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https://www.readbyqxmd.com/read/28227577/blood-perfusion-display-based-on-video-pulse-wave
#1
Makoto Yoshizawa, Norihiro Sugita, Makoto Abe, Akira Tanaka, Kazuma Obara, Tsuyoshi Yamauchi, Noriyasu Homma, Tomoyuki Yambe, Makoto Yoshizawa, Norihiro Sugita, Makoto Abe, Akira Tanaka, Kazuma Obara, Tsuyoshi Yamauchi, Noriyasu Homma, Tomoyuki Yambe, Norihiro Sugita, Noriyasu Homma, Makoto Abe, Kazuma Obara, Tomoyuki Yambe, Makoto Yoshizawa, Akira Tanaka, Tsuyoshi Yamauchi
In this study, an easy system for monitoring dynamic blood perfusion patterns and the pulse wave velocity (PWV) has been developed by processing video images of a human body to assess blood circulation for daily management of physical conditions or for detecting persons in poor physical condition in public places. The experiment suggested that this tool can be used to easily evaluate the PWV; however, the obtained value from the video image of the face was about 1/10 of the standard value calculated from thick vessels...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227452/single-source-photoplethysmograph-transducer-for-local-pulse-wave-velocity-measurement
#2
P M Nabeel, Jayaraj Joseph, Vartika Awasthi, Mohanasankar Sivaprakasam, P M Nabeel, Jayaraj Joseph, Vartika Awasthi, Mohanasankar Sivaprakasam, P M Nabeel, Mohanasankar Sivaprakasam, Vartika Awasthi, Jayaraj Joseph
Cuffless evaluation of arterial blood pressure (BP) using pulse wave velocity (PWV) has received attraction over the years. Local PWV based techniques for cuffless BP measurement has more potential in accurate estimation of BP parameters. In this work, we present the design and experimental validation of a novel single-source Photoplethysmograph (PPG) transducer for arterial blood pulse detection and cycle-to-cycle local PWV measurement. The ability of the transducer to continuously measure local PWV was verified using arterial flow phantom as well as by conducting an in-vivo study on 17 volunteers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227450/using-multiple-placements-of-accelerometers-to-measure-cardiovascular-pulse-transit-times
#3
Natalie Kurgan Canino, Ruisheng Rick Wang, Charles J Robinson, Natalie Kurgan Canino, Ruisheng Wang, Charles J Robinson, Natalie Kurgan Canino, Charles J Robinson, Ruisheng Rick Wang
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/28227243/assessment-of-pre-ejection-period-in-ambulatory-subjects-using-seismocardiogram-in-a-wearable-blood-pressure-monitor
#4
Guanqun Zhang, Amber C Cottrell, Isaac C Henry, Devin B McCombie, Guanqun Zhang, Amber C Cottrell, Isaac C Henry, Devin B McCombie, Isaac C Henry, Devin B McCombie, Amber C Cottrell, Guanqun Zhang
The ability to monitor arterial blood pressure continuously with unobtrusive body worn sensors may provide a unique and potentially valuable assessment of a patient's cardiovascular health. Pulse wave velocity (PWV) offers an attractive method to continuously monitoring blood pressure. However, PWV technologies based on timing measurements between the ECG and a distal PPG suffer from inaccuracies on mobile patients due to the confounding influence of pre-ejection period (PEP). In this paper, we presented a wearable, continuous blood pressure monitor (ViSi Mobile) that can measure and track changes in PEP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226892/a-bifrequent-passive-sensor-system-for-measurement-of-the-pulse-wave-velocity-in-a-stent
#5
Jonathan Schachtele, Jonathan Schachtele, Jonathan Schachtele
In-stent restenosis (ISR) is a frequent complication after stent implantation. Recently, a passive sensor system for integration into a stent has been presented, which is designed to detect an ISR early by measuring the local pulse wave velocity (PWV). This system is based on two pressure sensitive transponders, the resonance frequency of which hits the frequency of a magnetic field generated by an externally applied transceiver coil during a pulse cycle. This method is limited in applicability by the largest PWV it can measure...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222756/proximal-aortic-stiffening-in-turner-patients-may-be-present-before-dilation-can-be-detected-a-segmental-functional-mri-study
#6
Daniel G H Devos, Katya De Groote, Danilo Babin, Laurent Demulier, Yves Taeymans, Jos J Westenberg, Luc Van Bortel, Patrick Segers, Eric Achten, Jean De Schepper, Ernst Rietzschel
BACKGROUND: To study segmental structural and functional aortic properties in Turner syndrome (TS) patients. Aortic abnormalities contribute to increased morbidity and mortality of women with Turner syndrome. Cardiovascular magnetic resonance (CMR) allows segmental study of aortic elastic properties. METHOD: We performed Pulse Wave Velocity (PWV) and distensibility measurements using CMR of the thoracic and abdominal aorta in 55 TS-patients, aged 13-59y, and in a control population (n = 38;12-58y)...
February 13, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28219916/comparison-of-carotid-femoral-and-brachial-ankle-pulse-wave-velocity-in-association-with-target-organ-damage-in-the-community-dwelling-elderly-chinese-the-northern-shanghai-study
#7
Yuyan Lu, Mengyun Zhu, Bin Bai, Chen Chi, Shikai Yu, Jiadela Teliewubai, Henry Xu, Kai Wang, Jing Xiong, Yiwu Zhou, Hongwei Ji, Ximin Fan, Xuejing Yu, Jue Li, Jacques Blacher, Yi Zhang, Yawei Xu
BACKGROUND: Carotid-femoral pulse-wave velocity (cf-PWV) and brachial-ankle PWV (ba-PWV) are the 2 most frequently applied PWV measurements. However, little is known about the comparison of hypertensive target organ damage (TOD) with cf-PWV and ba-PWV. METHODS AND RESULTS: A total of 1599 community-dwelling elderly subjects (age >65 years) in northern Shanghai were recruited from June 2014 to August 2015. Both cf-PWV and ba-PWV were measured using SphygmoCor and VP1000 systems, respectively...
February 20, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28211216/low-dose-eplerenone-treatment-decreases-aortic-stiffness-in-patients-with-resistant-hypertension
#8
Tatjana Kalizki, Bernhard M W Schmidt, Ulrike Raff, Annemarie Reinold, Thomas K Schwarz, Markus P Schneider, Roland E Schmieder, Andreas Schneider
Vascular damage is aggravated in animal models of hypertension with mineralocorticoid (MR) excess and in hypertensive patients with primary hyperaldosteronism. MR antagonism has shown to provide effective blood pressure (BP)-control in patients with treatment resistant hypertension (TRH), but the concurrent effects on the vasculature have not been examined. In a randomized, double-blinded, placebo-controlled parallel-group study, 51 patients with TRH received either eplerenone 50 mg or placebo for 6 months together with additional antihypertensives titrated to achieve a BP target of <140/90 mm Hg...
February 17, 2017: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/28207773/local-versus-global-aortic-pulse-wave-velocity-in-early-atherosclerosis-an-animal-study-in-apoe-mice-using-ultrahigh-field-mri
#9
Alexander Gotschy, Wolfgang R Bauer, Patrick Winter, Peter Nordbeck, Eberhard Rommel, Peter M Jakob, Volker Herold
Increased aortic stiffness is known to be associated with atherosclerosis and has a predictive value for cardiovascular events. This study aims to investigate the local distribution of early arterial stiffening due to initial atherosclerotic lesions. Therefore, global and local pulse wave velocity (PWV) were measured in ApoE-/- and wild type (WT) mice using ultrahigh field MRI. For quantification of global aortic stiffness, a new multi-point transit-time (TT) method was implemented and validated to determine the global PWV in the murine aorta...
2017: PloS One
https://www.readbyqxmd.com/read/28202944/controversies-in-the-association-of-cardiorespiratory-fitness-and-arterial-stiffness-in-children-and-adolescents
#10
Joanna Meyer, Julia Elmenhorst, Tobias Giegerich, Renate Oberhoffer, Jan Müller
The relationship between cardiorespiratory fitness and arterial compliance in children and adolescents remains controversial. The aim of this study was to assess this association with a quantitative approach. A total of 646 healthy children and adolescents (316 females, age 13.9±2.1 years) were cross-sectionally investigated in seven school settings in and around Munich for their cardiorespiratory fitness and demographic, anthropometric and hemodynamic parameters. Surrogates of arterial stiffness, such as pulse wave velocity (PWV), Augmentation Index normalized to a heart rate of 75 (AI@75), and peripheral and central systolic blood pressures were measured in a supine position using the oscillometric Mobil-O-Graph...
February 16, 2017: Hypertension Research: Official Journal of the Japanese Society of Hypertension
https://www.readbyqxmd.com/read/28189039/low-dose-prednisolone-and-insulin-sensitivity-differentially-affect-arterial-stiffness-and-endothelial-function-an-open-interventional-and-cross-sectional-study
#11
Carolyn J Petersons, Brenda L Mangelsdorf, Anne Poljak, Malcolm D Smith, Jerry R Greenfield, Campbell H Thompson, Morton G Burt
BACKGROUND AND AIMS: Glucocorticoids could impair vascular function directly, or indirectly by reducing insulin sensitivity. The aim of this study was to determine the direct and indirect effects of acute and chronic low dose prednisolone on arterial stiffness and endothelial function. METHODS: Twelve subjects with inflammatory arthritis, who had not taken oral glucocorticoids for ≥6 months, and 12 subjects with inflammatory arthritis, taking chronic (>6 months) low dose (6...
January 31, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28183822/development-of-a-technique-for-determination-of-pulmonary-artery-pulse-wave-velocity-in-horses
#12
Gonçalo Teixeira de Almeida Silva, Bruce B Guest, Diego E Gomez, Martine McGregor, Laurent Viel, M Lynne O'Sullivan, John Runciman, Luis G Arroyo
Calcification of the tunica media of the axial pulmonary arteries (PA) has been reported in a large proportion of racehorses. In humans, medial calcification is a significant cause of arterial stiffening and is implicated in the pathogenesis of cardiac, cerebral and renal microvascular diseases. Pulse wave velocity (PWV) provides a measure of arterial stiffness. This study aimed to develop a technique to determine PA-PWV in horses, and secondarily to investigate a potential association between PA-PWV and arterial fibro-calcification...
February 9, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28180952/endothelial-dysfunction-during-long-term-follow-up-in-children-with-stec-hemolytic-uremic-syndrome
#13
Martin Kreuzer, Laura Sollmann, Stephan Ruben, Maren Leifheit-Nestler, Dagmar-Christiane Fischer, Lars Pape, Dieter Haffner
BACKGROUND: Shiga-toxin-producing Escherichia coli (STEC)-associated hemolytic-uremic syndrome (HUS) is a major cause of acute kidney injury (AKI), especially in children. Its long-term outcome with respect to endothelial damage remains largely elusive. METHODS: This was a cross-sectional study in 26 children who had suffered from STEC-HUS in the past and achieved a complete recovery of renal function (eGFR >90 ml/min/1.73 m(2)). Skin microcirculation after local heating was assessed by laser Doppler fluximetry, carotid-femoral pulse wave velocity (PWV), carotid intima media thickness (cIMT), 24-h ambulatory blood pressure, and angiopoietin (Ang) 1 and 2 serum levels after a median follow-up period of 6...
February 8, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28179448/the-igf-system-in-patients-with-type-2-diabetes-associations-with-markers-of-cardiovascular-target-organ-damage
#14
Rikke Hjortebjerg, Esben Laugesen, Pernille Høyem, Claus Oxvig, Brian Stausbøl-Grøn, Søren Tang Knudsen, Won Y Kim, Per Løgstrup Poulsen, Tk K Hansen, Mette Bjerre, Jan Frystyk
OBJECTIVE: Perturbations in the insulin-like growth factor (IGF) system may contribute to the accelerated cardiovascular disease (CVD) that occurs in patients with type 2 diabetes (T2D). However, it remains unknown whether the IGF system is also involved in the development of early, subclinical CVD. We characterised the IGF system in T2D patients and matched controls and examined associations with markers of subclinical target organ damage. METHODS: The study included 99 patients with recently diagnosed T2D and 99 age- and sex-matched controls...
February 8, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28178136/a-higher-baseline-plasma-uric-acid-level-is-an-independent-predictor-of-arterial-stiffness-a-community-based-prospective-study
#15
Xiao-Han Ding, Xiaona Wang, Ruihua Cao, Xu Yang, Wenkai Xiao, Yun Zhang, Yongyi Bai, Hongmei Wu, Ping Ye
Hyperuricemia has been demonstrated to be a risk factor for cardiovascular diseases. Though the association between uric acid (UA) and arterial stiffness has been investigated previously in patients with basic diseases, the predictive value of baseline UA level for arterial stiffness has not been conducted. We aimed at identifying the predictive role of UA for arterial stiffness prospectively.A longitudinal follow-up study in a routine health check-up population was performed with an average follow-up of 4...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28168512/automated-oscillometric-blood-pressure-and-pulse-wave-acquisition-for-evaluation-of-vascular-stiffness-in-atherosclerosis
#16
Alexander Massmann, Jennifer Stemler, Peter Fries, Reinhard Kubale, Lutz Erwin Kraushaar, Arno Buecker
OBJECTIVE: Evaluation of diagnostic accuracy of an oscillometry-based device (VascAssist) combining fully automated ankle-brachial index (ABI) and pulse-wave velocity (PWV) assessment for detection of peripheral arterial disease (PAD). SUBJECTS AND METHODS: 110 consecutive subjects including symptomatic PAD patients (n = 41) and healthy PAD-free participants (n = 69) were recruited. All subjects underwent standard manual Doppler-based ABI (sABI) and oscillometry-based automated ABI (aABI) measurements (VascAssist)...
February 6, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28166118/all-extremity-exercise-training-improves-arterial-stiffness-in-older-adults
#17
Han-Kyul Kim, Chueh-Lung Hwang, Jeung-Ki Yoo, Moon-Hyon Hwang, Eileen M Handberg, John W Petersen, Wilmer W Nichols, Sofia Sofianos, Demetra D Christou
: Large elastic arteries stiffen with age which predisposes older adults to increased risk for cardiovascular disease. Aerobic exercise training is known to reduce the risk for cardiovascular disease, but the optimal exercise prescription for attenuating large elastic arterial stiffening in older adults is not known. PURPOSE: The purpose of this randomized controlled trial was to compare the effect of all-extremity high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) on aortic pulse wave velocity (PWV) and carotid artery compliance in older adults...
February 4, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28158243/long-term-pulse-wave-velocity-outcomes-with-aerobic-and-resistance-training-in-kidney-transplant-recipients-a-pilot-randomised-controlled-trial
#18
Ellen M O'Connor, Pelagia Koufaki, Thomas H Mercer, Herolin Lindup, Eilish Nugent, David Goldsmith, Iain C Macdougall, Sharlene A Greenwood
BACKGROUND: This pilot study examined long-term pulse wave velocity (PWV) and peak oxygen uptake (VO2peak) outcomes following a 12-week moderate-intensity aerobic or resistance training programme in kidney transplant recipients. METHOD: Single-blind, bi-centre randomised controlled parallel trial. 42 out of 60 participants completed a 9-month follow-up assessment (Aerobic training = 12, Resistance training = 10 and usual care = 20). Participants completed 12 weeks of twice-weekly supervised aerobic or resistance training...
2017: PloS One
https://www.readbyqxmd.com/read/28156155/assessment-of-diastolic-dysfunction-arterial-stiffness-and-carotid-intima-media-thickness-in-patients-with-acromegaly
#19
Güven Barış Cansu, Nusret Yılmaz, Atakan Yanıkoğlu, Sebahat Özdem, Aytül Belgi Yıldırım, Gültekin Süleymanlar, Hasan Ali Altunbaş
OBJECTIVE: Early diagnosis and treatment of cardiovascular diseases, the most frequent cause of morbidity and mortality in acromegaly, may be an efficient approach to extending the lifespan of the affected patients. Therefore, it is crucial to determine any cardiovascular diseases in the subclinical period. The study objectives were to determine markers of subclinical atherosclerosis and asses heart structure and functioning. METHODS: This was a cross-sectional single-center study in 53 patients with acromegaly and 22 age- and sex-matched healthy individuals...
February 3, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/28154161/development-of-coronary-pulse-wave-velocity-new-pathophysiological-insight-into-coronary-artery-disease
#20
Brahim Harbaoui, Pierre-Yves Courand, Andrei Cividjian, Pierre Lantelme
BACKGROUND: Although aortic stiffness assessed by pulse wave velocity (PWV) is a strong predictor of coronary artery disease, the significance of local coronary stiffness has never been tackled. The first objective of this study was to describe a method of measuring coronary PWV (CoPWV) invasively and to describe its determinants. The second objective was to assess both CoPWV and aortic PWV in patients presenting with acute coronary syndromes or stable coronary artery disease. METHODS AND RESULTS: In 53 patients, CoPWV was measured from the delay in pressure wave and distance traveled as a pressure wire was withdrawn from the distal to the proximal coronary segment...
February 2, 2017: Journal of the American Heart Association
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