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Results 301 - 350 of 1845
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Jagadeesan B D - - 2012
SUMMARY:We retrospectively identified 9 consecutive children, 3 males and 6 females (age 5.2 ± 6.3 years, range 1 day to 18 years), with known or suspected AVGs who underwent MR imaging, including SWI, at our institution between January 2007 and March 2011. On the SWI sequence, arterialized blood flow was ...
Rutkowska G - - 2012
BACKGROUND AND PURPOSE:Flow simulations in patient-specific models of the subarachnoid space characterize CSF flow in more detail than MR flow imaging. We extended previous simulation studies by including cyclic CSF flow and patient-specific models in multiple patients with Chiari I. We compared simulation results with MR flow measurements.MATERIALS AND METHODS:Volumetric ...
van Slooten Ymkje J - - 2012
BACKGROUND: The staged Fontan procedure is used to palliate functionally univentricular hearts. The effect of additional pulmonary blood flow combined with a bidirectional cavopulmonary shunt in these patients remains a controversial subject. METHODS: This retrospective study included all 82 patients with a unilateral or bilateral bidirectional cavopulmonary shunt at our ...
Li Miaosi - - 2012
A response in writting: A low-cost bioactive paper device is designed to perform ABO and RhD blood typing tests, and the paper reports the results in writing. This idea was inspired by the vision of the British author, J. K. Rowling, through her novel "Harry Potter and the Chamber of ...
Williams J - - 2012
This study tested the hypothesis that variable freshwater flow in the Gippsland Lakes, Australia, influences the location and extent of environmental conditions suitable for spawning and larval development of black bream, Acanthopagrus butcheri. Freshwater flow had a large influence on the salinity and level of stratification (difference between bottom and ...
Dongaonkar Ranjeet M - - 2012
Venomotion, spontaneous cyclic contractions of venules, was first observed in the bat wing 160 years ago. Of all the functional roles proposed since then, propulsion of blood by venomotion remains the most controversial. Common animal models that require anesthesia and surgery have failed to provide evidence for venular pumping of ...
Masamoto Kazuto - - 2012
Anesthesia has broad actions that include changing neuronal excitability, vascular reactivity, and other baseline physiologies and eventually modifies the neurovascular coupling relationship. Here, we review the effects of anesthesia on the spatial propagation, temporal dynamics, and quantitative relationship between the neural and vascular responses to cortical stimulation. Previous studies have ...
Ju Zhaoyu - - 2012
BACKGROUND: Tissue expansion has been widely used to provide additional soft tissue for clinical reconstruction. Rapid expansion requires a much shorter clinical period than conventional expansion; however, less natural skin growth occurs resulting in a larger stretch-back ratio and insufficient extra soft tissue for clinical use. In this study, hyperbaric oxygen ...
Ren Hugang - - 2012
Speckle contrast based optical coherence angiography (OCA) and optical coherence Doppler tomography (ODT) have been applied to image cerebral blood flow previously. However, the contrast mechanisms of these two methods are not fully studied. Here, we present both flow phantom and in vivo animal experiments using ultrahigh-resolution OCA (μOCA) and ...
Katoh Chietsugu - - 2012
PURPOSE: Myocardial blood flow (MBF) estimation with (82)Rubidium ((82)Rb) positron emission tomography (PET) is technically difficult because of the high spillover between regions of interest, especially due to the long positron range. We sought to develop a new algorithm to reduce the spillover in image-derived blood activity curves, using non-uniform ...
Edelman Gerda - - 2012
Non-destructive identification and subsequent age estimation of blood stains are significant steps in forensic casework. The latter can provide important information on the temporal aspects of a crime. As previously shown, visible spectroscopy of blood stains on white backgrounds can successfully be used for their identification and age estimation. The ...
Grosse-Wortmann Lars - - 2012
OBJECTIVE: Aortopulmonary collaterals are a frequent phenomenon in patients after bidirectional cavopulmonary connection. The aortopulmonary collateral flow volume can be quantified using cardiac magnetic resonance imaging. However, the significance of aortopulmonary collateral flow for the postoperative outcome after total cavopulmonary connection is unclear and was sought to be determined. METHODS: ...
Salinet Angela S M - - 2012
This study aimed to compare the response of metabolic-induced cerebral hemodynamic changes measured using transcranial Doppler (TCD) ultrasonography during passive, active and motor imagery paradigms, and associated peripheral hemodynamic responses. Continuous recordings of bilateral cerebral blood flow velocity (CBFv), blood pressure, heart rate and end-tidal CO(2) were performed in 12 ...
Barr L L MRC/University Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK. - - 2012
There is increasing evidence that monocytes play a key role in the pathogenesis of acute lung inflammation. Mononuclear cell (MNC) leukapheresis can be used to remove large numbers of monocytes from circulating blood; however, the detailed characteristics of monocyte subpopulations removed by MNC leukapheresis, and the biological effects on the ...
Sharma Ritu - - 2012
PCR is usually performed on purified DNA. However, the extraction of DNA from whole blood is time consuming and involves the risk of contamination at every step. Hence, it is desirable to amplify DNA directly from whole blood. Earlier, investigators tried to achieve this target by either pretreatment of whole ...
Lutz H H - - 2012
BACKGROUND: Accurate quantification of liver fibrosis is essential for therapeutic decision-making and follow-up of chronic liver diseases. AIMS: To optimize the quality of non-invasive assessment of liver fibrosis in patients with chronic hepatopathy we compared Doppler ultrasound with liver histology and transient elastography (TE). METHODS: In this prospective observational study, ...
Amemiya Shiori - - 2012
The study aims to investigate the effect of cerebral ischemia or hypoperfusion in the evaluation of neural activity with blood-oxygen-level dependent (BOLD) functional magnetic resonance imaging (fMRI), and to examine whether the severity of the compromised hemodynamic status in patients with major cerebral artery diseases could, conversely, be assessed with ...
Lindholm J - - 2012
A previously healthy 60-year-old male presented with fever, general pain and a C-reactive protein (CRP) of 160 mg/L. He was prescribed doxycycline. In the emergency room three days later, he was intubated and had a saturation of 70% on 100% oxygen. The chest X-ray showed bilateral lobar pneumonia. Streptococcus pneumonia ...
Francis Richard O - - 2012
BACKGROUND: A uniform threshold strategy for converting from minipool (MP)-nucleic acid testing (NAT) to individual donation (ID)-NAT screening for acute West Nile virus (WNV) infection among blood donors is lacking. We report on WNV screening at the New York Blood Center during the 2010 seasonal WNV epidemic, the most severe ...
Cavuşoğlu Mustafa - - 2012
Most experiments assume a global transit delay time with blood flowing from the tagging region to the imaging slice in plug flow without any dispersion of the magnetization. However, because of cardiac pulsation, nonuniform cross-sectional flow profile, and complex vessel networks, the transit delay time is not a single value ...
Iwase Yoko - - 2012
INTRODUCTION: This study aimed to determine the effects of acute normovolemic hemodilution (ANH) using low-molecular-weight hydroxyethyl starch (LMW-HES) on intraoperative blood loss in patients who had received preoperative autologous blood donation (PABD) and had undergone sagittal split ramus osteotomy (SSRO). METHODS: Patients who had undergone SSRO were analyzed. All 250 ...
Crocker Matthew - - 2012
Tumor vasculature is a promising therapeutic target in glioblastoma. Imaging tumor blood flow may help assess the efficacy of anti-angiogenic treatments. We determined the clinical usefulness of stable xenon CT performed preoperatively in patients with glioblastoma. This is a prospective cohort study. We determined absolute tumor blood flow before surgery ...
Källman Ulrika - - 2012
källman u., bergstrand s., ek a.-c., engström m., lindberg l.-g. & lindgren m. (2012) Different lying positions and their effects on tissue blood flow and skin temperature in older adult patients. Journal of Advanced Nursing00(0), 000-000. doi: 10.1111/j.1365-2648.2012.06000.x ABSTRACT: Aim.  To report a study to compare the effects of different ...
Liao Lun-De - - 2012
Optical imaging of changes in total hemoglobin concentration (HbT), cerebral blood volume (CBV), and hemoglobin oxygen saturation (SO(2)) provides a means to investigate brain hemodynamic regulation. However, high-resolution transcranial imaging remains challenging. In this study, we applied a novel functional photoacoustic microscopy technique to probe the responses of single cortical ...
Matsuki Noriaki - - 2012
Microbubbles have been used in a variety of fields and have unique properties, for example shrinking collapse, long lifetime, efficient gas solubility, a negatively charged surface, and the ability to produce free radicals. In medicine, microbubbles have been used mainly as diagnostic aids to scan various organs of the body, ...
Harrison Christopher R - - 2012
Hemoglobin-based oxygen carriers (HBOCs) are blood substitutes, synthesized by polymerizing hemoglobin, which are being developed and investigated as alternatives to blood for medical purposes. However, due to their ability to increase the oxygen carrying capacity when taken by healthy individuals, HBOCs have been used as a doping agent among endurance ...
Muller Lisa I - - 2012
Physiologic monitoring is important when chemically immobilizing wildlife. Blood oxygenation is usually monitored by pulse oximetry in the field; however, there is some question whether this technique accurately reflects oxygen saturation in wild white-tailed deer (Odocoileus virginianus). We evaluated different doses of medetomidine (125, 150, 175, or 200 μg/kg) mixed ...
Gombotz Hans - - 2012
Patient Blood Management (PBM) describes an evidence-based, multidisciplinary therapeutic approach. Its focus is on the treatment of the individual patient and as such comprises transfusion therapy and pharmacotherapy. Furthermore, the applicability of PBM is not limited to the perioperative setting but is applicable also to other therapeutic measures and disciplines ...
Hansch Andreas - - 2012
OBJECTIVE: To assess the feasibility of time-resolved parallel three-dimensional magnetic resonance imaging (MRI) for quantitative analysis of pulmonary perfusion using a blood pool contrast agent. METHODS: Quantitative perfusion analysis was performed using novel software to assess pulmonary blood flow (PBF), pulmonary blood volume (PBV) and mean transit time (MTT) in ...
Chavan P D - - 2012
Microbiological contamination of blood and blood products is a well-recognised transfusion risk. This study was performed in the blood bank of our oncology centre, with an objective to detect bacterial contamination in our blood products using oxygen consumption as a surrogate marker [Pall Enhanced Bacterial Detection System (eBDS)]. Results revealed ...
Nam Kweon-Ho - - 2012
Previous studies have demonstrated that blood echogenicity is highly variable depending on blood flow velocity and pulsatility mainly due to the variation of red blood cell (RBC) aggregation. However, most of the studies were performed in a mock-flow loop using porcine blood and the results were not fully validated in ...
Song Ruibo - - 2012
The experiment was implemented to measure the multi-component blood flow velocity in elastic vascular phantoms. Poly (vinyl alcohol) cryogel, PVA-C, is presented as a tissue-mimicking material, suitable for application in ultrasound imaging. The hardness of PVA-C changed with the number of freeze-thaw cycles. Two kinds of PVA phantoms with different ...
Siewiorek Gail M - - 2012
Abstract Purpose: To compare the performance in vitro of 6 distal protection filters (DPFs) on the basis of filtration ability and effects on pressure gradient and vascular impedance in a flow model of the internal carotid artery (ICA). Methods: Six DPFs (Accunet, Angioguard, FilterWire, Gore Embolic Filter, NAV6, and SpiderFX) ...
Shen Zhi-Yong - - 2012
BACKGROUND: The purpose of this study was to investigate the relationship between blood supply detected by Doppler ultrasound and the Nottingham Prognostic Index (NPI) in breast cancer patients. PATIENTS AND METHODS: 137 patients with breast carcinoma, who had undergone color Doppler flow imaging (CDFI) and surgery, were involved in this ...
Lutz Austin - - 2012
Priapism is defined as an erection lasting greater than 4 hours. It is grouped into three subtypes: ischemic (low flow), nonischemic (high flow), and stuttering priapism. We present an interesting case and review of the conversion from a low-flow to a high-flow priapism. This conversion has rarely been reported. It ...
Alam Iftikhar - - 2012
Multicenter immune monitoring programs commonly rely on storing and shipping cryopreserved peripheral blood mononuclear cells (PBMC), isolated from whole blood before freezing. However, under many conditions in the field, facilities to separate PBMC are absent. Here, we investigate the feasibility of using whole blood (WB) frozen at -80°C as a ...
Tsui Po-Hsiang - - 2012
Detection of blood clotting by ultrasound has been widely explored. Many ultrasonic quantitative parameters have been demonstrated to have the ability to characterize clot. This study proposes the ultrasound Nakagami image as a tool to visually characterize the properties of blood clot. Whole blood samples with a hematocrit of 40% ...
Rios Danyelle R A - - 2012
Several studies have demonstrated that non-O blood groups subjects present an increased VTE risk as compared to those carrying O blood group. The aim of this study was to investigate the ABO blood groups influence on factor VIII (FVIII) activity, von Willebrand factor (VWF), and ADAMTS13 plasma levels in patients ...
Wright Cameron - - 2012
To characterize the ability of high-intensity focused ultrasound to achieve thrombolysis in vitro and investigate the feasibility of this approach as a means of restoring blood flow in thrombus-occluded arteries in vivo. All experiments were approved by the Institutional Animal Care Committee. Thrombolysis was performed with a 1.51-MHz focused ultrasound ...
Joy P J - - 2012
A significant proportion of all red cell transfusions are given to patients undergoing elective orthopaedic surgery. Concern over transfusion safety and cost, coupled with evidence showing that restrictive transfusion policies benefit patients, prompted us to audit our blood prescribing practice at Gloucestershire Hospitals NHS Foundation Trust in order to assess ...
Long Tobias C - - 2012
A challenge to the development of pediatric ventricular assist devices (PVADs) is the use of the aortic cannulae attached to the devices. Cannulae used for pediatric application have small diameters and large pressure drops. Furthermore, during the development of the 12cc Penn State pediatric PVAD, particle image velocimetry (PIV) illustrated ...
Pieracci Fredric M - - 2012
BACKGROUND: In vitro data suggest that erythrocytes undergo storage time-dependent degradation, eventuating in hemolysis. We hypothesize that transfusion of old blood, as compared with newer blood, results in a smaller increment in hematocrit. METHODS: We performed an analysis of packed red blood cell transfusions administered in the surgical intensive care ...
Neurath D - - 2012
BACKGROUND: Although the National blood system in Canada reduces the risk of inventory shortages the possibility of a blood supply shortage still exists. The Ontario Ministry of Health and Long-Term Care developed a provincial plan to manage blood transfusion needs and inventory in the event of a National blood shortage. ...
Li Xiang-Yang - - 2012
The aim of this study was to investigate the pharmacokinetics of sulfamethoxazole in native Han and Tibetan healthy Chinese subjects living chronically at high altitude. An open-labeled, controlled, prospective study was conducted in healthy Chinese male volunteers. Sulfamethoxazole 1,200 mg was administered orally to two groups: native Han and Tibetan volunteers ...
Harris M - - 2012
BACKGROUND: Blood samples banked for up to 1 month are typically used to perform pretransfusion testing in humans and small animals, but this has not been validated using blood from horses. HYPOTHESIS: Compatibility of equine blood samples is repeatable using fresh samples, and reproducible using donor blood samples stored for up ...
Değirmenci Aysu - - 2012
Malaria was expected to be a major problem during blood donation in Turkey due to existence of malaria cases in southeastern region of Turkey. The present study aimed for the first time, to investigate malaria in "donors deferred for malaria risk" and to determine the regional rates of malaria deferral ...
Mordini Federico E - - 2012
A time-resolved spin-labeled cineangiographic MRI technique for visualizing blood flow in the heart and defects of the atrial septum is described. The method utilizes a spin labeling preparation and a time-resolved balanced steady-state free precession imaging readout that enhances blood in the left atrium or right atrium and suppresses background ...
Tao S - - 2012
Faecal occult blood tests (FOBTs) are widely used for colorectal cancer (CRC) screening. Blood-based inflammatory markers have been suggested as alternative or supplementary non-invasive CRC screening tests. Among 179 CRC patients, 193 people with advanced adenoma and 225 people free of neoplasm, C-reactive protein (CRP), serum CD26 (sCD26), complement C3a ...
Roberson Russell S - - 2012
Stored red blood cells (RBCs) accumulate biochemical and biophysical changes. Maximum storage duration is based on acceptable in vitro characteristics and 24-hour survival, but not RBC function. Relatively little is known about the impact of RBC storage duration on oxygenation and the microcirculation. Eight healthy subjects donated a double RBC ...
Lee Daeho D Magnetic Resonance Systems Research Laboratory, Department of Electrical Engineering, Stanford University, Stanford, California, USA. - - 2012
When evaluating the severity of valvular stenosis, the peak velocity of the blood flow is routinely used to estimate the transvalvular pressure gradient. One-dimensional Fourier velocity encoding effectively detects the peak velocity with an ungated time series of spatially resolved velocity spectra in real time. However, measurement accuracy can be ...
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