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https://www.readbyqxmd.com/read/28325016/sleep-stage-classification-by-non-contact-vital-signs-indices-using-doppler-radar-sensors
#1
Masayuki Kagawa, Kazuki Suzumura, Takemi Matsui
Disturbed sleep has become more common in recent years. To improve the quality of sleep, undergoing sleep observation has gained interest as a means to resolve possible problems. In this paper, we evaluate a non-restrictive and non-contact method for classifying real-time sleep stages and report on its potential applications. The proposed system measures heart rate (HR), heart rate variability (HRV), body movements, and respiratory signals of a sleeping person using two 24-GHz microwave radars placed beneath the mattress...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28317163/the-value-of-diastolic-flow-reversal-in-the-descending-thoracic-aorta-as-a-determinant-of-invasively-measured-aortic-pulse-pressure
#2
Hack-Lyoung Kim, Yu Nui Kim, Hee-Jun Kim, Woo-Hyun Lim, Jae-Bin Seo, Sang-Hyun Kim, Myung-A Kim, Joo-Hee Zo
AIM: Although the diastolic flow reversal of the descending aorta has been recognized in patients with aortic regurgitation, its generation without this condition is still unknown. This study was performed to investigate whether flow patterns of the descending thoracic aorta, as measured by echocardiography, can represent invasively measured aortic pulse pressure (APP). METHODS: A total of 100 patients (age, 62.3±11.0 years; men, 62.0%) undergoing invasive coronary angiography (ICA) was analyzed...
March 19, 2017: Echocardiography
https://www.readbyqxmd.com/read/28303441/association-between-health-literacy-and-hypertension-management-in-a-chinese-community-a-retrospective-cohort-study
#3
Di Shi, Jiangbo Li, Yong Wang, Si Wang, Kai Liu, Rufeng Shi, Qiang Zhang, Xiaoping Chen
Low health literacy is associated with poor clinical outcomes. The relationship between literacy and blood pressure (BP) has been inconsistent. We investigated the determinants of health literacy and the potential relationship between health literacy and hypertension management. We conducted a retrospective cohort trial of 360 hypertensive patients. Scale measurements, physical examination, and laboratory tests were performed based on a standard protocol. To determine factors associated with health literacy, multiple logistic regression analysis was performed and the discriminatory power of the scale score for hypertension control was assessed by the area under the receiver operating curve...
March 16, 2017: Internal and Emergency Medicine
https://www.readbyqxmd.com/read/28299609/ascending-aortic-distensibility-and-target-organ-damage-in-primary-hypertension-without-diabetes
#4
Chong-Fu Jia, Zhao-Qian Wang, Xi-Xia Sun, Zhi-Qiang Yang, Yu-Jie Zou, Yi-Nong Jiang
To investigate the relationship between ascending aortic distensibility (AAD) and hypertensive target organ damage (TOD) and its potential value in prediction. One hundred and sixty seven primary hypertension inpatients who underwent coronary CTA examination were enrolled into our study. Retrospective ECG-triggering scanning mode were applied and the images were reconstructed every 5% phase in the entire R-R interval. Maximum and minimum ascending aortic areas as well as the AAD value were calculated on the interested slice...
March 16, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28295936/correlating-the-relationship-between-interarm-systolic-blood-pressure-and-cardiovascular-disease-risk-factors
#5
Wei Ma, Baowei Zhang, Ying Yang, Litong Qi, Lei Meng, Yan Zhang, Yong Huo
Interarm systolic blood pressure difference (IASBPD) can predict cardiovascular disease. To investigate the relationship between IASBPD and cardiovascular disease risk factors, a total of 1426 individuals were studied. Blood pressure was assessed simultaneously and IASBPD was expressed as the absolute difference value (|R-L|). Cardiovascular disease risk factors were compared between the high IASBPD group (IASBPD ≥10 mm Hg) and the normal IASBPD group (IASBPD <10 mm Hg). An increased prevalence of hypertension, body mass index, and systolic and diastolic blood pressure were observed in the high IASBPD group (P<...
March 14, 2017: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/28294860/-coronary-flow-reserve-in-the-left-anterior-and-posterior-descending-arteries-as-an-additional-option-to-dipyridamole-stress-echocardiography-for-detection-of-stenosis
#6
A A Boshchenko, A V Vrublevsky, R S Karpov
AIM: to assess additive diagnostic value of simultaneous evaluation of coronary flow reserve (CFR) in the left anterior descending (LAD) artery and posterior descending artery (PDA) during dipyridamole stress echocardiography (stress-Echo) for detection of LAD and PDA stenoses >50%. METHODS: 108 in-patients (mean age 50+/-11 years) with cardiac chest pain underwent dipyridamole stress-Echo with ECG-analysis, wall motion analysis by 2-dimentional imaging (2D) and coronary flow reserve (CFR) evaluation in both LAD and PDA by pulse-wave Doppler...
April 2016: Kardiologiia
https://www.readbyqxmd.com/read/28291958/pulse-pressure-instead-of-brachium-ankle-pulse-wave-velocity-is-associated-with-reduced-kidney-function-in-a-chinese-han-population
#7
Linpei Jia, Weiguang Zhang, Jie Ma, Xizhao Chen, Lei Chen, Zuoxiang Li, Guangyan Cai, Jing Huang, Jinping Zhang, Xiaojuan Bai, Zhe Feng, Xuefeng Sun, Xiangmei Chen
BACKGROUND/AIMS: In this study, we aim to investigate the association between renal function and arterial stiffness in a Chinese Han population, and further to discuss the effects of smoking on renal function. METHODS: We collected the data of the brachium-ankle pulse wave velocity (baPWV), blood pressure, blood chemistry and smoking status. Then, the multiple linear regression was done to explore the relationship between estimated glomerular filtration (eGFR) and baPWV...
March 13, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/28289784/high-blood-pressure-states-in-children-adolescents-and-young-adults-associate-accelerated-vascular-aging-with-a-higher-impact-in-females-arterial-properties
#8
S Curcio, V García-Espinosa, J M Castro, G Peluso, M Marotta, M Arana, P Chiesa, G Giachetto, D Bia, Yanina Zócalo
The aims of the study were to determine (1) whether the presence of High blood pressure (HBP) states in the youth associate a steeper rate of age-related change in arterial geometrical and wall properties with respect to subjects with no previous cardiovascular risk factor (CRF) exposure, (2) in which parameters and in what magnitude, and (3) the existence of a gender-related difference in the impact of this condition on arterial properties. 300 individuals (mean/range: 15/4-29 years; 133 females) were included...
March 13, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28285896/perinatal-changes-in-fetal-ventricular-geometry-myocardial-performance-and-cardiac-function-in-normal-term-pregnancies
#9
Olga Patey, Michael A Gatzoulis, Basky Thilaganathan, Julene S Carvalho
BACKGROUND: The fetal heart at term is exposed to an increase in hemodynamic work as a consequence of fetal growth, increased circulating volume, and alteration in loading patterns due to maturational changes in fetoplacental circulation. The extent to which these cardiovascular changes influence human fetal and neonatal cardiac adaptation has not been fully elucidated. The aim of this study was to evaluate perinatal cardiovascular changes in ventricular geometry and myocardial performance in normal term fetuses...
March 9, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28285656/relationships-of-insulin-like-growth-factor-1-its-binding-proteins-and-cardiometabolic-risk-in-hypertensive-perimenopausal-women
#10
Agnieszka Olszanecka, Aneta Dragan, Kalina Kawecka-Jaszcz, Danuta Fedak, Danuta Czarnecka
PURPOSE: During the transition from premenopause to postmenopause, many women experience weight gain and central fat deposition; therefore, we hypothesized that circulating growth factors can play a role in the pathogenesis of hypertension, metabolic syndrome, and subclinical organ damage in perimenopausal women. BASIC PROCEDURES: The study included 192 women aged 40 to 60years; 152 had newly diagnosed essential hypertension that had never been treated, and 40 were normotensive age-matched controls...
April 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28284918/intracortical-microstimulation-differentially-activates-cortical-layers-based-on-stimulation-depth
#11
Mathias Benjamin Voigt, Peter Hubka, Andrej Kral
BACKGROUND: Intracortical microstimulation is one of the most common techniques to causally interfere with neuronal processing, but neuronal recordings spanning the whole cortical depth during stimulation are exceptionally rare. OBJECTIVE/HYPOTHESIS: Here we combined layer-specific intracortical microstimulation with extracellular recordings on the same shank of a linear multi-electrode array to study the effects of electrical stimulation in different cortical depths on intracortical processing in the auditory cortex in vivo...
February 27, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28278360/assessment-of-arterial-stiffness-in-periodontitis-using-a-novel-pulse-wave-imaging-methodology
#12
Elena C Sanz-Miralles, Ronny Li, Fatemeh Momen-Heravi, Carlos Mendieta, Elisa E Konofagou, Panos N Papapanou
AIM: We investigated the cross-sectional relationship between periodontal status and arterial stiffness, assessed through a novel Pulse Wave Imaging methodology. METHODS: Eighty volunteers were enrolled (39% male, age range 24-78 years) and 33 pairs were formed of periodontitis patients/periodontally healthy controls, matched by age and gender. A full-mouth periodontal examination was performed and the degree of stiffness of the right and left carotid arteries was assessed by measuring pulse wave velocity (PWV) and the uniformity in pulse wave propagation (R(2) )...
March 9, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28275877/cardiovascular-autonomic-dysfunction-and-carotid-stiffness-in-adults-with-repaired-tetralogy-of-fallot
#13
Marko Novaković, Katja Prokšelj, Vito Starc, Borut Jug
PURPOSE: Adults after surgical repair of tetralogy of Fallot (ToF) may have impaired vascular and cardiac autonomic function. Thus, we wanted to assess interrelations between heart rate variability (HRV) and heart rate recovery (HRR), as parameters of cardiac autonomic function, and arterial stiffness, as a parameter of vascular function, in adults with repaired ToF as compared to healthy controls. METHODS: In a case-control study of adults with repaired ToF and healthy age-matched controls we measured: 5-min HRV variability (with time and frequency domain data collected), carotid artery stiffness (through pulse-wave analysis using echo-tracking ultrasound) and post-exercise HRR (cycle ergometer exercise testing)...
March 8, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28273568/blast-wave-dynamics-the-influence-of-the-shape-of-the-explosive
#14
J Artero-Guerrero, J Pernas-Sánchez, F Teixeira-Dias
A numerical model is developed to analyse the influence of the shape of a high-explosive on the dynamics of the generated pressure wave. A Multi-Material Arbitrary Lagrangian Eulerian (MM-ALE) technique is used as the CONWEP approach is not adequate to model such situations. Validation and verification of the proposed numerical model is achieved based on experimental data obtained from the bibliography. The numerical model provides relevant information that cannot be obtained from the experimental results. The influence of the mass and shape of the high-explosive is studied and correlated to the dynamics of the generated blast wave through the analysis of peak pressures, time of arrival and impulse...
February 24, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28273173/relationships-between-lifestyle-patterns-and-cardio-renal-metabolic-parameters-in-patients-with-type-2-diabetes-mellitus-a-cross-sectional-study
#15
Takeshi Ogihara, Tomoya Mita, Yusuke Osonoi, Takeshi Osonoi, Miyoko Saito, Atsuko Tamasawa, Shiho Nakayama, Yuki Someya, Hidenori Ishida, Masahiko Gosho, Akio Kanazawa, Hirotaka Watada
INTRODUCTION: While individuals tend to show accumulation of certain lifestyle patterns, the effect of such patterns in real daily life on cardio-renal-metabolic parameters remains largely unknown. This study aimed to assess clustering of lifestyle patterns and investigate the relationships between such patterns and cardio-renal-metabolic parameters. PARTICIPANTS AND METHODS: The study participants were 726 Japanese type 2 diabetes mellitus (T2DM) outpatients free of history of cardiovascular diseases...
2017: PloS One
https://www.readbyqxmd.com/read/28270998/ultra-fast-line-field-low-coherence-holographic-elastography-using-spatial-phase-shifting
#16
Chih-Hao Liu, Alexander Schill, Raksha Raghunathan, Chen Wu, Manmohan Singh, Zhaolong Han, Achuth Nair, Kirill V Larin
Optical coherence elastography (OCE) is an emerging technique for quantifying tissue biomechanical properties. Generally, OCE relies on point-by-point scanning. However, long acquisition times make point-by-point scanning unfeasible for clinical use. Here we demonstrate a noncontact single shot line-field low coherence holography system utilizing an automatic Hilbert transform analysis based on a spatial phase shifting technique. Spatio-temporal maps of elastic wave propagation were acquired with only one air-pulse excitation and used to quantify wave velocity and sample mechanical properties at a line rate of 200 kHz...
February 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28270889/relationships-among-conventional-cardiovascular-risk-factors-and-lifestyle-habits-with-arterial-stiffness-in-type-2-diabetic-patients
#17
Misako Hamamura, Tomoya Mita, Yusuke Osonoi, Takeshi Osonoi, Miyoko Saito, Atsuko Tamasawa, Shiho Nakayama, Yuki Someya, Hidenori Ishida, Masahiko Gosho, Akio Kanazawa, Hirotaka Watada
BACKGROUND: While conventional cardiovascular risk factors and certain lifestyle habits are associated with arterial stiffness in patients with type 2 diabetes mellitus (T2DM), it is still unknown whether they are actually associated with arterial stiffness even after adjustment for conventional cardiovascular risk factors and lifestyle habits. The aim of this study was to identify variables that are associated with brachial-ankle pulse wave velocity (baPWV). METHODS: The study participants comprised 724 Japanese T2DM outpatients free of history of cardiovascular diseases...
April 2017: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/28269349/an-inductive-narrow-pulse-rfid-telemetry-system-for-gastric-slow-waves-monitoring
#18
Amir Javan-Khoskholgh, Zaid Abukhalaf, Ji Li, Larry S Miller, Mehdi Kiani, Aydin Farajidavar
We present a passive data telemetry system for real-time monitoring of gastric electrical activity of a living subject. The system is composed of three subsystems: an implantable unit (IU), a wearable unit (WU), and a stationary unit (SU). Data communication between the IU and WU is based on a radio-frequency identification (RFID) link operating at 13.56 MHz. Since wireless power transmission and reverse data telemetry system share the same inductive interface, a load shift keying (LSK)-based differential pulse position (DPP) coding data communication with only 6...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269220/using-multiple-placements-of-accelerometers-to-measure-cardiovascular-pulse-transit-times
#19
Natalie Kurgan Canino, Ruisheng Wang, Charles J Robinson
To measure pulse transit times (PTT) and calculate pulse wave velocities (PWV), tri-axial and uniaxial accelerometers were placed in groups of 2 to 4 over the manubrium, xiphoid process, forehead, wrist and ankle, and/or over the carotid, femoral, and posterior auricular arteries in 11 consented supine subjects. Signals were sampled at 1 kHz and filtered. Radial vectors were calculated from the tri-axial measurements. A 3-lead ECG was simultaneously collected over the same 180 s window, as well as respiratory rate...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267040/aortic-arch-mechanics-measured-with-two-dimensional-speckle-tracking-echocardiography
#20
Rogério Teixeira, Ricardo Monteiro, Rui Baptista, Telmo Pereira, Miguel A Ribeiro, Alexandra Gonçalves, Nuno Cardim, Lino Gonçalves
PURPOSE: To study the feasibility of vascular mechanics at the aortic arch with two-dimensional speckle tracking echocardiography, as well as to define normal values and to compare results between hypertensive patients and healthy patients. METHODS: We included 107 patients (61 healthy patients and 46 hypertensive patients) who underwent a complete echocardiographic exam, including a short-axis view of the aortic arch. The speckle tracking methodology was used to calculate aortic arch mechanics offline (EchoPAC; GE Healthcare)...
March 6, 2017: Journal of Hypertension
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