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QTc interval

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https://www.readbyqxmd.com/read/28078208/influence-of-different-second-generation-antipsychotics-on-the-qtc-interval-a-pragmatic-study
#1
Roy E Olsen, Rune A Kroken, Sigmund Bjørhovde, Kristina Aanesen, Hugo A Jørgensen, Else-Marie Løberg, Erik Johnsen
AIM: To investigate whether differential influence on the QTc interval exists among four second generation antipsychotics (SGAs) in psychosis. METHODS: Data were drawn from a pragmatic, randomized head-to-head trial of the SGAs risperidone, olanzapine, quetiapine, and ziprasidone in acute admissions patients with psychosis, and with follow-up visits at discharge or maximally 6-9 wk, 3, 6, 12 and 24 mo. Electrocardiograms were recorded on all visits. To mimic clinical shared decision-making, the patients were randomized not to a single drug, but to a sequence of the SGAs under investigation...
December 22, 2016: World Journal of Psychiatry
https://www.readbyqxmd.com/read/28067212/estimation-of-the-qt-rr-relation-trade-off-between-goodness-of-fit-and-extrapolation-accuracy
#2
Alain Vinet, Bruno Dubé, Réginald Nadeau, Omar Mahiddine, Vincent Jacquemet
Correction of the QT interval in the ECG for changes in heart rate (RR interval) is needed to compare groups of patients and assess the risk of sudden cardiac death. The QTc represents the QT interval at 60 bpm, although most patients typically have a faster heart rate, thus requiring extrapolation of the QT-RR relationship. This paper investigates the ability of QT-RR models with increasing number of parameters to fit beat-to-beat variations in the QT interval and provide a reliable estimate of the QTc. One-, two- and three-parameter functions generalising the Bazett and Fridericia formulas were used in combination with hysteresis reduction (memory) obtained by time-averaging the history of RR intervals with exponentially-decaying weights...
January 9, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28065822/detecting-drug-induced-changes-in-ecg-parameters-using-jacketed-telemetry-effect-of-different-data-reduction-techniques
#3
Matthew Skinner, Guozhen Xing, Jing Lu, Jin Ren, Karen Oldman
INTRODUCTION: Continuous cardiovascular data is routinely collected during preclinical safety assessment of new medicines. This generates large datasets, which must be summarised to analyse and interpret drug effects. We assessed four methods of data reduction of continuous electrocardiogram (ECG) data and examined the impact on the statistical power of the assay. METHODS: Continuous ECG data were collected from a validation study in 6 cynomolgus monkeys using jacketed telemetry...
January 5, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28041716/early-repolarization-pattern-in-the-general-population-prevalence-and-associated-factors
#4
Guo-Zhe Sun, Ning Ye, Yin-Tao Chen, Ying Zhou, Zhao Li, Ying-Xian Sun
OBJECTIVES: To evaluate the prevalence of early repolarization pattern (ERP) in the general rural Chinese population and identify the contributing risk factors. METHODS: A cross-sectional study of 11,956 permanent residents of Liaoning Province ≥35y of age was conducted between January and August 2013 (response rate 85.3%). ERP was diagnosed if there was J-point elevation of ≥0.1mV in ≥2 leads in the inferior (II, III, aVF) or lateral (I, aVL, V4-6) territory, or both...
December 19, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28039282/relationships-of-measured-and-genetically-determined-height-with-the-cardiac-conduction-system-in-healthy-adults
#5
Thomas Kofler, Sébastien Thériault, Matthias Bossard, Stefanie Aeschbacher, Selina Bernet, Philipp Krisai, Steffen Blum, Martin Risch, Lorenz Risch, Christine M Albert, Guillaume Paré, David Conen
BACKGROUND: Increasing height is an independent risk factor for atrial fibrillation, but the underlying mechanisms are unknown. We hypothesized that height-related differences in electric conduction could be potential mediators of this relationship. METHODS AND RESULTS: We enrolled 2149 adults aged 25 to 41 years from the general population. Height was directly measured, and a resting 12-lead ECG obtained under standardized conditions. Multivariable linear regression models were used to evaluate the association between measured height and ECG parameters...
January 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28030806/a-phase-1-dose-escalation-study-of-the-oral-histone-deacetylase-inhibitor-abexinostat-in-combination-with-standard-hypofractionated-radiotherapy-in-advanced-solid-tumors
#6
Eric Deutsch, Elizabeth Cohen-Jonathan Moyal, Vanesa Gregorc, Paolo Andrea Zucali, Jean Menard, Jean-Charles Soria, Ioana Kloos, Jeff Hsu, Ying Luan, Emily Liu, Remus Vezan, Thorsten Graef, Sofia Rivera
Current treatments for advanced solid tumors tend to be only palliative. Although radiotherapy is administered with a curative intent, radioresistance and dose-limiting toxicities pose limitations to treatment. Abexinostat, an oral pan-histone deacetylase inhibitor, demonstrated enhanced sensitivity to radiation in various solid tumor cell lines. We conducted an exploratory, phase 1, dose-escalation study of abexinostat in combination with standard hypofractionated radiotherapy in patients with advanced solid tumors treated in a palliative setting...
December 24, 2016: Oncotarget
https://www.readbyqxmd.com/read/28024277/qt-prolongation-caused-by-insulin-induced-hypoglycaemia-an-interventional-study-in-119-individuals
#7
Stella Kacheva, Beate Karges, Katrin Göller, Nikolaus Marx, Karl Mischke, Wolfram Karges
AIMS: Hypoglycaemia is associated with increased risk of cardiovascular events and mortality in patients with diabetes, but the extent and mechanisms of this link are ill defined. We here prospectively studied cardiac repolarization abnormalities during insulin-induced hypoglycaemia in humans. METHODS: 119 individuals (69 males, age 47.5±13.4years, range 18-82years) were assessed during hypoglycaemia after the injection of 0.1-0.25units/kg human insulin. Corrected QT intervals (QTc) and QT dispersion (QTd) were calculated from serially recorded twelve lead electrocardiograms, and plasma glucose and other endocrine markers were studied...
December 3, 2016: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/28018155/neonatal-toxicity-from-escitalopram-use-in-utero-a-case-report
#8
Jessica Degiacomo, Sherry Luedtke
Selective serotonin reuptake inhibitor (SSRI) exposure during pregnancy can result in symptoms of serotonin syndrome or serotonin withdrawal. In contrast to other SSRIs, reports of serotonin behavioral syndrome following in utero exposure to escitalopram and citalopram are limited. We describe a case of suspected toxicity following in utero exposure to 20 mg escitalopram throughout pregnancy. The infant was transferred to our neonatal intensive unit at 9 hours of life for further evaluation of lethargy, weak cry, bradycardia, and non-reactive pupils...
November 2016: Journal of Pediatric Pharmacology and Therapeutics: JPPT: the Official Journal of PPAG
https://www.readbyqxmd.com/read/28012118/risk-factors-for-qtc-prolongation-systematic-review-of-the-evidence
#9
Eline Vandael, Bert Vandenberk, Joris Vandenberghe, Rik Willems, Veerle Foulon
Background QTc-interval prolongation has been associated with serious adverse events, such as Torsade de Pointes and sudden cardiac death. In the prevention of QTc-prolongation, special attention should go to high-risk patients. Aim of the review The aim of this review is to summarize and assess the evidence for different risk factors for QTc-prolongation (demographic factors, comorbidities, electrolytes, QTc-prolonging medication). Methods Potential studies were retrieved based on a systematic search of articles published until June 2015 in the databases Medline and Embase...
December 23, 2016: International Journal of Clinical Pharmacy
https://www.readbyqxmd.com/read/28009315/differences-in-ecg-characteristics-and-co-morbidities-among-patients-who-underwent-elective-surgical-repair
#10
I Botchorishvili, N Sharashidze, N Pargalava, Z Pagava, G Saatashvili
The aim of the study was to assess differences in ECG features and prevalence of comorbidies between two groups of patiens: with Abdominal Aortic Aneurism (AAA) and Aorto-Iliac Occlusive Desieses-Lerish Syndrome (LS). Data was collected for all consecutive adult patients who underwent elective surgical repair of AAA (fusiform aneurysm) or LS at "The Center of Vascular and Heart Diseases" (Tbilisi, Georgia) between 2010 and 2014. We studied a prevalence of Arterial Hypertension (AHT); Diabetes mellitus (DM); Renal Failure (RF),Peripheral Artery Disease (PAD), Coronary Artery Disease (CAD) and rate of coronary revascularization in these patients; We also, investigate some of the electrocariographic characteristics: Corrected QT interval(QTC),QT dispersion(QTD)...
November 2016: Georgian Medical News
https://www.readbyqxmd.com/read/28008350/safety-profile-of-lamotrigine-in-overdose
#11
REVIEW
Akintunde Alabi, Adam Todd, Andrew Husband, Joe Reilly
BACKGROUND: Lamotrigine is an anticonvulsant as well as a mood stabilizer. Apart from its established use in the treatment of epilepsy, there has been an expansion of its use in the treatment of mental disorders. Patients with epilepsy as well as those with mental disorders are at increased risk of deliberate drug overdoses. An evidence base for the safety profile of lamotrigine in overdose is an essential tool for prescribers. The objective of this study was to carry out a narrative synthesis of the existing evidence for the safety profile of lamotrigine in overdose...
December 2016: Therapeutic Advances in Psychopharmacology
https://www.readbyqxmd.com/read/28008301/iloperidone-in-the-treatment-of-schizophrenia-an-evidence-based-review-of-its-place-in-therapy
#12
REVIEW
Fernanda S Tonin, Astrid Wiens, Fernando Fernandez-Llimos, Roberto Pontarolo
INTRODUCTION: Schizophrenia is a chronic and debilitating mental disorder that affects the patient's and their family's quality of life, as well as financial costs and health care settings. Despite the variety of available antipsychotics, optimal treatment outcomes are not always achieved. Novel drugs, such as iloperidone, can provide more effective, tolerable and safer strategies. AIM: To review the evidence for the clinical impact of iloperidone on the treatment of patients with schizophrenia...
2016: Core Evidence
https://www.readbyqxmd.com/read/28007571/multiple-nickel-sensitive-targets-elicit-cardiac-arrhythmia-in-isolated-mouse-hearts-after-pituitary-adenylate-cyclase-activating-polypeptide-mediated-chronotropy
#13
Etienne E Tevoufouet, Erastus N Nembo, Fabian Distler, Felix Neumaier, Jürgen Hescheler, Filomain Nguemo, Toni Schneider
The pituitary adenylate cyclase-activating polypeptide (PACAP)-27 modulates various biological processes, from the cellular level to function specification. However, the cardiac actions of this neuropeptide are still under intense studies. Using control (+|+) and mice lacking (-|-) either R-type (Cav2.3) or T-type (Cav3.2) Ca(2+) channels, we investigated the effects of PACAP-27 on cardiac activity of spontaneously beating isolated perfused hearts. Superfusion of PACAP-27 (20nM) caused a significant increase of baseline heart frequency in Cav2...
December 19, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28007031/comparative-safety-and-effectiveness-of-serotonin-receptor-antagonists-in-patients-undergoing-chemotherapy-a-systematic-review-and-network-meta-analysis
#14
Andrea C Tricco, Erik Blondal, Areti Angeliki Veroniki, Charlene Soobiah, Afshin Vafaei, John Ivory, Lisa Strifler, Roberta Cardoso, Emily Reynen, Vera Nincic, Huda Ashoor, Joanne Ho, Carmen Ng, Christy Johnson, Erin Lillie, Jesmin Antony, Derek J Roberts, Brenda R Hemmelgarn, Sharon E Straus
BACKGROUND: Although serotonin (5-HT3) receptor antagonists are effective in reducing nausea and vomiting, they may be associated with increased cardiac risk. Our objective was to examine the comparative safety and effectiveness of 5-HT3 receptor antagonists (e.g., dolasetron, granisetron, ondansetron, palonosetron, tropisetron) alone or combined with steroids for patients undergoing chemotherapy. METHODS: We searched MEDLINE, Embase, and the Cochrane Central Register of Controlled Trials from inception until December 2015 for studies comparing 5-HT3 receptor antagonists with each other or placebo in chemotherapy patients...
December 23, 2016: BMC Medicine
https://www.readbyqxmd.com/read/28003052/population-pharmacokinetic-pharmacodynamic-analysis-to-compare-the-effect-of-moxifloxacin-on-qt-interval-prolongation-between-healthy-korean-and-japanese-subjects
#15
Hyang-Ki Choi, Jin Ah Jung, Tomoe Fujita, Hideki Amano, Jong-Lyul Ghim, Dong-Hwan Lee, Kenichi Tabata, Il-Dae Song, Mika Maeda, Yuji Kumagai, Boaz Mendzelevski, Jae-Gook Shin
PURPOSE: The goal of this study was to evaluate the moxifloxacin-induced QT interval prolongation in healthy male and female Korean and Japanese volunteers to investigate interethnic differences. METHODS: This multicenter, randomized, double-blind, placebo-controlled, 2-way crossover study was conducted in healthy male and female Korean and Japanese volunteers. In each period, a single dose of moxifloxacin or placebo 400 mg was administered orally under fasting conditions...
December 2016: Clinical Therapeutics
https://www.readbyqxmd.com/read/28002167/haloperidol-versus-ondansetron-for-treatment-of-established-nausea-and-vomiting-following-general-anesthesia-a-randomized-clinical-trial
#16
Vanda G Yazbeck-Karam, Sahar M Siddik-Sayyid, Hanane B Barakat, Serge Korjian, Marie T Aouad
BACKGROUND: Haloperidol is an antipsychotic. At low doses, it is a useful agent for the prophylaxis of postoperative nausea and vomiting (PONV). However, its use for treating established PONV has not been well studied. METHODS: This randomized double-blinded trial tested whether haloperidol is noninferior to ondansetron for the early treatment of established PONV in adult patients undergoing general anesthesia. The primary outcome is whether patients were PONV free during the first 4 hours...
December 19, 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/27995684/comparing-qt-interval-variability-of-semiautomated-and-high-precision-ecg-methodologies-in-seven-thorough-qt-studies-implications-for-the-power-of-studies-intended-for-definitive-evaluation-of-a-drug-s-qt-effect
#17
Karin Meiser, Pierre Jordaan, Sasha Latypova, Borje Darpo
BACKGROUND: In studies of drug effects on electrocardiographic parameters, the level of precision in measuring QTc interval changes will influence a study's ability to detect small effects. METHODS: Variability data from investigational, placebo and moxifloxacin treatments from seven thorough QT studies performed by the same sponsor were analyzed with the objective to compare the performance of two commonly used approaches for ECG interval measurements: semiautomated (SA) and the high-precision QT (HPQT) analysis...
December 19, 2016: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/27992261/effects-of-testosterone-replacement-on-electrocardiographic-parameters-in-men-findings-from-two-randomized-trials
#18
Thiago Gagliano-Jucá, Tevhide Betül İçli, Karol M Pencina, Zhuoying Li, John Tapper, Grace Huang, Thomas G Travison, Panayiotis Tsitouras, S Mitchell Harman, Thomas W Storer, Shalender Bhasin, Shehzad Basaria
CONTEXT: Endogenous testosterone levels have been negatively associated with QTc interval in small case series; the effects of testosterone therapy on electrocardiographic parameters have not been evaluated in randomized trials. OBJECTIVE: To evaluate the effects of testosterone replacement on corrected QT interval (QTcF) in two randomized controlled trials. PARTICIPANTS: Men with pre- and post-randomization electrocardiograms (ECGs) from the Testosterone and Pain (TAP) and the Testosterone Effects on Atherosclerosis in Aging Men (TEAAM) Trials...
December 19, 2016: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27990843/impact-of-qt-interval-prolongation-following-antiarrhythmic-drug-therapy-on-left-ventricular-function
#19
Konstantinos Chouchoulis, John Chiladakis, Nikolaos Koutsogiannis, Periklis Davlouros, Maria Kaza, Dimitrios Alexopoulos
AIM: We assessed whether antiarrhythmic drug-induced QT interval prolongation affects left ventricular function. METHODS: Study population included 54 patients with symptomatic recent onset atrial fibrillation spontaneously cardioverted to sinus rhythm. Electrocardiographic and echocardiographic studies were done before initiating and after achieving drug's steady state. RESULTS: Significantly prolonged corrected QT interval (QTc) was noticed following only sotalol and amiodarone...
January 2017: Future Cardiology
https://www.readbyqxmd.com/read/27984328/sex-differences-in-the-effect-of-atomoxetine-on-the-qt-interval-in-adult-patients-with-attention-deficit-hyperactivity-disorder
#20
Yutaro Suzuki, Misuzu Tajiri, Atsunori Sugimoto, Naoki Orime, Taketsugu Hayashi, Jun Egawa, Takuro Sugai, Yoshimasa Inoue, Toshiyuki Someya
BACKGROUND: The effects of atomoxetine on QT in adults remain unclear. In this study, we examined whether the use of atomoxetine to treat attention-deficit hyperactivity disorder in adults is associated with QT prolongation. METHODS: Forty-one subjects with attention-deficit hyperactivity disorder were enrolled in this study. Participants were administered 40, 80, or 120 mg atomoxetine daily and were maintained on their respective dose for at least 2 weeks. We conducted electrocardiographic measurements and blood tests, measuring plasma atomoxetine concentrations after treatment...
February 2017: Journal of Clinical Psychopharmacology
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