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https://read.qxmd.com/read/30835856/automatic-analysis-of-pre-ejection-period-during-sleep-using-impedance-cardiogram
#1
Mohamad Forouzanfar, Fiona C Baker, Ian M Colrain, Aimée Goldstone, Massimiliano de Zambotti
The pre-ejection period (PEP) is a valid index of myocardial contractility and beta-adrenergic sympathetic control of the heart defined as the time between electrical systole (ECG Q wave) to the initial opening of the aortic valve, estimated as the B point on the impedance cardiogram (ICG). B-point detection accuracy can be severely impacted if ICG cardiac cycles corrupted by motion artifact, noise, or electrode displacement are included in the analyses. Here, we developed new algorithms to detect and exclude corrupted ICG cycles by analyzing their level of activity...
March 5, 2019: Psychophysiology
https://read.qxmd.com/read/30704282/submillisievert-multiphasic-coronary-computed-tomography-angiography-for-pediatric-patients-with-congenital-heart-diseases
#2
Julien Le Roy, Hélène Vernhet Kovacsik, Hamid Zarqane, Marie Vincenti, Hamouda Abassi, Kathleen Lavastre, Thibault Mura, Alain Lacampagne, Pascal Amedro
BACKGROUND: The use of coronary computed tomography (CT) angiography in children with coronary artery anomalies is increasing. However, it remains technically demanding and the need to adapt acquisition parameters to a patient's cardiac characteristics has not yet been addressed. The aim of the study was to prospectively assess the feasibility of personalized multiphasic coronary CT angiography for pediatric patients. METHODS: Fifty pediatric patients (mean age 6...
February 2019: Circulation. Cardiovascular Imaging
https://read.qxmd.com/read/30695882/-clinical-analysis-of-right-atrial-appendage-aneurysms-complicated-by-atrial-tachyarrhythmias-in-three-children
#3
Y Zhang, X M Li, H Jiang, F Q Zhang, Y Q Jin, H J Liu, H Y Ge
Objective: To investigate the clinical features and results of treatment for right atrial appendage aneurysms complicated by atrial tachyarrhythmias in children. Methods: This retrospective study included three children with right atrial appendage aneurysm complicated by atrial tachyarrhythmias (aged 1.0 to 5.3 years, weight 10 to 17.1 kg) who were hospitalized at the Pediatric Cardiology Department (Heart Center) of the First Hospital of Tsinghua University (Beijing Huaxin Hospital) during the period from January 2016 through April 2018...
February 2, 2019: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://read.qxmd.com/read/30656460/image-quality-and-radiation-dose-of-two-prospective-ecg-triggered-protocols-using-128-slice-dual-source-ct-angiography-in-infants-with-congenital-heart-disease
#4
Baojin Chen, Shuo Zhao, Yang Gao, Zhaoping Cheng, Yanhua Duan, Pritam Das, Ximing Wang
This study aims to investigate the image quality and radiation dose of prospective ECG-triggered 128-slice dual-source CT (DSCT) angiography in the delineation of coronary arteries in infants with congenital heart disease (CHD). Sixty-three infants with CHD were randomly assigned into two groups: prospective ECG-triggered sequential protocol (group 1) and high-pitch spiral protocol (group 2). Patients were selected to the protocols randomly. A five-point scoring system was applied to study the capability of detecting coronary arteries...
January 17, 2019: International Journal of Cardiovascular Imaging
https://read.qxmd.com/read/30651216/direct-comparison-of-optical-coherence-tomography-and-high-definition-60-mhz-intravascular-ultrasound-imaging-of-intra-procedural-stent-thrombosis-in-a-patient-with-acute-coronary-syndrome
#5
Ryo Ataka, Naritatsu Saito, Akira Tsujimura, Eri Toda Kato, Takeshi Kimura
An 80-year-old man with ST-segment elevation myocardial infraction underwent coronary stenting using an everolimus-eluting stent, which resulted in a good coronary flow with no residual stenosis. However, 10 min after final coronary angiography, the patient complained of chest discomfort and the ECG again showed ST elevation. Repeat coronary angiography revealed multiple contrast filling defects in the stent. High-definition 60-MHz intravascular ultrasound (IVUS) examination showed multiple low echoic structures inside the stent, though its visualization was not clear...
December 7, 2018: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://read.qxmd.com/read/30603221/simultaneous-monitoring-of-motion-ecg-of-two-subjects-using-bluetooth-piconet-and-baseline-drift
#6
Tejal Dave, Utpal Pandya
Uninterrupted monitoring of multiple subjects is required for mass causality events, in hospital environment or for sports by medical technicians or physicians. Movement of subjects under monitoring requires such system to be wireless, sometimes demands multiple transmitters and a receiver as a base station and monitored parameter must not be corrupted by any noise before further diagnosis. A Bluetooth Piconet network is visualized, where each subject carries a Bluetooth transmitter module that acquires vital sign continuously and relays to Bluetooth enabled device where, further signal processing is done...
November 2018: Biomedical Engineering Letters
https://read.qxmd.com/read/30594641/hybrid-thoracoscopic-epicardial-ablation-of-right-ventricular-outflow-tract-in-patients-with-brugada-syndrome
#7
Francesca Salghetti, Carlo de Asmundis, Juan Sieira, Hugo Enrique Coutiño, Juan Pablo Abugattas, Varnavas Varnavas, Riccardo Maj, Muryo Terasawa, Thiago Guimarães Osório, Erwin Stroker, Lucio Capulzini, Saverio Iacopino, Gaetano Paparella, Vincent Umbrain, Jan Poelaert, Sonia Van Dooren, Pedro Brugada, Gian Battista Chierchia, Mark La Meir
BACKGROUND: Abnormal delayed electrograms (EGM) from the anterior wall of the right ventricular outflow tract (RVOT) epicardium has become the ablation target in Brugada Syndrome (BrS). OBJETIVE: The study's aim was to analyse the safety, feasibility and efficacy of a novel hybrid thoracoscopic approach to perform epicardial RVOT radio-frequency (RF) ablation in BrS. METHODS: Thirty-six patients affected by BrS (26 males; mean age 36.6±15...
December 27, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://read.qxmd.com/read/30523836/fetal-ecg-extraction-from-time-varying-and-low-rank-noninvasive-maternal-abdominal-recordings
#8
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://read.qxmd.com/read/30503652/severe-sinus-bradycardia-in-puumala-virus-infection
#9
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 with flu-like syndrome and visual disturbance. Laboratory results can show thrombocytopenia. The oliguric phase with elevated serum creatinine level then occurs. 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://read.qxmd.com/read/30497755/electrocardiomatrix-facilitates-qualitative-identification-of-diminished-heart-rate-variability-in-critically-ill-patients-shortly-before-cardiac-arrest
#10
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://read.qxmd.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
#11
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://read.qxmd.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
#12
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://read.qxmd.com/read/30453697/an-eigenecg-network-approach-based-on-pcanet-for-personal-identification-from-ecg-signal
#13
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://read.qxmd.com/read/30440629/a-multichannel-eeg-acquisition-system-with-novel-ag-nws-pdms-flexible-dry-electrodes
#14
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://read.qxmd.com/read/30429278/migraine-with-visual-aura-is-a-risk-factor-for-incident-atrial-fibrillation-a-cohort-study
#15
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...
December 11, 2018: Neurology
https://read.qxmd.com/read/30411186/post-extrasystolic-characteristics-in-the-arterial-blood-pressure-waveform-are-associated-with-right-ventricular-dysfunction-in-intensive-care-patients
#16
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://read.qxmd.com/read/30375449/postprandial-glycaemia-lowering-effect-of-a-green-tea-cultivar-sunrouge-and-cultivar-specific-metabolic-profiling-for-determining-bioactivity-related-ingredients
#17
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://read.qxmd.com/read/30371397/a-machine-learning-approach-for-detection-and-quantification-of-qrs-fragmentation
#18
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://read.qxmd.com/read/30364006/prevalence-and-temporal-distribution-of-extrasystoles-in-septic-icu-patients-the-feasibility-of-predicting-fluid-responsiveness-using-extrasystoles
#19
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://read.qxmd.com/read/30341669/left-atrial-longitudinal-strain-in-dilated-cardiomyopathy-patients-is-there-a-discrimination-threshold-for-atrial-fibrillation
#20
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
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