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QTc interval

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https://www.readbyqxmd.com/read/29786964/a-thorough-qt-qtc-study-with-laquinimod-a-novel-immunomodulator-in-development-for-multiple-sclerosis-and-huntington-disease
#1
Ofer Spiegelstein, Dorit Mimrod, Laura Rabinovich, Eli Eyal, Craig Sprenger, Anna Elgart, Emil Samara, Joel Morganroth
In this randomized double-blind study, 4 groups of healthy subjects (50 per arm) participated to evaluate the effect of laquinimod, an oral treatment in development for multiple sclerosis and Huntington disease, on the QTc interval. Subjects received a dose of either 0.6 or 1.2 mg/day laquinimod for 14 days, placebo for 14 days, or 13 days of placebo followed by a dose of 400 mg moxifloxacin on day 14. Continuous 12-lead electrocardiograms were recorded on day -1 (baseline) and days 14 to 17,  and quadruplicate electrocardiograms were extracted at predefined time points...
May 22, 2018: Clinical Pharmacology in Drug Development
https://www.readbyqxmd.com/read/29779679/loperamide-abuse-cardiotoxicity-should-loperamide-still-be-an-over-the-counter-medication
#2
Amr Idris, Kenji Kaye
Loperamide is an over-the-counter anti-diarrheal medication that is inexpensive, easily accessible, and widely used. It is generally thought to be safe and effective without the potential for abuse. However, recent discovery of its ability to treat opioid withdrawal symptoms at high doses has led to not only its abuse, but also the need to recognize its cardiotoxicity due to the ability to prolong the QTc interval. We report a case of a 33 year old female with a history of opioid dependence who presented to the emergency department with acute onset shortness of breath and generalized weakness who was subsequently found to be in ventricular tachycardia...
May 18, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29777559/utility-of-heart-rate-turbulence-and-t-wave-alternans-to-assess-risk-for-re-admission-and-cardiac-death-in-hospitalized-heart-failure-patients
#3
Shinya Yamada, Akiomi Yoshihisa, Yu Sato, Takamasa Sato, Masashi Kamioka, Takashi Kaneshiro, Masayoshi Oikawa, Atsushi Kobayashi, Hitoshi Suzuki, Takafumi Ishida, Yasuchika Takeishi
BACKGROUND: Heart failure (HF) patients have a higher risk of recurrent HF and cardiac death, and electrical remodeling is considered to be an important factor for HF progression. The present study aimed to validate the utility of electrocardiogram and Holter monitoring for the risk stratification of HF patients. METHODS: Our study comprised 215 patients (144 males, mean age 62 years) who had been hospitalized due to acute decompensated HF. Electrocardiogram (QRS duration and QTc interval) and 24-hour Holter monitoring (heart rate variability, heart rate turbulence and T-wave alternans [TWA]) were performed in stable condition before discharge...
May 18, 2018: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29775246/tramadol-hydrochloride-at-steady-state-lacks-clinically-relevant-qtc-interval-increases-in-healthy-adults
#4
Joseph Massarella, Jay Ariyawansa, Jaya Natarajan, Stephan Francke, Thomas Murtaugh, Byron DeLemos, Subusola Vaughan, Sergio Fonseca
We evaluated the effects of therapeutic and supratherapeutic doses of tramadol hydrochloride on the corrected QT (QTc) interval in healthy adults (aged 18-55 years) in a randomized, phase I, double-blind, placebo- and positive-controlled, multiple-dose, 4-way crossover study. Participants were randomized to receive 1 of 4 treatments (A-D), 1 each in 4 treatment periods (1-4), separated by a washout period (7-15 days). Treatment A comprised tramadol 400 mg (therapeutic dose) on days 1 through 3, tramadol 100 mg and moxifloxacin-matched placebo on day 4, and placebo on all 4 days...
May 18, 2018: Clinical Pharmacology in Drug Development
https://www.readbyqxmd.com/read/29775213/individual-specific-qt-interval-correction-for-drugs-with-substantial-heart-rate-effect-using-holter-ecgs-extracted-over-a-wide-range-of-heart-rates
#5
Gopi Krishna Panicker, Pramod Kadam, Saikat Chakraborty, Snehal Kothari, J Rick Turner, Dilip R Karnad
Although fixed QT correction methods are typically used to adjust for the effect of heart rate on the QT interval in thorough QT/QTc studies, individual-specific QT correction (QTcI = QT/RRI ) is advisable for drugs that increase the heart rate by >5 to 10 beats/minute (bpm). QTcI is traditionally derived using resting drug-free electrocardiograms (ECGs) collected at prespecified times. However, the resting heart rate range in healthy individuals is narrow, and extrapolation of inferences from these data to higher heart rates could be inappropriate...
May 18, 2018: Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29774881/-effect-of-down-regulation-of-iks-repolarization-reserve-on-ventricular-arrhythmogenesis-in-a-guinea-pig-model-of-cardiac-hypertrophy
#6
Hegui Wang, Ting Huang, Zheng Wang, Nannan Ge, Yongsheng Ke
To observe the changes of rapidly activated delayed rectifier potassium channel (IKr) and slowly activated delayed rectifier potassium channel (IKs) in cardiac hypertrophy and to evaluate the effects of IKr and IKs blocker on the incidence of ventricular arrhythmias in guinea pigs with left ventricular hypertrophy (LVH).
 Methods: Guinea pigs were divided into a sham operation group and a left ventricular hypertrophy (LVH) group. LVH model was prepared. Whole cell patch-clamp technique was used to record IKr and IKs tail currents in a guinea pig model with LVH...
April 28, 2018: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/29774373/cardiovascular-system-changes-in-rheumatoid-arthritis-patients-with-continued-low-disease-activity
#7
Małgorzata Biskup, Wojciech Biskup, Maria Majdan, Bożena Targońska-Stępniak
Systemic inflammation and disease activity seem to contribute to excessive prevalence of cardiovascular (CV) diseases (CVDs) in patients with rheumatoid arthritis (RA). The objective of the study was to assess chosen CV parameters in RA patients who have continuous low disease activity. The study group consisted of 70 RA patients without known CVD and 33 healthy controls, of a comparable age. All RA patients had continued low disease activity (DAS28 ≤ 3.2) from 2 to 7 years. The groups were assessed for: blood pressure, serum amino-terminal pro-brain natriuretic peptide (NT-proBNP), carotid intima media thickness (cIMT), electrocardiography (ECG), ejection fraction (EJ) and diastolic dysfunction (E/A ratio) in echocardiography...
May 17, 2018: Rheumatology International
https://www.readbyqxmd.com/read/29766268/electrocardiographic-and-echocardiographic-findings-in-muscular-dystrophy-patients-with-heart-failure
#8
Masataka Ogiso, Toshiaki Isogai, Ken Kato, Hiroyuki Tanaka, Tamotsu Tejima, Eiji Isozaki
Cardiac involvement in muscular dystrophy (MD) is known to cause heart failure (HF). However, little is known about the differences in electrocardiographic and echocardiographic findings between MD patients with and without the experience of hospitalization for HF. We retrospectively identified 95 MD patients (mean age at diagnosis of MD 41.1 ± 18.7 years; males 64.2%), including nine (9.4%) patients who were hospitalized for HF (the HF group) and 86 (90.6%) patients who were not (the non-HF group) during the follow-up period (16...
May 15, 2018: Heart and Vessels
https://www.readbyqxmd.com/read/29761176/androgen-deprivation-therapy-is-associated-with-prolongation-of-qtc-interval-in-men-with-prostate-cancer
#9
Thiago Gagliano-Jucá, Thomas G Travison, Philip W Kantoff, Paul L Nguyen, Mary-Ellen Taplin, Adam S Kibel, Grace Huang, Richelle Bearup, Haley Schram, Robert Manley, Yusnie M Beleva, Robert R Edwards, Shehzad Basaria
Context: Androgen deprivation therapy (ADT) for prostate cancer (PCa) is associated with increased cardiovascular mortality and sudden cardiac death, with some events occurring early after initiation of ADT. Testosterone levels are inversely associated with corrected QT (QTc) interval duration; therefore, prolongation of QTc duration could be responsible for some of these events during ADT. Objective: To evaluate changes in QTc duration during ADT. Design and Interventions: A 6-month prospective cohort study that enrolled men with PCa about to undergo ADT (ADT group) and a control group of men who previously underwent prostatectomy for PCa and never received ADT (non-ADT group)...
May 1, 2018: Journal of the Endocrine Society
https://www.readbyqxmd.com/read/29759841/prolonged-ventricular-conduction-and-repolarization-during-right-ventricular-stimulation-predicts-ventricular-arrhythmias-and-death-in-patients-with-cardiomyopathy
#10
Freddy Del-Carpio Munoz, S Michael Gharacholou, Christopher G Scott, Vuyisile T Nkomo, Francisco Lopez-Jimenez, Yong-Mei Cha, Thomas M Munger, Paul A Friedman, Samuel J Asirvatham
OBJECTIVES: The goal of this study was to evaluate whether prolonged ventricular conduction (paced QRS) and repolarization (paced QTc) times observed during ventricular stimulation predict ventricular arrhythmic events and death. BACKGROUND: Abnormal ventricular conduction and repolarization can predispose patients to ventricular arrhythmias. METHODS: Consecutive patients with left ventricular dysfunction (ejection fraction <50%) undergoing electrophysiology studies from January 2002 until May 2014 were identified at Mayo Clinic (Rochester, Minnesota)...
December 26, 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29759542/a-new-qt-interval-correction-formulae-to-adjust-for-increases-in-heart-rate
#11
Simon W Rabkin, Elena Szefer, Darby J S Thompson
OBJECTIVES: This study sought to develop a formula from a large population-based study that best fit the QT-heart rate (HR) relationship independent of the standard mathematical relationships. BACKGROUND: Attempts to adjust or correct for the impact of HR on the QT interval (QTc) have applied various mathematical equations to electrocardiographic (ECG) data rather than allowing the data to determine the form of the relationship. METHODS: A spline correction function was developed using the ECG data from NHANES (National Health and Nutrition Examination Surveys) II and III...
July 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29759541/the-phenotypic-spectrum-of-a-mutation-hotspot-responsible-for-the-short-qt-syndrome
#12
Dan Hu, Yang Li, Jiancheng Zhang, Ryan Pfeiffer, Michael H Gollob, Jeff Healey, Daniel Toshio Harrell, Naomasa Makita, Haruhiko Abe, Yaxun Sun, Jihong Guo, Li Zhang, Ganxin Yan, Douglas Mah, Edward P Walsh, Harris B Leopold, Carla Giustetto, Fiorenzo Gaita, Agnieszka Zienciuk-Krajka, Andrea Mazzanti, Silvia G Priori, Charles Antzelevitch, Hector Barajas-Martinez
OBJECTIVES: This study sought to evaluate the phenotypic and functional expression of an apparent hotspot mutation associated with short QT syndrome (SQTS). BACKGROUND: SQTS is a rare channelopathy associated with a high risk of life-threatening arrhythmias and sudden cardiac death (SCD). METHODS: Probands diagnosed with SQTS and their family members were evaluated clinically and genetically. KCNH2 wild-type (WT) and mutant genes were transiently expressed in HEK293 cells, and currents were recorded using whole-cell patch clamp and action potential (AP) clamp techniques...
July 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29752526/application-of-the-bogossian-formula-for-evaluation-of-the-qt-interval-in-pacemaker-patients-with-stimulated-left-bundle-branch-block
#13
K F Weipert, H Bogossian, P Conzen, G Frommeyer, C Gemein, I Helmig, R Chasan, L Eckardt, M Seyfarth, B Lemke, M Zarse, C W Hamm, J Schmitt, D Erkapic
BACKGROUND: The presence of left bundle branch block (LBBB) represents a particular challenge in properly measuring the QT interval. Here we demonstrate the applicability of the "Bogossian formula" in pacemaker patients with LBBB due to apical or nonapical right ventricular (RV) pacing and preserved left ventricular function. METHODS: A total of 163 patients with a cardiac one- or two-chamber pacemaker were included in this prospective, multicentre observational study...
May 11, 2018: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/29746871/discrete-typing-units-of-trypanosoma-cruzi-detected-by-real-time-pcr-in-chilean-patients-with-chronic-chagas-cardiomyopathy
#14
Catalina Muñoz-San Martín, Inés Zulantay, Miguel Saavedra, Cristián Fuentealba, Gabriela Muñoz, Werner Apt
Chagas disease is a major public health problem in Latin America and has spread to other countries due to immigration of infected persons. 10-30% of patients with chronic Chagas disease will develop cardiomyopathy. Chagas cardiomyopathy is the worst form of the disease, due to its high morbidity and mortality. Because of its prognostic value and adequate medical monitoring, it is very important to identify infected people who could develop Chagas cardiomyopathy. The aim of this study was to determine if discrete typing units (DTUs) of Trypanosoma cruzi are related to the presence of heart disease in patients with chronic Chagas disease...
May 7, 2018: Acta Tropica
https://www.readbyqxmd.com/read/29740922/association-of-hypoglycaemia-and-cardiac-arrhythmia-risk-in-patients-with-diabetes-mellitus-a-systematic-review-and-meta-analysis
#15
Claire Fitzpatrick, Sudesna Chatterjee, Samuel Seidu, Danielle H Bodicoat, G Andre Ng, Melanie J Davies, Kamlesh Khunti
AIMS: Hypoglycaemia is associated with increased cardiovascular risk amongst individuals with diabetes mellitus. It has been hypothesised that hypoglycaemia may trigger autonomic changes leading to increased cardiac arrhythmia risk. We conducted a systematic review and meta-analysis to explore this association. MATERIALS AND METHODS: Ovid Medline, Embase, Scopus, Web of Science and Cochrane were searched from inception to October 10, 2017. We included studies of adults with diabetes (Type 1 or Type 2) which compared acute electrocardiogram (ECG) changes during episodes of hypoglycaemia and euglycaemia...
May 8, 2018: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/29738425/a-pilot-open-label-8-week-study-evaluating-desvenlafaxine-for-treatment-of-major-depression-in-methadone-maintained-individuals-with-opioid-use-disorder
#16
Cynthia El Hage, Maykel F Ghabrash, Simon Dubreucq, Suzanne Brissette, François Lespérance, Paul Lespérance, Clairélaine Ouellet-Plamondon, Julie Bruneau, Didier Jutras-Aswad
Depression is one of the most prevalent psychiatric disorders among opioid-dependent individuals. Clinical trials testing selective serotonin reuptake inhibitors among depressed patients on methadone maintenance therapy (MMT) failed to show efficacy, whereas those on tricyclic antidepressants produced mixed results with potential for cardiotoxicity. Desvenlafaxine (DESV) is a SNRI with minimal cardiotoxicity and drug interactions. This study sought to assess feasibility and tolerability of using DESV in depressed patients on MMT...
May 7, 2018: International Clinical Psychopharmacology
https://www.readbyqxmd.com/read/29738315/diagnosis-and-treatment-of-histoplasmosis-in-solid-organ-transplant-patients
#17
Kiran Gajurel, Reshika Dhakal, Stan Deresinski
PURPOSE OF REVIEW: Unlike immunocompetent hosts, solid organ transplant (SOT) recipients with posttransplant histoplasmosis (PTH) often present with disseminated disease and have an attributable mortality of approximately 10%. In this review, we discuss currently available diagnostic tests and treatment strategies in PTH. RECENT FINDINGS: None of the available tests have a 100% diagnostic accuracy. Histoplasma antigen assays are the most sensitive commercially available tests...
May 5, 2018: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/29731619/association-between-a-frailty-index-based-on-common-laboratory-tests-and-qtc-prolongation-in-older-adults-the-rugao-longevity-and-ageing-study
#18
Teng Ma, Jian Cai, Yin-Sheng Zhu, Xue-Feng Chu, Yong Wang, Guo-Ping Shi, Zheng-Dong Wang, Shun Yao, Xiao-Feng Wang, Xiao-Yan Jiang
Background: Risk factors for heart rate-corrected QT interval (QTc) proglongation should be explored to stratify high-risk individuals to aid the prevention of incident cardiovascular events and mortality. The diversity of risk factors for QTc prolongation suggests that use of the frailty index (FI), indicating general health deficits, may be an effective approach, especially in the elderly, to identify the risk of QTc prolongation. Methods: We used the data of 1,780 individuals aged 70-87 years from the Rugao Longevity and Ageing Study (RuLAS), a community-based longitudinal study...
2018: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/29730876/qtc-prolongation-and-ventricular-trigemini-with-asenapine-a-case-report
#19
Jesjeet Singh Gıll, Ahmad Hatim Sulaıman
Asenapine is one of the newer atypical antipsychotics on the market. It is a sublingually administered drug that is indicated for the treatment of both schizophrenia and bipolar disorder, and is considered to be safe and well tolerated. Herein, we report a 71-year-old female with a history of bipolar disorder who had ventricular trigemini and experienced a large increase in her QTc interval after starting treatment with asenapine. These changes ceased following withdrawal of asenapine. In this case report, we discuss the importance of cardiac monitoring when switching antipsychotics, even to those that are considered to have low cardiac risk...
2018: Türk Psikiyatri Dergisi, Turkish Journal of Psychiatry
https://www.readbyqxmd.com/read/29726590/changes-in-the-parameters-of-ventricular-repolarization-during-pre-apnea-apnea-and-post-apnea-periods-in-patients-with-obstructive-sleep-apnea
#20
Erdoğan Sökmen, Sinan Cemgil Özbek, Mustafa Çelik, Serkan Sivri, Mehmet Metin, Mustafa Avcu
BACKGROUND: Ventricular arrhythmias are reported to be more common in patients with obstructive sleep apnea (OSA). Preliminary evidence showed such parameters regarding ventricular repolarization as Tp-e, Tp-e/QT and Tp-e/QTc may be related with increased cardiac arrhythmias and even sudden cardiac death. The purpose of the present study was to evaluate ventricular repolarization during immediately pre-apnea period, apnea period and postapnea hyperventilation period in patients with OSA...
May 4, 2018: Pacing and Clinical Electrophysiology: PACE
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