keyword
MENU ▼
Read by QxMD icon Read
search

QT

keyword
https://www.readbyqxmd.com/read/28110482/the-evaluation-of-a-new-marker-of-transmyocardial-repolarization-parameters-in-ischemic-stroke-patients-t-peak-t-end-t-p-e-t-p-e-qtc
#1
Emine Emektar, Şeref Kerem Çorbacıoğlu, Osman Korucu, Selma Ramadan, Hüseyin Uzunosmanoğlu, Eda Kan, Yunsur Çevik
The cardiovascular manifestations of acute ischemic stroke have been well known. Several electrocardiography (ECG) abnormalities have been reported in patients following acute stroke, including QT interval prolongation, ST segment deviation and T-wave changes. This study aimed to investigate the changes in transmyocardial repolarization parameters, in ischemic stroke patients. The study is a prospective, blind, and controlled clinical study. The patients without cardiac disease who received ischemic stroke diagnoses were included in the study...
January 21, 2017: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/28109825/trends-in-coronary-risk-factors-and-electrocardiogram-findings-from-1977-to-2009-with-10-year-mortality-in-japanese-elderly-males-the-tanushimaru-study
#2
Sachiko Nakamura, Hisashi Adachi, Mika Enomoto, Ako Fukami, Eita Kumagai, Yume Nohara, Shoko Kono, Erika Nakao, Akiko Sakaue, Tomoko Tsuru, Nagisa Morikawa, Yoshihiro Fukumoto
BACKGROUND: An understanding of the trends in regard to coronary risk factors and electrocardiogram (ECG) findings has an important role in public health. We investigated the trends in coronary risk factors and main ECG findings in 1977, 1989, 1999, and 2009 in the Japanese cohort of the Seven Countries Study, in Tanushimaru, a typical farming town on Kyushu Island. METHODS AND RESULTS: A total of 1397 subjects (231 in 1977, 332 in 1989, 389 in 1999, and 445 in 2009) were enrolled in this study, and all of them were males aged over 65 years...
January 18, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28107074/analysis-of-the-normal-electrocardiogram-in-wild-rooks-corvus-frugilegus
#3
Hossein Hassanpour, Hossein Abbasi Dehkordi, Mehdi Khosravi, Saeid Soltani, Leila Nasiri
To describe the normal electrocardiographic (ECG) patterns and values in unanesthetized rooks ( Corvus frugilegus ), standard bipolar (I, II, and III) and augmented unipolar limb (aVR, aVL, and aVF) lead ECGs were recorded from 10 clinically healthy wild rooks. Wave forms were analyzed in all leads at 50 mm/s and at 10 mm = 1 mV to determine PR, QRS, ST, and QT durations; the net QRS complex; and P and T amplitudes. The polarity of each waveform was tabulated in all leads. The mean electrical axis (MEA) for the frontal plane was counted by using leads II and III...
December 2016: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/28105256/drug-induced-liver-injury-towards-early-prediction-and-risk-stratification
#4
REVIEW
Emanuel Raschi, Fabrizio De Ponti
Drug-induced liver injury (DILI) is a hot topic for clinicians, academia, drug companies and regulators, as shown by the steadily increasing number of publications and agents listed as causing liver damage (http://livertox.nih.gov/). As it was the case in the past decade with drug-induced QT prolongation/arrhythmia, there is an urgent unmet clinical need to develop tools for risk assessment and stratification in clinical practice and, in parallel, to improve prediction of pre-clinical models to support regulatory steps and facilitate early detection of liver-specific adverse drug events...
January 8, 2017: World Journal of Hepatology
https://www.readbyqxmd.com/read/28104339/routine-corrected-qt-interval-monitoring-with-antipsychotic-use-in-consultation-liaison-setting-playing-the-devil-s-advocate
#5
EDITORIAL
Awais Aftab, Prakash Mishra, Jeanne Lackamp
No abstract text is available yet for this article.
November 11, 2016: Psychosomatics
https://www.readbyqxmd.com/read/28102360/modification-of-distinct-ion-channels-differentially-modulates-ca-2-dynamics-in-primary-cultured-rat-ventricular-cardiomyocytes
#6
Xichun Li, Liping Shen, Fang Zhao, Xiaohan Zou, Yuwei He, Fan Zhang, Chunlei Zhang, Boyang Yu, Zhengyu Cao
Primary cultured cardiomyocytes show spontaneous Ca(2+) oscillations (SCOs) which not only govern contractile events, but undergo derangements that promote arrhythmogenesis through Ca(2+) -dependent mechanism. We systematically examined influence on SCOs of an array of ion channel modifiers by recording intracellular Ca(2+) dynamics in rat ventricular cardiomyocytes using Ca(2+) specific fluorescence dye, Fluo-8/AM. Voltage-gated sodium channels (VGSCs) activation elongates SCO duration and reduces SCO frequency while inhibition of VGSCs decreases SCO frequency without affecting amplitude and duration...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28100427/the-possible-role-of-propofol-in-drug-induced-torsades-de-pointes-a-real-world-single-center-analysis
#7
Victor A Abrich, Harish Ramakrishna, Arjun Mehta, Farouk Mookadam, Komandoor Srivathsan
BACKGROUND: Torsades de pointes (TdP) is a polymorphic ventricular tachycardia associated with QT prolongation. Propofol is a sedative-anesthetic with proarrhythmic effects on cardiac myocytes. We performed a retrospective study to determine the incidence of TdP following propofol exposure at Mayo Clinic (Rochester, MN) from 08/11/1998-11/20/2015. METHODS: We queried our database using key search terms to identify patients exposed to propofol who developed TdP perioperatively or during non-surgical sedation...
January 4, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28096388/competition-of-calcified-calmodulin-n-lobe-and-pip2-to-an-lqt-mutation-site-in-kv7-1-channel
#8
William Sam Tobelaim, Meidan Dvir, Guy Lebel, Meng Cui, Tal Buki, Asher Peretz, Milit Marom, Yoni Haitin, Diomedes E Logothetis, Joel Alan Hirsch, Bernard Attali
Voltage-gated potassium 7.1 (Kv7.1) channel and KCNE1 protein coassembly forms the slow potassium current IKS that repolarizes the cardiac action potential. The physiological importance of the IKS channel is underscored by the existence of mutations in human Kv7.1 and KCNE1 genes, which cause cardiac arrhythmias, such as the long-QT syndrome (LQT) and atrial fibrillation. The proximal Kv7.1 C terminus (CT) binds calmodulin (CaM) and phosphatidylinositol-4,5-bisphosphate (PIP2), but the role of CaM in channel function is still unclear, and its possible interaction with PIP2 is unknown...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28089740/early-remodeling-of-repolarizing-k-currents-in-the-%C3%AE-mhc-403-mouse-model-of-familial-hypertrophic-cardiomyopathy
#9
Rocco Hueneke, Adam Adenwala, Rebecca L Mellor, Jonathan G Seidman, Christine E Seidman, Jeanne M Nerbonne
Familial hypertrophic cardiomyopathy (HCM), linked to mutations in myosin, myosin-binding proteins and other sarcolemmal proteins, is associated with increased risk of life threatening ventricular arrhythmias, and a number of animal models have been developed to facilitate analysis of disease progression and mechanisms. In the experiments here, we use the αMHC(403/+) mouse line in which one αMHC allele harbors a common HCM mutation (in βMHC, Arg403 Gln). Here, we demonstrate marked prolongation of QT intervals in young adult (10-12week) male αMHC(403/+) mice, well in advance of the onset of measurable left ventricular hypertrophy...
January 12, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28087566/application-of-whole-exome-sequencing-in-the-clinical-diagnosis-and-management-of-inherited-cardiovascular-diseases-in-adults
#10
Sara B Seidelmann, Emily Smith, Lakshman Subrahmanyan, Daniel Dykas, Maen D Abou Ziki, Bani Azari, Fady Hannah-Shmouni, Yuexin Jiang, Joseph G Akar, Mark Marieb, Daniel Jacoby, Allen E Bale, Richard P Lifton, Arya Mani
BACKGROUND: With the advent of high throughput sequencing, the identification of genetic causes of cardiovascular disease (CVD) has become an integral part of medical diagnosis and management and at the forefront of personalized medicine in this field. The use of whole exome sequencing for clinical diagnosis, risk stratification, and management of inherited CVD has not been previously evaluated. METHODS AND RESULTS: We analyzed the results of whole exome sequencing in first 200 adult patients with inherited CVD, who underwent genetic testing at the Yale Program for Cardiovascular Genetics...
February 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28078246/the-effects-of-crocin-insulin-and-their-co-administration-on-the-heart-function-and-pathology-in-streptozotocin-induced-diabetic-rats
#11
Amir Abbas Farshid, Esmaeal Tamaddonfard, Masoumeh Moradi-Arzeloo, Navideh Mirzakhani
OBJECTIVE: Crocin is a saffron constituent with a potent anti-oxidant activity. The present study investigated the effects of crocin and insulin treatments (alone or in combination) on cardiac function and pathology in diabetic rats. MATERIALS AND METHODS: Diabetes was induced by intraperitoneal (i.p.) injection of streptozotocin (STZ, 50 mg/kg). Thereafter, crocin (5, 10 and 20 mg/kg, i.p.), subcutaneous (s.c.) injection of insulin (4 IU/kg) and their combination were administered for eight weeks...
November 2016: Avicenna Journal of Phytomedicine
https://www.readbyqxmd.com/read/28074556/qt-interval-shortening-with-isavuconazole-in-vitro-and-in-vivo-effects-on-cardiac-repolarization
#12
J Keirns, A Desai, D Kowalski, C Lademacher, S Mujais, B Parker, M J Schneidkraut, R Townsend, T Wojtkowski, T Yamazaki, M Yen, P R Kowey
Effects of isavuconazole (active moiety of isavuconazonium sulfate) on cardiac ion channels in vitro and cardiac repolarization clinically were assessed in a Phase 1, randomized, double-blind study in healthy individuals who received isavuconazole (after 2-day loading dose), at therapeutic or supratherapeutic doses daily for 11 days, moxifloxacin (400 mg QD), or placebo. A post-hoc analysis of the Phase 3 SECURE trial assessed effects on cardiac safety. L-type Ca(2+) channels were most sensitive to inhibition by isavuconazole...
January 11, 2017: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28073690/citrate-pathophysiology-and-metabolism
#13
REVIEW
Mehran Monchi
By chelating ionized calcium, citrate allows extracorporeal circuit anticoagulation without a bleeding risk for the patient. Citrate anticoagulation is also associated with a reduced activation of leucocytes and platelets. Citrate clearance by citric acid cycle (Krebs cycle) is not modified by renal failure, but is reduced by about 50% in patients with cirrhosis. Toxic effects of citrate result from a decrease in plasma ionized calcium of the patient. The first side effect is a prolongation of the QT interval...
December 30, 2016: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28073687/adverse-event-detection-using-the-fda-post-marketing-drug-safety-surveillance-system-cardiotoxicity-associated-with-loperamide-abuse-and-misuse
#14
Kimberley A Swank, Eileen Wu, Cindy Kortepeter, Jana McAninch, Robert L Levin
OBJECTIVE: The purpose of this investigation was to identify and characterize post-marketing reports of cardiotoxicity, including torsades de pointes (TdP), associated with loperamide use. METHODS: We searched the U.S. Food and Drug Administration Adverse Event Reporting System (FAERS) database for post-marketing reports of serious cardiac adverse events associated with loperamide use from December 28, 1976 (U.S. drug approval date), through December 14, 2015. We also conducted a Pubmed and Google Scholar search to identify additional published reports of cardiotoxicity associated with loperamide in the medical literature through February 11, 2016...
January 7, 2017: Journal of the American Pharmacists Association: JAPhA
https://www.readbyqxmd.com/read/28073499/physiological-and-transcriptional-responses-to-inorganic-nutrition-in-a-tropical-pacific-strain-of-alexandrium-minutum-implications-for-the-saxitoxin-genes-and-toxin-production
#15
Kieng Soon Hii, Po Teen Lim, Nyuk Fong Kon, Yoshinobu Takata, Gires Usup, Chui Pin Leaw
Saxitoxins (STXs) constitute a family of potent sodium channel blocking toxins, causative agents of paralytic shellfish poisoning (PSP), and are produced by several species of marine dinoflagellates and cyanobacteria. Two STX-core genes, sxtA and sxtG, have been well elucidated in Alexandrium but the expression of these genes under various nutritional modes in tropical species remains unclear. This study investigates the physiological responses of a tropical Pacific strain of Alexandrium minutum growing with nitrate or ammonium, and with various nitrogen to phosphorus (N:P) supply ratios...
June 2016: Harmful Algae
https://www.readbyqxmd.com/read/28071178/psychotropic-drugs-and-ventricular-repolarisation-the-effects-on-qt-interval-t-peak-to-t-end-interval-and-qt-dispersion
#16
Tiziano Acciavatti, Giovanni Martinotti, Mariangela Corbo, Eduardo Cinosi, Matteo Lupi, Fabrizio Ricci, Rosa Di Scala, Emilia D'Ugo, Viola De Francesco, Raffaele De Caterina, Massimo di Giannantonio
OBJECTIVE: We aimed to investigate in a clinical setting, the effects of different classes of psychotropic drugs on cardiac electrophysiological measures linked with an increased risk of sudden cardiac death. METHODS: We conducted a cross-sectional study in a population of 1059 psychiatric inpatients studying the effects of various psychotropic drugs on the T-peak to T-end (TpTe) interval, QT dispersion and QT interval. RESULTS: Methadone use showed a strong association with TpTe prolongation (odds ratio (OR)=12...
January 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28070890/the-role-of-conventional-and-right-sided-ecg-screening-for-subcutaneous-icd-in-a-tetralogy-of-fallot-population
#17
Pau Alonso, Joaquín Osca, Oscar Cano, Pedro Pimenta, Ana Andrés, Jaime Yagüe, José Millet, Joaquín Rueda, María José Sancho-Tello
BACKGROUND: Information regarding suitability for S-ICD implant in Tetralogy of Fallot (ToF) population is scarce and needs to be further explored. THE AIMS OF OUR STUDY WERE: (i) to determine the proportion of patients with ToF eligible for S-ICD, (ii) to identify the optimal sensing vector in ToF patients, (iii) to test specifically the eligibility for sICD with right-sided screening, and (iv) to compare with the proportion of eligible patients in a non-selected ICD population...
January 10, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28070113/pharmacological-characterization-of-microminipig-as-a-model-to-assess-the-drug-induced-cardiovascular-responses-for-non-clinical-toxicity-and-or-safety-pharmacology-studies
#18
Hirofumi Yokoyama, Yuji Nakamura, Hiroyuki Saito, Yukitoshi Nagayama, Kiyotaka Hoshiai, Takeshi Wada, Hiroko Izumi-Nakaseko, Kentaro Ando, Yasuki Akie, Atsushi Sugiyama
We tried to establish the halothane-anesthetized microminipigs as an alternative animal model for non-clinical toxicity and/or safety pharmacology studies. In order to characterize the halothane-anesthetized microminipigs, we firstly clarified the effects of halothane anesthesia on their cardiovascular system (n = 5). Then, we examined the cardiovascular effects of dl-sotalol in doses of 0.1, 0.3 and 1 mg/kg, i.v. on the halothane-anesthetized microminipigs (n = 6). Induction of the halothane anesthesia by itself prolonged the QT interval as well as QTcF, suggesting that the halothane anesthesia can reduce the cardiac repolarization reserve in microminipigs like in dogs...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28069489/putting-a-finer-point-on-it-resolving-qt-loci-using-multi-ethnic-studies
#19
EDITORIAL
Patrick T Ellinor
No abstract text is available yet for this article.
January 6, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28067212/estimation-of-the-qt-rr-relation-trade-off-between-goodness-of-fit-and-extrapolation-accuracy
#20
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
keyword
keyword
4488
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"