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https://www.readbyqxmd.com/read/28720088/sex-is-a-moderator-of-the-association-between-nos1ap-sequence-variants-and-qtc-in-two-long-qt-syndrome-founder-populations-a-pedigree-based-measured-genotype-association-analysis
#1
Annika Winbo, Eva-Lena Stattin, Ida Maria Westin, Anna Norberg, Johan Persson, Steen M Jensen, Annika Rydberg
BACKGROUND: Sequence variants in the NOS1AP gene have repeatedly been reported to influence QTc, albeit with moderate effect sizes. In the long QT syndrome (LQTS), this may contribute to the substantial QTc variance seen among carriers of identical pathogenic sequence variants. Here we assess three non-coding NOS1AP sequence variants, chosen for their previously reported strong association with QTc in normal and LQTS populations, for association with QTc in two Swedish LQT1 founder populations...
July 18, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/28719597/pharmacogenomics-study-of-thiazide-diuretics-and-qt-interval-in-multi-ethnic-populations-the-cohorts-for-heart-and-aging-research-in-genomic-epidemiology
#2
A A Seyerle, C M Sitlani, R Noordam, S M Gogarten, J Li, X Li, D S Evans, F Sun, M A Laaksonen, A Isaacs, K Kristiansson, H M Highland, J D Stewart, T B Harris, S Trompet, J C Bis, G M Peloso, J A Brody, L Broer, E L Busch, Q Duan, A M Stilp, C J O'Donnell, P W Macfarlane, J S Floyd, J A Kors, H J Lin, R Li-Gao, T Sofer, R Méndez-Giráldez, S R Cummings, S R Heckbert, A Hofman, I Ford, Y Li, L J Launer, K Porthan, C Newton-Cheh, M D Napier, K F Kerr, A P Reiner, K M Rice, J Roach, B M Buckley, E Z Soliman, R de Mutsert, N Sotoodehnia, A G Uitterlinden, K E North, C R Lee, V Gudnason, T Stürmer, F R Rosendaal, K D Taylor, K L Wiggins, J G Wilson, Y-DI Chen, R C Kaplan, K Wilhelmsen, L A Cupples, V Salomaa, C van Duijn, J W Jukema, Y Liu, D O Mook-Kanamori, L A Lange, R S Vasan, A V Smith, B H Stricker, C C Laurie, J I Rotter, E A Whitsel, B M Psaty, C L Avery
Thiazide diuretics, commonly used antihypertensives, may cause QT interval (QT) prolongation, a risk factor for highly fatal and difficult to predict ventricular arrhythmias. We examined whether common single-nucleotide polymorphisms (SNPs) modified the association between thiazide use and QT or its component parts (QRS interval, JT interval) by performing ancestry-specific, trans-ethnic and cross-phenotype genome-wide analyses of European (66%), African American (15%) and Hispanic (19%) populations (N=78 199), leveraging longitudinal data, incorporating corrected standard errors to account for underestimation of interaction estimate variances and evaluating evidence for pathway enrichment...
July 18, 2017: Pharmacogenomics Journal
https://www.readbyqxmd.com/read/28714380/loperamide-and-cardiac-events-is-high-dose-use-still-safe-for-chemotherapy-induced-diarrhea
#3
Mário L de Lemos, Jolene Guenter, Victoria Kletas
High-dose loperamide is often used for the acute management of chemotherapy-induced diarrhea, with a maximum daily dosing of up to 24 mg. Recently, the US Food and Drug Administration has issued a warning that loperamide can cause rare serious cardiac events, including QT prolongation, torsades de pointes, cardiac arrest and death. Most events were reported in patients taking very high doses for an extended period of time. Daily intake ranged from 64 mg to 1600 mg, often continuously for weeks or months...
January 1, 2017: Journal of Oncology Pharmacy Practice
https://www.readbyqxmd.com/read/28713157/population-pharmacokinetics-of-moxifloxacin-and-its-concentration-qt-interval-relationship-modeling-in-chinese-healthy-volunteers
#4
Feng-Yan Xu, Ji-Han Huang, Ying-Chun He, Li-Yu Liang, Lu-Jin Li, Juan Yang, Fang Yin, Ling Xu, Qing-Shan Zheng, Kun Wang
Moxifloxacin (MX) is an 8-methoxyquinolone antimicrobial drug, which is often used as a positive control in thorough QT (TQT) studies. In the present study we established the population pharmacokinetics model of MX and the relationship of MX concentrations with the QT and various corrected QT (QTc) intervals, and compared the results with other ethnicities. The MX data used for modeling were obtained from a published TQT interval prolongation study of antofloxacin with MX as the positive control. In this four-period crossover study, 24 adult Chinese healthy volunteers received either 200 or 400 mg of oral antofloxacin once daily, 400 mg of MX, or a placebo...
July 17, 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/28712074/efficacy-and-safety-of-shp465-mixed-amphetamine-salts-in-the-treatment-of-attention-deficit-hyperactivity-disorder-in-adults-results-of-a-randomized-double-blind-placebo-controlled-forced-dose-clinical-study
#5
Richard H Weisler, Michael Greenbaum, Valerie Arnold, Ming Yu, Brian Yan, Margo Jaffee, Brigitte Robertson
OBJECTIVE: The objective of this randomized, double-blind, placebo-controlled study was to evaluate the efficacy and safety of SHP465 mixed amphetamine salts (MAS) in adults with attention-deficit/hyperactivity disorder (ADHD). METHODS: Eligible adults [aged 18-55 years; meeting the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition ADHD criteria; baseline ADHD Rating Scale with Adult Prompts (ADHD-RS-AP) total scores ≥28] were randomized 1:1:1 to placebo or forced-dose SHP465 MAS (12...
July 15, 2017: CNS Drugs
https://www.readbyqxmd.com/read/28711156/towards-a-structural-view-of-drug-binding-to-herg-k-channels
#6
REVIEW
Jamie I Vandenberg, Eduardo Perozo, Toby W Allen
The human ether-a-go-go-related gene (hERG) K(+) channel is of great medical and pharmaceutical relevance. Inherited mutations in hERG result in congenital long-QT syndrome which is associated with a markedly increased risk of cardiac arrhythmia and sudden death. hERG K(+) channels are also remarkably susceptible to block by a wide range of drugs, which in turn can cause drug-induced long-QT syndrome and an increased risk of sudden death. The recent determination of the near-atomic resolution structure of the hERG K(+) channel, using single-particle cryo-electron microscopy (cryo-EM), provides tremendous insights into how these channels work...
July 12, 2017: Trends in Pharmacological Sciences
https://www.readbyqxmd.com/read/28711067/pa-6-inhibits-inward-rectifier-currents-carried-by-v93i-and-d172n-gain-of-function-kir2-1-channels-but-increases-channel-protein-expression
#7
Yuan Ji, Marlieke G Veldhuis, Jantien Zandvoort, Fee L Romunde, Marien J C Houtman, Karen Duran, Gijs van Haaften, Eva-Maria Zangerl-Plessl, Hiroki Takanari, Anna Stary-Weinzinger, Marcel A G van der Heyden
BACKGROUND: The inward rectifier potassium current IK1 contributes to a stable resting membrane potential and phase 3 repolarization of the cardiac action potential. KCNJ2 gain-of-function mutations V93I and D172N associate with increased IK1, short QT syndrome type 3 and congenital atrial fibrillation. Pentamidine-Analogue 6 (PA-6) is an efficient (IC50 = 14 nM with inside-out patch clamp methodology) and specific IK1 inhibitor that interacts with the cytoplasmic pore region of the KIR2...
July 15, 2017: Journal of Biomedical Science
https://www.readbyqxmd.com/read/28710299/takotsubo-cardiomyopathy-related-complete-heart-block-and-torsades-de-pointes
#8
Faisal Inayat, Hafeez Ul Hassan Virk, Waqas Ullah, Iqra Riaz
Takotsubo cardiomyopathy (TCM) is a relatively recently recognised clinical entity. It frequently mimics acute coronary syndrome and is accompanied by reversible left ventricular apical ballooning in the absence of angiographically significant coronary artery stenosis. TCM is a reversible condition, and the prognosis is usually well. However, in rare instances, it can be associated with life-threatening arrhythmic complications. Herein, we report the case of a patient with TCM who developed complete atrioventricular block followed by QT prolongation and torsades de pointes...
July 14, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28708197/risk-stratification-personalised-model-for-prediction-of-life-threatening-ventricular-tachyarrhythmias-in-patients-with-chronic-heart-failure
#9
Alexander Vladimirovich Frolov, Tatjana Gennadjevna Vaikhanskaya, Olga Petrovna Melnikova, Anatoly Pavlovich Vorobiev, Ludmila Michajlovna Guel
BACKGROUND: The development of prognostic factors of life-threatening ventricular tachyarrhythmias (VTA) and sudden cardiac death (SCD) continues to maintain its priority and relevance in cardiology. The development of a method of personalised prognosis based on multifactorial analysis of the risk factors associated with life-threatening heart rhythm disturbances is considered a key research and clinical task. AIM: To design a prognostic and mathematical model to define personalised risk for life-threatening VTA in patients with chronic heart failure (CHF)...
2017: Kardiologia Polska
https://www.readbyqxmd.com/read/28705431/-effect-of-intermittent-variable-intensity-exercise-on-qt-variation-and-risk-of-sudden-cardiac-death-among-cameroonian-school-adolescents
#10
E C Bika Lele, M N Pepouomi, A Temfemo, J Mekoulou, P Assomo Ndemba, S H Mandengue
INTRODUCTION: Several cases of sudden deaths are observed among students practicing sport and physical activity (SPA). Just few studies have been carried out on the variation of the QT (interval) and risk of sudden death during sporting exercises. AIM: To determine the effect of variable intermittent stress intensity on the variation of QT and the risk of sudden cardiac death. PATIENTS AND METHODS: Form 4, lower sixth and upper sixth students were recruited from a high school in Douala (Cameroon)...
July 10, 2017: Annales de Cardiologie et D'angéiologie
https://www.readbyqxmd.com/read/28703360/model-averaging-for-robust-assessment-of-qt-prolongation-by-concentration-response-analysis
#11
A G Dosne, M Bergstrand, M O Karlsson, D Renard, G Heimann
Assessing the QT prolongation potential of a drug is typically done based on pivotal safety studies called thorough QT studies. Model-based estimation of the drug-induced QT prolongation at the estimated mean maximum drug concentration could increase efficiency over the currently used intersection-union test. However, robustness against model misspecification needs to be guaranteed in pivotal settings. The objective of this work was to develop an efficient, fully prespecified model-based inference method for thorough QT studies, which controls the type I error and provides satisfactory test power...
July 13, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28699784/cancer-drugs-and-qt-prolongation-weighing-risk-against-benefit
#12
Pierantonio Menna, Emanuela Salvatorelli, G Minotti
No abstract text is available yet for this article.
July 12, 2017: Expert Opinion on Drug Safety
https://www.readbyqxmd.com/read/28699261/npq-t-a-chlorophyll-fluorescence-parameter-for-rapid-estimation-and-imaging-of-non-photochemical-quenching-of-excitons-in-photosystem-ii-associated-antenna-complexes
#13
Stefanie Tietz, Christopher C Hall, Jeffrey A Cruz, David M Kramer
In photosynthesis, light energy is absorbed by light-harvesting complexes and used to drive photochemistry. However, a fraction of absorbed light is lost to non-photochemical quenching (NPQ) that reflects several important photosynthetic processes to dissipate excess energy. Currently, estimates of NPQ and its individual components (qE , qI , qZ and qT ) are measured from pulse-amplitude-modulation (PAM) measurements of chlorophyll fluorescence yield and require measurements of the maximal yield of fluorescence in fully dark-adapted material (Fm ), when NPQ is assumed to be negligible...
August 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28699125/uptake-of-predictive-genetic-testing-and-cardiac-evaluation-for-children-at-risk-for-an-inherited-arrhythmia-or-cardiomyopathy
#14
Susan Christian, Joseph Atallah, Robin Clegg, Michael Giuffre, Cathleen Huculak, Tara Dzwiniel, Jillian Parboosingh, Sherryl Taylor, Martin Somerville
Predictive genetic testing in minors should be considered when clinical intervention is available. Children who carry a pathogenic variant for an inherited arrhythmia or cardiomyopathy require regular cardiac screening and may be prescribed medication and/or be told to modify their physical activity. Medical genetics and pediatric cardiology charts were reviewed to identify factors associated with uptake of genetic testing and cardiac evaluation for children at risk for long QT syndrome, hypertrophic cardiomyopathy or arrhythmogenic right ventricular cardiomyopathy...
July 11, 2017: Journal of Genetic Counseling
https://www.readbyqxmd.com/read/28697043/vasomotor-hot-flashes-and-cardiac-repolarization-a-randomized-placebo-controlled-trial-of-postmenopausal-hormone-therapy
#15
Hanna Lantto, Petri Haapalahti, Matti Viitasalo, Heikki Väänänen, Anssi R A Sovijärvi, Olavi Ylikorkala, Tomi S Mikkola
OBJECTIVE: The aim of the study was to compare the effects of different hormone therapies on cardiac repolarization in recently postmenopausal women with and without hot flashes. METHODS: We recruited 150 healthy women: 72 with and 78 without hot flashes. They were randomized and treated for 6 months with transdermal estradiol (1 mg/day), oral estradiol (OE) alone (2 mg/day) or combined with medroxyprogesterone acetate (MPA; 5 mg/day), or placebo. Cardiac repolarization was assessed by measuring QT intervals, rate-dependence of QT-end interval, and T waves from 24-hour electrocardiographic recording before and during hormone therapy, comprising a total of over 20 million QT-interval measurements...
July 10, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/28695724/contribution-of-medications-and-risk-factors-to-qtc-interval-lengthening-in-the-atherosclerosis-risk-in-communities-aric-study
#16
Khalid A Alburikan, Ahmed Aldemerdash, Samuel T Savitz, James E Tisdale, Eric A Whitsel, Elsayed Z Soliman, Emily M Thudium, Carla A Sueta, Anna M Kucharska-Newton, Sally C Stearns, Jo E Rodgers
RATIONALE, AIMS, AND OBJECTIVES: Prolongation of the corrected QT (QTc) interval is associated with increased morbidity and mortality. The association between QTc interval-prolonging medications (QTPMs) and risk factors with magnitude of QTc interval lengthening is unknown. We examined the contribution of risk factors alone and in combination with QTPMs to QTc interval lengthening. METHOD: The Atherosclerosis Risk in Communities study assessed 15 792 participants with a resting, standard 12-lead electrocardiogram and ≥1 measure of QTc interval over 4 examinations at 3-year intervals (1987-1998)...
July 10, 2017: Journal of Evaluation in Clinical Practice
https://www.readbyqxmd.com/read/28695570/population-pharmacokinetics-and-electrocardiographic-effects-of-dihydroartemisinin-piperaquine-in-healthy-volunteers
#17
Palang Chotsiri, Thanaporn Wattanakul, Richard Hoglund, Borimas Hanboonkunupakarn, Sasithon Pukrittayakamee, Daniel Blessborn, Podjanee Jittamala, Nicholas J White, Nicholas P J Day, Joel Tarning
AIMS: The aims of the presented study were to evaluate the pharmacokinetic properties of dihydroartemisinin and piperaquine, potential drug-drug interactions with concomitant primaquine treatment, and piperaquine effects on the electrocardiogram in healthy volunteers. METHODS: Population pharmacokinetic properties of dihydroartemisinin and piperaquine were assessed in 16 in healthy Thai adults using an open-label randomized crossover study. Drug concentration-time data and electrocardiographic measurements were evaluated with nonlinear mixed-effects modelling...
July 11, 2017: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28694782/evaluation-of-abdominal-fetal-electrocardiography-in-early-intrauterine-growth-restriction
#18
Clarissa L Velayo, Kiyoe Funamoto, Joyceline Noemi I Silao, Yoshitaka Kimura, Kypros Nicolaides
Objectives: This descriptive study was performed to evaluate the capability of a non-invasive transabdominal electrocardiographic system to extract clear fetal electrocardiographic (FECG) measurements from intrauterine growth restricted (IUGR) fetuses and to assess whether abdominal FECG parameters can be developed as markers for evaluating the fetal cardiac status in IUGR. Methods: Transabdominal FECG was attempted in 20 controls and 15 IUGR singleton pregnancies at 20+0-33+6 weeks gestation. Standard ECG parameters were compared between the study groups and evaluated for their correlation...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28694394/assessment-of-electrocardiographic-parameters-in-adult-patients-undergoing-extracorporeal-shockwave-lithotripsy
#19
Gündüz Durmuş, Muhsin Kalyoncuoğlu, Mehmet Baran Karataş, Yiğit Çanga, Semi Öztürk, Ender Özal, Yasin Çakıllı, Tuncay Kırış, Barış Güngör, Ahmet Taha Alper, Mehmet Mustafa Can, Osman Bolca
OBJECTIVE: Extracorporeal shock wave lithotripsy (ESWL) is a safe and effective treatment for urinary tract calculi. While serious side effects are rare, transient cardiac arrhythmias may occur. New electrocardiographic (ECG) parameters, such as P wave dispersion (PWD), QT dispersion (QTd), T peak to T end (Tp-e) interval, Tp-e interval/QT ratio, and Tp-e interval/corrected QT ratio have been defined to help predict atrial and ventricular arrhythmias. However, effect of ESWL on these ECG parameters has not been previously investigated...
July 2017: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
https://www.readbyqxmd.com/read/28693536/hypothermia-induced-alteration-of-repolarization-impact-on-acute-and-long-term-outcome-a-prospective-cohort-study
#20
Sophie von Ulmenstein, Christian Storm, Thomas G K Breuer, Sebastian Lask, Philipp Attanasio, Andreas Mügge, Alexander Wutzler
BACKGROUND: The effects of target temperature management (TTM) on the heart aren't thoroughly studied yet. Several studies showed the prolongation of various ECG parameters including Tpeak-Tend-time under TTM. Our study's goal is to evaluate the acute and long-term outcome of these prolongations. METHODS: In this study we included patients with successful resuscitation after cardiac arrest who were admitted to the Charité Virchow Klinikum Berlin or the Heart and Vascular Centre of the Ruhr University Bochum between February 2006 and July 2013 (Berlin) or May 2014 to November 2015 (Bochum)...
July 11, 2017: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
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