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QTc prolongation

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https://www.readbyqxmd.com/read/29166279/influence-of-long-term-oral-application-of-quinolones-on-the-ecg-curve-in-dogs
#1
A Cepiel, A Noszczyk-Nowak, A Cekiera, J Popiel, U Pasławska
The aim of the study was to analyse the influence of enrofloxacin and pradofloxacin administered orally for 14 days on the ECG in dogs. The ECG was performed before and after a 14 day period of quinolone administration. There was an increase in the QTc and the TpTe interval in the group treated with quinolones. QTc was prolonged by 24 ms (p=0.001). The TpTe interval was shortened, on average, by 6.55 ms (p=0.048). In the group treated with enrofloxacin, QTc was prolonged by 16.27 ms (p=0.006) and the TpTe interval was shortened by 9...
September 26, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29145929/ciprofloxacin-does-not-prolong-the-qtc-interval-a-clinical-study-in-icu-patients-and-review-of-the-literature
#2
Charlotte Heemskerk, Evelien Woldman, Marieke Pereboom, Ruud Van der Hoeven, Aukje Mantel-Teeuwisse, Claudia Van Gemeren, Matthijs Lambertus Becker
PURPOSE: Ciprofloxacin may prolong the QT interval and increase the risk of Torsade de Pointes (TdP). Intravenous administration of ciprofloxacin in patients with additional risks may elevate the risk of QTc interval prolongation. We prospectively assessed whether intravenous ciprofloxacin prolongs the QT interval in patients with additional co-morbidities and risk factors. We also reviewed the literature on the QT prolonging effect or TdP inducing effect of ciprofloxacin. METHODS: ICU Patients who were treated with intravenous ciprofloxacin as part of their therapy were recruited...
2017: Journal of Pharmacy & Pharmaceutical Sciences: a Publication of the Canadian Society for Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29144549/zuclopenthixol-dihydrochloride-for-schizophrenia
#3
REVIEW
Edward J Bryan, Marie Ann Purcell, Ajit Kumar
BACKGROUND: Oral zuclopenthixol dihydrochloride (Clopixol) is an anti-psychotic treatment for people with psychotic symptoms, especially those with schizophrenia. It is associated with neuroleptic malignant syndrome, a prolongation of the QTc interval, extra-pyramidal reactions, venous thromboembolism and may modify insulin and glucose responses. OBJECTIVES: To determine the effects of zuclopenthixol dihydrochloride for treatment of schizophrenia. SEARCH METHODS: We searched the Cochrane Schizophrenia Group's Trials Register (latest search 09 June 2015)...
November 16, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29133566/use-of-pharmacokinetic-and-pharmacodynamic-analyses-to-determine-the-optimal-fixed-dosing-regimen-of-iclaprim-for-treatment-of-serious-gram-positive-infections
#4
Thomas Lodise, John Bosso, Colleen Kelly, Paul J Williams, James R Lane, David B Huang
Iclaprim is a bacterial dihydrofolate reductase inhibitor that is currently being evaluated in two Phase 3 trials for the treatment of patients with acute bacterial skin and skin structure infections (ABSSSI). Prior animal infection models studies suggest that the pharmacokinetic and pharmacodynamics (PK/PD) drivers for efficacy are area under the curve from 0-24 hours at steady state (AUC0-24hss), AUC/minimum inhibitory concentration (MIC), and time above the MIC during the dosing interval (T > MIC) while QTc prolongation was associated to maximal concentration at steady state (Cmaxss) in a thorough QTc Phase 1 study...
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29133066/-qtc-interval-in-the-neonatal-period-in-a-mexican-population-a-pilot-study
#5
Rocio Alejandra Peña-Juárez, Adrián Garcia-Canales, Luis Martin Garrido-García, Cesar Augusto Valerio-Carballo
INTRODUCTION: QT interval prolongation is associated with ventricular arrhythmias and sudden death syndrome. OBJECTIVE: To determine the value of QTc interval in healthy newborns in a general hospital in Jalisco, Mexico, and their outcome during their first months of life. METHODS: The study included healthy newborns from March to November 2016, in the Hospital General of Occidente in Jalisco, Mexico. A 12-lead electrocardiogram was performed at a speed of 25mm/s during the first 48h of life...
November 10, 2017: Archivos de Cardiología de México
https://www.readbyqxmd.com/read/29121758/tpeak-tend-dispersion-as-a-predictor-for-malignant-arrhythmia-events-in-patients-with-vasospastic-angina
#6
Wang Xianpei, Wu Sha, Gao Chuanyu, Yan Juanjuan, Chen Chong, Shi Yongen, Feng Yu, Lin Zhenhao
BACKGROUND: Tpeak-Tend interval (Tp-e interval) in electrocardiogram (ECG) has been reported to predict malignant arrhythmia events (MAE) in ST-segment elevation myocardial infarction and ion channelopathy. Tp-e interval and other ECG parameters as predictors for MAE was evaluated in patients with vasospastic angina (VA). METHODS AND RESULTS: Sixty-two patients with VA (Non-MAE group) and 20 patients with VA complicated by MAE (MAE group) were enrolled in our Division of Cardiology between January 2010 and December 2015...
December 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29121487/risk-of-cardiac-events-in-long-qt-syndrome-patients-when-taking-antiseizure-medications
#7
David S Auerbach, Yitschak Biton, Bronislava Polonsky, Scott McNitt, Robert A Gross, Robert T Dirksen, Arthur J Moss
Many antiseizure medications (ASMs) affect ion channel function. We investigated whether ASMs alter the risk of cardiac events in patients with corrected QT (QTc) prolongation. The study included people from the Rochester-based Long QT syndrome (LQTS) Registry with baseline QTc prolongation and history of ASM therapy (n = 296). Using multivariate Anderson-Gill models, we assessed the risk of recurrent cardiac events associated with ASM therapy. We stratified by LQTS genotype and predominant mechanism of ASM action (Na(+) channel blocker and gamma-aminobutyric acid modifier...
October 20, 2017: Translational Research: the Journal of Laboratory and Clinical Medicine
https://www.readbyqxmd.com/read/29118998/association-of-qt-interval-with-mortality-by-kidney-function-results-from-the-national-health-and-nutrition-examination-survey-nhanes
#8
Rehan Malik, Sehrish Waheed, Deepak Parashara, Jorge Perez, Salman Waheed
Objective: Prolonged QT interval predisposes to ventricular arrhythmias and sudden cardiac death. However, the association between QT interval and mortality by the level of pre-existing kidney function has not been investigated. Methods: We followed 6565 participants from the National Health and Nutrition Examination Survey III for a median of 13.3 years. Sample divided according to corrected QT (QTc) interval was as follows: normal (QTc <450 ms for men and <460 ms for women) or prolonged...
2017: Open Heart
https://www.readbyqxmd.com/read/29118886/polymorphic-ventricular-tachycardia-secondary-to-subarachnoid-haemorrhage-a-rare-occurrence-in-the-setting-of-normal-qtc
#9
Siddharth Paresh Shah, Priyanka Pitroda, Kinner Patel, Rahul Chandak, Timothy Ford
Subarachnoid hemorrhage (SAH) is a neurologic emergency associated with high mortality rate. Polymorphic ventricular tachycardia (VT) is a rare arrhythmia. It can occur in any setting of a long QT interval and bradycardia. This may result from a cardiomyopathy (both ischemic and non-ischemic), acute coronary ischemia, congenital long QT syndrome, electrolyte disturbances and cerebrovascular diseases. We report a rare case of polymorphic VT of unclear etiology with a normal corrected QT, likely secondary to SAH...
October 2017: Cardiology Research
https://www.readbyqxmd.com/read/29107482/prevalence-and-outcome-of-high-risk-qt-prolongation-recorded-in-the-emergency-department-from-an-institution-wide-qt-alert-system
#10
Heather N Anderson, J Martijn Bos, Kristina H Haugaa, Bruce W Morlan, Robert F Tarrell, Pedro J Caraballo, Michael J Ackerman
BACKGROUND: QT prolongation is an independent risk factor for sudden death, stroke, and all-cause mortality. However, additional studies have shown that in certain settings, QT prolongation may be transient and a result of external factors. OBJECTIVE: In this study, we evaluated the clinical characteristics and outcomes of patients seen in the emergency department (ED) with QT prolongation. METHODS: Between November 2010 and June 2011, 7522 patients had an electrocardiogram (ECG) obtained during their evaluation in the ED...
October 26, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29104235/assessment-of-prescribing-and-monitoring-habits-for-patients-taking-an-antiarrhythmic-and-concomitant-qtc-prolonging-antibiotic
#11
Kelsey Noss, Sandra M Aguero, Travis Reinaker
Patients may intermittently require antimicrobial therapy with a QTc-prolonging antibiotic, which presents a challenge for prescribers of patients already taking a QTc-prolonging antiarrhythmic. Manufacturers recommend close monitoring for evidence of QTc-prolongation with the concomitant use of QTc-prolonging medications, but the monitoring parameters are not well-defined. Previous studies recommend a surveillance electrocardiogram (EKG) be completed both before and after the initiation of QTc-prolonging medications, but it is unknown to what degree EKGs displaying the QTc-interval are used to alter physician order entry and pharmacist order verification during concomitant therapy...
November 1, 2017: Pharmacy (Basel, Switzerland)
https://www.readbyqxmd.com/read/29101013/the-congenital-long-qt-syndrome-type-3-an-update
#12
REVIEW
Andrés Ricardo Pérez-Riera, Raimundo Barbosa-Barros, Rodrigo Daminello Raimundo, Marianne Penachini da Costa de Rezende Barbosa, Isabel Cristina Esposito Sorpreso, Luiz Carlos de Abreu
Congenital long QT syndrome type 3 (LQT3) is the third in frequency compared to the 15 forms known currently of congenital long QT syndrome (LQTS). Cardiac events are less frequent in LQT3 when compared with LQT1 and LQT2, but more likely to be lethal; the likelihood of dying during a cardiac event is 20% in families with an LQT3 mutation and 4% with either an LQT1 or an LQT2 mutation. LQT3 is consequence of mutation of gene SCN5A which codes for the Nav1.5 Na(+) channel α-subunit and electrocardiographically characterized by a tendency to bradycardia related to age, prolonged QT/QTc interval (mean QTc value 478 ± 52 ms), accentuated QT dispersion consequence of prolonged ST segment, late onset of T wave and frequent prominent U wave because of longer repolarization of the M cell across left ventricular wall...
October 31, 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29095573/severity-and-multiplicity-of-microvascular-complications-are-associated-with-qt-interval-prolongation-in-patients-with-type-2-diabetes
#13
Shunsuke Kobayashi, Mototsugu Nagao, Akira Asai, Izumi Fukuda, Shinichi Oikawa, Hitoshi Sugihara
AIMS/INTRODUCTION: A prolonged QT interval plays a causal role in life-threatening arrhythmia and becomes a risk factor for sudden cardiac death. Here, we assessed the association between microvascular complications and the QT interval in patients with type 2 diabetes. MATERIALS AND METHODS: Patients with type 2 diabetes (n = 219) admitted to our hospital for glycemic control were enrolled. QT interval was measured manually in lead II on the electrocardiogram and corrected for heart rate using Bazett's formula (QTc)...
November 2, 2017: Journal of Diabetes Investigation
https://www.readbyqxmd.com/read/29092657/the-impact-of-cirrhosis-and-prescription-medications-on-qtc-interval-before-and-after-liver-transplantation
#14
Andrew D Santeusanio, Kevin G Dunsky, Stephanie Pan, Thomas D Schiano
BACKGROUND: Higher rates of corrected QT (QTc) prolongation have been reported in patients with cirrhosis. The impact of liver transplantation and prescription medications on the natural history of QTc prolongation has yet to be well characterized. METHODS: This was a single-center review of patients receiving (group 1) or listed for (group 2) a liver transplant during 2014. Patients in group 1 were followed prospectively from the date of transplantation to assess rates of QTc normalization posttransplant...
January 1, 2017: Journal of Pharmacy Practice
https://www.readbyqxmd.com/read/29091143/the-effects-of-cigarette-smoking-on-ventricular-repolarization-in-adolescents
#15
Seyma Kayali, Fadime Demir
OBJECTIVE: To assess the association between cigarette smoking and ventricular arrhythmias in adolescents. Novel electrocardiographic parameters -Tp-e interval, as well as Tpe/QT and Tpe/QTc ratios - were used to make this assessment. METHODS: The study population consisted of 87 subjects aged between 16-19 years. Fifty-one adolescent smokers with no risk of arrhythmia comprised the Smoker Group, and 36 adolescents who had never smoked cigarettes comprised the Control Group...
July 2017: Einstein
https://www.readbyqxmd.com/read/29080970/ibrutinib-does-not-prolong-the-corrected-qt-interval-in-healthy-subjects-results-from-a-thorough-qt-study
#16
Jan de Jong, Peter Hellemans, James Juhui Jiao, Yuhan Huang, Sofie Mesens, Juthamas Sukbuntherng, Daniele Ouellet
PURPOSE: Ibrutinib is an orally administered, irreversible Bruton's tyrosine kinase inhibitor for treatment of B-cell malignancy. This study evaluated the effects of single-dose ibrutinib at therapeutic and supratherapeutic exposures on cardiac repolarization in healthy subjects. METHODS: Part 1 used an open-label, two-period sequential design to assess the safety and pharmacokinetics of single doses of ibrutinib 840 and 1680 mg in eight subjects. Part 2 was a randomized, placebo- and positive (moxifloxacin)-controlled, double-blind, single dose, four-way cross-over study to assess the effect of ibrutinib (840 and 1680 mg) on QT/QTc interval...
October 28, 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/29073767/arterial-stiffness-is-associated-with-qtc-interval-prolongation-in-patients-with-heart-failure
#17
Salah Al-Zaiti, Samir Saba, Rodolfo Pike, Jennifer Williams, Fadi Khraim
BACKGROUND: A prolonged corrected QT (QTc) interval is a known risk factor for adverse cardiac events. Understanding the determinants and physiologic correlates of QTc is necessary for selecting proper strategies to reduce the risk of adverse events in high-risk patients. We sought to evaluate the role of arterial stiffness in heart failure as a determinant of QTc prolongation. METHOD: This was an observational study that recruited ambulatory heart failure patients (New York Heart Association Classes I-II) from an outpatient heart failure clinic...
January 1, 2017: Biological Research for Nursing
https://www.readbyqxmd.com/read/29071820/application-of-multigene-panel-sequencing-in-patients-with-prolonged-rate-corrected-qt-interval-and-no-pathogenic-variants-detected-in-kcnq1-kcnh2-and-scn5a
#18
Soo Hyun Seo, So Yeon Kim, Sung Im Cho, Hyunwoong Park, Seungjun Lee, Jong Moon Choi, Man Jin Kim, Jee Soo Lee, Kyung Jin Ahn, Mi Kyoung Song, Eun Jung Bae, Sung Sup Park, Moon Woo Seong
Long QT syndrome (LQTS) is an inherited cardiac disease characterized by a prolonged heart rate-corrected QT (QTc) interval. We investigated the genetic causes in patients with prolonged QTc intervals who were negative for pathogenic variants in three major LQTS-related genes (KCNQ1, KCNH2, and SCN5A). Molecular genetic testing was performed using a panel including 13 LQTS-related genes and 67 additional genes implicated in other cardiac diseases. Overall, putative genetic causes of prolonged QTc interval were identified in three of the 30 patients (10%)...
January 2018: Annals of Laboratory Medicine
https://www.readbyqxmd.com/read/29059465/what-is-old-is-new-again-delafloxacin-a-modern-fluoroquinolone
#19
Jonathan C Cho, Matthew P Crotty, Bryan P White, Marylee V Worley
Delafloxacin is a new fluoroquinolone antimicrobial approved for the treatment of acute bacterial skin and skin structure infections (ABSSSIs) in adults using dosage regimens of 300 mg intravenously every 12 hours, 450 mg orally every 12 hours, or switching from intravenous to oral regimens for a 5 to 14 day treatment duration. Dosage adjustments in patients with severe renal dysfunction (estimated glomerular filtration rate [eGFR] = 15-29 ml/min/1.73m(2) ) are not required for oral doses but should be decreased to 200 mg intravenously every 12 hours in patients requiring parenteral therapy...
October 23, 2017: Pharmacotherapy
https://www.readbyqxmd.com/read/29058821/a-thorough-qt-study-to-evaluate-the-effects-of-supratherapeutic-doses-of-ledipasvir-on-the-qtc-interval-in-healthy-subjects
#20
Polina German, Anita Mathias, Diana M Brainard, Qinghua Song, John Ling, Brian P Kearney
This study evaluated the effect of supratherapeutic exposure of the anti-HCV drug ledipasvir on the QTc interval in healthy subjects. Sixty healthy volunteers were randomized to receive twice-daily blinded ledipasvir (120 mg) or placebo, administered for 10 days each, or single doses of open-label moxifloxacin (400 mg). Serial plasma samples for ledipasvir concentration analysis were collected after each treatment. Triplicate time-matched electrocardiograms were collected at baseline and after each treatment...
October 23, 2017: Clinical Pharmacology in Drug Development
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