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https://www.readbyqxmd.com/read/27910551/x-ray-analysis-of-electron-bernstein-wave-heating-in-mst
#1
A H Seltzman, J K Anderson, A M DuBois, A Almagri, C B Forest
A pulse height analyzing x-ray tomography system has been developed to detect x-rays from electron Bernstein wave heated electrons in the Madison symmetric torus reversed field pinch (RFP). Cadmium zinc telluride detectors are arranged in a parallel beam array with two orthogonal multi-chord detectors that may be used for tomography. In addition a repositionable 16 channel fan beam camera with a 55° field of view is used to augment data collected with the Hard X-ray array. The chord integrated signals identify target emission from RF heated electrons striking a limiter located 12° toroidally away from the RF injection port...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910005/doppler-images-of-intra-pulmonary-shunt-within-atelectasis-in-anesthetized-children
#2
Cecilia M Acosta, Gerardo Tusman, Mauro Costantini, Camila Echevarría, Sergio Pollioto, Diego Abrego, Fernando Suarez-Sipmann, Stephan H Böhm
BACKGROUND: Doppler images of pulmonary vessels in pulmonary diseases associated with subpleural consolidations have been described. Color Doppler easily identifies such vessels within consolidations while spectral Doppler analysis allows the differentiation between pulmonary and bronchial arteries. Thus, Doppler helps in diagnosing the nature of consolidations. To our knowledge, Doppler analysis of pulmonary vessels within anesthesia-induced atelectasis has never been described before...
December 2016: Critical Ultrasound Journal
https://www.readbyqxmd.com/read/27908056/reconstruction-of-piano-hammer-force-from-string-velocity
#3
Antoine Chaigne
A method is presented for reconstructing piano hammer forces through appropriate filtering of the measured string velocity. The filter design is based on the analysis of the pulses generated by the hammer blow and propagating along the string. In the five lowest octaves, the hammer force is reconstructed by considering two waves only: the incoming wave from the hammer and its first reflection at the front end. For the higher notes, four- or eight-wave schemes must be considered. The theory is validated on simulated string velocities by comparing imposed and reconstructed forces...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27906841/annexin-a5-in-treated-hypertensive-patients-and-its-association-with-target-organ-damage
#4
Alessandro Maloberti, Paolo Meani, Paola Vallerio, Marisa Varrenti, Francesca Casadei, Francesco Musca, Rita Facchetti, Anna M Di Blasio, Susanna Ravassa, Giuseppe Mancia, Cristina Giannattasio
OBJECTIVE: Annexin A5 (AnxA5) has been previously linked to the presence of carotid and cardiac target organ damage (TOD) in the context of heart failure and rheumatologic patients. However, information is scant in the context of hypertension. Aim of our study was to evaluate AnxA5 in treated hypertension patients compared with normotensive controls and to determine whether it is associated with vascular and heart TOD evaluated as arterial stiffness, carotid plaque and left ventricular hypertrophy...
January 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/27906368/euv-scatterometer-with-a-high-harmonic-generation-euv-source
#5
Yi-Sha Ku, Chia-Liang Yeh, Yi-Chang Chen, Chun-Wei Lo, Wei-Ting Wang, Ming-Chang Chen
We have developed an extreme ultraviolet (EUV) scatterometer based on the analysis of coherent EUV light diffracted from a periodic array with nano-scale features. We discuss the choice of appropriate orders of the high harmonics generated coaxially along with the intense Ti:sapphire laser pulses for high resolution spatial performance. We describe an inverse-problem methodology for determining the structural parameters, and present preliminary measurement results confirming the functionality of the scatterometer...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906298/high-resolution-brillouin-optical-correlation-domain-analysis-with-no-spectral-scanning
#6
Eyal Preter, Dexin Ba, Yosef London, Orel Shlomi, Yair Antman, Avi Zadok
Distributed Brillouin fiber sensors typically rely on the reconstruction of the steady-state Brillouin gain spectrum (BGS), through spectral scanning of the frequency offset between the pump and signal waves. In this work, we propose and demonstrate an alternative approach, in which the local Brillouin frequency shift (BFS) is extracted from temporal transient analysis of the step response of the amplified signal wave. Measurements are taken at only two arbitrary frequency offsets between pump and signal. No spectral scanning and no prior knowledge of a reference BGS are necessary...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27899079/vasopressin-related-copeptin-is-a-novel-predictor-of-early-endothelial-dysfunction-in-patients-with-adult-polycystic-kidney-disease
#7
Ismail Kocyigit, Mahmut Ilker Yilmaz, Ozkan Gungor, Eray Eroglu, Aydin Unal, Ozcan Orscelik, Bulent Tokgoz, Murat Sipahioglu, Ahmet Sen, Juan Jesús Carrero, Oktay Oymak, Jonas Axelsson
BACKGROUND: In this study, we examined the relative usefulness of serum copeptin levels as a surrogate marker of vasopressin (AVP) in adult polycystic kidney disease (ADPKD) by correlating it with baseline and longitudinal changes in markers of both renal function and common CVD manifestations (hypertensive vascular disease, atherosclerosis and endothelial dysfunction) that accompany the progression of this disease. METHODS: We studied a cohort of young and otherwise healthy ADPKD patients (n = 235) and measured cardiovascular function using flow-mediation dilatation (FMD), carotid intima media thickness (cIMT) and pulse wave velocity (PWV), as well as serum copeptin (commercial ELISA, a stable marker of AVP activity)...
November 30, 2016: BMC Nephrology
https://www.readbyqxmd.com/read/27898419/high-pulse-wave-velocity-defines-a-very-high-cardiovascular-risk-cohort-of-dialysis-patients-under-age-60
#8
João Pedro Ferreira, Nicolas Girerd, Bruno Pannier, Patrick Rossignol, Gerard M London
BACKGROUND: Patients with end-stage renal disease (ESRD) are at a high risk of cardiovascular mortality (CVM). In patients with ESRD, arterial stiffness increases at an earlier age when compared to the general population and this contributes to the overall risk of cardiovascular mortality. The main objective of this study was to clarify the interplay between age and cardiovascular alterations in ESRD. METHODS: Prospective, observational cohort study initiated in April 1987 until the end of 1998 with events recorded until the end of the year 2000 at the F...
November 30, 2016: American Journal of Nephrology
https://www.readbyqxmd.com/read/27890833/pulse-wave-analysis-after-treatment-of-abdominal-aortic-aneurysms-with-the-ovation-device
#9
Efstratios Georgakarakos, Christos Argyriou, George S Georgiadis, Miltos K Lazarides
BACKGROUND: Ovation Aortic Stent-Graft System is a new device for the endovascular treatment of Abdominal Aortic Aneurysms achieving fixation via a 35-mm long, rigid ancored suprarenal stent and sealing stent at the infrarenal level by a means of a polymer-filling pair of inflatable O-rings which cause narrowing of flow lumen and regional stenosis. Thus, concerns have been raised regarding hemodynamic consequences associated with this new desing . Our preliminary report showed no significant increase of aortic pulse wave velocity (aPWV) immediately after implantation of the Ovation in 3 patients...
November 24, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27888530/perturbation-of-longitudinal-relaxation-rate-in-rotating-frame-plrf-analysis-for-quantification-of-chemical-exchange-saturation-transfer-signal-in-a-transient-state
#10
Yi Wang, Yaoyu Zhang, Xuna Zhao, Bing Wu, Jia-Hong Gao
PURPOSE: To develop a novel analytical method for quantification of chemical exchange saturation transfer (CEST) in the transient state. The proposed method aims to reduce the effects of non-chemical-exchange (non-CE) parameters on the CEST signal, emphasizing the effect of chemical exchange. METHODS: The difference in the longitudinal relaxation rate in the rotating frame ( ΔR1ρ) was calculated based on perturbation of the Z-value by R1ρ, and a saturation-pulse-amplitude-compensated exchange-dependent relaxation rate (SPACER) was determined with a high-exchange-rate approximation...
November 25, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27885999/peripheral-vasomotor-activity-assessment-using-a-continuous-wavelet-analysis-on-webcam-photoplethysmographic-signals
#11
F Bousefsaf, C Maaoui, A Pruski
BACKGROUND: Vasoconstriction and vasodilation phenomena reflect the relative changes in the vascular bed. They induce particular modifications in the pulse wave magnitude. Webcams correspond to remote sensors that can be employed to measure the pulse wave in order to compute the pulse frequency. OBJECTIVE: Record and analyze pulse wave signal with a low-cost webcam to extract the amplitude information and assess the vasomotor activity of the participant. METHODS: Photoplethysmographic signals obtained from a webcam are analyzed through a continuous wavelet transform...
November 25, 2016: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/27885499/the-effects-of-alpha-1-adrenoceptor-blockade-and-angiotensin-converting-enzyme-inhibition-on-central-and-brachial-blood-pressure-and-vascular-reactivity-the-doxazosin-ramipril-study
#12
Andreas Jekell, Majid Kalani, Thomas Kahan
We aimed to study whether inhibition of the renin-angiotensin-aldosterone system has effects on vascular structure and function beyond the effects on blood pressure reduction alone. Patients with mild-to-moderate hypertension (n = 61, age 54 ± 12 years, 34% women) received the angiotensin converting enzyme inhibitor ramipril 10 mg or the alpha 1-adrenoceptor blocker doxazosin 8 mg double-blind for 12 weeks. Aortic blood pressure, pulse wave velocity, and augmentation index were assessed by applanation tonometry...
November 24, 2016: Heart and Vessels
https://www.readbyqxmd.com/read/27885494/comparison-of-arterial-stiffness-compliance-in-the-ascending-aorta-and-common-carotid-artery-in-healthy-subjects-and-its-impact-on-left-ventricular-structure-and-function
#13
Olga Vriz, Julien Magne, Caterina Driussi, Gabriele Brosolo, Francesco Ferrara, Paolo Palatini, Victor Aboyans, Eduardo Bossone
Arterial stiffness and compliance parameters from two adjacent elastic arteries [aorta and common carotid artery (CCA)] were compared and their relationship with left ventricular (LV) structure and function and clinical parameters was assessed. 584 healthy subjects were prospectively enrolled [mean age 47.8 ± 18.4 years, range 16-94; 318 (54.4%) men]. They underwent comprehensive transthoracic echocardiography; M-mode diameters were measured at the level of the ascending aorta in systole and diastole and by echo-tracking at the level of the left CCA...
November 24, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27884431/computational-assessment-of-hemodynamics-based-diagnostic-tools-using-a-database-of-virtual-subjects-application-to-three-case-studies
#14
Marie Willemet, Samuel Vennin, Jordi Alastruey
Many physiological indexes and algorithms based on pulse wave analysis have been suggested in order to better assess cardiovascular function. Because these tools are often computed from in-vivo hemodynamic measurements, their validation is time-consuming, challenging, and biased by measurement errors. Recently, a new methodology has been suggested to assess theoretically these computed tools: a database of virtual subjects generated using numerical 1D-0D modeling of arterial hemodynamics. The generated set of simulations encloses a wide selection of healthy cases that could be encountered in a clinical study...
November 5, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27882423/cardio-ankle-vascular-index-cavi-and-plasma-transforming-growth-factor-%C3%AE-1-tgf-%C3%AE-1-level-correlate-with-aortopathy-in-adults-with-repaired-tetralogy-of-fallot
#15
Yumi Shiina, Koichiro Niwa
It is challenging to evaluate aortopathy in congenital heart disease using conventional investigations such as brachial-ankle pulse wave velocity (baPWV). Therefore, we evaluated the cardio-ankle vascular index (CAVI), a dimension of the ascending aorta and plasma transforming growth factor-β1 (TGF-β1) level, in order to find novel noninvasive parameters of aortopathy in adults with repaired tetralogy of Fallot (TOF). Prospectively, we enrolled 42 consecutive adults with TOF (28 patients with repaired TOF were not on ARB, 8 patients with repaired TOF on ARB, 6 patients with no repair or only palliative repair) and 20 age-matched healthy controls...
November 24, 2016: Pediatric Cardiology
https://www.readbyqxmd.com/read/27882404/reduced-trans-mitral-a-wave-velocity-predicts-the-presence-of-wild-type-transthyretin-amyloidosis-in-elderly-patients-with-left-ventricular-hypertrophy
#16
Satoru Yamamura, Yasuhiro Izumiya, Toshifumi Ishida, Yoshiro Onoue, Yuichi Kimura, Shinsuke Hanatani, Satoshi Araki, Koichiro Fujisue, Daisuke Sueta, Hisanori Kanazawa, Seiji Takashio, Hiroki Usuku, Koichi Sugamura, Kenji Sakamoto, Eiichiro Yamamoto, Megumi Yamamuro, Hisayo Yasuda, Sunao Kojima, Koichi Kaikita, Seiji Hokimoto, Hisao Ogawa, Kenichi Tsujita
Wild-type transthyretin amyloidosis (ATTRwt) is often overlooked in elderly patients with left ventricular hypertrophy (LVH). Impaired atrial function, in addition to ventricular diastolic dysfunction, is one of the hallmarks of cardiac amyloidosis. Here, we assessed the hypothesis that atrial function evaluated by A-velocity in pulse Doppler echocardiography is useful to differentiate ATTRwt in elderly patients with LVH. We analyzed 133 consecutive patients who underwent tissue biopsy to rule out infiltrative cardiomyopathy in our institute...
November 23, 2016: Heart and Vessels
https://www.readbyqxmd.com/read/27881850/relationship-between-asymptomatic-intra-cranial-lesions-and-brachial-ankle-pulse-wave-velocity-in-coronary-artery-disease-patients-without-stroke
#17
Noriaki Tabata, Daisuke Sueta, Takayoshi Yamashita, Daisuke Utsunomiya, Yuichiro Arima, Eiichiro Yamamoto, Kenichi Tsujita, Sunao Kojima, Koichi Kaikita, Seiji Hokimoto
Little is known about the significance of asymptomatic intra-cranial lesions (ICL) identified by brain MRI in coronary artery disease (CAD) patients. Silent cerebral lesions are suggested to be associated with arterial stiffness in healthy subjects. We investigated whether subclinical ICL are associated with arterial stiffness and the prognosis in CAD patients without medical history of cerebrovascular diseases. We recruited CAD patients who required percutaneous coronary intervention (PCI), did not meet exclusion criteria, and agreed with MRI before PCI...
November 24, 2016: Hypertension Research: Official Journal of the Japanese Society of Hypertension
https://www.readbyqxmd.com/read/27881094/neutrophil-lymphocyte-ratio-is-associated-with-arterial-stiffness-in-patients-with-peritoneal-dialysis
#18
Kedan Cai, Qun Luo, Beixia Zhu, Lina Han, Dan Wu, Zhiwei Dai, Kaiyue Wang
BACKGROUND: Patients with peritoneal dialysis are in the persistent inflammation state and have elevated arterial stiffness. Neutrophil-lymphocyte ratio(NLR) is a new inflammatory marker in renal and cardiac disorders. Brachial-ankle pulse wave velocity (baPWV) is a non-invasive measurement, which is widely used as a surrogate marker of arterial stiffness. However, there is little evidence to show an association between NLR and baPWV in patients with peritoneal dialysis. The aim of this cross-section study was to investigate the relationship between NLR and arterial stiffness measured by baPWV in patients with peritoneal dialysis...
November 24, 2016: BMC Nephrology
https://www.readbyqxmd.com/read/27880805/feasibility-of-quantification-of-intracranial-aneurysm-pulsation-with-4d-cta-with-manual-and-computer-aided-post-processing
#19
Till Illies, Dennis Saering, Manabu Kinoshita, Toshiyuki Fujinaka, Maxim Bester, Jens Fiehler, Noriyuki Tomiyama, Yoshiyuki Watanabe
BACKGROUND AND PURPOSE: The analysis of the pulsation of unruptured intracranial aneurysms might improve the assessment of their stability and risk of rupture. Pulsations can easily be concealed due to the small movements of the aneurysm wall, making post-processing highly demanding. We hypothesized that the quantification of aneurysm pulsation is technically feasible and can be improved by computer-aided post-processing. MATERIALS AND METHODS: Images of 14 cerebral aneurysms were acquired with an ECG-triggered 4D CTA...
2016: PloS One
https://www.readbyqxmd.com/read/27875812/hemodialysis-decreases-the-etiologically-related-early-vascular-aging-observed-in-end-stage-renal-disease-a-5-year-follow-up-study
#20
Daniel Bia, Cintia Galli, Yanina Zócalo, Rodolfo Valtuille, Sandra Wray, Ricardo Armentano, Edmundo Cabrera-Fischer
AIMS: To analyze the early vascular aging (EVA) in end-stage renal disease (ESRD) patients, attempting to determine a potential association between EVA and the etiology of ESRD, and to investigate the association of hemodialysis and EVA in ESRD patients during a 5-year follow-up period. METHODS: Carotid-femoral pulse wave velocity (cfPWV) was obtained in 151 chronically hemodialyzed patients (CHP) and 283 control subjects, and in 25 CHP, who were followed-up after a 5-year lapse...
November 23, 2016: Blood Purification
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