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Exercise electrocardiography

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https://www.readbyqxmd.com/read/29600967/ventricular-fibrillation-induced-by-radiofrequency-energy-delivery-for-premature-ventricular-contractions-arising-from-the-right-ventricular-outflow-tract-is-implantablecardioverterdefibrillator-indicated
#1
Michał Orczykowski, Paweł Derejko, Piotr Urbanek, Robert Bodalski, Radosław Lenarczyk, Dariusz Kozłowski, Edward Koźluk, Damian Łasocha, Maciej Sterliński, Zbigniew Kalarus, Maria Bilińska, Łukasz Szumowski
INTRODUCTION    Inadvertently induced ventricular fibrillation (VF) by radiofrequency (RF) energy delivery for premature ventricular complexes (PVCs) is a rare phenomenon; nevertheless, it is crucial to assess long‑term risk of sudden cardiac death in these patients. OBJECTIVES    The aim of our study was to define the long‑term prognosis in patients with normal ejection fraction (EF), in whom VF was inadvertently induced by RF energy application during ablation of symptomatic idiopathic PVCs originating from the right ventricular outflow tract (RVOT)...
March 29, 2018: Polish Archives of Internal Medicine
https://www.readbyqxmd.com/read/29590732/genetic-aspects-of-hereditary-arrhythmogenic-syndromes-in-children-and-adults
#2
REVIEW
Vesna Miranović, Snežana Crnogorac
Recent research has revealed the genetic etiology of a number of heart diseases that cause sudden cardiac death. Lethal channelopathies are of great importance among the genetically determined heart diseases. Their basic characteristics are unpredictable and deadly nature, autosomal dominant inheritance with variable expressivity and incomplete penetrance in structurally normal heart, and absence of morphological and histological clues that a standard autopsy can identify. Minimum screening of the relatives of sudden cardiac death victims involves taking medical history, physical examination, electrocardiography, echocardiography, and exercise testing...
December 2017: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29579580/cost-effectiveness-of-a-management-strategy-based-on-exercise-echocardiography-versus-exercise-electrocardiography-in-patients-presenting-with-suspected-angina-during-long-term-follow-up-a-randomized-study
#3
Sothinathan Gurunathan, Kostas Zacharias, Mohammed Akhtar, Asrar Ahmed, Vishal Mehta, Nikos Karogiannis, Anastasia Vamvakidou, Raj Khattar, Roxy Senior
INTRODUCTION: Exercise ECG (Ex-ECG) is advocated by guidelines for patients with low - intermediate probability of coronary artery disease (CAD). However, there are no randomized studies comparing Ex-ECG with exercise stress echocardiography (ESE) evaluating long term cost-effectiveness of each management strategy. METHODS: Accordingly, 385 patients with no prior CAD and low-intermediate probability of CAD (mean pre-test probability 34%), were randomized to undergo either Ex-ECG (194 patients) or ESE (191 patients)...
May 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29575607/the-maximum-qtc-of-holter-electrocardiography-in-a-pediatric-population
#4
Yoshiharu Ogawa, Toshikatsu Tanaka, Sachiko Kido
BACKGROUND: The corrected QT interval (QTc) of electrocardiograms (ECGs) at rest and after exercise in a short daytime recording period may be insufficient for the diagnosis and management of long QT syndrome (LQTS) patients, especially for those with LQTS type 2 and 3. Therefore, examining QTc using Holter ECG is important. We designed a method of analyzing QTc in Holter ECG that can be performed in daily clinical practice by combining automatic and manual measurements. METHODS: We reviewed the charts of healthy children (n=210) and LQTS patients (n=35) aged <16 years and analyzed QTc at rest, after exercise, and the maximum QTc of Holter ECG...
March 25, 2018: Pediatrics International: Official Journal of the Japan Pediatric Society
https://www.readbyqxmd.com/read/29522557/cardiac-electrophysiological-adaptations-in-the-equine-athlete-restitution-analysis-of-electrocardiographic-features
#5
Mengye Li, Karan R Chadda, Gareth D K Matthews, Celia M Marr, Christopher L-H Huang, Kamalan Jeevaratnam
Exercising horses uniquely accommodate 7-8-fold increases in heart rate (HR). The present experiments for the first time analysed the related adaptations in action potential (AP) restitution properties recorded by in vivo telemetric electrocardiography from Thoroughbred horses. The horses were subjected to a period of acceleration from walk to canter. The QRS durations, and QT and TQ intervals yielded AP conduction velocities, AP durations (APDs) and diastolic intervals respectively. From these, indices of active, λ = QT/(QRS duration), and resting, λ0 = TQ/(QRS duration), AP wavelengths were calculated...
2018: PloS One
https://www.readbyqxmd.com/read/29522390/which-test-for-cad-should-be-used-in-patients-with-left-bundle-branch-block
#6
REVIEW
Bo Xu, Paul Cremer, Wael Jaber, Stuart Moir, Serge C Harb, L Leonardo Rodriguez
Exercise stress electrocardiography is unreliable as a test for obstructive coronary artery disease (CAD) if the patient has left bundle branch block. The authors provide an algorithm for using alternative tests: exercise stress echocardiography, dobutamine echocardiography, computed tomographic (CT) angiography, and nuclear myocardial perfusion imaging.
March 2018: Cleveland Clinic Journal of Medicine
https://www.readbyqxmd.com/read/29513620/validation-of-a-pulse-oximetry-system-for-high-altitude-waterfowl-by-examining-the-hypoxia-responses-of-the-andean-goose-chloephaga-melanoptera
#7
Catherine M Ivy, Julia M York, Sabine L Lague, Beverly A Chua, Luis Alza, Kevin G McCracken, William K Milsom, Graham R Scott
Hypoxia at high altitudes constrains O2 supply to support metabolism, thermoregulation in the cold, and exercise. High-altitude natives that somehow overcome this challenge-who live, reproduce, and sometimes perform impressive feats of exercise at high altitudes-are a powerful group in which to study the evolution of physiological systems underlying hypoxia resistance. Here, we sought to determine whether a common pulse oximetry system for rodents (MouseOx Plus) can be used reliably in studies of high-altitude birds by examining the hypoxia responses of the Andean goose...
May 2018: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/29468917/the-acute-effects-of-aerobic-exercise-on-cognitive-flexibility-and-task-related-heart-rate-variability-in-children-with-adhd-and-healthy-controls
#8
Sebastian Ludyga, Markus Gerber, Manuel Mücke, Serge Brand, Peter Weber, Mark Brotzmann, Uwe Pühse
OBJECTIVE: To investigate cognitive flexibility and task-related heart rate variability following moderately intense aerobic exercise and after watching a video in both children with ADHD and healthy controls. METHOD: Using a cross-over design, participants completed cognitive assessments following exercise and a physically inactive control condition. Behavioral performance was assessed using the Alternate Uses task. Heart rate variability was recorded via electrocardiography during the cognitive task...
February 1, 2018: Journal of Attention Disorders
https://www.readbyqxmd.com/read/29453408/biosignals-reflect-pair-dynamics-in-collaborative-work-eda-and-ecg-study-of-pair-programming-in-a-classroom-environment
#9
Lauri Ahonen, Benjamin Ultan Cowley, Arto Hellas, Kai Puolamäki
Collaboration is a complex phenomenon, where intersubjective dynamics can greatly affect the productive outcome. Evaluation of collaboration is thus of great interest, and can potentially help achieve better outcomes and performance. However, quantitative measurement of collaboration is difficult, because much of the interaction occurs in the intersubjective space between collaborators. Manual observation and/or self-reports are subjective, laborious, and have a poor temporal resolution. The problem is compounded in natural settings where task-activity and response-compliance cannot be controlled...
February 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29431371/palpitations-evaluation-in-the-primary-care-setting
#10
Randell K Wexler, Adam Pleister, Subha V Raman
Palpitations are a common problem in the ambulatory primary care setting, and cardiac causes are the most concerning etiology. Psychiatric illness, adverse effects of prescription and over-the-counter medications, and substance use should also be considered. Distinguishing cardiac from noncardiac causes is important because of the risk of sudden death in those with an underlying cardiac etiology. A thorough history and physical examination, followed by targeted diagnostic testing, can distinguish cardiac conditions from other causes of palpitations...
December 15, 2017: American Family Physician
https://www.readbyqxmd.com/read/29359025/cardiac-autonomic-neuropathy-risk-factors-diagnosis-and-treatment
#11
REVIEW
Victoria A Serhiyenko, Alexandr A Serhiyenko
Cardiac autonomic neuropathy (CAN) is a serious complication of diabetes mellitus (DM) that is strongly associated with approximately five-fold increased risk of cardiovascular mortality. CAN manifests in a spectrum of things, ranging from resting tachycardia and fixed heart rate (HR) to development of "silent" myocardial infarction. Clinical correlates or risk markers for CAN are age, DM duration, glycemic control, hypertension, and dyslipidemia (DLP), development of other microvascular complications...
January 15, 2018: World Journal of Diabetes
https://www.readbyqxmd.com/read/29351473/sympathetically-mediated-cardiac-responses-to-isolated-muscle-metaboreflex-activation-following-exercise-are-modulated-by-body-position-in-humans
#12
André L Teixeira, Mauricio Daher, Mayara C Souza, Plinio S Ramos, James P Fisher, Lauro C Vianna
Isolated muscle metaboreflex activation with posthandgrip exercise ischemia (PEI) increases sympathetic nerve activity and partially maintains the exercise-induced increase in blood pressure, but a smaller heart rate (HR) response occurs. The cardiopulmonary baroreceptors, mechanically sensitive receptors that respond to changes in central blood volume and pressure, are strongly associated with changes in body position and upon activation elicit reflex sympathoinhibition. Here, we tested the hypothesis that postural changes modulate the sympathetically mediated cardiac response to PEI in humans...
March 1, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351468/gabaergic-contribution-to-the-muscle-mechanoreflex-mediated-heart-rate-responses-at-the-onset-of-exercise-in-humans
#13
André L Teixeira, Plinio S Ramos, Milena Samora, Jeann L Sabino-Carvalho, Djalma R Ricardo, Eduardo Colombari, Lauro C Vianna
Previous studies have indicated that central GABAergic mechanisms are involved in the heart rate (HR) responses at the onset of exercise. On the basis of previous research that showed similar increases in HR during passive and active cycling, we reasoned that the GABAergic mechanisms involved in the HR responses at the exercise onset are primarily mediated by muscle mechanoreceptor afferents. Therefore, in this study, we sought to determine whether central GABA mechanisms are involved in the muscle mechanoreflex-mediated HR responses at the onset of exercise in humans...
April 1, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29248657/comprehensive-cardiac-ct-with-myocardial-perfusion-imaging-versus-functional-testing-in-suspected-coronary-artery-disease-the-multicenter-randomized-crescent-ii-trial
#14
Marisa Lubbers, Adriaan Coenen, Marcel Kofflard, Tobias Bruning, Bas Kietselaer, Tjebbe Galema, Marc Kock, Andre Niezen, Marco Das, Marco van Gent, Ewout-Jan van den Bos, Leon van Woerkens, Paul Musters, Suze Kooij, Fay Nous, Ricardo Budde, Miriam Hunink, Koen Nieman
OBJECTIVES: This study sought to assess the effectiveness, efficiency, and safety of a tiered, comprehensive cardiac computed tomography (CT) protocol in comparison with functional testing. BACKGROUND: Although CT angiography accurately rules out coronary artery disease (CAD), incorporation of CT myocardial perfusion imaging as part of a tiered diagnostic approach could improve the clinical value and efficiency of cardiac CT in the diagnostic work-up of patients with angina pectoris...
December 8, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29238122/right-ventricular-function-in-patients-with-heart-failure-in-a-cardiac-clinic-in-southwest-nigeria
#15
Adeseye A Akintunde
Background: Right ventricular (RV) function is an important entity in heart failure. Patients with RV dysfunction (RVD) have poorer prognosis and exercise tolerance than those with preserved RV systolic function. Tricuspid annular plane systolic excursion (TAPSE) has been proposed as a simple and reproducible parameter for the qualitative assessment of RV systolic function/ejection fraction (EF). This study aims at describing RV function/RVD among heart failure patients in a specialized cardiac facility in Southwestern Nigeria...
January 2017: Nigerian Medical Journal: Journal of the Nigeria Medical Association
https://www.readbyqxmd.com/read/29187205/combined-double-chambered-right-ventricle-tricuspid-valve-dysplasia-ventricular-septal-defect-and-subaortic-stenosis-in-a-dog
#16
Iuliu Scurtu, Flaviu Tabaran, Mircea Mircean, Gavril Giurgiu, Andras Nagy, Cornel Catoi, Dan G Ohad
BACKGROUND: Double chambered right ventricle (DCRV) is a congenital heart anomaly where the right ventricle is divided into two chambers. We describe, for the first time, an unusual combination of DCRV combined with some other congenital heart defects. CASE PRESENTATION: A 1.2-year-old Golden Retriever was presented with lethargy, exercise intolerance and ascites. Physical examination revealed an irregularly irregular pulse and a grade V/VI, systolic, right cranial murmur...
November 29, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29184167/effect-of-nebivolol-or-atenolol-vs-placebo-on-cardiovascular-health-in-subjects-with-borderline-blood-pressure-the-evidence-study
#17
Daniel A Duprez, Natalia Florea, Sue Duval, Catherine Koukol, Jay N Cohn
Pharmacotherapy to protect the arteries may be appropriate for individuals with high-normal blood pressure who are at risk for future cardiovascular disease (CVD). Nebivolol (NEB) in contrast to atenolol (ATE) may have a beneficial effect on endothelial function and may be more effective than ATE in preventing CVD. Sixty subjects with preHTN or borderline BP and abnormal small artery elasticity (SAE) underwent evaluation with 10 tests, including large and small artery elasticity, resting and treadmill exercise BP, carotid intimal-media thickness, retinal vascular photography, micro-albuminuria, electrocardiography, echocardiography, and plasma B-type natriuretic peptide level...
December 2017: Journal of Human Hypertension
https://www.readbyqxmd.com/read/29183415/the-pre-participation-screening-in-young-athletes-which-protocol-do-we-need-exactly
#18
İbrahim I Çetin, Filiz Ekici, Ayşe E Kibar, Murat Sürücü, Ali Orgun
The aim was to assess the utility and feasibility of a comprehensive cardiac screening protocol in young athletes before participation in sports. A total of 380 athletes referring before participation in sports, between April, 2014 and April, 2015, were included in this study. The mean age was 12.4 years. A screening protocol has been applied to all, including personal and family history, physical examination, 12-lead electrocardiography, transthoracic echocardiography, 24-hour rhythm Holter analysis, and treadmill exercise test...
November 29, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/29161419/incidence-of-postoperative-atrial-fibrillation-recurrence-in-patients-discharged-in-sinus-rhythm-after-cardiac-surgery-a-systematic-review-and-meta-analysis
#19
Nicole Lowres, Georgina Mulcahy, Kai Jin, Robyn Gallagher, Lis Neubeck, Ben Freedman
Postoperative atrial fibrillation (POAF) is associated with increased stroke risk and mortality post-discharge. POAF is often considered transient; however, recurrence is likely under-recognized as symptoms are an unreliable guide. Surveillance post-discharge may identify asymptomatic POAF recurrences in patients discharged in sinus rhythm. Therefore, we performed a systematic review and meta-analysis of studies investigating POAF recurrence post-discharge, in patients with new-onset POAF following cardiac surgery who reverted to sinus rhythm prior to discharge...
November 17, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29135658/muscle-strength-influences-pressor-responses-to-static-handgrip-in-men-and-women
#20
Karambir Notay, Jordan B Lee, Anthony V Incognito, Jeremy D Seed, Adam A Arthurs, Philip J Millar
PURPOSE: Whether differences in absolute muscle strength impact blood pressure (BP) responses to relative intensity static exercise remains controversial but could contribute to known sex-based differences and influence the interpretation of cross-sectional data. METHODS: One hundred thirty-two healthy participants (66 men and 66 women, age: 22±3yrs) underwent continuous seated measurements of BP (Finometer) and heart rate (electrocardiography) during baseline rest and two minutes of static handgrip (30% maximal voluntary contraction [MVC])...
November 10, 2017: Medicine and Science in Sports and Exercise
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