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ECG interpretation

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https://www.readbyqxmd.com/read/28107074/analysis-of-the-normal-electrocardiogram-in-wild-rooks-corvus-frugilegus
#1
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/28065822/detecting-drug-induced-changes-in-ecg-parameters-using-jacketed-telemetry-effect-of-different-data-reduction-techniques
#2
Matthew Skinner, Guozhen Xing, Jing Lu, Jin Ren, Karen Oldman
INTRODUCTION: Continuous cardiovascular data is routinely collected during preclinical safety assessment of new medicines. This generates large datasets, which must be summarised to analyse and interpret drug effects. We assessed four methods of data reduction of continuous electrocardiogram (ECG) data and examined the impact on the statistical power of the assay. METHODS: Continuous ECG data were collected from a validation study in 6 cynomolgus monkeys using jacketed telemetry...
January 5, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28060863/the-systematic-evaluation-of-identifying-the-infarct-related-artery-utilizing-cardiac-magnetic-resonance-in-patients-presenting-with-st-elevation-myocardial-infarction
#3
Carine E Hamo, Igor Klem, Sunil V Rao, Vincent Songco, Samer Najjar, Edward G Lakatta, Subha V Raman, Robert A Harrington, John F Heitner
BACKGROUND: Identification of the infarct-related artery (IRA) in patients with STEMI using coronary angiography (CA) is often based on the ECG and can be challenging in patients with severe multi-vessel disease. The current study aimed to determine how often percutaneous intervention (PCI) is performed in a coronary artery different from the artery supplying the territory of acute infarction on cardiac magnetic resonance imaging (CMR). METHODS: We evaluated 113 patients from the Reduction of infarct Expansion and Ventricular remodeling with Erythropoetin After Large myocardial infarction (REVEAL) trial, who underwent CMR within 4±2 days of revascularization...
2017: PloS One
https://www.readbyqxmd.com/read/28057231/anterior-t-wave-inversion-in-young-white%C3%A2-athletes-and-nonathletes-prevalence-and-significance
#4
Aneil Malhotra, Harshil Dhutia, Sabiha Gati, Tee-Joo Yeo, Helder Dores, Rachel Bastiaenen, Rajay Narain, Ahmed Merghani, Gherardo Finocchiaro, Nabeel Sheikh, Alexandros Steriotis, Abbas Zaidi, Lynne Millar, Elijah Behr, Maite Tome, Michael Papadakis, Sanjay Sharma
BACKGROUND: Anterior T-wave inversion (ATWI) on electrocardiography (ECG) in young white adults raises the possibility of cardiomyopathy, specifically arrhythmogenic right ventricular cardiomyopathy (ARVC). Whereas the 2010 European consensus recommendations for ECG interpretation in young athletes state that ATWI beyond lead V1 warrants further investigation, the prevalence and significance of ATWI have never been reported in a large population of asymptomatic whites. OBJECTIVES: This study investigated the prevalence and significance of ATWI in a large cohort of young, white adults including athletes...
January 3, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28045334/design-and-validation-of-a-three-instrument-toolkit-for-the-assessment-of-competence-in-electrocardiogram-rhythm-recognition
#5
José M Hernández-Padilla, José Granero-Molina, Verónica V Márquez-Hernández, Fiona Suthers, Olga M López-Entrambasaguas, Cayetano Fernández-Sola
BACKGROUND: Rapid and accurate interpretation of cardiac arrhythmias by nurses has been linked with safe practice and positive patient outcomes. Although training in electrocardiogram rhythm recognition is part of most undergraduate nursing programmes, research continues to suggest that nurses and nursing students lack competence in recognising cardiac rhythms. In order to promote patient safety, nursing educators must develop valid and reliable assessment tools that allow the rigorous assessment of this competence before nursing students are allowed to practise without supervision...
January 1, 2017: European Journal of Cardiovascular Nursing
https://www.readbyqxmd.com/read/28044401/atrioventricular-synchrony-in-the-background-of-ventricular-noise-and-undersensing
#6
Paweł T Matusik, Andrzej Ząbek, Patrycja S Matusik, Barbara Małecka, Jacek Lelakowski
The 24-hr electrocardiogram (ECG) interpretation in patients with double-chamber pacemakers may be challenging. The difficulty increases if not well-known pacemaker algorithm and device malfunction coexist. We show atrial synchronization pace (ASP) in a patient with ventricular lead damage. We provide detailed description of electrocardiogram and intracardiac electrogram. ASP may confuse 24-hr ECG monitoring interpretation, especially in patients with ventricular lead dysfunction.
January 3, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28042584/st-elevation-myocardial-infarction-in-situs-inversus-dextrocardia-a-case-report
#7
Koh Keng Tat, Asri Said, Oon Yen Yee, Siti Nadia Binti Che Adinan, Ong Tiong Kiam
ST-elevation myocardial infarction (STEMI) in situs inversus dextrocardia is a rare combination and poses many challenges in terms of diagnosis and management. These include the early detection of dextrocardia as well as the interpretation of the ECG. In addition, percutaneous coronary intervention could be challenging in the setting of dextrocardia because of diffi culty in cannulating the coronary arteries, selection of catheters, catheter manipulation, image acquisition and interpretation.
December 2016: ASEAN Heart Journal: Official Journal of the ASEAN Federation of Cardiology
https://www.readbyqxmd.com/read/28039856/an-automatic-classifier-of-emotions-built-from-entropy-of-noise
#8
Jacqueline Ferreira, Susana Brás, Carlos F Silva, Sandra C Soares
The electrocardiogram (ECG) signal has been widely used to study the physiological substrates of emotion. However, searching for better filtering techniques in order to obtain a signal with better quality and with the maximum relevant information remains an important issue for researchers in this field. Signal processing is largely performed for ECG analysis and interpretation, but this process can be susceptible to error in the delineation phase. In addition, it can lead to the loss of important information that is usually considered as noise and, consequently, discarded from the analysis...
December 31, 2016: Psychophysiology
https://www.readbyqxmd.com/read/28035635/ecg-signal-denoising-via-empirical-wavelet-transform
#9
Omkar Singh, Ramesh Kumar Sunkaria
This paper presents new methods for baseline wander correction and powerline interference reduction in electrocardiogram (ECG) signals using empirical wavelet transform (EWT). During data acquisition of ECG signal, various noise sources such as powerline interference, baseline wander and muscle artifacts contaminate the information bearing ECG signal. For better analysis and interpretation, the ECG signal must be free of noise. In the present work, a new approach is used to filter baseline wander and power line interference from the ECG signal...
December 29, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28011829/influence-of-the-earliest-right-atrial-activation-site-and-its-proximity-to-interatrial-connections-on-p-wave-morphology
#10
Axel Loewe, Martin W Krueger, Fredrik Holmqvist, Olaf Dössel, Gunnar Seemann, Pyotr G Platonov
AIMS: P-wave morphology correlates with the risk for atrial fibrillation (AF). Left atrial (LA) enlargement could explain both the higher risk for AF and higher P-wave terminal force (PTF) in lead V1. However, PTF-V1 has been shown to correlate poorly with LA size. We hypothesize that PTF-V1 is also affected by the earliest activated site (EAS) in the right atrium and its proximity to inter-atrial connections (IAC), which both show tremendous variability. METHODS AND RESULTS: Atrial excitation was triggered from seven different EAS in a cohort of eight anatomically personalized computational models...
December 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28011828/changes-in-p-wave-morphology-after-pulmonary-vein-isolation-insights-from-computer-simulations
#11
Mirabeau Saha, Giulio Conte, Maria Luce Caputo, François Regoli, Rolf Krause, Angelo Auricchio, Vincent Jacquemet
AIMS: Apparently conflicting clinical measurements of P-wave duration (PWD) pre- vs. post-ablation have been reported. To assist the interpretation of these clinical data, we used a computer model of the atria and torso to simulate P waves before and after pulmonary vein (PV) isolation. METHODS AND RESULTS: Twenty ablation patterns were designed (segmental or ipsilateral ablation; five distances to PV sleeves; addition of a roof line or not). Possible PV reconnections were introduced as gaps in the ablation lines...
December 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28011585/the-role-of-sympathetic-and-vagal-cardiac-control-on-complexity-of-heart-rate-dynamics
#12
Luiz Eduardo Virgilio Silva, Carlos Alberto Aguiar Silva, Helio C Salgado, Rubens Fazan
Analysis of heart rate variability (HRV) by nonlinear approaches has been gaining interest due to their ability to extract additional information from heart rate (HR) dynamics, not detectable by traditional approaches. Nevertheless, the physiological interpretation of nonlinear approaches remains unclear. Therefore, we propose long-term (60 min) protocols involving selective blockade of cardiac autonomic receptors to investigate the contribution of sympathetic and parasympathetic function upon nonlinear dynamics of HRV...
December 23, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27968777/noninvasive-epicardial-and-endocardial-electrocardiographic-imaging-of-scar-related-ventricular-tachycardia
#13
Linwei Wang, Omar A Gharbia, B Milan Horáček, John L Sapp
BACKGROUND: The majority of life-threatening ventricular tachycardias (VTs) are sustained by heterogeneous scar substrates with narrow strands of surviving tissue. An effective treatment for scar-related VT is to modify the underlying scar substrate by catheter ablation. If activation sequence and entrainment mapping can be performed during sustained VT, the exit and isthmus of the circuit can often be identified. However, with invasive catheter mapping, only monomorphic VT that is hemodynamically stable can be mapped in this manner...
November 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/27968776/the-electrocardiogram-of-the-neonate-and-infant
#14
Konrad Brockmeier, Rewa Nazal, Narayanswami Sreeram
The ECG in children has a number of characteristic differences compared to the ECG of the adult. The transition of the ECG in neonates after birth represents dynamic changes of the circulatory system due to the postnatal adaptation, different physiologic properties of the fetal and neonatal myocardium, the location and orientation of the heart in the chest and influence of body mass during that period and later on in childhood. The complexity of the changes implies a broad variation of ECG changes during the first days and weeks of life, whose interpretation requires expert knowledge...
November 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/27920449/a-comparison-of-the-european-society-of-cardiology-the-seattle-and-the-refined-criteria-for-interpreting-the-athlete-s-ecg-in-a-pre-participation-screening-programme
#15
https://www.readbyqxmd.com/read/27917921/exploring-the-relationship-between-eye-movements-and-electrocardiogram-interpretation-accuracy
#16
Alan Davies, Gavin Brown, Markel Vigo, Simon Harper, Laura Horseman, Bruno Splendiani, Elspeth Hill, Caroline Jay
Interpretation of electrocardiograms (ECGs) is a complex task involving visual inspection. This paper aims to improve understanding of how practitioners perceive ECGs, and determine whether visual behaviour can indicate differences in interpretation accuracy. A group of healthcare practitioners (n = 31) who interpret ECGs as part of their clinical role were shown 11 commonly encountered ECGs on a computer screen. The participants' eye movement data were recorded as they viewed the ECGs and attempted interpretation...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27902494/an-ultrasound-look-at-korotkoff-sounds-the-role-of-pulse-wave-velocity-and-flow-turbulence
#17
Amir Benmira, Antonia Perez-Martin, Iris Schuster, Florent Veye, Jean Triboulet, Nicolas Berron, Isabelle Aichoun, Sarah Coudray, Jérémy Laurent, Fethi Bereksi-Reguig, Michel Dauzat
AIMS: The aim of this study was to analyze the temporal relationships between pressure, flow, and Korotkoff sounds, providing clues for their comprehensive interpretation. MATERIALS AND METHODS: When measuring blood pressure in a group of 23 volunteers, we used duplex Doppler ultrasonography to assess, under the arm-cuff, the brachial artery flow, diameter changes, and local pulse wave velocity (PWV), while recording Korotkoff sounds 10 cm downstream together with cuff pressure and ECG...
November 29, 2016: Blood Pressure Monitoring
https://www.readbyqxmd.com/read/27899826/an-elective-course-in-cardiovascular-electrophysiology-for-pharmacy-learners
#18
Diptiman D Bose
Objective. To implement an integrated, comprehensive, and learner-centered elective course focused at exposing learners to the interpretation of electrocardiograms and highlighting the mechanisms underlining the abnormal electrophysiological events. Design. Learners were presented with foundational information on the mechanisms underlying electrophysiological changes associated with the development of arrhythmias. They then discussed the interpretation of electrocardiogram (ECG) recordings and diagnosis of cardiovascular events...
October 25, 2016: American Journal of Pharmaceutical Education
https://www.readbyqxmd.com/read/27894294/appropriate-threshold-levels-of-cardiac-beat-to-beat-variation-in-semi-automatic-analysis-of-equine-ecg-recordings
#19
Mette Flethøj, Jørgen K Kanters, Philip J Pedersen, Maria M Haugaard, Helena Carstensen, Lisbeth H Olsen, Rikke Buhl
BACKGROUND: Although premature beats are a matter of concern in horses, the interpretation of equine ECG recordings is complicated by a lack of standardized analysis criteria and a limited knowledge of the normal beat-to-beat variation of equine cardiac rhythm. The purpose of this study was to determine the appropriate threshold levels of maximum acceptable deviation of RR intervals in equine ECG analysis, and to evaluate a novel two-step timing algorithm by quantifying the frequency of arrhythmias in a cohort of healthy adult endurance horses...
November 28, 2016: BMC Veterinary Research
https://www.readbyqxmd.com/read/27893401/heartbeat-classification-using-abstract-features-from-the-abductive-interpretation-of-the-ecg
#20
Tomas Teijeiro, Paulo Felix, Jesus Presedo, Daniel Castro
: This paper aims to prove that automatic beat classification on ECG signals can be effectively solved with a pure knowledge-based approach, using an appropriate set of abstract features obtained from the interpretation of the physiological processes underlying the signal. METHODS: A set of qualitative morphological and rhythm features are obtained for each heartbeat as a result of the abductive interpretation of the ECG. Then, a QRS clustering algorithm is applied in order to reduce the effect of possible errors in the interpretation...
November 21, 2016: IEEE Journal of Biomedical and Health Informatics
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