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Prolong Qt

Seon Ah Cha, Jae Seung Yun, Tae Seok Lim, Yoon Goo Kang, Kang Min Lee, Ki Ho Song, Ki Dong Yoo, Yong Moon Park, Seung Hyun Ko, Yu Bae Ahn
BACKGROUND: We investigated an association between baseline heart rate-corrected QT (QTc) interval before severe hypoglycemia (SH) and prolongation of QTc interval during SH in patients with type 2 diabetes mellitus (T2DM). METHODS: Between January 2004 and June 2014, 208 patients with T2DM, who visited the emergency department because of SH and underwent standard 12-lead electrocardiography within the 6-month period before SH were consecutively enrolled. The QTc interval was analyzed during the incidence of SH, and 6 months before and after SH...
October 5, 2016: Diabetes & Metabolism Journal
Worawan B Limpitikul, Ivy E Dick, David Tester, Nicole J Boczek, Pattraranee Limphong, Wanjun Yang, Myoung Hyun Choi, Jennifer Babich, Deborah DiSilvestre, Ronald J Kanter, Gordon F Tomaselli, Michael J Ackerman, David Yue
RATIONALE: Calmodulinopathies comprise a new category of potentially life-threatening genetic arrhythmia syndromes capable of producing severe long QT syndrome (LQTS) with mutations involving either CALM1, CALM2, or CALM3 The underlying basis of this form of LQTS is a disruption of Ca(2+)/CaM-dependent inactivation (CDI) of L-type Ca(2+) channels (LTCCs). OBJECTIVE: To gain insight into the mechanistic underpinnings of calmodulinopathies and devise new therapeutic strategies for the treatment of this form of LQTS...
October 20, 2016: Circulation Research
Abdunoor M Kabanywanyi, Rita Baiden, Ali M Ali, Muhidin K Mahende, Bernhards R Ogutu, Abraham Oduro, Halidou Tinto, Margaret Gyapong, Ali Sie, Esperanca Sevene, Eusebio Macete, Seth Owusu-Agyei, Alex Adjei, Guillaume Compaoré, Innocent Valea, Isaac Osei, Abena Yawson, Martin Adjuik, Raymond Akparibo, Mwaka A Kakolwa, Salim Abdulla, Fred Binka
The antimalarial drug piperaquine is associated with delayed ventricular depolarization, causing prolonged QT interval (time taken for ventricular de-polarisation and re-polarisation). There is a lack of safety data regarding dihydroartemisinin/piperaquine (DHA/PPQ) for the treatment of uncomplicated malaria, which has limited its use. We created a platform where electrocardiograms (ECG) were performed in public hospitals for the safety assessment of DHA/PPQ, at baseline before the use of dihydroartemisinin/piperaquine (Eurartesim®), and on day 3 (before and after administration of the final dose) and day 7 post-administration...
2016: PloS One
Jie Wu, Wei-Guang Ding, Minoru Horie
Long QT syndrome type 1 (LQT1) is a subtype of a congenital cardiac syndrome caused by mutation in the KCNQ1 gene, which encodes the α-subunit of the slow component of delayed rectifier K(+) current (IKs) channel. Arrhythmias in LQT1 are characterized by prolongation of the QT interval on ECG, as well as the occurrence of life-threatening cardiac events, frequently triggered by adrenergic stimuli (e.g., physical or emotional stress). During the past two decades, much advancement has been made in understanding the molecular pathogenesis underlying LQT1...
October 2016: Journal of Arrhythmia
Altuğ Ösken, Nizamettin Selçuk Yelgeç, Regayip Zehir, Tuğba Kemaloğlu Öz, Selçuk Yaylacı, Ramazan Akdemir, Hüseyin Gündüz
Drug-induced torsades de pointes (TdP) is a rare but potentially fatal adverse effect of commonly prescribed medications including cardiac and noncardiac drugs. Importantly, many drugs have been reported to cause the characteristic Brugada syndrome-linked electrocardiography (ECG) abnormalities and/or (fatal) ventricular tachyarrhythmias. Chlorpheniramine and propranolol have the arrhythmogenic effects reported previously. A review of literature revealed a large number of case reports of chlorpheniramine or propranolol use resulting in QTc prolongation, TdP, or both...
July 2016: Indian Journal of Pharmacology
Tomomichi Ishizaka, Yu Yoshimatsu, Yu Maeda, Wataru Takasaki, Katsuyoshi Chiba, Kazuhiko Mori
INTRODUCTION: Load-independent cardiac parameters obtained from the ventricular pressure-volume relationship are recognized as gold standard indexes for evaluating cardiac inotropy.In this study, for better analyses of cardiac risks, load-independent pressure-volume loop parameters were assessed in addition to load-dependent inotropic, hemodynamic and electrocardiographic changes in isoflurane-anesthetized monkeys. METHODS: The animals were given milrinone (a PDE 3 inhibitor), metoprolol (a β-blocker), or dl-sotalol (a β+IKr blocker) intravenously over 10min at two dose levels including clinically relevant doses (n=5/drug)...
October 15, 2016: Journal of Pharmacological and Toxicological Methods
Nicola Maurea, Paolo Spallarossa, Christian Cadeddu, Rosalinda Madonna, Donato Mele, Ines Monte, Giuseppina Novo, Pasquale Pagliaro, Alessia Pepe, Carlo G Tocchetti, Concetta Zito, Giuseppe Mercuro
The US National Cancer Institute estimates that cardiotoxicity (CTX) from target therapy refers mostly to four groups of drugs: epidermal growth factor receptor 2 inhibitors, angiogenic inhibitors, directed Abelson murine leukemia viral oncogene homolog inhibitors, and proteasome inhibitors. The main cardiotoxic side-effects related to antiepidermal growth factor receptor 2 therapy are left ventricular systolic dysfunction and heart failure. Angiogenesis inhibitors are associated with hypertension, left ventricular dysfunction/heart failure, myocardial ischemia, QT prolongation, and thrombosis...
May 2016: Journal of Cardiovascular Medicine
Ning Ma, Xiao-Yan Wu, Chang-Sheng Ma, Nian Liu, Rong Bai, Xin Du, Yan-Fei Ruan, Jian-Zeng Dong
Catheter ablation has been recommended as a treatment option for paroxysmal atrial fibrillation (PAF) patients complicated with type 2 diabetes mellitus (T2DM). PAF patients with T2DM have a higher recurrence rate after catheter ablation. Prolongation of corrected QT (QTc) interval has been linked to poor outcomes in T2DM patients. Whether the abnormal QTc interval is associated with the ablation outcome in the PAF patients with T2DM remains unknown. In this study, 134 PAF patients with T2DM undergoing primary catheter ablation were retrospectively enrolled...
October 2016: Journal of Huazhong University of Science and Technology. Medical Sciences
Glenwood Goss, Chun-Ming Tsai, Frances A Shepherd, Lyudmila Bazhenova, Jong Seok Lee, Gee-Chen Chang, Lucio Crino, Miyako Satouchi, Quincy Chu, Toyoaki Hida, Ji-Youn Han, Oscar Juan, Frank Dunphy, Makoto Nishio, Jin-Hyoung Kang, Margarita Majem, Helen Mann, Mireille Cantarini, Serban Ghiorghiu, Tetsuya Mitsudomi
BACKGROUND: Osimertinib (AZD9291) is an oral, potent, irreversible EGFR tyrosine-kinase inhibitor selective for EGFR tyrosine-kinase inhibitor sensitising mutations, and the EGFR Thr790Met resistance mutation. We assessed the efficacy and safety of osimertinib in patients with EGFR Thr790Met-positive non-small-cell lung cancer (NSCLC), who had progressed after previous therapy with an approved EGFR tyrosine-kinase inhibitor. METHODS: In this phase 2, open-label, single-arm study (AURA2), patients aged at least 18 years with centrally confirmed EGFR Thr790Met-positive mutations, locally advanced or metastatic (stage IIIB/IV) NSCLC who progressed on previous EGFR tyrosine-kinase inhibitor therapy received osimertinib 80 mg orally once daily; treatment could continue beyond progression if the investigator observed a clinical benefit...
October 14, 2016: Lancet Oncology
Shegu Gilbert, Devender Singh, M Lawrance Jesuraj
Severe QT interval prolongation >500ms occurs in one quarter of cardiac surgical patients in the perioperative period while moderate prolongation occurs in most of them. Prolonged QT interval may be associated with torsades de pointes and lead to sudden cardiac death. Because of the high incidence of prolonged QT in cardiac surgery patients and its perioperative adverse outcomes, it is vital to identify it early and take necessary precautions. We report and discuss the catastrophic events and management of two patients with long QT syndrome complicating mitral valve replacement...
September 2016: Indian Heart Journal
Steven P Sears, Trevor W Getz, Christopher O Austin, William C Palmer, Evelyn A Boyd, Fernando F Stancampiano
BACKGROUND: Azithromycin has been associated with abnormalities of cardiac repolarization and development of torsades de pointes. Observational data suggest that the risk of death from cardiovascular causes is increased in patients taking azithromycin. Little is known regarding the risk of ventricular arrhythmia in patients with prolongation of the corrected QT interval who receive azithromycin. OBJECTIVE: The purpose of this study was to determine the incidence of sustained ventricular tachycardia in patients with prolonged corrected QT (QTc) who subsequently received azithromycin...
March 2016: Drugs—Real World Outcomes
Frank F Vincenzi, Philippe Lunetta
While SCUBA diving, a 44-year-old Caucasian patient had an abnormal cardiac rhythm, presumably Torsade de Pointes (TdP), during the initial descent to depth. Upon surfacing, she developed ventricular fibrillation and died. The patient had been treated for mild depression for nearly a year with citalopram 60 mg per day, a drug known to cause prolonged QT interval. She had also been treated with two potentially hepatotoxic drugs. Liver impairment causes selective loss of cytochrome P450 (CYP) 2C19 activity, the major pathway for metabolism of citalopram...
December 2015: Drug Saf Case Rep
S Gibiino, A Trappoli, B Balzarro, A R Atti, D De Ronchi
A 71-year-old man developed coma with severe respiratory failure, hypotension, and tachycardia induced by the intentional ingestion of quetiapine fumarate extended release (XR) 20 g. At the time, he had been treated for bipolar depression with venlafaxine 75 mg/day, lamotrigine 100 mg/day, pregabalin 75 mg/day, and quetiapine XR 400 mg/day for approximately 1 year. Comorbidities were hypertension treated with metoprolol, diabetes mellitus type 2 treated with metformin, and benign prostatic hyperplasia treated with silodosin...
December 2015: Drug Saf Case Rep
Hyewon Chung, Anhye Kim, Kyoung Soo Lim, Sang-In Park, Kyung-Sang Yu, Seo Hyun Yoon, Joo-Youn Cho, Jae-Yong Chung
Escitalopram is the (S)-enantiomer of citalopram that has a potential QT prolonging effect. In this study, 12 healthy elderly individuals received a single oral dose of escitalopram (20 mg), and their pharmacokinetics and QT effect data were compared with data from 33 younger adults obtained in a previous study. Serial blood samples for pharmacokinetic analysis were collected and ECG was performed up to 48 h postdose. The elderly and younger adults showed similar pharmacokinetic profiles. The geometric mean ratios (90% confidence interval) of the elderly compared with the younger adults were 1...
October 12, 2016: International Clinical Psychopharmacology
Hiroko Izumi-Nakaseko, Yuji Nakamura, Xin Cao, Takeshi Wada, Kentaro Ando, Atsushi Sugiyama
Since an antipsychotic drug haloperidol has been clinically reported to induce QT interval prolongation and torsade de pointes, in this study its risk stratification for the onset of torsade de pointes was performed by using the chronic atrioventricular block canine model with a Holter electrocardiogram. Haloperidol in a dose of 3 mg kg(-1) p.o. prolonged the QT interval, but it did not induce torsade de pointes during the observation period of 21 h (n = 4), indicating that the dose would be safe. Meanwhile, haloperidol in a dose of 30 mg kg(-1) p...
October 13, 2016: Cardiovascular Toxicology
Robert M Nevels, Samuel T Gontkovsky, Bryman E Williams
Paroxetine, also known by the trade names Aropax, Paxil, Pexeva, Seroxat, Sereupin and Brisdelle, was first marketed in the U.S. in 1992. Effective for major depression and various anxiety disorders, it quickly gained a sizable share of the antidepressant prescription market. By the late 1990s, paroxetine frequently was being associated with serious drug interactions and medication side effects. Most significantly, in a major Canadian epidemiological study examining the relationship between antidepressants and diseases, paroxetine was associated with a 620 percent increase in the rate of breast cancer in women who had taken it over a four-year period...
March 1, 2016: Psychopharmacology Bulletin
Tal Lorberbaum, Kevin J Sampson, Jeremy B Chang, Vivek Iyer, Raymond L Woosley, Robert S Kass, Nicholas P Tatonetti
BACKGROUND: QT interval-prolonging drug-drug interactions (QT-DDIs) may increase the risk of life-threatening arrhythmia. Despite guidelines for testing from regulatory agencies, these interactions are usually discovered after drugs are marketed and may go undiscovered for years. OBJECTIVES: Using a combination of adverse event reports, electronic health records (EHR), and laboratory experiments, the goal of this study was to develop a data-driven pipeline for discovering QT-DDIs...
October 18, 2016: Journal of the American College of Cardiology
Wayne A Ray, Cecilia P Chung, Katherine T Murray, Kathi Hall, C Michael Stein
OBJECTIVE: Studies demonstrating that higher doses of citalopram (> 40 mg) and escitalopram (> 20 mg) prolong the corrected QT interval prompted regulatory agency warnings, which are controversial, given the absence of confirmatory clinical outcome studies. We compared the risk of potential arrhythmia-related deaths for high doses of these selective serotonin reuptake inhibitors (SSRIs) to that for equivalent doses of fluoxetine, paroxetine, and sertraline. METHODS: The Tennessee Medicaid retrospective cohort study included 54,220 persons 30-74 years of age without cancer or other life-threatening illness who were prescribed high-dose SSRIs from 1998 through 2011...
October 11, 2016: Journal of Clinical Psychiatry
Hiroshi Oiwa, Sho Mokuda
No abstract text is available yet for this article.
September 2016: Eur J Rheumatol
P Priyadarshini, Kbr Sastry, Suneel Kumar, Anuradha, Manjula
No abstract text is available yet for this article.
January 2016: Journal of the Association of Physicians of India
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