onset-severe-long-qt-syndrome
#10
Babken Asatryan, André Schaller, Deborah Bartholdi, Argelia Medeiros-Domingo
We report a case of torsades de pointes arrhythmia as the first manifestation of congenital Long QT syndrome in a 77-year-old man with family history of sudden unexplained death. This case illustrates the importance of vigilant clinical assessment and genetic counseling in families with sudden death in order to identify properly asymptomatic relatives at risk for cardiac events. It also demonstrates that Long QT syndrome can still manifest with potentially fatal arrhythmias late in life in previously asymptomatic elderly patients...
November 30, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29194868/narrowing-filtered-qrs-duration-on-signal-averaged-electrocardiogram-predicts-outcomes-in-cardiac-resynchronization-therapy-patients-with-nonischemic-heart-failure
#11
Atsushi Suzuki, Tsuyoshi Shiga, Daigo Yagishita, Yoshimi Yagishita-Tagawa, Kotaro Arai, Yuji Iwanami, Koichiro Ejima, Kyomi Ashihara, Morio Shoda, Nobuhisa Hagiwara
BACKGROUND: To evaluate the impact of changes in the filtered QRS duration (fQRS) on signal-averaged electrocardiograms (SAECGs) from pre- to postimplantation on the clinical outcomes in nonischemic heart failure (HF) patients under cardiac resynchronization therapy (CRT). METHODS: We studied 103 patients with nonischemic HF and sinus rhythm who underwent CRT implantation. SAECGs were obtained within 1 week before and 1 week after implantation and narrowing fQRS was defined as a decrease in fQRS from pre- to postimplantation...
November 30, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29194862/a-case-report-is-mexiletine-usage-effective-in-the-shortening-of-qtc-interval-and-improving-the-t-wave-alternans-in-timothy-syndrome
#12
Gulhan Tunca Sahin, Yakup Ergul
Timothy syndrome (TS) is a multisystemic disease that occurs because of a mutation in CACN1C gene and is characterized by prolonged QT interval. Mexiletine is a Class 1B antiarrhythmic drug that causes the disappearance of T-wave alternans by shortening QTc and peak-to-end of the T wave. It may block the development of torsades de pointes in a prolonged QT. This study presented the case of a patient diagnosed with TS and had a cardiac arrest history, prolonged QT, and T-wave alternans. After mexiletine treatment, the QTc interval shortened and T-wave alternans disappeared...
November 30, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29125226/loperamide-cardiotoxicity-a-brief-review
#13
REVIEW
Tamer Akel, Soad Bekheit
Loperamide is a popular antidiarrheal medication that has been used for many years. It is currently gaining more attention among healthcare professionals due to its increasing potential for side effects. At present, it is considered safe enough to be sold over the counter. In contrast with other opioid agonists, loperamide is a peripherally acting μ-receptor agonist exerting its effects mainly on the myenteric plexus of the gastrointestinal longitudinal muscle layer. It decreases peristalsis and fluid secretion resulting in longer gastrointestinal transit time...
November 10, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29105209/efficacy-and-safety-of-intravenous-vernakalant-for-the-rapid-conversion-of-recent-onset-atrial-fibrillation-a-meta-analysis
#14
REVIEW
Tamer Akel, James Lafferty
BACKGROUND: Atrial fibrillation is a common cardiac arrhythmia with increasing prevalence in the aging population. It is a major cause of emergency department visits worldwide. Vernakalant, a relatively new antiarrhythmic drug with selectively preferential effects on the atrial tissue is currently used in many European countries for the termination of recent-onset atrial fibrillation. Presently, the drug is still not approved by the United States Food and Drug Administration due to safety concerns...
November 4, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29297612/response-of-the-authors-to-the-letter-differentiation-of-wide-qrs-tachycardia-garbage-in-garbage-out
#15
LETTER
Vivek Reddy
No abstract text is available yet for this article.
January 2018: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29083088/clinical-applications-of-qt-rr-hysteresis-assessment-a%C3%A2-systematic-review
#16
REVIEW
Hugo Gravel, Vincent Jacquemet, Nagib Dahdah, Daniel Curnier
BACKGROUND: QT/RR hysteresis (QT-hys) is an index of the time accommodation of ventricular repolarization to heart rate changes. This report comprehensively reviews studies addressing QT-hys as a biomarker of medical conditions. METHODS: This is a secondary analysis of data from a recent systematic review pertaining to methods of assessment of QT-hys. Articles included in the former review were filtered in order to select original articles investigating the association of QT-hys with medical conditions in humans...
January 2018: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29105240/response-of-robyns-to-the-tse-s-letter-to-editor
#17
LETTER
Tomas Robyns, Hua Rong Lu, David J Gallacher, Christophe Garweg, Joris Ector, Rik Willems, Stefan Janssens, Dieter Nuyens
No abstract text is available yet for this article.
November 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28670758/congenital-long-qt-syndrome-and-torsade-de-pointes
#18
REVIEW
Nabil El-Sherif, Gioia Turitto, Mohamed Boutjdir
Since its initial description by Jervell and Lange-Nielsen in 1957, the congenital long QT syndrome (LQTS) has been the most investigated cardiac ion channelopathy. A prolonged QT interval in the surface electrocardiogram is the sine qua non of the LQTS and is a surrogate measure of the ventricular action potential duration (APD). Congenital as well as acquired alterations in certain cardiac ion channels can affect their currents in such a way as to increase the APD and hence the QT interval. The inhomogeneous lengthening of the APD across the ventricular wall results in dispersion of APD...
November 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28618169/ecg-derived-cheyne-stokes-respiration-and-periodic-breathing-in-healthy-and-hospitalized-populations
#19
Adelita Tinoco, Barbara J Drew, Xiao Hu, David Mortara, Bruce A Cooper, Michele M Pelter
BACKGROUND: Cheyne-Stokes respiration (CSR) has been investigated primarily in outpatients with heart failure. In this study we compare CSR and periodic breathing (PB) between healthy and cardiac groups. METHODS: We compared CSR and PB, measured during 24 hr of continuous 12-lead electrocardiographic (ECG) Holter recording, in a group of 90 hospitalized patients presenting to the emergency department with symptoms suggestive of acute coronary syndrome (ACS) to a group of 100 healthy ambulatory participants...
November 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28608483/brugada-syndrome-brugada-phenocopy-or-none
#20
Umut Kocabas, Can Hasdemir, Esra Kaya, Cuneyt Turkoglu, Adrian Baranchuk
Brugada syndrome is a form of inherited arrhythmia syndrome characterized by a distinct ST-segment elevation in the right precordial leads. Brugada phenocopies are clinical entities that present with an electrocardiographic pattern identical to Brugada syndrome and may obey to various clinical conditions. We present a case of a suicidal attempt using a high dose of propafenone causing a Brugada-type electrocardiographic pattern. Is this a Brugada syndrome case, a Brugada phenocopy or something else?
November 2017: Annals of Noninvasive Electrocardiology
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