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Obrubov S A SA N. I. Pirogov Russian National Research Medical University, Ministry of Health of the Russian Federation, Moscow, Russia, - - 2014
We studied disorders in ciliary body microcirculation in experimental chronic glomerulonephritis with tubulointerstitial nephritis and evaluated the hemodynamic effects of low-frequency pulsed electromagnetic field in this pathology. Laser Doppler flowmetry demonstrated vasospasm with reduced nutrient blood fl ow in the ciliary body of animals with experimental chronic glomerulonephritis with tubulointerstitial ...
Bian Shi-Zhu SZ Department of Cardiology, Institute of Cardiovascular Diseases of PLA, Xinqiao Hospital, Third Military Medical University, Chongqing, 400037, China, - - 2014
We aimed at identifying the cerebral hemodynamic characteristics of acute mountain sickness (AMS). Transcranial Doppler (TCD) sonography examinations were performed between 18 and 24 h after arrival at 3,700 m via plane from 500 m (n = 454). A subgroup of 151 subjects received TCD examinations at both altitudes. The velocities of the middle cerebral ...
Zhang Ruiying - - 2014
We present an optically encoded photoacoustic (PA) flow imaging method based on optical-resolution PA microscopy. An intensity-modulated continuous-wave laser photothermally encodes the flowing medium, and a pulsed laser generates PA waves to image the encoded heat pattern. Flow speeds can be calculated by cross correlation. The method was validated in ...
Rawy M S MS Department of Theriogenology, Faculty of Veterinary Medicine, Assiut University, 71526 Assiut, Egypt. Electronic address: - - 2014
The objectives of this study were to investigate the ovarian follicular waves and their corresponding hormonal changes in she-camels and to elucidate blood perfusion of the ovarian structures. Three reproductively sound, non-pregnant female camels were examined daily using B-mode and color Doppler to detect changes in their ovarian structures and ...
Mollard Rebecca C RC Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, ON M5S 3E2, - - 2014
This study investigated whether pulses (chickpeas, yellow peas, navy beans, lentils) have an effect on blood glucose (BG) and appetite following a fixed-size meal 2 h later. Over the following 2 h, all pulses lowered BG area under the curve (AUC) and lentils reduced appetite AUC compared with white bread ...
Yamada Hiroshi H Critical Care Division, Fujisawa City Hospital, 2-6-1 Fujisawa, Fujisawa, Kanagawa, 251-8550, Japan, - - 2014
The pulse CO-Oximeter (Radical-7; Masimo Corp., Irvine, CA) is a multi-wavelength spectrophotometric method for noninvasive continuous monitoring of hemoglobin (SpHb). Because evaluating the relative change in blood volume (ΔBV) is crucial to avoid hypovolemia and hypotension during hemodialysis, it would be of great clinical benefit if ΔBV could be estimated ...
Asano Kenichiro K Department of Nephrology, Kurashiki Central Hospital, 1-1-1 Miwa, Kurashiki 710-8602, Japan. - - 2014
Objectives- The aim of this study was to identify the main influencing factor of the shear wave velocity (SWV) of the kidneys measured by acoustic radiation force impulse elastography. Methods- The SWV was measured in the kidneys of 14 healthy volunteers and 319 patients with chronic kidney disease. The estimated ...
Guo Jia J Department of Bioengineering, University of California, San Diego, La Jolla, California, - - 2014
Velocity-selective arterial spin labeling (VSASL) tags arterial blood on a velocity-selective (VS) basis and eliminates the tagging/imaging gap and associated transit delay sensitivity observed in other ASL tagging methods. However, the flow-weighting gradient pulses in VS tag preparation can generate eddy currents (ECs), which may erroneously tag the static tissue ...
Flisar Karel K University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Biocybernetics, Trzaska 25, 1000 Ljubljana, Slovenia. Electronic address: - - 2014
Among other applications, electroporation is used for the inactivation of pathogens and extraction of substances from microorganisms in liquids where large scale flow systems are used. The aim of our work was therefore to test a pulse generator that enables continuous pulsed electric field (PEF) treatment for Escherichia coli inactivation ...
Tarumi Takashi T 1] Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, USA [2] Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, - - 2014
Blood ejected from the left ventricle perfuses the brain via central elastic arteries, which stiffen with advancing age and may elevate the risk of end-organ damage. The purpose of this study was to determine the impact of central arterial aging on cerebral hemodynamics. Eighty-three healthy participants aged 22 to 80 ...
Pase Matthew P MP Centre for Human Psychopharmacology, Swinburne University of Technology, Hawthorn, Australia, 3122. Electronic address: - - 2014
Low cerebral blood flow velocity is associated with cognitive decline. However, the association between pulsatile brain blood flow velocity and cognition has not been investigated. High pulsatile hemodynamic stress in the brain may impair cognitive function through damage to small cerebral vessels. The current objective was to examine the cross-sectional ...
Rossow Lindy M LM Fitchburg State University, 155 North St, Fitchburg, MA 01420, USA. Electronic address: - - 2014
Resistance training is recommended for all adults of both sexes. The arterial stiffness and limb blood flow responses to resistance training in young and older women have not been well-studied. The purpose of this study was to examine arterial stiffness and blood flow adaptations to high-intensity resistance exercise training in ...
Vrselja Zvonimir Z 1] Department of Anatomy and Neuroscience, Medical School of J. J. Strossmayer University in Osijek, Osijek, Croatia [2] Department of Radiology, Osijek University Medical Center, Osijek, - - 2014
Nearly 400 years ago, Thomas Willis described the arterial ring at the base of the brain (the circle of Willis, CW) and recognized it as a compensatory system in the case of arterial occlusion. This theory is still accepted. We present several arguments that via negativa should discard the compensatory ...
Crespo Gastón A - - 2014
We explore here for the first time a potentially calibration-free methodology for the detection of protamine (and, by titration, heparin) in undiluted human blood in the therapeutic concentration range of 20 to 120 mg L-1. The use of a thin layer sample (5.8 μL) confined between a tubular protamine selective ...
Flück Daniela D Department of Biology, Institute of Human Movement Sciences and Sport, ETH Zurich Zurich, Switzerland ; Department of Physiology and Pharmacology, Faculty of Medicine, University of Calgary Calgary, AB, - - 2014
Aging is associated with decreased vascular compliance and diminished neurovascular- and hypercapnia-evoked cerebral blood flow (CBF) responses. However, the interplay between arterial stiffness and reduced CBF responses is poorly understood. It was hypothesized that increased cerebral arterial stiffness is associated with reduced evoked responses to both, a flashing checkerboard visual ...
Lefferts Wesley K WK Department of Exercise Science, Syracuse University Syracuse, NY, - - 2014
Arterial stiffness is associated with cerebral flow pulsatility. Arterial stiffness increases following acute resistance exercise (RE). Whether this acute RE-induced vascular stiffening affects cerebral pulsatility remains unknown. To investigate the effects of acute RE on common carotid artery (CCA) stiffness and cerebral blood flow velocity (CBFv) pulsatility. Eighteen healthy men ...
Nitzan Meir M Department of Physics/Electro-Optics, Jerusalem College of Technology, Jerusalem, - - 2014
Oxygen saturation in the arterial blood (SaO2) provides information on the adequacy of respiratory function. SaO2 can be assessed noninvasively by pulse oximetry, which is based on photoplethysmographic pulses in two wavelengths, generally in the red and infrared regions. The calibration of the measured photoplethysmographic signals is performed empirically for ...
Djelic Marina - - 2013
In the frame of a laboratory training course for medicine students, a new approach for laboratory exercises has been applied to teach the phenomena of circulation. The exercise program included measurements of radial artery blood flow waveform for different age groups using a noninvasive optical sensor. Arterial wave reflection was ...
Al-Khabori Murtadha - - 2013
Non-invasive hemoglobin estimation may increase the recruitment of blood donors. CO-oximetry hemoglobin estimation is a non-invasive method used to estimate the hemoglobin level. The primary objective of this study is to validate the pulse CO-oximetry based hemoglobin estimation in normal blood donors. We conducted a prospective observational study on 106 ...
- - 2013
A pulse wave is the displacement wave which arises because of ejection of blood from the heart and reflection at vascular bed and distal point. The investigation of pressure waves leads to understanding the propagation characteristics of a pulse wave. To investigate the pulse wave behavior, an experimental study was ...
Bopp Christopher M - - 2013
The associations between macrovascular and microvascular responses reported previously during post-occlusive reactive hyperemia have been inconsistent. The purpose of this study was therefore to determine the temporal relationship between the reactive hyperemic responses within a conduit artery and the downstream microvessels. Conduit artery blood flow was measured in the brachial ...
Niklas A - - 2013
Noninvasive optical methods such as photoplethysmography, established for blood pulse detection in organs, have been proposed for vitality testing of human dental pulp. However, no information is available on the mechanism of action in a closed pulp chamber and on the impairing influence of other than pulpal blood flow sources. ...
Scully Stephanie - - 2013
The aim was to characterize dominant follicle (DF) and CL development through the estrous cycle of cattle using three-dimensional (3D) ultrasonography while making a comparison with conventional two-dimensional (2D) B-mode ultrasound (US) and to relate the measures taken to systemic concentrations of steroid hormones and gonadotropins. After synchronization of estrus, ...
Kyriacou Panayiotis A - - 2013
BACKGROUND:Pulse oximetry is a noninvasive photometric technique that provides information about arterial blood oxygen saturation (Spo2) and heart rate and has widespread clinical applications. This is accomplished via peripheral pulse oximetry probes mainly attached to the finger, toe, or earlobe. The direct application of pulse oximetry to an organ, such ...
Bernal Miguel - - 2013
The assessment of coagulating blood elasticity has gained importance as a result of several studies that have correlated it to cardiovascular pathologic conditions. In this study we use supersonic shear wave imaging (SSI) to measure viscoelastic properties of blood clots. At the same time, classical rheometry experiments were carried out ...
Nebyla Marek M Department of Chemical Engineering, Institute of Chemical Technology, Prague, Czech - - 2013
We study effects of oscillatory convective flow in extracellular space on the velocity of chemical signal propagation having a form of a front wave above a cellular layer. We found that the time-averaged propagation velocity under oscillatory flow for a particular Péclet number amplitude is slower than the velocity under ...
Sone Shusaku - - 2013
We developed a simultaneous analysis system for blood pressure and flow using photoplethysmography and ultrasonic-measurement-integrated simulation. The validity of the system was confirmed by analysis of blood flow field in a carotid artery and corresponding wave intensity (WI) values.
Hashimoto Junichiro - - 2013
Aortic stiffening often precedes cardiovascular diseases, including stroke, but the underlying pathophysiological mechanisms remain obscure. We hypothesized that such abnormalities could be attributable to altered central blood flow dynamics. In 296 patients with uncomplicated hypertension, Doppler velocity pulse waveforms were recorded at the proximal descending aorta and carotid artery to ...
Jain Ashish A Department of Pharmaceutical Sciences, Dr. Hari Singh Gour University, Sagar, MP 470003, - - 2013
Clarithromycin is an antibacterial widely used for the treatment of a myriad of infections. Various methods including HPLC have been reported for its drug plasma concentration but they are more complex. In this study, we developed an electrochemical method for estimation of clarithromycin in blood using differential pulse polarography (DPP) ...
Shi Liang L Department of Biomedical Engineering, Oregon Health and Science University, Portland, OR 97239, - - 2013
Hemodynamic conditions play a critical role in embryonic cardiovascular development, and altered blood flow leads to congenital heart defects. Chicken embryos are frequently used as models of cardiac development, with abnormal blood flow achieved through surgical interventions such as outflow tract (OFT) banding, in which a suture is tightened around ...
Caruso Brian S - - 2013
In mountain braided rivers, extreme flow variability, floods and high flow pulses are fundamental elements of natural flow regimes and drivers of floodplain processes, understanding of which is essential for management and restoration. This study evaluated flow dynamics and invasive vegetation characteristics and changes in the Ahuriri River, a free-flowing ...
Hiraiwa Tetsuya T Hiraiwa Thyroid Clinic, Ibaraki City, Osaka Medical College, Takatsuki City, Japan ; Department of Internal Medicine (I), Osaka Medical College, Takatsuki City, - - 2013
Color Doppler ultrasonography (CDU) has not yet been established as a method to investigate the pathogenesis of thyrotoxicosis. Our first objective was to determine whether the measurement of peak systolic blood-flow velocity in the superior thyroid artery (STV) and thyroid tissue blood flow (TBF) using CDU could differentiate Graves' disease ...
Caruso Brian S - - 2013
This study evaluated flow regimes and flood pulse characteristics, and their influences on invasive riparian vegetation, in a free-flowing braided river in the Southern Alps, South Island, New Zealand. A 46-year gauged flow record was used to evaluate 67 flow metrics for the Ahuriri River, and five sets of colour ...
Ginther O J - - 2013
On Day 16 (Day 0 = ovulation) or before the expected transition into the luteolytic period, heifers were not treated (control group, N = 7) or were treated with a single 0.1-mg dose of estradiol (E2) (E2 group, N = 6) or E2 combined with the GnRH antagonist acyline (E2/Ac ...
Gutfreund Shay - - 2013
BACKGROUND: Metabolic syndrome (MetS) is characterized by obesity, insulin resistance, dyslipidemia, and hypertension. The Retinal Function Imager (RFI) is a new technique for measuring retinal blood-flow velocity. This study aims to compare retinal blood flow velocity between MetS and healthy subjects. METHODS: Twenty eyes of 20 MetS males and 21 ...
Huang Chih-Chung - - 2013
Purpose: Measurements of the viscoelastic properties of a thrombus can be used to assess whether blood clots are likely to become occlusive or to break apart and leak into the blood circulation and block smaller vessels. An accurate method for estimating both the shear elasticity and viscosity of a blood ...
Sebbane Mustapha - - 2013
Study objective:The RAD-57 pulse CO-oximeter is a lightweight device allowing non-invasive measurement of blood carboxyhemoglobin (SpCO).We assessed the diagnostic value of pulse CO-oximetry, comparing SpCO to standard laboratory blood measurement (COHb) in emergency department (ED) patients with suspected carbon monoxide (CO) poisoning.Methods:This was a prospective, diagnostic accuracy study according to ...
Zelli R - - 2013
This study was carried out with the objectives to test the differences in the haemodynamic characteristics of the prostatic artery in normal and benign prostatic hyperplasia (BPH)-affected dogs using Doppler ultrasonography. In sixteen male German shepherd dogs, prostatic volume was detected and prostatic biopsy was performed. The prostatic artery blood ...
Yiu Billy Y S - - 2013
Realization of flow imaging at high frame rates is essential to the visualization of complex flow patterns with fast-changing spatiotemporal dynamics. In this study, we present an experimental demonstration of a novel ultrasound-based high-frame-rate flow visualization technique called color-encoded speckle imaging (CESI), which depicts flow information in a hybrid form ...
Feiner John R - - 2013
BACKGROUND:Carbon monoxide poisoning is a significant problem in most countries, and a reliable method of quick diagnosis would greatly improve patient care. Until the recent introduction of a multiwavelength "pulse CO-oximeter" (Masimo Rainbow SET® Radical-7), obtaining carboxyhemoglobin (COHb) levels in blood required blood sampling and laboratory analysis. In this study, ...
Mynard Jonathan P - - 2013
Given evidence that fully developed axisymmetric flow may be the exception rather than the rule, even in nominally straight arteries, maximum velocity (Vmax) can lie outside the Doppler sample volume (SV). The link between Vmax and derived quantities, such as volume flow (Q), may therefore be more complex than commonly ...
Kim Jongyoun - - 2013
PWV, a surrogate marker for vascular stiffness, can be also expressed by the Bramwell-Hill equation. The effect of blood density to PWV has been ignored, because variation of blood density is assumed to be negligible. In some clinical situation, blood density could be changed, and blood density as a mechanical ...
Lis Raphael - - 2013
Comment on: Rafii S, et al. Blood 2013; 121:770-80.
Reising Ansgar - - 2013
Patients undergoing hemodialysis treatment have a six-fold increased risk for stroke relative to the general population. However, the effect of hemodialysis on cerebral blood flow is poorly studied and confounding factors like blood pressure and ultrafiltration as well as temperature changes have rarely been accounted for. The aim of our ...
Kregting Louise T - - 2013
Broadcast spawning invertebrates that live in shallow, high-energy coastal habitats are subjected to oscillatory water motion that creates unsteady flow fields above the surface of animals. The frequency of the oscillatory fluctuations is driven by the wave period, which will influence the stability of local flow structures and may affect ...
Heffernan Kevin S KS Department of Exercise Science, Syracuse University, Syracuse, NY 13244, - - 2013
Background. The contour of the common carotid artery (CCA) blood flow velocity waveform changes with age; CCA flow velocity increases during late systole, and this may contribute to cerebrovascular disease. Late systolic flow velocity augmentation can be quantified using the flow augmentation index (FAIx). We examined hemodynamic correlates of FAIx ...
Langham Michael C MC Department of Radiology, University of Pennsylvania Medical Center, Philadelphia, PA 19104, - - 2013
The aim of this study was to develop and evaluate an integrated CMR method incorporating dynamic oximetry, blood flow and pulse-wave velocimetry to assess vascular reactivity in patients with peripheral artery disease (PAD) and healthy controls. The study population consisted of young healthy subjects (YH, 30 ± 7 yrs, N = 19),PAD (71 ± 9 yrs, ...
Zhang X - - 2012
The longitudinal relaxation time of blood is a crucial parameter for quantification of cerebral blood flow by arterial spin labeling and is one of the main determinants of the signal-to-noise ratio of the resulting perfusion maps. Whereas at low and medium magnetic field strengths (B(0) ), its in vivo value ...
Van Canneyt Koen - - 2012
Purpose: Maturation of an arterio-venous fistula (AVF) frequently fails, with low post-operative fistula flow as a prognostic marker for this event. As pulsed wave Doppler (PWD) is commonly used to assess volume flow, we studied the accuracy of this measurement in the setting of a radio-cephalic AVF. Methods: As in-vivo ...
Park Yong-Hee YH Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, 101 Daehakno, Jongnogu, Seoul 110-744, - - 2012
The most common method for determining the hemoglobin concentration is to draw blood from a patient. However, the Radical-7 Pulse CO-Oximeter (Masimo Corporation, Irvine, CA) can noninvasively provide continuous hemoglobin concentration (SpHb). In our study we compared noninvasive measurements of SpHb with simultaneous laboratory measurements of total hemoglobin in arterial ...
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