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Sinus bradycardia

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https://www.readbyqxmd.com/read/28807352/unusual-digoxin-toxicity-with-myocardial-injury
#1
Mohamad Jihad Mansour, Maher Kalaoui, Elie Chammas, Omar Hamoui, Tarek Fawaz, Wael A AlJaroudi
A 38-year-old healthy male presented with vomiting and profuse diarrhea, associated with blurry and yellow coloration of the vision (xanthopsia). Laboratory workup was unremarkable, except for hyperkalemia (K 5.2 mEq/L) and mildly elevated troponin level 0.11 ng/mL (cut-off value 0.08). An electrocardiogram showed sinus bradycardia with deep scooping of the T waves. Although the patient denied intake of any drugs, herbs, consumption of plants, a digoxin level was drawn and was significantly elevated >5ng/mL (therapeutic range 0...
July 12, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28803741/the-cardiovascular-toxicity-of-triadimefon-in-early-life-stage-of-zebrafish-and-potential-implications-to-human-health
#2
Hong-Cui Liu, Tian-Yi Chu, Li-Li Chen, Wen-Jun Gui, Guo-Nian Zhu
The health risk of triadimefon (TF) to cardiovascular system of human is still unclear, especially to pesticide suicides population, occupational population (farmers, retailers and pharmaceutical workers), and special population (young children and infants, pregnant women, older people, and those with compromised immune systems) who are at a greater risk. Therefore, firstly we explored the toxic effects and possible mechanism of cardiovascular toxicity induced by TF using zebrafish model. Zebrafish at stage of 48 h post fertilization (hpf) exposed to TF for 24 h exhibited morphological malformations which were further confirmed by histopathologic examination, including pericardial edema, circulation abnormalities, serious venous thrombosis and increased distance between the sinus venosus (SV) and bulbus arteriosus (BA) regions of the heart...
August 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28803248/a-functional-assay-for-sick-sinus-syndrome-genetic-variants
#3
Chuanchau J Jou, Cammon B Arrington, Spencer Barnett, Jiaxiang Shen, Scott Cho, Xiaoming Sheng, Patrick C McCullagh, Neil E Bowles, Chase M Pribble, Elizabeth V Saarel, Thomas A Pilcher, Susan P Etheridge, Martin Tristani-Firouzi
BACKGROUND/AIMS: Congenital Sick Sinus Syndrome (SSS) is a disorder associated with sudden cardiac death due to severe bradycardia and prolonged pauses. Mutations in HCN4, the gene encoding inward Na+/K+ current (If), have been described as a cause of congenital SSS. The objective of this study is to develop an SSS model in embryonic zebrafish, and use zebrafish as a moderate-throughput assay to functionally characterize HCN4 variants. METHODS: To determine the function of hcn4 in zebrafish, embryos were either bathed in the If -specific blocker (ZD-7288), or endogenous hcn4 expression was knocked down using splice-blocking morpholinos...
August 11, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28802598/effect-of-parecoxib-sodium-pretreatment-combined-with-dexmedetomidine-on-early-postoperative-cognitive-dysfunction-in-elderly-patients-after-shoulder-arthroscopy-a-randomized-double-blinded-controlled-trial
#4
Jian Lu, Gang Chen, Hongmei Zhou, Qinghe Zhou, Zhipeng Zhu, Cheng Wu
STUDY OBJECTIVE: To evaluate effect of parecoxib sodium pretreatment combined with dexmedetomidine on early postoperative cognitive dysfunction in elderly patients after shoulder arthroscopy. DESIGN: Randomized, double-blind study. SETTING: University-affiliated teaching hospital. PATIENTS: One hundred and fifty-two elderly patients scheduled for shoulder arthroscopy. INTERVENTIONS: At 15min before the induction of anesthesia, 152 patients received intravenously parecoxib sodium 40mg and dexmedetomidine at a dose of 0...
September 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28748840/cardiovascular-involvement-in-severe-malaria-a-prospective-study-in-ranchi-jharkhand
#5
Hemant Narayan Ray, Darshit Doshi, Appu Rajan, Amit K Singh, S B Singh, M K Das
BACKGROUND & OBJECTIVES: Malaria is considered as the most important parasitic disease of humans, causing seri- ous illness that can be fatal, if not diagnosed and treated immediately. It is a multisystem disorder affecting nearly every system of the body. The aim of the present study was to evaluate the involvement of cardiovascular system in severe malaria using non-invasive methods. METHODS: This prospective study was conducted on patients of severe malaria who were admitted between June and November 2015 in the Department of Medicine, Rajendra Institute of Medical Sciences and Hospital, Ranchi, Jharkhand, India...
April 2017: Journal of Vector Borne Diseases
https://www.readbyqxmd.com/read/28713431/an-unexpected-cause-of-bradycardia-in-a-patient-with-bacterial-meningitis
#6
Petros Ioannou, Magdalini Velegraki, Stella Soundoulounaki, Achilleas Gikas, Diamantis P Kofteridis
Sinus bradycardia which is a sinus rhythm with a resting heart rate of less than 60 bpm is caused by intrinsic cardiac disorders like sick sinus syndrome or inferior myocardial infarction, metabolic and environmental causes (such as hypothyroidism and electrolyte disorders), medications (such as beta-blockers and amiodarone), infection (such as myocarditis), increased intracranial pressure, and toxic exposure, while it can sometimes be a normal phenomenon, especially during sleep, in athletes, and during pregnancy...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/28690945/pacemaker-placement-in-persistent-left-superior-vena-cava
#7
Murtaza Sundhu, Mubbasher Syed, Sajjad Gul, Bilal Saqi, Robert Mosteller
Persistent left superior vena cava (PLSVC) is a rare disorder which is asymptomatic and hence is usually discovered while performing interventions through the left subclavian vein. We present a case of a 78-year-old male who was undergoing elective placement of a permanent pacemaker for tachycardia - bradycardia syndrome with post-conversion pauses of up to nine seconds. After achieving access through the left subclavian vein the wire kept on going on the left side of the chest instead of crossing the midline to the right side...
June 5, 2017: Curēus
https://www.readbyqxmd.com/read/28684593/point-exercise-training-induced-bradycardia-is-caused-by-changes-in-intrinsic-sinus-node-function
#8
Mark R Boyett, Yanwen Wang, Shu Nakao, Jonathan Ariyaratnam, George Hart, Oliver Monfredi, Alicia D'Souza
N/A.
July 6, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28674041/transient-notch-activation-induces-long-term-gene-expression-changes-leading-to-sick-sinus-syndrome-in-mice
#9
Yun Qiao, Catherine Lipovsky, Stephanie Hicks, Somya Bhatnagar, Gang Li, Aditi Khandekar, Robert Guzy, Kel Vin Woo, Colin G Nichols, Igor R Efimov, Stacey Rentschler
Rationale: Notch signaling programs cardiac conduction during development, and in the adult ventricle, injury-induced Notch reactivation initiates global transcriptional and epigenetic changes. Objective: To determine whether Notch reactivation may stably alter atrial ion channel gene expression and arrhythmia inducibility. Methods and Results: To model an injury response and determine the effects of Notch signaling on atrial electrophysiology, we transiently activate Notch signaling within adult myocardium using a doxycycline-inducible genetic system (iNICD)...
July 3, 2017: Circulation Research
https://www.readbyqxmd.com/read/28668627/vigabatrin-lacks-proarrhythmic-potential-results-from-a-thorough-qt-qtc-study-in-healthy-volunteers
#10
Dwain Tolbert, Susan Reid, Stuart Harris, Ihor Bekersky
PURPOSE: A thorough QT study was performed to assess the proarrhythmic potential of vigabatrin, an antiepileptic drug approved in the United States for the treatment of infantile spasms and refractory complex partial seizures. METHODS: In this Phase I, randomized, double-blind, placebo- and active-controlled (moxifloxacin), 4-sequence, crossover study conducted at a single center, healthy participants received 1 of 4 randomly assigned treatments: 3.0g vigabatrin solution (therapeutic dose) and 1 moxifloxacin placebo tablet; 6...
June 28, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/28666317/right-ventricular-and-tricuspid-valve-function-in-patients-chronically-implanted-with-leadless-pacemakers
#11
Erwan Salaun, Lilith Tovmassian, Blandine Simonnet, Roch Giorgi, Frédéric Franceschi, Linda Koutbi-Franceschi, Jérôme Hourdain, Gilbert Habib, Jean-Claude Deharo
Aims: Leadless cardiac pacing has recently been proposed as alternative to conventional right ventricular (RV) pacing. With this approach, devices are directly screwed or fixed with tines in the RV wall, but the possible consequences on RV and tricuspid valve (TV) structure and function remain unknown. We thus conducted a study to evaluate this potential impact in chronically implanted patients. Methods and results: Repeated echocardiographic studies were performed prior to implantation, at discharge, and 2 months thereafter on all consecutive patients implanted with a leadless pacemaker at our centre between October 2014 and end-December 2015...
June 28, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28651660/sudden-improvement-in-ventricular-repolarization-abnormality-after-a-short-detraining-period-in-an-athlete
#12
Noriko Motoki, Yohei Akazawa, Akira Hachiya, Yuji Inaba
We describe the case of a 17-year-old male soccer player with T-wave inversion in precordial leads in resting electrocardiography, which also disclosed sinus bradycardia, early repolarization, and increased QRS voltage. These findings strongly suggested cardiomyopathy. The patient's T-wave inversion disappeared during only 2 weeks of detraining, and it re-appeared 2 weeks after resumption of intensive training. This sudden change in electrocardiographic parameters over a short period helped in identifying the adolescent as having athlete's heart...
June 27, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28645472/bradycardia-syncope-and-left-ventricular-noncompaction-cardiomyopathy
#13
D Luke Glancy, Frederick R Helmcke, Allen P Hoang
A 55-year-old man with syncopal episodes was found to have sinus bradycardia at a rate of 37 beats/min, an episode of nonsustained ventricular tachycardia, and left ventricular noncompaction cardiomyopathy. After placement of a dual-chamber cardioverter defibrillator 4 years ago, he has had no further syncopal episodes, and there have been no defibrillator shocks.
May 30, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28641799/the-continued-search-for-physiological%C3%A2-pacing-where-are-we-now
#14
REVIEW
Pugazhendhi Vijayaraman, Pierre Bordachar, Kenneth A Ellenbogen
Cardiac pacing is an effective treatment for patients with bradycardia due to sinus node dysfunction or atrioventricular block. Despite decades of technological advances, the optimal ventricular pacing site to mimic normal human ventricular physiology and best hemodynamic response remains elusive. Beginning with atrial synchronous right ventricular (RV) apical pacing, the search has continued through alternate RV pacing sites, minimizing RV pacing, biventricular pacing, left ventricular (LV) pacing, and His-bundle pacing...
June 27, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28638671/prenatal-diagnosis-of-atrioventricular-block-and-qt-interval-prolongation-by-fetal-magnetocardiography-in-a-fetus-with-trisomy-18-and-scn5a-r1193q-variant
#15
Lisheng Lin, Miho Takahashi-Igari, Yoshiaki Kato, Yoshihiro Nozaki, Mana Obata, Hiromi Hamada, Hitoshi Horigome
We report a case of fetal trisomy 18 with SCN5A R1193Q variant that presented with sinus bradycardia, 2 : 1 atrioventricular block (AVB), and QT interval prolongation. These complex arrhythmias were diagnosed by fetal magnetocardiography combined with ultrasound findings. Advanced AVB and ventricular arrhythmias were confirmed after birth. Genetic testing of the baby revealed a SCN5A R1193Q variant, which we considered could account for the various arrhythmias in this case.
2017: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/28624975/deleterious-acute-and-chronic-effects-of-bradycardic-right-ventricular-apex-pacing-consequences-for-arrhythmic-outcome
#16
T R G Stams, A Dunnink, W M van Everdingen, H D M Beekman, R van der Nagel, B Kok, M F A Bierhuizen, M J Cramer, M Meine, M A Vos
In the chronic complete atrioventricular (AV) block dog (CAVB) model, both bradycardia and altered ventricular activation due to the uncontrolled idioventricular rhythm contribute to ventricular remodeling and the enhanced susceptibility to Torsade de Pointes (TdP) arrhythmias. We investigated the effect of permanent bradycardic right ventricular apex (RVA) pacing on mechanical and electrical remodeling and TdP. In 23 anesthetized dogs, serial experiments were performed at sinus rhythm (SR), acutely after AV block (AAVB) and 3 weeks of remodeling CAVB at a fixed pacing rate of 60/min...
July 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28606607/state-of-the-art-review-atrial-fibrillation-in-athletes
#17
REVIEW
M Darragh Flannery, Jonathan M Kalman, Prashanthan Sanders, André La Gerche
Exercise has substantial health benefits with pleomorphic vascular, metabolic, psychological and anti-neoplastic actions resulting in improved quality of life and longevity. Despite these many benefits, numerous studies have shown that endurance athletes are more likely to develop atrial fibrillation (AF) than non-athletes. The type, intensity and amount of sport appears to influence the risk of developing AF. Several endurance sport activities have been shown to increase the risk of developing AF but an excess in AF has not been shown in non-endurance sports...
June 3, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28601537/trigeminocardiac-reflex-as-the-presentation-of-maxillary-sinus-adenocarcinoma
#18
Jason M Lunt, Ahmad Al-Taee, Rachna Rawal, Fred R Buckhold
The trigeminocardiac reflex is a brainstem reflex that manifests as sudden hemodynamic dysfunction including bradycardia, hypotension, hypopnea, and gastric hypermotility due to mechanical stimulation of the trigeminal nerve. Here, the trigeminocardiac reflex was part of the initial patient presentation that led to the diagnosis of maxillary adenocarcinoma. A 54-year-old male presented to the emergency department with a two-month history of right upper jaw pain. Vital signs included blood pressure of 68/48 mmHg, heart rate of 55, and oxygen saturation of 85%...
June 7, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28593151/the-absence-of-atrial-contraction-as-a-predictor-of-permanent-pacemaker-implantation-after-maze-procedure-with-cryoablation
#19
Chang-Seok Jeon, Man-Shik Shim, Seung-Jung Park, Dong Seop Jeong, Kyoung-Min Park, Young Keun On, June Soo Kim, Pyo Won Park
BACKGROUND: The absence of atrial contraction (AC) after the maze procedure has been reported to cause subsequent annular dilatation and to increase the risk of embolic stroke. We hypothesized that the lack of AC could increase the risk of permanent pacemaker (PPM) implantation in patients undergoing the maze procedure. METHODS: In 376 consecutive patients who had undergone a cryo-maze procedure and combined valve operation, recovery of AC was assessed at baseline and at immediate (≤2 weeks), early (≤1 year, 4...
June 2017: Korean Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28577544/deactivation-vs-asynchronous-pacing-prospective-evaluation-of-a-protocol-for-rhythm-management-in-patients-with-magnetic-resonance-conditional-pacemakers-undergoing-adenosine-stress-cardiovascular-magnetic-resonance-imaging
#20
Oliver Klein-Wiele, Marietta Garmer, Gianluca Barbone, Rhyan Urbien, Martin Busch, Kaffer Kara, Harald Schäfer, Michael Schulte-Hermes, Birgit Hailer, Dietrich Grönemeyer
BACKGROUND: Cardiovascular Magnetic Resonance (CMR) imaging with adenosine stress is an important diagnostic tool in patients with known or suspected coronary artery disease (CAD). However, the method is not yet established for CAD patients with pacemakers (PM) in clinical practice. A possible reason is that no recommendations exist for PM setting (paused pacing or asynchronous mode) during adenosine stress. We elaborated a protocol for rhythm management in clinical routine for PM patients that considers heart rate changes under adenosine using a test infusion of adenosine in selected patients...
June 2, 2017: BMC Cardiovascular Disorders
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