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https://www.readbyqxmd.com/read/30523836/fetal-ecg-extraction-from-time-varying-and-low-rank-noninvasive-maternal-abdominal-recordings
#1
Fahimeh Jamshidian-Tehrani, Reza Sameni
Noninvasive fetal electrocardiography is emerging as a low-cost and high-accuracy technology for fetal cardiac monitoring. Signal processing techniques have been used over the past fifty years in this domain. The current major challenges of this domain, addressed in this study are: 1) fetal electrocardiogram (fECG) extraction from few numbers of maternal abdominal channels in low signal-to-noise ratios; 2) online fECG extraction; 3) automatic and online signal quality assessment and channel selection; 4) accurate and robust fetal R-peak detection and ECG parameter extraction...
November 8, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/30503652/severe-sinus-bradycardia-in-puumala-virus-infection
#2
Andréa Pastissier, Sébastien Humbert, Pauline Naudion, Nadine Meaux-Ruault, Marc Badoz, Nadine Magy-Bertrand
Puumala orthohantavirus (PUUV) is the most prevalent of the four species of zoonotic hantaviruses found in Europe, causing nephropathia epidemica, a mild form of hemorrhagic fever with acute kidney injury that presents with elevated serum creatinine level, proteinuria and hematuria. The febrile phase of the infection begins by flu-like syndrome, visual disturbance. Laboratory results can show thrombocytopenia. The oliguric phase with elevated serum creatinine level occurs then. Cardiac involvement is sometimes observed, especially ECG abnormality: transient T-waves inversion, generally in the lateral or inferior leads...
November 29, 2018: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/30497755/electrocardiomatrix-facilitates-qualitative-identification-of-diminished-heart-rate-variability-in-critically-ill-patients-shortly-before-cardiac-arrest
#3
Gang Xu, Sneha Dodaballapur, Temenuzhka Mihaylova, Jimo Borjigin
BACKGROUND: Although heart rate variability (HRV) has diagnostic and prognostic value for the assessment of cardiac risk, HRV analysis is not routinely performed in a hospital setting. Current HRV analysis methods are primarily quantitative; such methods are sensitive to signal contamination and require extensive post hoc processing. METHODS AND RESULTS: Raw electrocardiogram (ECG) data from the Sleep Heart Health Study was transformed into electrocardiomatrix (ECM), in which sequential cardiac cycles are aligned, in parallel, along a shared axis...
November 2018: Journal of Electrocardiology
https://www.readbyqxmd.com/read/30474554/feasibility-of-3d-black-blood-variable-refocusing-angle-fast-spin-echo-cardiovascular-magnetic-resonance-for-visualization-of-the-whole-heart-and-great-vessels-in-congenital-heart-disease
#4
Markus Henningsson, Riad Abou Zahr, Adrian Dyer, Gerald F Greil, Barbara Burkhardt, Animesh Tandon, Tarique Hussain
BACKGROUND: Volumetric black-blood cardiovascular magnetic resonance (CMR) has been hampered by long scan times and flow sensitivity. The purpose of this study was to assess the feasibility of black-blood, electrocardiogram (ECG)-triggered and respiratory-navigated 3D fast spin echo (3D FSE) for the visualization of the whole heart and great vessels. METHODS: The implemented 3D FSE technique used slice-selective excitation and non-selective refocusing pulses with variable flip angles to achieve constant echo signal for tissue with T1 (880 ms) and T2 (40 ms) similar to the vessel wall...
November 26, 2018: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/30456460/coronary-computed-tomography-angiography-ccta-in-patients-with-suspected-stable-coronary-artery-disease-cad-diagnostic-impact-and-clinical-consequences-in-the-german-cardiac-ct-registry-depending-on-stress-test-results
#5
Sebastian Barth, Mohamed Marwan, Jörg Hausleiter, Werner Moshage, Grigorios Korosoglou, Alexander Leber, Axel Schmermund, Helmut Gohlke, Oliver Bruder, Thorsten Dill, Stephen Schröder, Sebastian Kerber, Karsten Hamm, Frank Gietzen, Steffen Schneider, Jochen Senges, Stephan Achenbach
To evaluate diagnostic impact of clinical use of coronary computed tomography angiography (CCTA) in patients with suspected stable coronary artery disease (CAD) and its consequences in daily practice for patient management, depending on stress test results in daily practice. Between 2009 and 2014 of a total population of 1352 patients of the German Cardiac Computed Tomography (CT) Registry who had previously undergone stress tests, CCTA visualizations were carried out on the coronary arteries with suspected stable CAD...
November 19, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/30453697/an-eigenecg-network-approach-based-on-pcanet-for-personal-identification-from-ecg-signal
#6
Jae-Neung Lee, Yeong-Hyeon Byeon, Sung-Bum Pan, Keun-Chang Kwak
We herein propose an EigenECG Network (EECGNet) based on the principal component analysis network (PCANet) for the personal identification of electrocardiogram (ECG) from human biosignal data. The EECGNet consists of three stages. In the first stage, ECG signals are preprocessed by normalization and spike removal. The R peak points in the preprocessed ECG signals are detected. Subsequently, ECG signals are transformed into two-dimensional images to use as the input to the EECGNet. Further, we perform patch-mean removal and PCA algorithm similar to the PCANet from the transformed two-dimensional images...
November 18, 2018: Sensors
https://www.readbyqxmd.com/read/30440629/a-multichannel-eeg-acquisition-system-with-novel-ag-nws-pdms-flexible-dry-electrodes
#7
Zeyu Wang, Chen Chen, Wei Li, Wei Yuan, Tongmeng Han, Chenglu Sun, Linkai Tao, Yuting Zhao, Wei Chen
In this paper, a multichannel reconfigurable EEG acquisition system with novel flexible dry electrodes is proposed. The novel electrode is designed to overcome the limitations of conventional wet electrodes such as skin irritation, skin preparation, and conductive gel requirements. It is based on the conductive and stretchable Ag NWs/PDMS composite material and produced by 3D printing technology. Meanwhile, a portable reconfigurable 8-channel EEG acquisition system based on the analog front end ADS1299 is proposed to overcome the drawbacks of traditional EEG acquisition system such as, large in size, difficult to configure, and complicated to use...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/30429278/migraine-with-visual-aura-a-risk-factor-for-incident-atrial-fibrillation-a-cohort-study
#8
Souvik Sen, X Michelle Androulakis, Viktoriya Duda, Alvaro Alonso, Lin Yee Chen, Elsayed Z Soliman, Jared Magnani, Tushar Trivedi, Anwar T Merchant, Rebecca F Gottesman, Wayne D Rosamond
OBJECTIVE: Migraine with visual aura is associated with cardioembolic stroke risk. The aim of this study was to test association between migraine with visual aura and atrial fibrillation (AF), in the Atherosclerosis Risk in Communities study. METHODS: In the Atherosclerosis Risk in Communities study, a longitudinal, community-based cohort study, participants were interviewed for migraine history in 1993-1995 and were followed for incident AF through 2013. AF was adjudicated using ECGs, discharge codes, and death certificates...
November 14, 2018: Neurology
https://www.readbyqxmd.com/read/30411186/post-extrasystolic-characteristics-in-the-arterial-blood-pressure-waveform-are-associated-with-right-ventricular-dysfunction-in-intensive-care-patients
#9
Simon Tilma Vistisen, Benjamin Moody, Leo Anthony Celi, Christina Chen
Right ventricular dysfunction (RVD) is associated with end-organ dysfunction and mortality, but has been an overlooked condition in the ICU. We hypothesized that analysis of the arterial waveform in the presence of ventricular extrasystoles could differentiate patients with RVD from patients with a normally functioning right ventricle, because the 2nd and 3rd post-ectopic beat could reflect right ventricular state (pulmonary transit time) during the preceding ectopy. We retrospectively identified patients with echocardiographic evidence of moderate-to-severe RVD and patients with a normal functioning right ventricle (control) from the MIMIC database...
November 8, 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/30375449/postprandial-glycaemia-lowering-effect-of-a-green-tea-cultivar-sunrouge-and-cultivar-specific-metabolic-profiling-for-determining-bioactivity-related-ingredients
#10
Masafumi Wasai, Yoshinori Fujimura, Haruna Nonaka, Ryo Kitamura, Motoki Murata, Hirofumi Tachibana
Although the major green tea catechins can inhibit the activity of carbohydrate-hydrolyzing enzymes, there is a paucity of information describing the potential of other green tea ingredients and numerous green tea cultivars. Herein, we reveled that a green tea cultivar Sunrouge significantly suppressed the postprandial blood glucose level in mice. Unlike the most representative Japanese green tea cultivar, Yabukita, the suppression by Sunrouge was observed clearly during the initial period after oral dosing of starch...
October 30, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30371397/a-machine-learning-approach-for-detection-and-quantification-of-qrs-fragmentation
#11
Griet Goovaerts, Sibasankar Padhy, Bert Vandenberk, Carolina Varon, Rik Willems, Sabine Van Huffel
OBJECTIVE: Fragmented QRS (fQRS) is an accessible biomarker and indication of myocardial scarring that can be detected from the electrocardiogram (ECG). Nowadays, fQRS scoring is done on a visual basis, which is time-consuming and leads to subjective results. This study proposes an automated method to detect and quantify fQRS in a continuous way using features extracted from Variational Mode Decomposition (VMD) and Phase-Rectified Signal Averaging (PRSA). METHODS: In the proposed framework, QRS complexes in the ECG signals were first segmented using VMD...
October 29, 2018: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/30364006/prevalence-and-temporal-distribution-of-extrasystoles-in-septic-icu-patients-the-feasibility-of-predicting-fluid-responsiveness-using-extrasystoles
#12
Johannes Enevoldsen, Cristhian Potes, Minnan Xu-Wilson, Simon T Vistisen
Background: Extrasystoles may be useful for predicting the response to fluid therapy in hemodynamically unstable patients but their prevalence is unknown. The aim of this study was to estimate the availability of extrasystoles in intensive care unit patients diagnosed with sepsis. The study aim was not to validate the fluid responsiveness prediction ability of extrasystoles. Methods: Twenty-four-hour ECG recordings from a convenience sample of 50 patients diagnosed with sepsis were extracted from the MIMIC-II waveform database, and ECGs were visually examined for correct QRS complex detection...
2018: Critical Care Research and Practice
https://www.readbyqxmd.com/read/30341669/left-atrial-longitudinal-strain-in-dilated-cardiomyopathy-patients-is-there-a-discrimination-threshold-for-atrial-fibrillation
#13
Jacek Kurzawski, Agnieszka Janion-Sadowska, Andrzej Gackowski, Marianna Janion, Łukasz Zandecki, Magdalena Chrapek, Marcin Sadowski
To determine the left atrial longitudinal strain discrimination threshold of atrial fibrillation (AF) in patients with dilated cardiomyopathy (DCM). A total of 100 DCM patients and LVEF < 25% were included. Of them, 50 had sinus rhythm (SR), and 50 had AF. Patients with significant valvular disease, cardiac pacemakers and prosthetic valves were excluded. Speckle tracking echocardiography was performed to visualize the inferior and lateral walls of the left atrium as well as the interatrial septum. The Q-Analysis software was used to assess left atrial contractile strain (εCT ) during the atrial systole and left atrial conduit strain (εCD ) during the atrial filling...
October 19, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/30322147/high-resolution-seismocardiogram-acquisition-and-analysis-system
#14
Fábio Leitão, Eurico Moreira, Filipe Alves, Mário Lourenço, Olga Azevedo, João Gaspar, Luis A Rocha
Several devices and measurement approaches have recently been developed to perform ballistocardiogram (BCG) and seismocardiogram (SCG) measurements. The development of a wireless acquisition system (hardware and software), incorporating a novel high-resolution micro-electro-mechanical system (MEMS) accelerometer for SCG and BCG signals acquisition and data treatment is presented in this paper. A small accelerometer, with a sensitivity of up to 0.164 µs/µg and a noise density below 6.5 µg/ Hz is presented and used in a wireless acquisition system for BCG and SCG measurement applications...
October 13, 2018: Sensors
https://www.readbyqxmd.com/read/30310021/-imaging-diagnosis-and-interventional-radiology-for-thoracic-surgery
#15
Kei Takase
Recent introduction of multidetector-row computed tomography(MDCT) with more than 64 scanners enabled high-speed scanning in wide range of the body. Electrocardiogram (ECG) gated scanning and 4-dimensional imaging provides precise evaluation of cardiac and vascular diseases. Fine vascular structures such as the artery of Adamkiewicz can be visualized due to improved spatial and temporal resolution of CT and magnetic resonance imaging(MRI). Interventional radiology also plays important roles in combination with surgical treatment...
September 2018: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/30300868/detection-of-patients-with-methamphetamine-dependence-with-cue-elicited-heart-rate-variability-in-a-virtual-social-environment
#16
Yong-Guang Wang, Zhi-Hua Shen, Xuan-Chen Wu
In the present study, we developed a methamphetamine (METH)-related virtual social environment to elicit subjective craving and physiological reactivity. Sixty-one male patients who were abstinent from METH use and 45 age-matched healthy males (i.e., normal controls) were recruited. The physiological electrocardiogram (ECG) signals were recorded before (resting-state condition) and during viewing of a METH-cue video in the virtual environment (cue-induced condition). The cue-induced subjective craving was measured with a visual analogue scale (VAS) for patients with METH dependence...
October 2, 2018: Psychiatry Research
https://www.readbyqxmd.com/read/30269287/coronary-thrombosis-in-acute-pancreatitis
#17
Saagar Sanghvi, Fahad Waqar, Mohamed Effat
The incidence of acute myocardial infarction in the setting of acute pancreatitis is very rare. The recognition of such complex diagnosis may be clinically challenging, as the symptoms of both conditions are often indistinguishable. We report a case in which we encountered both conditions concurrently, and hypothesize that the ambient inflammatory and pro-thrombotic milieu of acute pancreatitis resulted in acute coronary thrombosis despite the absence of significant coronary atherosclerosis. Among multiple coronary imaging modalities currently in use, optimal cohesion tomography provided a unique capability for direct visualization of the coronary thrombus...
September 29, 2018: Journal of Thrombosis and Thrombolysis
https://www.readbyqxmd.com/read/30220907/non-image-forming-effects-of-light-on-brainwaves-autonomic-nervous-activity-fatigue-and-performance
#18
Taleb Askaripoor, Majid Motamedzadeh, Rostam Golmohammadi, Maryam Farhadian, Mohammad Babamiri, Mehdi Samavati
Fatigue and sleepiness are one of the main causes of human errors and accidents in the workplace. The empirical evidence has approved that, in addition to stimulating the visual system, light elicits brain responses, which affect physiological and neurobehavioral human functions, known as the non-image forming (NIF) effects of light. As recent evidences have shown the positive effects of red or low correlated color temperature white light on alertness and performance, we investigated whether exposure to 2564 K light could improve subjective and objective measures of alertness and performance compared with 7343 K, 3730 K, and dim light (DL) conditions during the daytime...
September 12, 2018: Journal of Circadian Rhythms
https://www.readbyqxmd.com/read/30188809/a-wearable-multi-modal-bio-sensing-system-towards-real-world-applications
#19
Siddharth Siddharth, Aashish Patel, Tzyy-Ping Jung, Terry Sejnowski
Multi-modal bio-sensing has recently been used as effective research tools in affective computing, autism, clinical disorders, and virtual reality among other areas. However, none of the existing bio-sensing systems support multi-modality in a wearable manner outside well-controlled laboratory environments with research-grade measurements. This work attempts to bridge this gap by developing a wearable multi-modal bio-sensing system capable of collecting, synchronizing, recording and transmitting data from multiple bio-sensors: PPG, EEG, eye-gaze headset, body motion capture, GSR, etc...
September 4, 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/30181665/ecg-non-gated-multi-detector-computed-tomography-protocol-prior-to-catheter-ablation-of-atrial-fibrillation-provides-sufficient-data-quality-with-lower-radiation-exposure-compared-to-ecg-gated-protocol-results-of-a-prospective-randomized-and-blinded-study
#20
Zbynek Tudos, Tomas Skala, Martin Homola, Ondrej Moravec, Milos Taborsky, Martin Kocher, Marie Cerna, Filip Ctvrtlik, Frantisek Odstrcil, Katerina Langova, Olga Klementova
BACKGROUND: The role of ECG-gating in left atrium (LA) computed tomography (MDCT) imaging is not precisely defined. METHODS AND RESULTS: 62 patients were randomized according to ECG gating with prospective evaluation of image quality, Volume CT Dose Index, Dose Length Product, Effective Dose and registration error between anatomical map and MDCT. We found significant difference in all radiation variables, but not in visual quality, registration error, CA duration, CA fluoroscopy time and CA fluoroscopy dose...
August 28, 2018: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
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