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https://www.readbyqxmd.com/read/28940924/main-artifacts-in-electrocardiography
#1
REVIEW
Andrés Ricardo Pérez-Riera, Raimundo Barbosa-Barros, Rodrigo Daminello-Raimundo, Luiz Carlos de Abreu
Electrocardiographic artifacts are defined as electrocardiographic alterations, not related to cardiac electrical activity. As a result of artifacts, the components of the electrocardiogram (ECG) such as the baseline and waves can be distorted. Motion artifacts are due to shaking with rhythmic movement. Examples of motion artifacts include tremors with no evident cause, Parkinson's disease, cerebellar or intention tremor, anxiety, hyperthyroidism, multiple sclerosis, and drugs such as amphetamines, xanthines, lithium, benzodiazepines, or shivering (due to hypothermia, fever (rigor due to shaking), cardiopulmonary resuscitation by chest compression (oscillations of great amplitude) and patients who move their limbs during the test, causing sudden irregularities in the ECG baseline that may resemble premature contractions or interfere with ECG wave shapes, or other supraventricular and ventricular arrhythmias...
September 20, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28940881/diagnostic-yield-of-asymptomatic-arrhythmias-detected-by-mobile-cardiac-outpatient-telemetry-and-autotrigger-looping-event-cardiac-monitors
#2
Wayne M Derkac, Jeffrey R Finkelmeier, Daniel J Horgan, Mathew D Hutchinson
INTRODUCTION: Asymptomatic arrhythmias can have important therapeutic implications in certain patient populations, for example, atrial fibrillation in patients with prior ischemic stroke. We sought to compare the diagnostic yield of two commercially available monitoring systems with automated arrhythmia detection algorithms. METHODS: We queried a large, proprietary database containing rhythm data for patients receiving ambulatory EKG monitoring (BioTelemetry, Malvern, PA)...
September 22, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28931340/lessons-learnt-from-early-failure-of-a-patient-trial-with-a-polymer-on-polymer-resurfacing-hip-arthroplasty
#3
Job L C Van Susante, Nico Verdonschot, L Paul A Bom, Pawel Tomaszewski, Pat Campbell, Edward Ebramzadeh, B Wim Schreurs
Background and purpose - Hip resurfacing (HR) is a treatment option promoted for hip arthritis in young and active patients. However, adverse reactions to metal are a concern and the search for non-metallic bearing options proceeds. We present the first clinical study performed in patients using a newly developed hydrophilic polymer-on-polymer hip resurfacing device. Patients and methods - After performing extensive hip simulator tests, biocompatibility testing and animal tests (ISO 14242-1,3; 10993-3,4,5,10,11), approval was obtained from the IRB committee to enroll 15 patients in the first clinical study in humans using this experimental polymer-on-polymer hip resurfacing device...
September 21, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28929660/-establishment-of-biological-assess-for-quality-control-of-fuzi-based-on-determination-of-premature-ventricular-contractions-in-rats
#4
Zhi-Hao Zhao, Ding-Kun Zhang, Ming-Quan Wu, Chun-Yu Li, Li-Juan Cao, Ping Zhang, Cui-Zhe Liu, Jia-Bo Wang, Xiao-He Xiao
Aconiti Lateralis Radix (Fuzi) is a toxic traditional Chinese medicine with definite efficacy. In order to improve the quality control of its different prepared products and ensure the security in clinic, it is significant to establish a method of quality evaluation related to clinic adverse effects. Aiming at the important biological marker of early cardiac toxicity reaction, there was no method to detect it. In this manuscript, a novel approach for measuring the minimal toxic dose (MTD) of premature ventricular contractions (PVC) poisoning of rats was established...
October 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28921787/myocardial-bridging-is-associated-with-exercise-induced-ventricular-arrhythmia-and-increases-in-qt-dispersion
#5
Makiko Nishikii-Tachibana, Vedant S Pargaonkar, Ingela Schnittger, Francois Haddad, Ian S Rogers, Jennifer A Tremmel, Paul J Wang
BACKGROUND: A myocardial bridge (MB) has been associated with ventricular arrhythmia and sudden death during exercise. QT dispersion (QTd) is a measure of abnormal repolarization and may predict ventricular arrhythmia. We investigated the frequency of ventricular arrhythmias during exercise and the QTd at rest and after exercise, in patients with an MB compared to a normal cohort. METHODS: We studied the rest and stress ECG tracings of patients with an MB suspected by focal septal buckling on exercise echocardiography (EE) (Echo-MB group, N = 510), those with an MB confirmed by another examination (MB group, N = 110), and healthy controls (Control group, N = 198)...
September 18, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28916173/a-new-anatomical-view-on-the-vector-cardiogram-the-mean-temporal-spatial-isochrones
#6
Peter M van Dam
AIM: This proof of principle study aims to show the direct relationship between cardiac anatomy and the mean cardiac activation path as captured by the 12 lead ECG derived mean temporal-spatial isochrones (mean TSI) path. METHODS: To obtain the mean TSI signal a vector cardiographic (VCG) signal is constructed from the 12 lead ECG. The construction of the VCG signal uses a model of the heart and torso with patient specific electrode extracted from a 3D photo. The propagation of the activation through the heart is captured by estimating the mean of a cardiac activation isochrone using this VCG signal...
August 12, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28898687/outcomes-of-mifepristone-usage-for-cervical-ripening-and-induction-of-labour-in-full-term-pregnancy-randomized-controlled-trial
#7
Oleg R Baev, Valentina P Rumyantseva, Oleg V Tysyachnyu, Olga A Kozlova, Gennady T Sukhikh
OBJECTIVE: The most commonly used approved indications for mifepristone in obstetrics include: termination of early pregnancy, cervical dilatation prior to abortion, labour induction in case of fetal death in utero. Fewer studies have been conducted on the effect of mifepristone on cervical ripening and induction of labour in term pregnancy with a live fetus. The aim of our study was to evaluate efficacy and safety of mifepristone use for cervical ripening and induction of labour versus expectant management in full-term pregnancy...
September 1, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28893430/excessive-atrial-ectopic-activity-as-an-independent-risk-factor-for-ischemic-stroke
#8
Rita Marinheiro, Leonor Parreira, Pedro Amador, Catarina Sá, Tatiana Duarte, Rui Caria
BACKGROUND: Excessive atrial ectopic activity (EAEA) has been related with an increased risk of atrial fibrillation (AF) and stroke but different cutoff values have been used. We aimed to determine the association between EAEA and stroke, AF and overall death. METHODS: Consecutive 24-hour Holter monitoring performed between 2005 and 2010 in a single center was evaluated. Patients with a previous diagnosis of stroke or AF were excluded. The number of premature atrial contractions (PACs) during 24h was analyzed in 2480 subjects and according to that 3 sub-groups were defined: >97PACs/h (above the top 5th percentile of the population) (EAEA+); intermediate value of PACs/h (below the top 5th percentile but above 30PACs/h) (EAEA+/-) and <30PACs/h (EAEA-)...
August 26, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28882284/harmony-feasibility-trial-acute-and-short-term-outcomes-with-a-self-expanding-transcatheter-pulmonary-valve
#9
Lisa Bergersen, Lee N Benson, Matthew J Gillespie, Sharon L Cheatham, Andrew M Crean, Kan N Hor, Eric M Horlick, Te-Hsin Lung, Brian T McHenry, Mark D Osten, Andrew J Powell, John P Cheatham
OBJECTIVES: This study sought to obtain in vivo data to confirm assumptions on device loading conditions and assess procedural feasibility, safety, and valve performance. BACKGROUND: The Harmony transcatheter pulmonary valve (Medtronic, Minneapolis, Minnesota) was designed for patients with severe pulmonary regurgitation who require pulmonary valve replacement. METHODS: Three sites participated in this first Food and Drug Administration-approved early feasibility study using an innovative device design to accommodate the complex anatomy of the right ventricular outflow tract...
September 11, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28872359/ambulatory-blood-pressure-results-and-heart-rate-variability-in-patients-with-premature-ventricular-contractions
#10
Lutfu Askin, Mustafa Cetin, Serdar Turkmen
BACKGROUND: The presence of premature ventricular contractions (PVCs) is a sign of arrhythmia and typically trigerred by over stimulation of the sympathetic nervous system. This study examined the relationships among PVCs, heart rate variability (HRV), and 24-hour ambulatory blood pressure (ABP) results. METHODS: This observational clinical study evaluated a cohort of 100 consecutive patients (58 women and 42 men) with PVCs. The individuals were split into occasional (n = 50) and frequent (n = 50) PVCs groups...
September 5, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28845401/the-role-of-nt-probnp-in-the-diagnosis-of-ventricular-arrhythmias-in-patients-with-systemic-sclerosis
#11
Lucian Muresan, Ana Petcu, Crina Muresan, Mirela Rinzis, Gabriel Gusetu, Dana Pop, Dumitru Zdrenghea, Simona Rednic
BACKGROUND: In patients with systemic sclerosis, NT-proBNP is a useful diagnostic marker for pulmonary hypertension and ventricular dysfunction, with important prognostic significance. The aim of this study was to assess the relationship between the NT-proBNP levels and the presence and severity of ventricular arrhythmias in patients with scleroderma. METHODS: Forty consecutive patients with a diagnostic of systemic sclerosis according to the EULAR criteria admitted at the Rheumatology Clinic of Cluj-Napoca, Romania, from Jan 2014 to Apr 2014 were enrolled...
July 2017: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/28836312/premature-ventricular-contraction-induced-concealed-retrograde-penetration-electrocardiographic-manifestations-on-anterograde-ventricular-preexcitation
#12
Damián Longo, Adrian Baranchuk
In patients with manifest anterograde ventricular preexcitation, the electrocardiographic manifestation of the anomalous conduction through the simultaneous conduction over the atrioventricular (AV) node and the accessory pathway ("delta wave"); depends on several factors, the most representative being the conduction velocity over one or another connection. Occasionally, ventricular ectopic beats may present with retrograde penetration over one or both conduction pathways (AV node and/or accessory pathway), impacting on the morphology of the next immediate anterogradely conducted QRS...
August 24, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28802656/rethinking-papillary-muscle-resection-for-refractory-ventricular-tachycardia-in-the-lvad-era-a-case-report
#13
Zachary J Il'Giovine, Adam D DeVore, Chetan B Patel, Jason Koontz, Jacob Schroder
We report the case of a 57-year-old man with a history of ischemic cardiomyopathy who presented to the hospital with recurrent episodes of ventricular tachycardia refractory to antiarrhythmic medications. Mapping identified a deep premature ventricular contraction focus in the anterolateral papillary muscle, an area that has been previously identified as difficult to treat with radiofrequency catheter ablation. The hospital course was complicated by cardiogenic shock and VT-storm, and the patient ultimately underwent surgical resection of the anterolateral papillary muscle with left ventricular assist device placement as a successful bridge to cardiac transplantation...
July 12, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28797679/multiform-premature-ventricular-contractions-a-reason-not-to-ablate
#14
EDITORIAL
Roderick Tung
No abstract text is available yet for this article.
August 7, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28794532/local-anaesthetic-systemic-toxicity-following-oral-ingestion-in-a-child-revisiting-dibucaine
#15
Raylene Dias, Nandini Dave, Milind S Tullu, Chandrahas T Deshmukh
Dibucaine, a potent and toxic local anaesthetic, although currently withdrawn by the United States Food and Drug Administration for use as a spinal anaesthetic, continues to remain available in many over-the-counter topical formulations. Systemic toxicity following oral ingestion of local anaesthetics is rare. We report a case of accidental ingestion of dibucaine (ear drops) in a 7-year-old child who developed diplopia, giddiness, ventricular premature contractions and a right bundle branch block. We also present a brief discussion on the pharmacologic and toxicity profile of dibucaine, the Naranjo algorithm for assessing causality in case of adverse drug reactions and a review of current guidelines on the management of local anaesthetic systemic toxicity...
July 2017: Indian Journal of Anaesthesia
https://www.readbyqxmd.com/read/28791857/antiarrhythmic-properties-of-atrial-pacing
#16
REVIEW
Magdalena Kliś, Agnieszka Sławuta, Jacek Gajek
Bradycardia, atrial stretch and dilatation, autonomic nervous system disorders, and the presence of triggers such as atrial premature contractions, are factors which predispose a person to paroxysmal AF. Atrial pacing not only eliminates bradycardia but also prevents atrial premature contractions and dispersion of refractoriness, which are a substrate for atrial fibrillation. As the prolonged duration of atrial activation during pacing, especially from locations changing the physiological pattern of this activation (right atrium lateral wall, right atrium appendage), negatively influences both a mechanical and an electrical function of the atria, the atrial pacing site affects an atrial arrhythmogenesis...
March 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28791747/ecg-morphology-of-premature-ventricular-contractions-predicts-presence-of-myocardial-fibrotic-substrate-on-cardiac-magnetic-resonance-imaging-in-patients-undergoing-ablation
#17
Sabrina Oebel, Borislav Dinov, Arash Arya, Sebastian Hilbert, Philipp Sommer, Andreas Bollmann, Gerhard Hindricks, Ingo Paetsch, Cosima Jahnke
BACKGROUND: The most likely origin of PVCs may be deduced from surface ECG analysis while planning an electrophysiological study (EPS). Apart from purely benign forms of increased ventricular ectopy, myocardial substrate (e.g., regional fibrosis) may be present in certain cases, which will significantly impact the ablation approach. CMR imaging can reliably identify fibrotic target lesions and, hence, may assist in adequate patient selection and procedural planning. METHODS AND RESULTS: We analyzed 101 patients (59% male, mean age 57...
August 9, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28775064/ectopy-on-a-single-12-lead-ecg-incident-cardiac-myopathy-and-death-in-the-community
#18
Kaylin T Nguyen, Eric Vittinghoff, Thomas A Dewland, Jonathan W Dukes, Elsayed Z Soliman, Phyllis K Stein, John S Gottdiener, Alvaro Alonso, Lin Y Chen, Bruce M Psaty, Susan R Heckbert, Gregory M Marcus
BACKGROUND: Atrial fibrillation and heart failure are 2 of the most common diseases, yet ready means to identify individuals at risk are lacking. The 12-lead ECG is one of the most accessible tests in medicine. Our objective was to determine whether a premature atrial contraction observed on a standard 12-lead ECG would predict atrial fibrillation and mortality and whether a premature ventricular contraction would predict heart failure and mortality. METHODS AND RESULTS: We utilized the CHS (Cardiovascular Health) Study, which followed 5577 participants for a median of 12 years, as the primary cohort...
August 3, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28770871/yield-of-48-hour-holter-monitoring-in-children-with-unexplained-palpitations-and-significance-of-associated-symptoms
#19
Rabbia Aman, Ahmad Usaid Qureshi, Masood Sadiq
OBJECTIVE: To determine the yield of 48-hour Holter monitoring in children with unexplained palpitations and the significance of associated symptoms. METHODS: This descriptive study was conducted at the Children's Hospital and Institute of Child Health, Lahore, Pakistan, from January 1 to December 31, 2015. All children above 5 years of age with history of intermittent palpitations and normal basic cardiovascular workup were enrolled. A 48-hour Holter study was performed using Motara Holter Monitoring System...
July 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28765087/circadian-variability-patterns-predict-and-guide-premature-ventricular-contraction-ablation-procedural-inducibility-and-outcomes
#20
David Hamon, Guillaume Abehsira, Kai Gu, Albert Liu, Marie Blaye-Felice Sadron, Sophie Billet, Thomas Kambur, Mohammed Amer Swid, Noel G Boyle, Gopi Dandamudi, Philippe Maury, Minglong Chen, John M Miller, Nicolas Lellouche, Kalyanam Shivkumar, Jason S Bradfield
BACKGROUND: Infrequent intraprocedural premature ventricular complexes (PVCs) may impede radiofrequency catheter ablation (RFA) outcome, and pharmacologic induction is unpredictable. OBJECTIVE: The purpose of this study was to determine whether PVC circadian variation could help predict drug response. METHODS: Consecutive patients referred for RFA with detailed Holter monitoring and frequent monomorphic PVCs were included. Patients were divided into 3 groups based on hourly PVC count relationship to corresponding mean heart rate (HR) during each of the 24 hours on Holter: fast-HR-dependent PVC (F-HR-PVC) type for a positive correlation (Pearson, P <...
July 29, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
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