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https://www.readbyqxmd.com/read/28550978/left-ventricular-longitudinal-strain-impairment-predicts-cardiovascular-events-in-asymptomatic-type-1-myotonic-dystrophy
#1
Rodrigue Garcia, Michaela Rehman, Cyril Goujeau, Bruno Degand, François Le Gal, Benjamin Stordeur, Quentin Labarre, Luc Christiaens, Claire Bouleti
BACKGROUND: Type 1 myotonic dystrophy (DM1) patients' prognosis is very poor. Up until now, only a few prognostic factors for cardiovascular events have been identified, and they are predictive of end-stage disease. The aim was to assess the prognostic value of global longitudinal strain (GLS) for cardiovascular events in asymptomatic DM1 patients. METHODS: DM1 patients were included between 2011 and 2015 and followed up until January 2016. Patients underwent a transthoracic echocardiography at inclusion...
May 19, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28545487/inhaled-ambient-level-traffic-derived-particulates-decrease-cardiac-vagal-influence-and-baroreflexes-and-increase-arrhythmia-in-a-rat-model-of-metabolic-syndrome
#2
Alex P Carll, Samir M Crespo, Mauricio S Filho, Douglas H Zati, Brent A Coull, Edgar A Diaz, Rodrigo D Raimundo, Thomas N G Jaeger, Ana Laura Ricci-Vitor, Vasileios Papapostolou, Joy E Lawrence, David M Garner, Brigham S Perry, Jack R Harkema, John J Godleski
BACKGROUND: Epidemiological studies have linked exposures to ambient fine particulate matter (PM2.5) and traffic with autonomic nervous system imbalance (ANS) and cardiac pathophysiology, especially in individuals with preexisting disease. It is unclear whether metabolic syndrome (MetS) increases susceptibility to the effects of PM2.5. We hypothesized that exposure to traffic-derived primary and secondary organic aerosols (P + SOA) at ambient levels would cause autonomic and cardiovascular dysfunction in rats exhibiting features of MetS...
May 25, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/28496932/mobitz-type-2-av-block-dissolved-with-contrast-injection
#3
Umit Yasar Sinan, Veysel Oktay, Mefat Selishta, Mustafa Yıldız
There are many cases in the literature concerning the occurence of atrioventricular block in acute myocardial infarction. The prevelance and management of AV block in the setting of chronic myocardial ischemia remains unclear. Our case presented with stable angina pectoris. Treadmill test revealed Mobitz Type 2 AV block which disappeared with contrast injection and re-occured after injection during PCI.
October 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/28455405/respiration-driven-excessive-sinus-tachycardia-treated-with-clonidine
#4
Matthew Emile Li Kam Wa, Patricia Taraborrelli, Sajad Hayat, Phang Boon Lim
A 26-year-old man presented to our syncope service with debilitating daily palpitations, shortness of breath, presyncope and syncope following a severe viral respiratory illness 4 years previously. Mobitz type II block had previously been identified, leading to a permanent pacemaker and no further episodes of frank syncope. Transthoracic echocardiography, electophysiological study and repeated urine metanepherines were normal. His palpitations and presyncope were reproducible on deep inspiration, coughing, isometric hand exercise and passive leg raises...
April 28, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28439482/association-of-non-alcoholic-fatty-liver-disease-with-conduction-defects-on-electrocardiogram
#5
Muhammad A Mangi, Abdul M Minhas, Hiba Rehman, Furquan Pathan, Hong Liang, Sary Beidas
BACKGROUND: Non-alcoholic fatty liver disease (NAFLD) is a leading cause of liver disease in developed countries. The association of NAFLD with conduction defects is unknown. The aim of our study was to find whether an association exists between conduction defects and NAFLD. METHODS: This is a case-control retrospective study of 700 patients admitted to Orange Park Medical Center, Orange Park, Florida from 2009 to 2015. Patients with a history of alcohol use, congenital heart disease, infiltrative malignancy, and myocarditis were excluded from the study...
March 21, 2017: Curēus
https://www.readbyqxmd.com/read/28379700/building-polyelectrolyte-multilayers-with-calmodulin-a-neutron-and-x-ray-reflectivity-study
#6
Süleyman Cinar, Simone Möbitz, Samy Al-Ayoubi, Beatrix-Kamelia Seidlhofer, Claus Czeslik
We have studied the formation and functional properties of polyelectrolyte multilayers where calmodulin (CaM) is used as a polyanion. CaM is known to populate distinct conformational states upon binding Ca(2+) and small ligand molecules. Therefore, we have also probed the effects of Ca(2+) ions and trifluoperazine (TFP) as ligand molecule on the interfacial structures. Multilayers with the maximum sequence PEI-(PSS-PAH)x-CaM-PAH-CaM-PAH have been deposited on silicon wafers and characterized by X-ray and neutron reflectometry...
April 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28340894/wenckebach-pattern-in-right-bundle-branch-block-benign-or-not
#7
Weiting Huang, Paul Chun Yih Lim, Chi-Keong Ching
A Mobitz type I block (Wenckebach phenomenon) with narrow QRS complex is almost always due to a lesion in the AV node. In a type I block with wide QRS complex (>0.12sec), the block can be in the His-Purkinje system in 60-70% of the cases. Even though the progressive PR prolongation with every conducted beat suggests Wenckebach phenomenon, one needs to pay attention to the accompanying QRS complex. In the setting of persistent right bundle branch block, axis change of subsequent conducted beat before an unconducted p suggests alternating fascicular block, giving clue to unreliable infra-Hisian conduction; and in the setting of symptoms, a pacemaker should be implanted...
March 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28337327/discovery-of-potent-selective-and-structurally-novel-dot1l-inhibitors-by-a-fragment-linking-approach
#8
Henrik Möbitz, Rainer Machauer, Philipp Holzer, Andrea Vaupel, Frédéric Stauffer, Christian Ragot, Giorgio Caravatti, Clemens Scheufler, Cesar Fernandez, Ulrich Hommel, Ralph Tiedt, Kim S Beyer, Chao Chen, Hugh Zhu, Christoph Gaul
Misdirected catalytic activity of histone methyltransferase Dot1L is believed to be causative for a subset of highly aggressive acute leukemias. Targeting the catalytic domain of Dot1L represents a potential therapeutic approach for these leukemias. In the context of a comprehensive Dot1L hit finding strategy, a knowledge-based virtual screen of the Dot1L SAM binding pocket led to the discovery of 2, a non-nucleoside fragment mimicking key interactions of SAM bound to Dot1L. Fragment linking of 2 and 3, an induced back pocket binder identified in earlier studies, followed by careful ligand optimization led to the identification of 7, a highly potent, selective and structurally novel Dot1L inhibitor...
March 9, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28267964/incidence-predictors-and-outcomes-of-high-grade-atrioventricular-block-in-patients-with-st-segment-elevation-myocardial-infarction-undergoing-primary-percutaneous-coronary-intervention-from-the-horizons-ami-trial
#9
Ioanna Kosmidou, Björn Redfors, Rushad Dordi, José M Dizon, Thomas McAndrew, Roxana Mehran, Ori Ben-Yehuda, Gary S Mintz, Gregg W Stone
High-grade atrioventricular block (HAVB) is historically considered a marker of worse outcomes in patients with ST-segment elevation myocardial infarction (STEMI). However, the predictors and prognostic impact of HAVB in the primary percutaneous coronary intervention (PCI) era remain poorly understood. We sought to describe the characteristics and predictors of HAVB in patients undergoing primary PCI in STEMI and to assess the prognostic significance of HAVB in the contemporary reperfusion era. The present analysis includes 3,115 patients presenting with STEMI from the Harmonizing Outcomes with Revascularization and Stents in Acute Myocardial Infarction trial who underwent primary PCI...
May 1, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28149035/chlorantraniliprole-an-unusual-insecticide-poisoning-in-humans
#10
Ajay Kumar Mishra, Vignesh Kumar Chandiraseharan, Nisha Jose, Thambu David Sudarsanam
A 26-year-old female presented with deliberate self-harm using chlorantraniliprole, an unknown substance in human toxicology. She developed symptomatic Mobitz Type I atrioventricular block during observation, for which a temporary pacemaker was inserted. She reverted to sinus rhythm after 48 h and was discharged. Although claimed to be nontoxic to humans, chlorantraniliprole, an insecticide, could cause conduction defects by activating ryanodine receptors. To the best of our knowledge, this is the first case of chlorantraniliprole poisoning reported in the medical literature...
December 2016: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28100182/electrocardiographic-assessments-and-cardiac-events-after-fingolimod-first-dose-a-comprehensive-monitoring-study
#11
MULTICENTER STUDY
Volker Limmroth, Tjalf Ziemssen, Michael Lang, Stephan Richter, Bert Wagner, Judith Haas, Stephan Schmidt, Kathrin Gerbershagen, Christoph Lassek, Luisa Klotz, Olaf Hoffmann, Christian Albert, Katrin Schuh, Monika Baier-Ebert, Guillaume Wendt, Heinke Schieb, Susanne Hoyer, Ralf Dechend, Wilhelm Haverkamp
BACKGROUND: First dose observation for cardiac effects is required for fingolimod, but recommendations on the extent vary. This study aims to assess cardiac safety of fingolimod first dose. Individual bradyarrhythmic episodes were evaluated to assess the relevance of continuous electrocardiogram (ECG) monitoring. METHODS: START is an ongoing open-label, multi-center study. At the time of analysis 3951 patients were enrolled. The primary endpoints are the incidence of bradycardia (heart rate < 45 bpm) and second-/third-degree AV blocks during treatment initiation...
January 18, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28000218/supra-hisian-conduction-block-as-an-unusual-presenting-feature-of-takotsubo-cardiomyopathy
#12
Mukund Aravind Prabhu, Praveen Gopalakrishna Pai, Anjith Vupputuri, Saritha Shekhar, Madhavankutty Santhakumari Harikrishnan, Natarajan Umayammal Kumaraswamy
BACKGROUND: Atrioventricular (AV) block is rare in Takotsubo cardiomyopathy (TC). CASE REPORT: A 66-year-old female presented with fatigue. Her electrocardiogram revealed 3:2 Mobitz Type II AV block, confirmed to be supra-Hisian by electrophysiological study. Echocardiogram and left ventricular angiogram showed moderate left ventricular dysfunction and apical ballooning, whereas coronary angiogram revealed mildly ectatic coronaries. At 2 weeks AV block persisted, needing permanent pacemaker implantation...
May 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/27908913/comfrey-herbal-remedy-causing-second-degree-heart-block-do-not-be-outfoxed-by-digitalis
#13
Mathew Kurian Vithayathil, Matthew Edwards
A previously well woman aged 63 years presents to the emergency department with vomiting, palpitations and 3 presyncopal episodes. She had no previous medical or cardiac history, with the patient stating that she tried a herbal remedy of boiled comfrey leaves for insomnia 18 hours before arrival to the department. Her ECG showed multiple abnormalities, including bradycardia, second-degree atrioventricular node block, Mobitz Type 2, a shortened QT interval, downsloping ST depression and presence of U waves...
December 1, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/27882249/surviving-all-odds-a-unique-case-of-multiple-congenital-unruptured-sinus-of-valsalva-aneurysms-involving-both-left-and-right-coronary-sinuses-with-biventricular-dysfunction-and-heart-block
#14
Aniketh Vijay B, Vikrant Vijan, Navin Mathew
Aneurysms of the sinus of Valsalva are very uncommon, with an incidence ranging from 0.1 to 3.5% of all congenital heart defects. Very few cases have been reported in the literature that presented with involvement of two or more sinuses. We report a case of 27-year-old male with a history of exertional breathlessness of one-month duration. After complete evaluation using transesophageal echocardiography (TEE) and multiple detector computed tomography (MDCT) scanning, the patient was diagnosed to have large congenital unruptured sinus of Valsalva aneurysms involving both left and right coronary sinuses with extension into the interventricular septum...
2016: Case Reports in Cardiology
https://www.readbyqxmd.com/read/27849189/sleep-related-bradyarrhythmic-events-and-heart-rate-variability-in-apparently-healthy-individuals
#15
Tolga Çimen, Hamza Sunman, Mehmet Erat, Tolga Han Efe, Ahmet Akyel, Murat Bilgin, Sadık Açıkel, Mehmet Doğan, Ekrem Yeter
OBJECTIVE: It is thought that abnormal cardiac impulses of the autonomic nervous system during sleep are responsible for sleep-related bradyarrhythmias. Despite a proposed common etiopathogenesis and having common name of "sleep-related bradyarrhythmias," precise importance of sinoatrial or atrioventricular (AV) node involvement remains elusive. This study aimed to determine whether there is a difference in sleeprelated bradyarrhythmias from the point of view of heart rate variability (HRV)...
November 10, 2016: Anatolian Journal of Cardiology
https://www.readbyqxmd.com/read/27717423/conduction-disorders-after-sutureless-aortic-valve-replacement
#16
Ismail Bouhout, Amine Mazine, Lena Rivard, Aly Ghoneim, Ismail El-Hamamsy, Yoan Lamarche, Michel Carrier, Philippe Demers, Denis Bouchard
BACKGROUND: Sutureless self-expandable aortic bioprostheses rely on radial forces for stabilization, raising concern that these devices may increase the risk of postoperative conduction disease. The purpose of this study was to determine the incidence of conduction disorders after sutureless aortic valve replacement (AVR) with the Perceval S (Sorin Group, Saluggia, Italy) bioprosthesis. METHODS: Between June 2011 and March 2013, 108 consecutive patients underwent sutureless AVR with the Perceval S prosthesis...
April 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/27695244/cardiac-arrhythmia-in-wilson-s-disease-an-oversighted-and-overlooked-entity
#17
Bhupender Kumar Bajaj, Ankur Wadhwa, Richa Singh, Saurabh Gupta
Wilson's disease is a multisystem disorder which manifests with hepatic, neurological, musculoskeletal, hematological, renal, and cardiac symptoms. The hepatic and neurological manifestations often overshadow the other system involvement including cardiac symptoms and signs, which may prove fatal. We report a case of a young female who presented with progressive parkinsonian features and dystonia for around 4 months followed 2 months later by the complaint of episodes of light-headedness. She was diagnosed to have Wilson's disease based on the presence of Kayser-Fleischer ring and laboratory parameters of copper metabolism...
October 2016: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/27624575/cardiac-safety-profile-of-first-dose-of-fingolimod-for-relapsing-remitting-multiple-sclerosis-in-real-world-settings-data-from-a-german-prospective-multi-center-observational-study
#18
Ralf A Linker, Guillaume Wendt
INTRODUCTION: Fingolimod was the first oral therapy approved for the treatment of relapsing-remitting multiple sclerosis (RRMS). Due to its action on cardiac sphingosine 1-phosphate receptors, fingolimod is leading to a transient decrease in heart rate (HR) and the occurrence of rare and asymptomatic self-limited atrioventricular (AV) blocks. This German non-interventional clinical study aimed to assess the cardiac safety profile in RRMS patients during at least 6 h after the initial treatment or restart after interruption of fingolimod in real-world settings...
December 2016: Neurology and Therapy
https://www.readbyqxmd.com/read/27563395/discovery-of-novel-dot1l-inhibitors-through-a-structure-based-fragmentation-approach
#19
Chao Chen, Hugh Zhu, Frédéric Stauffer, Giorgio Caravatti, Susanne Vollmer, Rainer Machauer, Philipp Holzer, Henrik Möbitz, Clemens Scheufler, Martin Klumpp, Ralph Tiedt, Kim S Beyer, Keith Calkins, Daniel Guthy, Michael Kiffe, Jeff Zhang, Christoph Gaul
Oncogenic MLL fusion proteins aberrantly recruit Dot1L, a histone methyltransferase, to ectopic loci, leading to local hypermethylation of H3K79 and misexpression of HoxA genes driving MLL-rearranged leukemias. Inhibition of the methyltransferase activity of Dot1L in this setting is predicted to reverse aberrant H3K79 methylation, leading to repression of leukemogenic genes and tumor growth inhibition. In the context of our Dot1L drug discovery program, high-throughput screening led to the identification of 2, a weak Dot1L inhibitor with an unprecedented, induced pocket binding mode...
August 11, 2016: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27563394/optimization-of-a-fragment-based-screening-hit-toward-potent-dot1l-inhibitors-interacting-in-an-induced-binding-pocket
#20
Clemens Scheufler, Henrik Möbitz, Christoph Gaul, Christian Ragot, Céline Be, César Fernández, Kim S Beyer, Ralph Tiedt, Frédéric Stauffer
Mixed lineage leukemia (MLL) gene rearrangement induces leukemic transformation by ectopic recruitment of disruptor of telomeric silencing 1-like protein (DOT1L), a lysine histone methyltransferase, leading to local hypermethylation of H3K79 and misexpression of genes (including HoxA), which drive the leukemic phenotype. A weak fragment-based screening hit identified by SPR was cocrystallized with DOT1L and optimized using structure-based ligand optimization to yield compound 8 (IC50 = 14 nM). This series of inhibitors is structurally not related to cofactor SAM and is not interacting within the SAM binding pocket but induces a pocket adjacent to the SAM binding site...
August 11, 2016: ACS Medicinal Chemistry Letters
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