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https://www.readbyqxmd.com/read/28087552/screening-for-atrial-fibrillation-using-economical-and-accurate-technology-safety-a-pilot-study
#1
Mark Lown, Arthur Yue, George Lewith, Paul Little, Mike Moore
INTRODUCTION: Atrial fibrillation (AF) is a cause of stroke and a marker of atherosclerosis and of all patients with stroke, around 17% have AF. The screening and treatment of AF could prevent about 12% of all strokes. Several relatively low-cost devices with good accuracy now exist which can detect AF including WatchBP and AliveCor. However, they can only measure the ECG or pulse over short time periods. Inexpensive devices such as heart rate monitors, which are widely available, can measure heart rate for prolonged periods and may have potential in screening for AF...
January 13, 2017: BMJ Open
https://www.readbyqxmd.com/read/28076295/convolutive-blind-source-separation-of-surface-emg-measurements-of-the-respiratory-muscles
#2
Eike Petersen, Herbert Buchner, Marcus Eger, Philipp Rostalski
Electromyography (EMG) has long been used for the assessment of muscle function and activity and has recently been applied to the control of medical ventilation. For this application, the EMG signal is usually recorded invasively by means of electrodes on a nasogastric tube which is placed inside the esophagus in order to minimize noise and crosstalk from other muscles. Replacing these invasive measurements with an EMG signal obtained non-invasively on the body surface is difficult and requires techniques for signal separation in order to reconstruct the contributions of the individual respiratory muscles...
January 11, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28055987/heart-beat-classification-from-single-lead-ecg-using-the-synchrosqueezing-transform
#3
Christophe L Herry, Martin Frasch, Andrew Je Seely, Hau-Tieng Wu
The processing of ECG signal provides a wealth of information on cardiac function and overall cardiovascular health. While multi-lead ECG recordings are often necessary for a proper assessment of cardiac rhythms, they are not always available or practical, for example in fetal ECG applications. Moreover, a wide range of small non-obtrusive single-lead ECG ambulatory monitoring devices are now available, from which heart rate variability (HRV) and other health-related metrics are derived. Proper beat detection and classification of abnormal rhythms is important for reliable HRV assessment and can be challenging in single-lead ECG monitoring devices...
January 5, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28047456/mo-de-207a-06-ecg-gated-ct-reconstruction-for-a-c-arm-inverse-geometry-x-ray-system
#4
J M Slagowski, Dap Dunkerley
PURPOSE: To obtain ECG-gated CT images from truncated projection data acquired with a C-arm based inverse geometry fluoroscopy system, for the purpose of cardiac chamber mapping in interventional procedures. METHODS: Scanning-beam digital x-ray (SBDX) is an inverse geometry fluoroscopy system with a scanned multisource x-ray tube and a photon-counting detector mounted to a C-arm. In the proposed method, SBDX short-scan rotational acquisition is performed followed by inverse geometry CT (IGCT) reconstruction and segmentation of contrast-enhanced objects...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044401/atrioventricular-synchrony-in-the-background-of-ventricular-noise-and-undersensing
#5
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/28040865/cse-database-extended-annotations-and-new-recommendations-for-ecg-software-testing
#6
Radovan Smíšek, Lucie Maršánová, Andrea Němcová, Martin Vítek, Jiří Kozumplík, Marie Nováková
Nowadays, cardiovascular diseases represent the most common cause of death in western countries. Among various examination techniques, electrocardiography (ECG) is still a highly valuable tool used for the diagnosis of many cardiovascular disorders. In order to diagnose a person based on ECG, cardiologists can use automatic diagnostic algorithms. Research in this area is still necessary. In order to compare various algorithms correctly, it is necessary to test them on standard annotated databases, such as the Common Standards for Quantitative Electrocardiography (CSE) database...
December 31, 2016: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28030578/use-of-ecg-and-other-simple-non-invasive-tools-to-assess-pulmonary-hypertension
#7
Gabor Kovacs, Alexander Avian, Vasile Foris, Maria Tscherner, Xhylsime Kqiku, Philipp Douschan, Gerhard Bachmaier, Andrea Olschewski, Marco Matucci-Cerinic, Horst Olschewski
BACKGROUND: There is a broad consensus that pulmonary hypertension (PH) is to be diagnosed by right heart catheterization (RHC) and that the most important non-invasive tool is echocardiography. However, the role of simple non-invasive tools in the work-up of PH is not clearly defined. We hypothesized that the use of simple non-invasive techniques may help to guide important decisions in the diagnostics of pulmonary hypertension. OBJECTIVES: We aimed to develop an algorithm with the use of simple, non-invasive tools in order to identify patients with very high or very low likelihood of PH...
2016: PloS One
https://www.readbyqxmd.com/read/28029558/radiation-dose-levels-of-retrospectively-ecg-gated-coronary-ct-angiography-using-70-kvp-tube-voltage-in-patients-with-high-or-irregular-heart-rates
#8
Mathias Meyer, Holger Haubenreisser, Uwe Joseph Schoepf, Rozemarijn Vliegenthart, Melissa M Ong, Christina Doesch, Sonja Sudarski, Martin Borggrefe, Stefan O Schoenberg, Thomas Henzler
RATIONALE AND OBJECTIVES: Despite ongoing technical refinements, coronary computed tomography angiography (cCTA) remains challenging in its diagnostic value by electrocardiographic (ECG) misregistration and motion artifacts, which commonly occur in patients with atrial fibrillation and high or irregular heart rates. The aim of this study was to evaluate the radiation dose and the number of inconclusive coronary segments at cCTA using retrospective ECG gating at 100 and 70 kV. MATERIALS AND METHODS: With institutional review board approval, 154 patients (median age 54 years, 98 men) with high or irregular heart rate prospectively underwent retrospectively ECG-gated cCTA without tube current modulation on a third-generation dual-source computed tomography (DSCT) system at 70 kV (n = 103) or on a second-generation DSCT system at 100 kV (n = 51)...
October 28, 2016: Academic Radiology
https://www.readbyqxmd.com/read/28028497/providing-an-efficient-algorithm-for-finding-r-peaks-in-ecg-signals-and-detecting-ventricular-abnormalities-with-morphological-features
#9
Mohammad Pooyan, Fateme Akhoondi
Ventricular arrhythmias are one of the most important causes of annual deaths in the world, which may lead to sudden cardiac deaths. Accurate and early diagnosis of ventricular arrhythmias in heart diseases is essential for preventing mortality in cardiac patients. Ventricular activity on the electrocardiogram (ECG) signal is in the interval from the beginning of QRS complex to T wave end. Variations in the ECG signal and its features may indicate heart condition of patients. The first step to extract features of ECG in time domain is finding R peaks...
October 2016: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28027746/image-quality-of-ct-angiography-using-model-based-iterative-reconstruction-in-infants-with-congenital-heart-disease-comparison-with-filtered-back-projection-and-hybrid-iterative-reconstruction
#10
Qianjun Jia, Jian Zhuang, Jun Jiang, Jiahua Li, Meiping Huang, Changhong Liang
PURPOSE: To compare the image quality, rate of coronary artery visualization and diagnostic accuracy of 256-slice multi-detector computed tomography angiography (CTA) with prospective electrocardiographic (ECG) triggering at a tube voltage of 80kVp between 3 reconstruction algorithms (filtered back projection (FBP), hybrid iterative reconstruction (iDose(4)) and iterative model reconstruction (IMR)) in infants with congenital heart disease (CHD). METHODS: Fifty-one infants with CHD who underwent cardiac CTA in our institution between December 2014 and March 2015 were included...
January 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28024553/sustained-performance-of-a-physicianless-system-of-automated-prehospital-stemi-diagnosis-and-catheterization-laboratory-activation
#11
Brian J Potter, Alexis Matteau, Samer Mansour, Charbel Naim, Mounir Riahi, Richard Essiambre, Martine Montigny, Isabelle Sareault, François Gobeil
BACKGROUND: Treatment times for primary percutaneous coronary intervention frequently exceed the recommended maximum delay. Automated "physicianless" systems of prehospital cardiac catheterization laboratory (CCL) activation show promise, but have been met with resistance over concerns regarding the potential for false positive and inappropriate activations (IAs). METHODS: From 2010 to 2015, first responders performed electrocardiograms (ECGs) in the field for all patients with a complaint of chest pain or dyspnea...
January 2017: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/28012294/derivation-of-respiration-rate-from-ambulatory-ecg-and-ppg-using-ensemble-empirical-mode-decomposition-comparison-and-fusion
#12
Christina Orphanidou
A new method for extracting the respiratory rate from ECG and PPG obtained via wearable sensors is presented. The proposed technique employs Ensemble Empirical Mode Decomposition in order to identify the respiration "mode" from the noise-corrupted Heart Rate Variability/Pulse Rate Variability and Amplitude Modulation signals extracted from ECG and PPG signals. The technique was validated with respect to a Respiratory Impedance Pneumography (RIP) signal using the mean absolute and the average relative errors for a group ambulatory hospital patients...
December 7, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28002025/increased-beat-to-beat-t-wave-variability-in-myocardial-infarction-patients
#13
Muhammad A Hasan, Derek Abbott, Mathias Baumert, Sridhar Krishnan
The purpose of this study was to investigate the beat-to-beat variability of T-waves (TWV) and to assess the diagnostic capabilities of T-wave-based features for myocardial infarction (MI). A total of 148 recordings of standard 12-lead electrocardiograms (ECGs) from 79 MI patients (22 females, mean age 63±12 years; 57 males, mean age 57±10 years) and 69 recordings from healthy subjects (HS) (17 females, 42±18 years; 52 males, 40±13 years) were studied. For the quantification of beat-to-beat QT intervals in ECG signal, a template-matching algorithm was applied...
December 21, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27984888/orbit-orbit-relativistic-correction-calculated-with-all-electron-molecular-explicitly-correlated-gaussians
#14
Monika Stanke, Ewa Palikot, Dariusz Kȩdziera, Ludwik Adamowicz
An algorithm for calculating the first-order electronic orbit-orbit magnetic interaction correction for an electronic wave function expanded in terms of all-electron explicitly correlated molecular Gaussian (ECG) functions with shifted centers is derived and implemented. The algorithm is tested in calculations concerning the H2 molecule. It is also applied in calculations for LiH and H3(+) molecular systems. The implementation completes our work on the leading relativistic correction for ECGs and paves the way for very accurate ECG calculations of ground and excited potential energy surfaces (PESs) of small molecules with two and more nuclei and two and more electrons, such as HeH(-), H3(+), HeH2(+), and LiH2(+)...
December 14, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27983754/estimating-the-prevalence-of-atrial-fibrillation-from-a-three-class-mixture-model-for-repeated-diagnoses
#15
Liang Li, Huzhang Mao, Hemant Ishwaran, Jeevanantham Rajeswaran, John Ehrlinger, Eugene H Blackstone
Atrial fibrillation (AF) is an abnormal heart rhythm characterized by rapid and irregular heartbeat, with or without perceivable symptoms. In clinical practice, the electrocardiogram (ECG) is often used for diagnosis of AF. Since the AF often arrives as recurrent episodes of varying frequency and duration and only the episodes that occur at the time of ECG can be detected, the AF is often underdiagnosed when a limited number of repeated ECGs are used. In studies evaluating the efficacy of AF ablation surgery, each patient undergoes multiple ECGs and the AF status at the time of ECG is recorded...
December 16, 2016: Biometrical Journal. Biometrische Zeitschrift
https://www.readbyqxmd.com/read/27970330/tct-162-the-glasgow-12-lead-ecg-analysis-algorithm-alone-is-not-suitable-for-pre-hospital-cardiac-catheter-laboratory-activation-for-stemi
#16
Amir Faour, Oliver Gibbs, Callum Cherrett, Karen Lintern, Christian Mussap, Rohan Rajaratnam, Craig Juergens, John French
No abstract text is available yet for this article.
November 1, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27968784/improving-stemi-screening-by-utilizing-a-diagnostic-ecg-algorithm-in-the-monitoring-environment
#17
Reza Firoozabadi, Richard E Gregg, Saeed Babaeizadeh
No abstract text is available yet for this article.
November 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/27959833/adaptive-spectro-temporal-filtering-for-electrocardiogram-signal-enhancement
#18
Diana Tobon Vallejo, Tiago Falk
Advances in low-cost portable electrocardiogram (ECG) devices have opened doors for numerous new applications, including fitness tracking, remote health, and peak athletic performance monitoring, to name a few. Many such devices, however, have been shown to be highly contaminated by movement and/or muscle contraction artifacts, which in turn, can lead to erroneous heart rate and heart rate variability (HRV) analyses. Here, we propose a new denoising method based on adaptive spectrotemporal filtering for ECG enhancement...
December 9, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/27957405/smart-helmet-wearable-multichannel-ecg-and-eeg
#19
Wilhelm Von Rosenberg, Theerasak Chanwimalueang, Valentin Goverdovsky, David Looney, David Sharp, Danilo P Mandic
Modern wearable technologies have enabled continuous recording of vital signs, however, for activities such as cycling, motor-racing, or military engagement, a helmet with embedded sensors would provide maximum convenience and the opportunity to monitor simultaneously both the vital signs and the electroencephalogram (EEG). To this end, we investigate the feasibility of recording the electrocardiogram (ECG), respiration, and EEG from face-lead locations, by embedding multiple electrodes within a standard helmet...
2016: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/27941217/implementation-and-verification-of-an-enhanced-algorithm-for-the-automatic-computation-of-rr-interval-series-derived-from-24%C3%A2-h-12-lead-ecgs
#20
Stefan Hagmair, Matthias C Braunisch, Martin Bachler, Christoph Schmaderer, Anna-Lena Hasenau, Axel Bauer, Kostantinos D Rizas, Siegfried Wassertheurer, Christopher C Mayer
An important tool in early diagnosis of cardiac dysfunctions is the analysis of electrocardiograms (ECGs) obtained from ambulatory long-term recordings. Heart rate variability (HRV) analysis became a significant tool for assessing the cardiac health. The usefulness of HRV assessment for the prediction of cardiovascular events in end-stage renal disease patients was previously reported. The aim of this work is to verify an enhanced algorithm to obtain an RR-interval time series in a fully automated manner. The multi-lead corrected R-peaks of each ECG lead are used for RR-series computation and the algorithm is verified by a comparison with manually reviewed reference RR-time series...
January 2017: Physiological Measurement
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