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https://www.readbyqxmd.com/read/29349356/qt-interval-prolongation-due-to-medication-found-in-the-preoperative-evaluation
#1
Mika Seto, Sayo Koga, Ryosuke Kita, Toshihiro Kikuta
QT prolongation is an electrocardiographic change that can lead to lethal arrhythmia. Acquired QT prolongation is known to be caused by drugs and electrolyte abnormalities. We report three cases in which the prolonged QT interval was improved at the time of operation by briefly discontinuing the drugs suspected to have caused the QT prolongation observed on preoperative electrocardiography. The QTc of cases 1, 2, and 3 improved from 518 to 429 ms, 463 to 441 ms, and 473 to 443 ms on discontinuing the use of a gastrointestinal prokinetic agent, a proton pump inhibitor, and a molecular targeted drug, respectively...
December 2017: Journal of Dental Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/29334745/-citalopram-and-qt-prolongation
#2
Štefan Alušík, Zoltán Paluch
In 2011/2012, the US Food and Drug Administration issued a warning about the effect of citalopram on the QT interval and decreased its dosing. Further studies addressing this issue have been published since then. The authors were interested to know whether or not the studies have furnished new information that could modify or further specify the FDA-issued recommendations. After analyzing the most relevant studies, the authors concluded that even papers published within the last 5 years confirmed that, of the SSRI class of drugs, citalopram prolongs the QT interval most significantly...
2018: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/29327653/preparation-and-in-vitro-and-in-vivo-evaluation-of-quercetin-loaded-mixed-micelles-for-oral-delivery
#3
Zhen Lu, Cuiping Bu, Weicheng Hu, Hui Zhang, Mengrui Liu, Meiqi Lu, Guangxi Zhai
Quercetin (QT) is a plant polyphenol with various pharmacological properties. However, the low water solubility limits its therapeutic efficacy. In the present study, QT-loaded sodium taurocholate-Pluronic P123 (QT-loaded ST/P123) mixed micelles were developed and characterized, and the effect of the formulation on improving the water solubility of QT was investigated. QT-loaded ST/P123 mixed micelles were prepared by thin film hydration-direct dissolution and optimized by uniform design. The optimal formulation possessed high drug loading (12...
January 12, 2018: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/29317399/effect-of-a-single-dose-of-i-v-ondansetron-on-qtc-interval-in-emergency-department-patients
#4
Kai Li, Kathy Vo, Byron K Lee, Newton Addo, Zlatan Coralic
PURPOSE: Results of a study to determine whether i.v. administration of a single dose of 4 mg of ondansetron was associated with QT interval prolongation in emergency department (ED) patients are reported. METHODS: In a prospective observational study conducted at an urban academic medical center ED, a convenience sample of adult ED patients treated with ondansetron 4 mg i.v. were enrolled. A 12-lead electrocardiogram (ECG) was obtained immediately before and 5 minutes after ondansetron administration...
January 9, 2018: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/29315692/comprehensive-review-of-cardiovascular-toxicity-of-drugs-and-related-agents
#5
REVIEW
Přemysl Mladěnka, Lenka Applová, Jiří Patočka, Vera Marisa Costa, Fernando Remiao, Jana Pourová, Aleš Mladěnka, Jana Karlíčková, Luděk Jahodář, Marie Vopršalová, Kurt J Varner, Martin Štěrba
Cardiovascular diseases are a leading cause of morbidity and mortality in most developed countries of the world. Pharmaceuticals, illicit drugs, and toxins can significantly contribute to the overall cardiovascular burden and thus deserve attention. The present article is a systematic overview of drugs that may induce distinct cardiovascular toxicity. The compounds are classified into agents that have significant effects on the heart, blood vessels, or both. The mechanism(s) of toxic action are discussed and treatment modalities are briefly mentioned in relevant cases...
January 5, 2018: Medicinal Research Reviews
https://www.readbyqxmd.com/read/29314443/ryanodine-receptor-inhibition-by-dantrolene-effectively-suppresses-ventricular-arrhythmias-in-an-ex-vivo-model-of-long-qt-syndrome
#6
Gerrit Frommeyer, Julius Krawczyk, Christian Ellermann, Nils Bögeholz, Simon Kochhäuser, Dirk G Dechering, Michael Fehr, Lars Eckardt
AIMS: A significant antiarrhythmic potential of ryanodine receptor inhibition was reported in experimental studies. The aim of the present study was to assess potential antiarrhythmic effects of dantrolene in an experimental whole-heart model of drug-induced long-QT syndrome (LQTS). METHODS: In 12 isolated rabbit hearts long-QT-2-syndrome was simulated by infusion of erythromycin (300μM). 12 rabbit hearts were treated with veratridine (0.5μM) to mimic long-QT-3-syndrome...
January 4, 2018: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29311442/usefulness-of-simultaneous-and-sequential-monitoring-of-glucose-level-and-electrocardiogram-in-monkeys-treated-with-gatifloxacin-under-conscious-and-nonrestricted-conditions
#7
Yu Yoshimatsu, Tomomichi Ishizaka, Katsuyoshi Chiba, Kazuhiko Mori
Drug-induced cardiac electrophysiological abnormalities accompanied by hypoglycemia or hyperglycemia increase the risk for life-threatening arrhythmia. To assess the drug-induced cardiotoxic potential associated with extraordinary blood glucose (GLU) levels, the effect of gatifloxacin (GFLX) which was frequently associated with GLU abnormality and QT/QTc prolongations in the clinic on blood GLU and electrocardiogram (ECG) parameters was investigated in cynomolgus monkeys (n=4) given GFLX orally in an ascending dose regimen (10, 30, 60 and 100 mg/kg)...
January 3, 2018: Experimental Animals
https://www.readbyqxmd.com/read/29304859/a-phase-1-evaluation-of-the-pharmacokinetic-pharmacodynamic-interaction-of-the-anti-malarial-agents-kaf156-and-piperaquine
#8
F Joel Leong, Jay Prakash Jain, Yiyan Feng, Budhaditya Goswami, Daniel S Stein
BACKGROUND: KAF156 is a novel imidazolopiperazine anti-malarial with activity against pre-erythrocytic liver stages, asexual and sexual blood stages. Based on in vitro data, a two-way pharmacokinetic interaction was hypothesized for KAF156 use in combination with piperaquine (PPQ) as both drugs are CYP3A4 substrates and inhibitors. Potential combination effects on the QT interval were also assessed. METHODS: This was an open-label, parallel-group, single-dose study in healthy volunteers randomized to three parallel arms (1:1:1) of 800 mg KAF156 + 1280 mg PPQ, 800 mg KAF156 alone and 1280 mg PPQ alone...
January 5, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29304463/management-of-qt-prolongation-induced-by-anti-cancer-drugs-target-therapy-and-old-agents-different-algorithms-for-different-drugs
#9
REVIEW
Carmela Coppola, Anna Rienzo, Giovanna Piscopo, Antonio Barbieri, Claudio Arra, Nicola Maurea
The side effects of anticancer drugs still play a critical role in survival and quality of life. Although the recent progresses of cancer therapies have significantly improved the prognosis of oncologic patients, side effects of antineoplastic treatments are still responsible for the increased mortality of cancer survivors. Cardiovascular toxicity is the most dangerous adverse effect induced by anticancer therapies. A survey conducted by the National Health and Nutrition Examination, showed that 1807 cancer survivors followed up for seven years: 51% died of cancer and 33% of heart disease (Vejpongsa and Yeh, 2014)...
December 6, 2017: Cancer Treatment Reviews
https://www.readbyqxmd.com/read/29298624/approach-to-initiating-qt-prolonging-oncology-drugs-in-the-ambulatory-setting
#10
Mário L de Lemos, Carrie Kung, Victoria Kletas, Nadine Badry, Isabell Kang
Since the introduction of regulatory drug approval guidance on the evaluation of QT interval prolongation, an increasing number of drug monographs has included cautions on the risk of QT prolongation. For example, QT prolongation is mentioned in the Canadian product monographs of 29 drugs commonly seen in oncology practice. This presents two major challenges. First, most guidelines and risk predictive tools for QT prolongation have been developed for hospitalized patients in acute care settings. In contrast, most QT-prolonging oncology drugs are used in medically stable patients in the ambulatory setting...
January 1, 2018: Journal of Oncology Pharmacy Practice
https://www.readbyqxmd.com/read/29290967/modelling-the-effects-of-chloroquine-on-kcnj2-linked-short-qt-syndrome
#11
Cunjin Luo, Kuanquan Wang, Henggui Zhang
A gain-of-function KCNJ2 D172N mutation in KCNJ2-encoded Kir2.1 channels underlies one form of short QT syndrome (SQT3), which is associated with increased susceptibility to arrhythmias and sudden death. Anti-malarial drug chloroquine was reported as an effective inhibitor of Kir2.1 channels. Using biophysically-detailed human ventricle computer models, this study assessed the effects of chloroquine on SQT3. The ten Tusscher et al. model of human ventricular cell action potential was modified to recapitulate functional changes in the inward rectifier K+ current (IK1) due to heterozygous and homozygous forms of the D172N mutation...
December 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/29274391/electrophysiological-characteristics-and-pharmacological-sensitivity-of-two-lines-of-human-induced-pluripotent-stem-cell-derived-cardiomyocytes-coming-from-two-different-suppliers
#12
Sonia Goineau, Vincent Castagné
Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) are increasingly used as preclinical tool for predicting drug-induced QT prolongation and arrhythmias. This study was conducted to assess the electrophysiological characteristics and the pharmacological sensitivity of two commercialized hiPSC-CMs. The baseline electrophysiological characteristics measured with a multi-electrode array (MEA) technology differ between Cor.4U and iCell2: higher beat rate (+32bpm) and shorter field potential duration (FPD, -201ms) for Cor...
December 20, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/29259786/necessity-to-evaluate-pi3k-akt-signalling-pathway-in-proarrhythmia
#13
REVIEW
Martin Ezeani, Sunday Elom
The incidence of QT prolongation and torsades de pointes is on the rise due to the use of cardiovascular and non-cardiovascular drugs. Robust efforts have been made and are still ongoing to understand the underlying mechanisms that can enhance or prevent the development of drug-induced proarrhythmia. A caveat in the use of antiarrhythmic drugs is the ability to obtain safe action potential prolongation therapeutic effects, through IKr blockade. This remains as yet completely unachievable, as blockers of the potassium channel have not provided complete safe measures...
2017: Open Heart
https://www.readbyqxmd.com/read/29259513/torsades-de-pointes-after-ondansetron-infusion-in-2-patients
#14
Danny Y Lee, Tri Trinh, Sion K Roy
Drugs that prolong the electrocardiographic QT interval increase the risk of ventricular arrhythmias, particularly torsades de pointes. Ondansetron, a 5-hydroxytryptamine type 3 receptor antagonist antiemetic, is one such drug. We present the cases of 2 patients who were given intravenous ondansetron and subsequently developed torsades de pointes. Both had normal QT intervals at baseline but were discovered to have risk factors that predisposed them to drug-induced QT prolongation and ventricular arrhythmias...
October 2017: Texas Heart Institute Journal
https://www.readbyqxmd.com/read/29250293/hypothetical-anatomy-of-brugada-phenomenon-long-qt-sine-long-qt-syndrome-implicating-morphologically-undefined-specific-brugada-s-myocells
#15
REVIEW
Petras Stirbys
The Brugada syndrome (BrS) is associated with increased risk of ventricular arrhythmias and sudden cardiac death. It generates genetically mediated arrhythmias posing a true pathophysiological challenge. In search of the similarities between BrS and long QT syndrome some novel insights are suggested. In patients with BrS the duration of QT interval is usually normal. Some investigators have found prolonged QT interval in the syndrome's natural course or the duration of QT segment have been extended by provocative tests unmasking BrS...
April 2017: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/29245320/qtc-prolongation-and-torsades-de-pointes-due-to-a-coadministration-of-fluoxetine-and-amiodarone-in-a-patient-with-implantable-cardioverter-defibrillator-case-report-and-review-of-the-literature
#16
REVIEW
Anhua Wei, Jinlan Peng, Zhichun Gu, Juan Li
RATIONALE: Drug-induced prolongation of the corrected QT interval (QTc) may lead to serious and potentially life-threatening ventricular tachyarrhythmia, such as torsades de pointes (Tdp), which is worthy of clinical attention. Here, we report 1 case of Tdp after a coadministration of fluoxetine and amiodarone. PATIENT CONCERNS: A 62-year-old Chinese male who placed with the implanted cardioverter-defibrillator (ICD) appeared the QTc prolongation and Tdp after the concurrent administration of fluoxetine and amiodarone...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29241490/short-qt-syndrome-and-hydroquinidine-rare-diseases-and-unavailable-drugs
#17
EDITORIAL
Pedro Brugada
No abstract text is available yet for this article.
December 19, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29234678/follow-up-measurement-of-corrected-qt-interval-in-adult-patients-before-and-after-lung-transplantation
#18
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/29224509/algorithms-used-to-identify-ventricular-arrhythmias-and-sudden-cardiac-death-in-retrospective-studies-a-systematic-literature-review
#19
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/29219167/quantitative-understanding-of-qtc-prolongation-and-gender-as-risk-factors-for-torsade-de-pointes
#20
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...
February 2018: Clinical Pharmacology and Therapeutics
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