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https://www.readbyqxmd.com/read/29225104/evaluation-of-qt-dispersion-and-t-peak-to-t-end-interval-in-patients-with-early-stage-sarcoidosis
#1
Hacı Ahmet Kasapkara, Ayşegül Şentürk, Emine Bilen, Hüseyin Ayhan, Bilge Duran Karaduman, Zeynep Şeyma Turinay, Murat Can Güney, Tahir Durmaz, Telat Keleş, Engin Bozkurt
INTRODUCTION AND AIM: Sarcoidosis increases inhomogeneity in ventricular repolarization due to the presence of sarcoid granuloma, which significantly correlates with ventricular fibrillation. Various studies have suggested that the interval from the peak to the end of the electrocardiographic T wave (T-peak to T-end [Tpe] interval) may correspond to the transmural dispersion of repolarization and that increased Tpe interval and Tpe/QT ratio are associated with malignant ventricular arrhythmias...
December 7, 2017: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29223306/diagnostic-accuracy-of-multi-lead-ecgs-obtained-using-a-pocket-sized-bipolar-handheld-event-recorder
#2
Ani Nigolian, Nicolas Dayal, Haïg Nigolian, Carine Stettler, Haran Burri
BACKGROUND: Handheld ECG event recorders are useful for rhythm monitoring but only record a single lead, which may limit interpretation. We sought to investigate if a multi-lead ECG may be reconstituted using this device, and aimed to evaluate diagnostic accuracy. METHODS: A commercially-available handheld bipolar ECG event recorder was used to reconstruct a 9-lead ECG (leads I, II and III, V1-6). Tracings were analyzed independently by a cardiologist and a fellow...
November 21, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/29223181/reduced-cardiotoxicity-and-increased-oral-efficacy-of-artemether-polymeric-nanocapsules-in-plasmodium-berghei-infected-mice
#3
Ana Carolina Moreira Souza, Vanessa Carla Furtado Mosqueira, Ana Paula Amariz Silveira, Lidiane Rodrigues Antunes, Sylvain Richard, Homero Nogueira Guimarães, Andrea Grabe-Guimarães
Artemether (ATM) cardiotoxicity, its short half-life and low oral bioavailability are the major limiting factors for its use to treat malaria. The purposes of this work were to study free-ATM and ATM-loaded poly-ε-caprolactone nanocapules (ATM-NC) cardiotoxicity and oral efficacy on Plasmodium berghei-infected mice. ATM-NC was obtained by interfacial polymer deposition and ATM was associated with polymeric NC oily core. For cardiotoxicity evaluation, male black C57BL6 uninfected or P. berghei-infected mice received, by oral route twice daily/4 days, vehicle (sorbitol/carboxymethylcellulose), blank-NC, free-ATM or ATM-NC at doses 40, 80 or 120 mg kg-1...
December 10, 2017: Parasitology
https://www.readbyqxmd.com/read/29220423/tpeak-tend-interval-during-therapeutic-hypothermia-can-predict-upcoming-ventricular-fibrillation-in-subjects-with-aborted-arrhythmic-sudden-cardiac-death-3-years-follow-up-results
#4
Namsik Yoon, Seo Hong, Aaron Glass, Sung Soo Kim, Min Chul Kim, Jae Yeong Cho, Ki Hong Lee, Doo Sun Sim, Hyun Ju Yoon, Kye Hun Kim, Young Joon Hong, Hyung Wook Park, Ju Han Kim, Youngkeun Ahn, Myung Jeong, Jong Chun Park, Jeong Gwan Cho
Aims: Prolonged Tpeak-Tend interval has been shown to be markers of arrhythmogenesis in various cardiac disorders. However, its dynamicity is one of the obstacles to predict fatal ventricular arrhythmia. This study investigated whether Tpeak-Tend interval during therapeutic hypothermia (TH) is associated with ventricular fibrillation (VF) inducibility and clinical arrhythmia in subjects with aborted arrhythmic sudden cardiac death (SCD). Methods and results: The study group included 31 patients (24 males, age 39...
December 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29219203/automated-qt-analysis-on-holter-monitors-in-pediatric-patients-can-differentiate-long-qt-syndrome-from-controls
#5
Christopher W Follansbee, Lee Beerman, Gaurav Arora
BACKGROUND: Borderline QTc is a common referral to the pediatric cardiology clinic. Evaluation is challenging due to significant overlap of normal and abnormal QTc ranges. We hypothesized that automated QT analysis on Holter could differentiate between patients with long QT syndrome (LQTS) and healthy controls. METHODS: We conducted a retrospective review of 39 patients with known genotype positive, phenotype positive LQTS who underwent Holter monitoring between January 2010 to January 2016...
December 8, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29219167/quantitative-understanding-of-qtc-prolongation-and-gender-as-risk-factors-for-torsade-de-pointes
#6
Lars Johannesen, Christine Garnett, Man Luo, Shari Targum, Jens Stampe Sørensen, Nitin Mehrotra
Several risk factors for development of a potentially fatal ventricular arrhythmia, torsade de pointes, have been observed, including female gender. However, in most investigations, only few torsade events were included and/or rarely were postdose heart rate corrected QT (QTc) measurements included, as a surrogate of drug exposure. We developed a multivariate logistic regression model using data from 22,214 patients (33% women) with 84 torsade events (56% women) to evaluate the relationship between risk factors for torsade using data from four anti-arrhythmic drug development programs...
December 8, 2017: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29217664/incidence-diagnosis-and-management-of-qt-prolongation-induced-by-cancer-therapies-a-systematic-review
#7
REVIEW
Andreu Porta-Sánchez, Cameron Gilbert, Danna Spears, Eitan Amir, Joyce Chan, Kumaraswamy Nanthakumar, Paaladinesh Thavendiranathan
BACKGROUND: The cardiovascular complications of cancer therapeutics are the focus of the burgeoning field of cardio-oncology. A common challenge in this field is the impact of cancer drugs on cardiac repolarization (ie, QT prolongation) and the potential risk for the life-threatening arrhythmia torsades de pointes. Although QT prolongation is not a perfect marker of arrhythmia risk, this has become a primary safety metric among oncologists. Cardiologists caring for patients receiving cancer treatment should become familiar with the drugs associated with QT prolongation, its incidence, and appropriate management strategies to provide meaningful consultation in this complex clinical scenario...
December 7, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29209907/scientific-white-paper-on-concentration-qtc-modeling
#8
REVIEW
Christine Garnett, Peter L Bonate, Qianyu Dang, Georg Ferber, Dalong Huang, Jiang Liu, Devan Mehrotra, Steve Riley, Philip Sager, Christoffer Tornoe, Yaning Wang
The International Council for Harmonisation revised the E14 guideline through the questions and answers process to allow concentration-QTc (C-QTc) modeling to be used as the primary analysis for assessing the QTc interval prolongation risk of new drugs. A well-designed and conducted QTc assessment based on C-QTc modeling in early phase 1 studies can be an alternative approach to a thorough QT study for some drugs to reliably exclude clinically relevant QTc effects. This white paper provides recommendations on how to plan and conduct a definitive QTc assessment of a drug using C-QTc modeling in early phase clinical pharmacology and thorough QT studies...
December 5, 2017: Journal of Pharmacokinetics and Pharmacodynamics
https://www.readbyqxmd.com/read/29209776/hyperoxia-induced-cardiotoxicity-and-ventricular-remodeling-in-type-ii-diabetes-mice
#9
Jennifer Leigh Rodgers, Eva Samal, Subhra Mohapatra, Siva Kumar Panguluri
Hyperoxia, or supplemental oxygen, is regularly used in the clinical setting for critically ill patients in ICU. However, several recent studies have demonstrated the negative impact of this treatment in patients in critical care, including increased rates of lung and cardiac injury, as well as increased mortality. The purpose of this study was to determine the predisposition for arrhythmias and electrical remodeling in a type 2 diabetic mouse model (db/db), as a result of hyperoxia treatment. For this, db/db and their heterozygous controls were treated with hyperoxia (> 90% oxygen) or normoxia (normal air) for 72-h...
December 5, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/29207751/does-azithromycin-and-cetirizine-combination-given-for-upper-respiratory-tract-infections-has-any-significant-effect-on-qtc
#10
Kishor Kumar Rajasekaran, Jayakumar Jeganathan, Pavan Manibettu Raghuram
Introduction: Azithromycin usage in patients with baseline cardiovascular risk is associated with increased risk of cardiovascular mortality, following which Food and Drug Administration (FDA) issued a black box warning regarding safety of azithromycin in patients with cardiovascular morbidity particularly with prolonged QTc. Cetirizine is a second generation anti histaminic and is found to be commonly used for Upper Respiratory Tract Infections (URIs) along with azithromycin on outpatient basis...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29206854/zingerone-alleviates-the-delayed-ventricular-repolarization-and-av-conduction-in-diabetes-effect-on-cardiac-fibrosis-and-inflammation
#11
Hany M El-Bassossy, Wafaa S Al-Thubiani, Ahmed A Elberry, Mohammad I Mujallid, Salah A Ghareib, Ahmad S Azhar, Zainy M Banjar, Malcolm L Watson
BACKGROUND: The study aims to analyse the action of zingerone in diabetes-related cardiac arrhythmias. METHODS: Diabetes was induced by streptozocin while treatment groups received 20 mg/kg zingerone daily. Following extra seven weeks, electrocardiography, extraction of blood, urine and heart for biochemical analysis, histopathology and immunofluorescence were undertaken. RESULTS: The suppression of QT and QTc prolongation in diabetic rats was indicative of prolonged cardiac repolarisation that was greatly reduced by zingerone treatment...
2017: PloS One
https://www.readbyqxmd.com/read/29203211/qtc-interval-cardiovascular-events-and-mortality-in-patients-with-atrial-fibrillation
#12
Andreas Reusser, Steffen Blum, Stefanie Aeschbacher, Lucien Eggimann, Peter Ammann, Paul Erne, Giorgio Moschovitis, Marcello Di Valentino, Dipen Shah, Jürg Schläpfer, Samuel Manser, Tobias Reichlin, Michael Kühne, Christian Sticherling, Stefan Osswald, David Conen
BACKGROUND: A longer QTc interval has been associated with more adverse cardiovascular events and death in the general population. Little evidence is available on these relationships among patients with atrial fibrillation (AF). METHODS: We performed a prospective observational multicenter cohort study of 1413 patients with AF. A resting 12‑lead electrocardiogram (ECG) was performed at baseline. QT interval was corrected for heart rate using the Bazett formula (QTc)...
November 24, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29201344/combinations-of-qtc-prolonging-drugs-towards-disentangling-pharmacokinetic-and-pharmacodynamic-effects-in-their-potentially-additive-nature
#13
Andreas D Meid, Irene Bighelli, Sarah Mächler, Gerd Mikus, Giuseppe Carrà, Mariasole Castellazzi, Claudio Lucii, Giovanni Martinotti, Michela Nosè, Giovanni Ostuzzi, Corrado Barbui, Walter E Haefeli
Background: Whether arrhythmia risks will increase if drugs with electrocardiographic (ECG) QT-prolonging properties are combined is generally supposed but not well studied. Based on available evidence, the Arizona Center for Education and Research on Therapeutics (AZCERT) classification defines the risk of QT prolongation for exposure to single drugs. We aimed to investigate how combining AZCERT drug categories impacts QT duration and how relative drug exposure affects the extent of pharmacodynamic drug-drug interactions...
December 2017: Therapeutic Advances in Psychopharmacology
https://www.readbyqxmd.com/read/29197146/is-myocardial-repolarization-duration-associated-with-repolarization-heterogeneity
#14
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/29194862/a-case-report-is-mexiletine-usage-effective-in-the-shortening-of-qtc-interval-and-improving-the-t-wave-alternans-in-timothy-syndrome
#15
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/29194447/sevoflurane-causes-greater-qtc-interval-prolongation-in-chronically-hyperglycemic-patients-than-in-normoglycemic-patients
#16
Seishi Kimura, Shinichi Nakao, Atsuhiro Kitaura, Tatushige Iwamoto, Kei Houri, Mayuka Matsushima, Shinichi Hamasaki
QTc interval prolongation is a serious diabetic complication and increases mortality rate. Hyperglycemia inhibits the rapid component of delayed rectifier potassium channel currents (Ikr) and prolongs the QTc interval on electrocardiograms. Sevoflurane also inhibits the Ikr and causes QTc interval prolongation. In fact, torsade de pointes occurred in a patient with poorly controlled diabetes mellitus during sevoflurane anesthesia. We enrolled 74 patients, including 37 normoglycemic patients (glycated hemoglobin [HbA1c]: <6...
2017: PloS One
https://www.readbyqxmd.com/read/29185022/change-and-dispersion-of-qt-interval-during-treatment-with-quetiapine-extended-release-versus-aripiprazole-in-children-and-adolescents-with-first-episode-psychosis-results-from-the-tea-trial
#17
Karsten Gjessing Jensen, Stefan Gärtner, Christoph U Correll, Ditte Rudå, Dea Gowers Klauber, Marie Stentebjerg-Olesen, Birgitte Fagerlund, Jens Richardt Jepsen, Anders Fink-Jensen, Klaus Juul, Anne Katrine Pagsberg
OBJECTIVE: The aim of this study was to compare the effect of quetiapine extended release (ER) versus aripiprazole on corrected QT interval (QTc) and QT dispersion (QTd) in youths with first-episode psychosis. METHODS: Youths 12-17 years were randomized to quetiapine ER (daily dose range = 50 to 800 mg) or aripiprazole (daily dose range = 2.5 to 30 mg) in a 12-week double-blinded trial and examined at weeks 0, 4, and 12. Primary outcome was QTc change using Hodges formula (QTcH); secondary outcomes included QTcH > 450 ms, QTcH > 500 ms, QTcH change > 60 ms, QTd, and heart rate (HR)...
November 29, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/29183619/non-sustained-microvolt-level-t-wave-alternans-in-congenital-long-qt-syndrome-types-1-and-2
#18
Jovil A Kannampuzha, Prasanna Sengodan, Sravani Avula, Bartholomew White, Stephen J Ganocy, Peter J Leo, Elizabeth S Kaufman
BACKGROUND: Patients with long QT syndrome (LQTS) are predisposed to polymorphic ventricular tachycardia (VT) during adrenergic stimulation. Microvolt T-wave alternans (MTWA) is linked to vulnerability to VT in structural heart disease. The prevalence of non-sustained MTWA (NS-MTWA) in LQTS is unknown. METHODS: 31 LQT1, 42 LQT2, and 80 controls underwent MTWA testing during exercise. MTWA tests were classified per standardized criteria, and re-analyzed according to the modified criteria to account for NS-MTWA...
November 21, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/29181850/can-nonclinical-repolarization-assays-predict-the-results-of-clinical-thorough-qt-studies-results-from-a-research-consortium
#19
Eunjung Park, Gary A Gintant, Daoqin Bi, Devi Kozeli, Syril D Pettit, Jennifer B Pierson, Matthew Skinner, James Willard, Todd Wisialowski, John Koerner, Jean-Pierre Valentin
BACKGROUND AND PURPOSE: Translation of nonclinical markers of delayed ventricular repolarization to clinical QTc prolongation (a biomarker for Torsades de Pointes proarrhythmia) remains an issue in drug discovery and regulatory evaluations. A retrospective analysis of 150 submitted drug applications in a US-FDA database was conducted to determine the utility of established nonclinical in vitro iKr current (hERG), action potential duration (APD) and in vivo (QTc) repolarization assays to detect and predict clinical QTc prolongation...
November 27, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29178247/isavuconazole-shortens-the-qtc-interval
#20
Sibylle C Mellinghoff, Matteo Bassetti, Daniela Dörfel, Stefan Hagel, Nicola Lehners, Andrzej Plis, Enrico Schalk, Antonio Vena, Oliver A Cornely
BACKGROUND: Isavuconazole is a novel antifungal drug, approved for treatment of adults with invasive aspergillosis and mucormycosis. While azoles as a class effect are known to prolong QTc interval, clinical trials have shown that isavuconazole administration may cause shortening in a dose-related manner. Here, we assessed the effects of isavuconazole on the length of QTc interval. OBJECTIVES: To describe changes of the QTc interval induced by isavuconazole treatment...
November 25, 2017: Mycoses
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