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https://www.readbyqxmd.com/read/28918214/efficient-noise-tolerant-estimation-of-heart-rate-variability-using-single-channel-photoplethysmography
#1
Reza Firoozabadi, Eric D Helfenbein, Saeed Babaeizadeh
BACKGROUND: The feasibility of using photoplethysmography (PPG) for estimating heart rate variability (HRV) has been the subject of many recent studies with contradicting results. Accurate measurement of cardiac cycles is more challenging in PPG than ECG due to its inherent characteristics. METHODS: We developed a PPG-only algorithm by computing a robust set of medians of the interbeat intervals between adjacent peaks, upslopes, and troughs. Abnormal intervals are detected and excluded by applying our criteria...
August 18, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28917561/cardiac-rhythm-analysis-during-ongoing-cardiopulmonary-resuscitation-using-the-analysis-during-compressions-with-fast-reconfirmation-adc-fr-technology
#2
Francesca Fumagalli, Annemarie E Silver, Qing Tan, Naveed Zaidi, Giuseppe Ristagno
BACKGROUND: Pauses in chest compressions (CCs) have a negative association with survival from cardiac arrest (CA). ECG rhythm analysis and defibrillator charging are significant contributors to CC pauses. OBJECTIVE: Accuracy of the "Analysis During Compressions with Fast Reconfirmation" (ADC-FR) algorithm, which features automated rhythm analysis and charging during CCs to reduce CC pauses, was retrospectively determined in a large database of ECGs from 2,701 out-of-hospital CAs...
September 13, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28904525/knowing-about-device-algorithms-to-understand-the-rhythm-and-role-of-managed-ventricular-pacing
#3
Antoine Kossaify, Hiba Hamdar
A 66-year-old patient with a DR pacemaker for intermittent atrioventricular block presented with an electrocardiogram (ECG) showing some P waves non followed by QRS complexes, raising suspicion of device dysfunction. The device was equipped with a special algorithm (Managed Ventricular Pacing; Medtronic), and the observed ECG tracing was a normal consequence of the function of such algorithms. Being aware of the function of specific algorithms is essential to adequately analyze rhythms.
2017: Clinical Medicine Insights. Case Reports
https://www.readbyqxmd.com/read/28903861/a-decision-support-system-and-rule-based-algorithm-to-augment-the-human-interpretation-of-the-12-lead-electrocardiogram
#4
Andrew W Cairns, Raymond R Bond, Dewar D Finlay, Daniel Guldenring, Fabio Badilini, Guido Libretti, Aaron J Peace, Stephen J Leslie
BACKGROUND: The 12-lead Electrocardiogram (ECG) has been used to detect cardiac abnormalities in the same format for more than 70years. However, due to the complex nature of 12-lead ECG interpretation, there is a significant cognitive workload required from the interpreter. This complexity in ECG interpretation often leads to errors in diagnosis and subsequent treatment. We have previously reported on the development of an ECG interpretation support system designed to augment the human interpretation process...
August 9, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28901670/specificity-of-wide-qrs-complex-tachycardia-criteria-and-algorithms-in-patients-with-ventricular-preexcitation
#5
Marek Jastrzębski, Paweł Moskal, Piotr Kukla, Kamil Fijorek, Roksana Kisiel, Danuta Czarnecka
BACKGROUND: Despite substantial progress in the field of differentiation between ventricular tachycardia (VT) and supraventricular tachycardia (SVT) with wide QRS complexes, differentiation between VT and preexcited SVT remains largely unresolved due to significant overlap in QRS morphology. Our aim was to assess the specificities of various single ECG criteria and sets of criteria (Brugada algorithm, aVR algorithm, Steurer algorithm, and the VT score) for diagnosis of VT in a sizable cohort of patients with preexcitation...
September 12, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28901611/consistency-based-respiratory-motion-estimation-in-rotational-angiography
#6
Mathias Unberath, André Aichert, Stephan Achenbach, Andreas Maier
PURPOSE: Rotational coronary angiography enables 3D reconstruction but suffers from intra-scan cardiac and respiratory motion. While gating handles cardiac motion, respiratory motion requires compensation. State-of-the-art algorithms rely on 3D-2D registration that depends on initial reconstructions of sufficient quality. We propose a compensation method that is applied directly in projection domain. It overcomes the need for reconstruction and thus complements the state-of-the-art. METHODS: Virtual single-frame background subtraction based on vessel segmentation and spectral deconvolution yields non-truncated images of the contrasted lumen...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28884264/ambulatory-screening-tool-for-sleep-apnea-analyzing-a-single-lead-electrocardiogram-signal-ecg
#7
Solveig Magnusdottir, Hugi Hilmisson
STUDY OBJECTIVE: The goal was to determine the utility and accuracy of automated analysis of single-lead electrocardiogram (ECG) data using two algorithms, cardiopulmonary coupling (CPC), and cyclic variation of heart rate (CVHR) to identify sleep apnea (SA). METHODS: The CPC-CVHR algorithms were applied to identify SA by analyzing ECG from diagnostic polysomnography (PSG) from 47 subjects. The studies were rescored according to updated AASM scoring rules, both manually by a certified technologist and using an FDA-approved automated scoring software, Somnolyzer (Philips Inc...
September 7, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/28884233/in-vivo-strain-analysis-of-dilated-ascending-thoracic-aorta-by-ecg-gated-ct-angiographic-imaging
#8
Salvatore Pasta, Valentina Agnese, Marzio Di Giuseppe, Giovanni Gentile, Giuseppe M Raffa, Diego Bellavia, Michele Pilato
Accurate assessment of aortic extensibility is a requisite first step for elucidating the pathophysiology of an ascending thoracic aortic aneurysm (ATAA). This study aimed to develop a framework for the in vivo evaluation of the full-field distribution of the aortic wall strain by imaging analysis of electrocardiographic- (ECG) gated thoracic data of 34 patients with ATAA. Seven healthy controls (i.e., non-aneurysmal aorta) from patients who underwent ECG-gated CT angiography for coronary artery diseases were included for comparison...
September 7, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28874683/inter-patient-ecg-heartbeat-classification-with-temporal-vcg-optimized-by-pso
#9
Gabriel Garcia, Gladston Moreira, David Menotti, Eduardo Luz
Classifying arrhythmias can be a tough task for a human being and automating this task is highly desirable. Nevertheless fully automatic arrhythmia classification through Electrocardiogram (ECG) signals is a challenging task when the inter-patient paradigm is considered. For the inter-patient paradigm, classifiers are evaluated on signals of unknown subjects, resembling the real world scenario. In this work, we explore a novel ECG representation based on vectorcardiogram (VCG), called temporal vectorcardiogram (TVCG), along with a complex network for feature extraction...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28868151/motion-artefact-removals-for-wearable-ecg-using-stationary-wavelet-transform
#10
Shuto Nagai, Daisuke Anzai, Jianqing Wang
Wearable Electrocardiogram (ECG) is attracting much attention in daily healthcare applications. From the viewpoint of long-term use, it is desired that the electrodes are non-contact with the human body. In this study, the authors propose an algorithm using the stationary wavelet transform (SWT) to remove motion artefact superimposed on ECG signal when using non-contact capacitively coupling electrodes. The authors evaluate the effect on motion artefact removal of this algorithm by applying it to various ECG signals with motion artefacts superimposed...
August 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28868150/electrocardiograph-signal-denoising-based-on-sparse-decomposition
#11
Junjiang Zhu, Xiaolu Li
Noise in ECG signals will affect the result of post-processing if left untreated. Since ECG is highly subjective, the linear denoising method with a specific threshold working well on one subject could fail on another. Therefore, in this Letter, sparse-based method, which represents every segment of signal using different linear combinations of atoms from a dictionary, is used to denoise ECG signals, with a view to myoelectric interference existing in ECG signals. Firstly, a denoising model for ECG signals is constructed...
August 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28867990/ecg-parameters-for-malignant-ventricular-arrhythmias-a-comprehensive-review
#12
REVIEW
Satria Mandala, Tham Cai Di
Many studies showed electrocardiogram (ECG) parameters are useful for predicting fatal ventricular arrhythmias (VAs). However, the studies have several shortcomings. Firstly, all studies lack of effective way to present behavior of various ECG parameters prior to the occurrence of the VAs. Secondly, they also lack of discussion on how to consider the parameters as abnormal. Thirdly, the reports do not include approaches to increase the detection accuracy for the abnormal patterns. The purpose of this study is to address the aforementioned issues...
2017: Journal of Medical and Biological Engineering
https://www.readbyqxmd.com/read/28865333/assessing-mood-symptoms-through-heartbeat-dynamics-an-hrv-study-on-cardiosurgical-patients
#13
Claudio Gentili, Simone Messerotti Benvenuti, Daniela Palomba, Alberto Greco, Enzo Pasquale Scilingo, Gaetano Valenza
BACKGROUND: Heart Rate Variability (HRV) is reduced both in depression and in coronary heart disease (CHD) suggesting common pathophysiological mechanisms for the two disorders. Within CHD, cardiac surgery patients (CSP) with postoperative depression are at greater risk of adverse cardiac events. Therefore, CSP would especially benefit from depression early diagnosis. Here we tested whether HRV-multi-feature analysis discriminates CSP with or without depression and provides an effective estimation of symptoms severity...
August 26, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28863167/the-development-and-validation-of-an-easy-to-use-automatic-qt-interval-algorithm
#14
Ben J M Hermans, Arja S Vink, Frank C Bennis, Luc H Filippini, Veronique M F Meijborg, Arthur A M Wilde, Laurent Pison, Pieter G Postema, Tammo Delhaas
BACKGROUND: To evaluate QT-interval dynamics in patients and in drug safety analysis, beat-to-beat QT-interval measurements are increasingly used. However, interobserver differences, aberrant T-wave morphologies and changes in heart axis might hamper accurate QT-interval measurements. OBJECTIVE: To develop and validate a QT-interval algorithm robust to heart axis orientation and T-wave morphology that can be applied on a beat-to-beat basis. METHODS: Additionally to standard ECG leads, the root mean square (ECGRMS), standard deviation and vectorcardiogram were used...
2017: PloS One
https://www.readbyqxmd.com/read/28851729/assessment-of-remote-heart-rhythm-sampling-using-the-alivecor-heart-monitor-to-screen-for-atrial-fibrillation-the-rehearse-af-study
#15
Julian P J Halcox, Kathie Wareham, Antonia Cardew, Mark Gilmore, James P Barry, Ceri Phillips, Michael B Gravenor
Background -Asymptomatic atrial fibrillation (AF) is increasingly common in the aging population and implicated in many ischemic strokes. Earlier identification of AF with appropriate anticoagulation may decrease stroke morbidity and mortality. Methods -We conducted a randomized controlled trial of AF screening using an AliveCor Kardia monitor attached to a WiFi-enabled iPod to obtain ECGs (iECGs) in ambulatory patients. Patients ≥65 years of age with a CHADS-VASc score ≥2 free from AF were randomized to the iECG arm or routine care (RC)...
August 28, 2017: Circulation
https://www.readbyqxmd.com/read/28845370/seismocardiography-based-cardiac-computed-tomography-gating-using-patient-specific-template-identification-and-detection
#16
Jingting Yao, Srini Tridandapani, Carson A Wick, Pamela T Bhatti
To more accurately trigger cardiac computed tomography angiography (CTA) than electrocardiography (ECG) alone, a sub-system is proposed as an intermediate step toward fusing ECG with seismocardiography (SCG). Accurate prediction of quiescent phases is crucial to prospectively gating CTA, which is susceptible to cardiac motion and, thus, can affect the diagnostic quality of images. The key innovation of this sub-system is that it identifies the SCG waveform corresponding to heart sounds and determines their phases within the cardiac cycles...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/28842191/removal-of-bcg-artefact-from-concurrent-fmri-eeg-recordings-based-on-emd-and-pca
#17
Ehtasham Javed, Ibrahima Faye, Aamir Saeed Malik, Jafri Malin Abdullah
BACKGROUND: Simultaneous electroencephalography (EEG) and functional magnetic resonance image (fMRI) acquisitions provide better insight into brain dynamics. Some artefacts due to simultaneous acquisition pose a threat to the quality of the data. One such problematic artefact is the ballistocardiogram (BCG) artefact. METHODS: We developed a hybrid algorithm that combines features of empirical mode decomposition (EMD) with principal component analysis (PCA) to reduce the BCG artefact...
August 24, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28840587/study-design-and-rationale-for-biomedical-shirt-based-electrocardiography-monitoring-in-relevant-clinical-situations-ecg-shirt-study
#18
Paweł Balsam, Piotr Lodziński, Agata Tymińska, Krzysztof Ozierański, Łukasz Januszkiewicz, Renata Główczyńska, Katarzyna Wesołowska, Michał Peller, Radosław Pietrzak, Tomasz Książczyk, Sonia Borodzicz, Łukasz Kołtowski, Mariusz Borkowski, Bożena Werner, Grzegorz Opolski, Marcin Grabowski
BACKGROUND: Today, the main challenge for researchers is to develop new technologies which may help to improve the diagnoses of cardiovascular disease (CVD), thereby reducing healthcare costs and improving the quality of life for patients. This study aims to show the utility of biomedical shirt-based electrocardiography (ECG) monitoring of patients with CVD in different clinical situations using the Nuubo® ECG (nECG) system. METHODS: An investigator-initiated, multicentre, prospective observational study was carried out in a cardiology (adult and paediatric) and cardiac rehabilitation wards ...
August 25, 2017: Cardiology Journal
https://www.readbyqxmd.com/read/28838551/general-approach-to-a-wide-qrs-complex
#19
REVIEW
Roberto De Ponti, Giuseppe Bagliani, Luigi Padeletti, Andrea Natale
Wide QRS complex is present when the normal activation pattern is modified by various mechanisms and clinical conditions. Correct interpretation is crucial for appropriate decision making. When approaching an electrocardiogram (ECG) with wide complex tachycardia, one must differentiate between ventricular tachycardia and supraventricular tachycardia conducted with aberrancy. ECG criteria are used and algorithms developed to aid in differential diagnosis. They are based on finding ECG signs of ventriculoatrial dissociation and QRS morphologies inconsistent with classic bundle branch block...
September 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28838369/computer-interpreted-electrocardiograms-benefits-and-limitations
#20
REVIEW
Jürg Schläpfer, Hein J Wellens
Computerized interpretation of the electrocardiogram (CIE) was introduced to improve the correct interpretation of the electrocardiogram (ECG), facilitating health care decision making and reducing costs. Worldwide, millions of ECGs are recorded annually, with the majority automatically analyzed, followed by an immediate interpretation. Limitations in the diagnostic accuracy of CIE were soon recognized and still persist, despite ongoing improvement in ECG algorithms. Unfortunately, inexperienced physicians ordering the ECG may fail to recognize interpretation mistakes and accept the automated diagnosis without criticism...
August 29, 2017: Journal of the American College of Cardiology
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