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QTc prolongation

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https://www.readbyqxmd.com/read/28713157/population-pharmacokinetics-of-moxifloxacin-and-its-concentration-qt-interval-relationship-modeling-in-chinese-healthy-volunteers
#1
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/28712169/analytic-study-in-patients-presenting-to-a-tertiary-care-hospital-regarding-the-artemether-lumefantrine-induced-qtc-interval-changes-in-ecg
#2
Aliena Badshah, Iqbal Haider, Shams Suleman
BACKGROUND: Malaria is one of the most common causes of morbidity and mortality in our part of the world. Artemether-Lumefantrine (AL) Combination therapy is widely used for the treatment of malaria both in outpatients and inpatients hospital settings. Some of the previous anti-malarial were associated with prolongation of QTc interval. Similar query was raised about AL therapy. This study was conducted to determine the risk of QTc interval prolongation in ECG of patients with Falciparum malaria using oral Artemether-Lumefantrine (AL) combination therapy...
January 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/28705229/brugada-syndrome-in-a-patient-with-amyotrophic-lateral-sclerosis-a-case-report
#3
Anusha Battineni, Rohit Gummi, Naresh Mullaguri, Raghav Govindarajan
BACKGROUND: Amyotrophic lateral sclerosis is a fatal neuromuscular disorder characterized by progressive death of the upper and lower motor neurons in the central nervous system. Patients with this disease die mostly as a result of respiratory failure; however, owing to prolonged survival through assisted ventilation, cardiovascular causes are increasingly responsible for mortality. We report what is to the best of our knowledge the first case of type 2 Brugada syndrome causing ventricular tachyarrhythmia and cardiac arrest in a patient with upper limb onset amyotrophic lateral sclerosis...
July 14, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28703024/safety-and-effectiveness-of-physostigmine-a-10-year-retrospective-review
#4
Ann M Arens, Krishna Shah, Suad Al-Abri, Kent R Olson, Tom Kearney
BACKGROUND: Physostigmine has long been recognized as an antidote to reverse anticholinergic delirium. However, its effectiveness, safety profile, and dosing have been disputed. OBJECTIVES: To describe effectiveness, adverse events, and dosing associated with the use of physostigmine to reverse anticholinergic delirium. METHODS: A retrospective cohort study of hospitalized patients reported to a regional poison center system between 2003 and 2012 who received physostigmine to reverse an anticholinergic toxidrome...
July 13, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28696036/cervical-artery-dissection-expands-the-cardiovascular-phenotype-in-fbn1-related-weill-marchesani-syndrome
#5
Kelsey Newell, Wendy Smith, Brian Ghoshhajra, Eric Isselbacher, Angela Lin, Mark E Lindsay
Weill-Marchesani syndrome (WMS) is a rare form of acromelic dysplasia that is characterized by distinctive skeletal, ocular, and cardiovascular abnormalities. Previously described cardiac manifestations of WMS include aortic and pulmonary valve stenosis, mitral valve prolapse, mitral stenosis, and QTc prolongation. Autosomal dominant forms of WMS result from heterozygous pathogenic variants in FBN1, a gene with a well characterized role in the pathogenesis of thoracic aortic aneurysm (TAA) in the context of Marfan syndrome...
July 11, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28695724/contribution-of-medications-and-risk-factors-to-qtc-interval-lengthening-in-the-atherosclerosis-risk-in-communities-aric-study
#6
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/28694782/evaluation-of-abdominal-fetal-electrocardiography-in-early-intrauterine-growth-restriction
#7
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/28693536/hypothermia-induced-alteration-of-repolarization-impact-on-acute-and-long-term-outcome-a-prospective-cohort-study
#8
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
https://www.readbyqxmd.com/read/28687944/prolonged-qtc-indicates-the-clinical-severity-and-poor-prognosis-in-patients-with-isolated-left-ventricular-non-compaction
#9
Hongmei Zhou, Xue Lin, Ligang Fang, Wenlin Zhu, Xihai Zhao, Haiyan Ding, Meng Jiang, Heng Ge, Quan Fang, Ben He
Isolated left ventricular non-compaction (LVNC) is a rare cardiomyopathy that leads to severe clinical complications. This study is to investigate whether or not prolonged QTc is a good indicator for evaluating the severity of fibrosis and predicting the prognosis of LVNC, and if native T1 can be used to quantify the fibrosis. 32 LVNC patients and 14 healthy controls with matched age and sex were examined by CMR and ECG to acquire native T1, QTc interval, and ECG abnormalities. 18 LVNC patients had normal QTc and 14 LVNC patients had prolonged QTc...
July 7, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28679017/a-comparison-of-qtc-intervals-in-alcohol-withdrawal-patients-versus-acute-coronary-syndrome-patients
#10
Timothy Chu, Keith Azevedo, Amy A Ernst, Dusadee Sarangarm, Steven J Weiss
OBJECTIVES: Patients with an alcohol use disorder experiencing acute intoxication or withdrawal may be at risk for electrocardiograph (ECG) abnormalities, including prolongation of repolarization (long QTc [corrected QT]) that may contribute to arrhythmias and may be associated with a threefold increase in the likelihood of sudden cardiac events. Patients with acute coronary syndrome may have prolonged QTc as well. To our knowledge, no previous studies have compared the QTc of ACS with acute ethanol (EtOH) withdrawal syndromes in the emergency department (ED)...
July 2017: Southern Medical Journal
https://www.readbyqxmd.com/read/28668178/cholinergic-symptoms-and-qtc-prolongation-following-donepezil-overdose
#11
A Pourmand, C Shay, W Redha, A Aalam, M Mazer-Amirshahi
Donepezil is the most commonly prescribed acetylcholinesterase inhibitor for the treatment of Alzheimer's disease, an ailment that affects millions of older adult patients. By inhibiting the breakdown of acetylcholine in the central nervous system, donepezil has been shown to slow cognitive decline and improve patients' functional status. While donepezil is well-tolerated and generally considered safe at therapeutic doses, taking more than the prescribed dose could result in adverse cholinergic effects that range from mild gastrointestinal distress to serious cardiac dysrhythmias...
June 22, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28660498/effect-of-degarelix-a-gonadotropin-releasing-hormone-receptor-antagonist-for-the-treatment-of-prostate-cancer-on-cardiac-repolarisation-in-a-randomised-placebo-and-active-comparator-controlled-thorough-qt-qtc-trial-in-healthy-men
#12
Håkan Olsson, Niclas Petri, Lars Erichsen, Anders Malmberg, Lars Grundemar
BACKGROUND AND OBJECTIVES: Degarelix is a gonadotropin-releasing hormone antagonist registered for the treatment of advanced hormone-dependent prostate cancer. Treatment causing androgen deprivation is associated with QT prolongation and this study investigated whether degarelix at supratherapeutic concentrations has an intrinsic effect per se on cardiac repolarisation and the QT interval. METHODS: This was a single-centre, randomised, crossover study comparing the effect of degarelix, placebo, and the positive control moxifloxacin on the QT interval...
June 28, 2017: Clinical Drug Investigation
https://www.readbyqxmd.com/read/28660151/nonalcoholic-fatty-liver-disease-nafld-and-risk-of-cardiac-arrhythmias-a-new-aspect-of-the-liver-heart-axis
#13
REVIEW
Alessandro Mantovani
Nonalcoholic fatty liver disease (NAFLD) is a pathologic condition frequently observed in clinical practice. To date, the prevalence of NAFLD is approximately 25-30% among adults of the general population in Western countries but increases to approximately 70-75% among patients with type 2 diabetes mellitus. In the last decade, accumulating evidence has clearly demonstrated that patients with NAFLD have not only an increased liver-related morbidity and mortality but also an increased risk of fatal and non-fatal cardiovascular events...
June 28, 2017: Journal of Clinical and Translational Hepatology
https://www.readbyqxmd.com/read/28659221/qtc-interval-in-patients-with-schizophrenia-receiving-antipsychotic-treatment-as-monotherapy-or-polypharmacy
#14
Anja Elliott, Thibault Johan Mørk, Mikkel Højlund, Thomas Christensen, Rasmus Jeppesen, Nikolaj Madsen, Anne Grethe Viuff, Peter Hjorth, Jens Cosedis Nielsen, Povl Munk-Jørgensen
OBJECTIVE: Antipsychotics are associated with a polymorphic ventricular tachycardia, torsades de pointes, which, in the worst case, can lead to sudden cardiac death. The QT interval corrected for heart rate (QTc) is used as a clinical proxy for torsades de pointes. The QTc interval can be prolonged by antipsychotic monotherapy, but it is unknown if the QTc interval is prolonged further with antipsychotic polypharmaceutical treatment. Therefore, this study investigated the associations between QTc interval and antipsychotic monotherapy and antipsychotic polypharmaceutical treatment in schizophrenia, and measured the frequency of QTc prolongation among patients...
June 29, 2017: CNS Spectrums
https://www.readbyqxmd.com/read/28654209/sensitivity-and-reliability-of-halothane-anaesthetized-microminipigs-to-assess-risk-of-drug-induced-long-qt-syndrome
#15
Xin Cao, Takeshi Wada, Yuji Nakamura, Suchitra Matsukura, Hiroko Izumi-Nakaseko, Kentaro Ando, Atsuhiko T Naito, Atsushi Sugiyama
Using moxifloxacin and terfenadine, which are known to induce benign and malignant QT interval prolongation, respectively, we analysed whether halothane-anaesthetized microminipigs are an appropriate model for assessing the risk of drug-induced long QT syndrome. Moxifloxacin (0.03, 0.3 and 3 mg/kg) and terfenadine (0.03, 0.3 and 3 mg/kg) were intravenously infused over 10 min. with a pause of 20 min. to the halothane-anaesthetized microminipigs (n=4 for each drug). Moxifloxacin decreased the heart rate, whereas it increased the blood pressure in a dose-related manner...
June 27, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28646979/inhibition-of-rapid-delayed-rectifier-potassium-current-ikr-by-ischemia-reperfusion-and-its-recovery-by-vitamin-e-in-ventricular-myocytes
#16
Yaoxu Chen, Chunxia Yin, Yingying Yang, Zhuo Fan, Jinling Shang, Wen Tan
Ischemia/reperfusion (I/R) induces prolongation of QT interval and action potential duration (APD), which is a major cardiac electrical disorder in patients with arrhythmias. However, the mechanism of QT interval prolongation induced by I/R remains unclear. In the present study, we hypothesized that the rapid component of delayed rectifier potassium (IKr) channel plays an important role in I/R-induced QT interval prolongation. We observed a marked attenuation of IKr and a significant prolongation of action potential duration (APD) in a simulated I/R system with sodium dithionite (Na2S2O4) in ventricular myocytes of guinea pigs...
July 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28646025/remodeling-of-repolarization-and-arrhythmia-susceptibility-in-a-myosin-binding-protein-c-knockout-mouse-model
#17
Amir Toib, Chen Zhang, Giulia Borghetti, Xiaoxiao Zhang, Markus Wallner, Yijun Yang, Constantine Troupes, Hajime Kubo, Thomas Sharp, Eric Feldsott, Remus M Berretta, Neil Zalavadia, Danielle Trappanese, Shavonn Harper, Polina Gross, Xiongwen Chen, Sadia Mohsin, Steven Houser
Hypertrophic cardiomyopathy (HCM) is one of the most common genetic cardiac diseases and amongst the leading causes of sudden cardiac death (SCD) in the young. The cellular mechanisms leading to SCD in HCM are not well known. Prolongation of the action potential duration (APD) is a common feature predisposing hypertrophied hearts to SCD. Previous studies have explored the roles of inward Na(+) and Ca(2+) in the development of HCM, but the role of repolarizing K(+) currents have not been defined. The objective of this study was to characterize the arrhythmogenic phenotype and cellular electrophysiological properties of mice with HCM, induced by Myosin Binding Protein C (MyBPC) Knockout (KO) and to test the hypothesis that remodeling of repolarizing K(+) currents cause APD prolongation in MyBPC KO myocytes...
June 23, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28638571/prevalence-of-qt-prolongation-and-associated-lvef-changes-in-diabetic-patients-over-a-four-year-retrospective-time-period
#18
Zhongju Lu, Lloyd Lense, Mohit Sharma, Ankit Shah, Ying Luu, Lucien Cardinal, Joan Faro, Alan Kaell
Aim: To evaluate the prevalence and longitudinal changes of prolonged QTc in DM patients admitted to our community hospital, and to determine, if any, its correlation with changes of left ventricular ejection fraction (LVEF). Methods: A retrospective chart review of patients with Type 1 (T1DM) and Type 2 (T2DM) with at least two admissions during a four-year period was performed to identify QTc interval, and LVEF, as measured on transthoracic echocardiogram. Changes in QTc and LVEF between patient hospital admissions were compared...
March 2017: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/28634852/incidence-of-prolonged-qtc-and-severe-hypoglycemia-in-type-1-diabetes-the-eurodiab-prospective-complications-study
#19
Cristina Amione, Sara Giunti, Paolo Fornengo, Sabita S Soedamah-Muthu, Nish Chaturvedi, J H Fuller, Federica Barutta, Gabriella Gruden, Graziella Bruno
AIMS: To assess the independent role of severe hypoglycemia on 7-year cumulative incidence of prolonged QTc in a large cohort of patients with type 1 diabetes. METHODS: People with type 1 diabetes recruited by the EURODIAB Prospective Complications Study who had normal QTc were examined at baseline and after 7 years with standardized methods (n = 1415; mean age ± SD 32.1 ± 9.6 years; diabetes duration 14.2 ± 8.8 years). Hypoglycemic episodes were assessed by a questionnaire...
June 20, 2017: Acta Diabetologica
https://www.readbyqxmd.com/read/28634649/assessment-of-cabozantinib-treatment-on-qt-interval-in-a-phase-3-study-in-medullary-thyroid-cancer-evaluation-of-indirect-qt-effects-mediated-through-treatment-induced-changes-in-serum-electrolytes
#20
Dale R Miles, Steven A Lacy, David R Wada, Steve Milwee, Yifah Yaron, Linh T Nguyen
PURPOSE: This study evaluated factors impacting QTc interval in a phase 3 trial of cabozantinib in progressive, metastatic, medullary thyroid cancer (MTC). METHODS: Electrocardiogram (12-lead ECG) measurements were obtained at screening, and at pre-dose, and 2, 4, and 6 h post-dose on Days 1 and 29 in a phase 3 study in patients with MTC treated with cabozantinib (140 mg/day). Central tendency analyses were conducted on baseline-corrected QTc values. Linear and nonlinear mixed-effects models were used to evaluate potential factors affecting the QTc interval, including serum electrolytes, patient demographics, and cabozantinib concentration...
June 20, 2017: Cancer Chemotherapy and Pharmacology
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