keyword
MENU ▼
Read by QxMD icon Read
search

QT

keyword
https://www.readbyqxmd.com/read/29241054/effect-of-auxiliary-group-for-p-type-organic-dyes-in-nio-based-dye-sensitized-solar-cells-the-first-principal-study
#1
Juan Li, Shijie Zhang, Di Shao, Zhenqing Yang, Wansong Zhang
Auxiliary acceptor groups play a crucial role in D-A-π-A structured organic dyes. In this paper, we designed three D-A-π-A structured organic molecules based on the prototype dye QT-1, named ME18-ME20, and further investigated their electronic and optical properties with density functional theory (DFT) and time-dependent DFT (TDDFT). The calculated results indicate that the scope and intensity of dyes' absorption spectra have some outstanding changes by inserting auxiliary groups. ME20 has not only 152nm redshifts to long wave orientation, but also 78% increased oscillator strength compared to QT-1, and its absorption spectrum broadens region even up to 1400nm...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29240965/clinical-impact-of-repolarization-changes-in-supine-versus-upright-body-position
#2
Susanne Markendorf, Thomas Felix Lüscher, Jin-Hong Gerds-Li, Felix Schönrath, Christian Marc Schmied
BACKGROUND: The impact of postural changes on various electrocardiography (ECG) charac-teristics has only been assessed in a few small studies. This large prospective trial was con-ducted to confirm or refute preliminary data and add important results with immediate impact on daily clinical practice. METHODS: ECGs in supine and upright position from 1028 patients were analyzed. Evaluation was made according to changes in T-wave vector and direction, ST-segment deviation, heart rate, QT interval and QTc interval was performed...
December 14, 2017: Cardiology Journal
https://www.readbyqxmd.com/read/29240450/letter-in-response-to-tp-e-interval-and-tp-e-qt-ratio-before-and-after-catheter-ablation-in-patients-with-premature-ventricular-complexes
#3
Ahmet Korkmaz, Deniz Sahin, Umit Guray
AIM: Recently fragmented QRS (fQRS) on ECG has been introduced as a predictor of myocardial scarring and myocardial ischemia in coronary artery disease. 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 and FFR measurement for intermediate coronary artery stenosis were included in the study...
December 14, 2017: Biomarkers in Medicine
https://www.readbyqxmd.com/read/29239496/two-phase-designs-for-joint-quantitative-trait-dependent-and-genotype-dependent-sampling-in-post-gwas-regional-sequencing
#4
Osvaldo Espin-Garcia, Radu V Craiu, Shelley B Bull
We evaluate two-phase designs to follow-up findings from genome-wide association study (GWAS) when the cost of regional sequencing in the entire cohort is prohibitive. We develop novel expectation-maximization-based inference under a semiparametric maximum likelihood formulation tailored for post-GWAS inference. A GWAS-SNP (where SNP is single nucleotide polymorphism) serves as a surrogate covariate in inferring association between a sequence variant and a normally distributed quantitative trait (QT). We assess test validity and quantify efficiency and power of joint QT-SNP-dependent sampling and analysis under alternative sample allocations by simulations...
December 14, 2017: Genetic Epidemiology
https://www.readbyqxmd.com/read/29236230/gene-patents-in-canada-is-there-a-new-legal-landscape
#5
Katherine L Bonter, Carmela De Luca, Christi J Guerrini
In 2016, the Children's Hospital of Eastern Ontario (CHEO) announced the settlement of its patent lawsuit against US-based Transgenomic, Inc. At issue in the case was CHEO's ability to test for gene mutations associated with long QT syndrome (LQTS) that are described in Transgenomic's patents. CHEO challenged the patents as invalid, and Transgenomic ultimately agreed to license them on a royalty-free basis to CHEO and other healthcare institutions for LQTS testing and research. While widely celebrated in the media, the ethical rhetoric surrounding the settlement has at times obscured the practical and legal context in which it was made and will operate...
December 13, 2017: Molecular Diagnosis & Therapy
https://www.readbyqxmd.com/read/29234865/electromechanical-heterogeneity-in-the-heart-a%C3%A2-key-to-long-qt-syndrome
#6
REVIEW
F F Dressler, J Brado, K E Odening
In the healthy heart, physiological heterogeneities in structure and in electrical and mechanical activity are crucial for normal, efficient excitation and pumping. Alterations of heterogeneity have been linked to arrhythmogenesis in various cardiac disorders such as long QT syndrome (LQTS). This inherited arrhythmia disorder is caused by mutations in different ion channel genes and is characterized by (heterogeneously) prolonged cardiac repolarization and increased risk for ventricular tachycardia, syncope and sudden cardiac death...
December 12, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/29234678/follow-up-measurement-of-corrected-qt-interval-in-adult-patients-before-and-after-lung-transplantation
#7
Dirk Bandorski, Reinhard Hoeltgen, Nicole Becker, Winfried Padberg, Harilaos Bogossian, Christoph Wiedenroth, Matthias Arlt, Christian Hamm, Werner Seeger, Hossein Ardeschir Ghofrani, Matthias Hecker, Henning Gall, Konstantin Mayer
Background: Prolongation of the corrected QT (QTc) interval is well known for many drugs, some of which are an integral part of the therapeutic regimen after lung transplantation (LTX). Therefore, we investigated the QTc interval after LTX in the present study. Patients and Methods: The medical records of patients after LTX were studied for demographic data, indication of LTX, medication, and baseline and follow-up ECGs. The QT interval was corrected for the patient's heart rate using the different formulae of Bazett, Fridericia, Hodges, and Framingham...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29234357/neonatal-arrhythmias-diagnosis-treatment-and-clinical-outcome
#8
REVIEW
Ji-Eun Ban
Arrhythmias in the neonatal period are not uncommon, and may occur in neonates with a normal heart or in those with structural heart disease. Neonatal arrhythmias are classified as either benign or nonbenign. Benign arrhythmias include sinus arrhythmia, premature atrial contraction, premature ventricular contraction, and junctional rhythm; these arrhythmias have no clinical significance and do not need therapy. Supraventricular tachycardia, ventricular tachycardia, atrioventricular conduction abnormalities, and genetic arrhythmia such as congenital long-QT syndrome are classified as nonbenign arrhythmias...
November 2017: Korean Journal of Pediatrics
https://www.readbyqxmd.com/read/29229104/heart-rate-and-risk-of-death-among-patients-with-pulmonary-hypertension-a-12-lead-ecg-analysis
#9
Helene Bouchery-Bardet, Christian Creveuil, Fabrice Bauer, Farzin Beygui, Laure Champ-Rigot, Eric Saloux, Fabien Labombarda, Vincent Roule, Rémi Sabatier, Damien Legallois, Gérard Zalcman, Emmanuel Bergot, Paul Milliez
BACKGROUND: Despite the emergence of new therapies, Pulmonary Hypertension (PH) still has a high mortality. Several clinical, echocardiographic, biological or hemodynamic prognostic factors have been identified but are of limited predictive value for survival. We aimed to assess whether heart rate (HR) and all ECG abnormalities measured on a 12-lead ECG may help to better identify patients at high risk of death in this population. METHODS AND RESULTS: 296 patients followed in a registry were included with all types of PH, except group 2 of the WHO clinical classification...
November 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/29227499/self-discriminating-fluorescent-hybrid-nanocrystals-efficient-and-accurate-tracking-of-translocation-via-oral-delivery
#10
Chengying Shen, Yinqian Yang, Baode Shen, Yike Xie, Jianping Qi, Xiaochun Dong, Weili Zhao, Weifeng Zhu, Wei Wu, Hailong Yuan, Yi Lu
The in vivo fate of nanocrystals is a controversial topic, i.e. dissolving versus integral absorption through the intestinal membrane. This is due to the lack of functional strategies to identify integral nanocrystals. In this study, the in vivo fate of quercetin hybrid nanocrystals (QT-HNCs) via the oral route is explored by physically embedding an environment-responsive probe in the crystal lattices of quercetin. The specific property of the probe is the water-initiated aggregation-caused quenching (ACQ) ability, by which integral QT-HNCs can be self-discriminated...
December 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/29225273/acquired-long-qt-syndrome-mild-but-abnormal
#11
Asami Kashiwa, Takeshi Aiba
No abstract text is available yet for this article.
December 8, 2017: Internal Medicine
https://www.readbyqxmd.com/read/29225104/evaluation-of-qt-dispersion-and-t-peak-to-t-end-interval-in-patients-with-early-stage-sarcoidosis
#12
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/29224980/factors-responsible-for-the-post-slaughter-loss-of-carcass-and-offal-s-in-abattoirs-in-south-africa
#13
Ishmael Festus Jaja, Borden Mushonga, Ezekiel Green, Voster Muchenje
Global demand for food is surging upward due to the expansion of human population. Hence food production and supply need to double with little or no waste to meet this demand. Food loss at any point in the farm to fork chain inhibits the stability of food security at household and national level. A retrospective (AR) and a post mortem meat inspection (PMMI) study to identify major causes of offal and carcass condemnation was conducted in three abattoirs namely, Adeliade, Queenstown and East London abattoirs represented as AD, QT, and EL respectively...
December 7, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29224509/algorithms-used-to-identify-ventricular-arrhythmias-and-sudden-cardiac-death-in-retrospective-studies-a-systematic-literature-review
#14
Yizhou Ye, E Paul Larrat, Aisling R Caffrey
Drug-induced QT interval prolongation may increase the risk of sudden cardiac death or ventricular arrhythmias (SCD/VA), and therefore affects the safety profile of medications. Administrative databases can be used to inform pharmacoepidemiologic drug safety studies for such rare events. In order to compare event rates between studies, validated operational definitions of these events are needed. We conducted a systematic literature review in PubMed to identify algorithms for SCD/VA. Twenty-two studies were included in the review...
December 1, 2017: Therapeutic Advances in Cardiovascular Disease
https://www.readbyqxmd.com/read/29223181/reduced-cardiotoxicity-and-increased-oral-efficacy-of-artemether-polymeric-nanocapsules-in-plasmodium-berghei-infected-mice
#15
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/29221324/the-role-of-sympathectomy-in-long-qt-syndrome
#16
REVIEW
Achilleas Antonopoulos, David Lawrence, Davide Patrini, Marco Scarci, Robert George, Martin Hayward, Sofoklis Mitsos, Nikolaos Panagiotopoulos
Long QT syndrome (LQTS) is an uncommon and potentially fatal cardiac channelopathy. Treatment options can be medical with β-blockers or surgical with implantable cardioverter defibrillator (ICD) implantations and left cardiac sympathetic denervation (LCSD). Purpose of this paper is through a literature review to identify the management algorithm and the role of sympathectomy in LQTS.
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29219203/automated-qt-analysis-on-holter-monitors-in-pediatric-patients-can-differentiate-long-qt-syndrome-from-controls
#17
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
#18
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/29218680/cardiovascular-profile-of-valbenazine-analysis-of-pooled-data-from-three-randomized-double-blind-placebo-controlled-trials
#19
Dao Thai-Cuarto, Christopher F O'Brien, Roland Jimenez, Grace S Liang, Joshua Burke
INTRODUCTION: Valbenazine is a novel vesicular monoamine transporter 2 inhibitor approved for the treatment of tardive dyskinesia in adults. OBJECTIVE: Using data from double-blind, placebo-controlled trials, analyses were conducted to evaluate the cardiovascular effects of once-daily valbenazine in patients with a psychiatric disorder who developed tardive dyskinesia after exposure to a dopamine-blocking medication. METHODS: Data were pooled from three 6-week, double-blind, placebo-controlled trials: KINECT (NCT01688037), KINECT 2 (NCT01733121), and KINECT 3 (NCT02274558)...
December 7, 2017: Drug Safety: An International Journal of Medical Toxicology and Drug Experience
https://www.readbyqxmd.com/read/29218016/synergistic-anti-arrhythmic-effects-in-human-atria-with-combined-use-of-sodium-blockers-and-acacetin
#20
Haibo Ni, Dominic G Whittaker, Wei Wang, Wayne R Giles, Sanjiv M Narayan, Henggui Zhang
Atrial fibrillation (AF) is the most common cardiac arrhythmia. Developing effective and safe anti-AF drugs remains an unmet challenge. Simultaneous block of both atrial-specific ultra-rapid delayed rectifier potassium (K+) current (IKur) and the Na+ current (INa) has been hypothesized to be anti-AF, without inducing significant QT prolongation and ventricular side effects. However, the antiarrhythmic advantage of simultaneously blocking these two channels vs. individual block in the setting of AF-induced electrical remodeling remains to be documented...
2017: Frontiers in Physiology
keyword
keyword
4488
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"