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Results 351 - 400 of 1830
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Cloutier Marie-Soleil - - 2012
BACKGROUND: Many studies on factors that can affect the frequency of blood donation have shown the influence of several individual characteristics. However, few studies have analyzed regional variations in blood donation frequency. The objective of this article is to verify to what extent individual and geographic variables influence blood donation ...
Cao Ye - - 2012
It is necessary to remove residual leukocytes to prevent the blood transfusion-related adverse reactions. This paper describes a facile approach for the surface modification of commercial PBT nonwoven fabrics (PBTNF), used for blood filtration, followed by immobilizing polyvinylpyrrolidone (PVP). The whole blood filtration results revealed that the five types of ...
Hammer Daniel X - - 2012
Blood flow in murine epicardial and intra-myocardial coronary arteries was measured in vivo with spectral domain optical Doppler tomography (SD-ODT). Videos at frame rates up to 180 fps were collected and processed to extract phase shifts associated with moving erythrocytes in the coronary arteries. Radial averaging centered on the vessel ...
Tong Yunjie - - 2012
Blood Oxygen Level Dependent (BOLD) functional magnetic resonance imaging (fMRI) measures changes in blood oxygenation, which is affected by physiological processes, including cardiac pulsation, breathing, and low frequency oscillations (LFO). It is challenging to identify spatial and temporal effects of these processes on the BOLD signal because the low sampling ...
Baek Jin Hyen - - 2012
Hemoglobin (Hb)-based oxygen carriers (HBOCs) are being developed as resuscitative fluids for use in multiple medical applications and in lieu of blood transfusion. However, cardiovascular, central nervous system, and renal adverse events have largely impeded progress. This has prompted a need to evaluate novel down selection approaches for HBOCs prior ...
Wolf Robert Christian - - 2012
Behavioral and neuroimaging studies in patients with borderline personality disorder (BPD) have associated orbitofrontal cortex (OFC) dysfunction with distinct symptom clusters such as impulsivity. It is unclear, however, whether abnormal patterns of OFC activity are also present during resting-state conditions and whether OFC dysfunction is specifically associated with impulsivity in ...
Randriamanantany Z A - - 2012
PURPOSE OF THE STUDY: Due to anemia and maternal, childhood and infancy diseases, blood transfusion is one of the most important medical cares given in sub-Saharan Africa, including Madagascar. World Health Organization encourages worldwide countries to maximize transfusion security. Until now, there was no data within a large population of ...
Segura J - - 2012
The use of blood doping is forbidden by the World Anti-Doping Agency. Several practices, such as blood transfusions are used to increase oxygen delivery to muscles and all of them are highly pursued. In this regard, the development of accurate methodologies for detecting these prohibited practices is one of the ...
Koning Nick J - - 2012
The onset of nonpulsatile cardiopulmonary bypass is known to deteriorate microcirculatory perfusion, but it has never been investigated whether this may be prevented by restoration of pulsatility during extracorporeal circulation. We therefore investigated the distinct effects of nonpulsatile and pulsatile flow on microcirculatory perfusion during on-pump cardiac surgery. Patients undergoing ...
Muzzarelli Stefano - - 2012
PURPOSE:: We aimed to describe and compare azygos vein flow patterns of patients with obstructed and unobstructed systemic venous baffle after atrial switch repair for d-transposition of the great arteries (TGA). We hypothesized that phase-contrast magnetic resonance imaging would enable characterization of retrograde collateral flow across the azygos vein in ...
Mangual J O - - 2012
Visualization of the three-dimensional flow within the Right Ventricle (RV) is a challenging issue due to the fully three-dimensional geometry of the ventricular cavity. To date proper characterization and quantification of the RV flow still remains incomplete, and techniques that can be easily applied to current medical imaging are scarce. ...
Cheng Xian-Feng - - 2012
To investigate the seroprevalence and molecular characteristics of hepatitis E virus (HEV) in the illegal blood donors (IBDs) of central China in the early 1990s. A total of 546 blood samples were collected from the IBDs in Maanshan city, a questionnaire was completed by each subject, detailing the age, sex, ...
Wang Xiao - - 2012
The perfusion contribution to the total functional magnetic resonance imaging (fMRI) signal was investigated using a rat model with mild hypercapnia at 9.4 T, and human subjects with visual stimulation at 4 T. It was found that the total fMRI signal change could be approximated as a linear superposition of 'true' blood ...
Kim Seong-Gi - - 2012
After its discovery in 1990, blood oxygenation level-dependent (BOLD) contrast in functional magnetic resonance imaging (fMRI) has been widely used to map brain activation in humans and animals. Since fMRI relies on signal changes induced by neural activity, its signal source can be complex and is also dependent on imaging ...
Serra Mariana - - 2012
BACKGROUND: The Sysmex XT-2000iV is a hematology analyzer that combines impedance and optical techniques and has been previously validated for dogs. Specific reference intervals (RIs) are useful when interpreting results. OBJECTIVES: The aim of this study was to determine hematologic RIs for the Sysmex XT-2000iV using a large reference population ...
Meng L L Department of Anesthesiology and Perioperative Care, University of California Irvine Medical Center, Orange, CA 92868, USA. - - 2012
Multiple studies have shown that cerebral tissue oxygen saturation (Sct(O(2))) is decreased after phenylephrine treatment. We hypothesized that the negative impact of phenylephrine administration on Sct(O(2)) is affected by arterial blood carbon dioxide partial pressure (Pa(CO(2))) because CO(2) is a powerful modulator of cerebrovascular tone. In 14 anaesthetized healthy patients, ...
Alcover M Magdalena - - 2012
Epidemiological studies on the distribution of leishmaniasis caused by Leishmania infantum Nicolle, 1908 (Kinetoplastida: Trypanosomatidae) have been based principally on serological surveys of the canine reservoir. This methodology is useful due to the facility of sampling, the rapidity in obtaining results, its consistency and because it allows the detection of ...
Chen Shu-Huey - - 2012
Maternal-fetal ABO incompatibility is one of the causes of neonatal hyperbilirubinemia. We postulate that hemoglobin (Hb), hematocrit (Hct), and red blood cell (RBC) values for cord blood units (CBUs) are lower and erythroblast values higher for maternal-fetal ABO incompatible dyads than for compatible dyads. We investigated the relationship between Hb, ...
Zimmermann-Baer Urs - - 2012
A baby girl, born at term, presented with severe cyanosis and received oxygen supplementation. Consecutive arterial blood gas analysis showed a pronounced right shift of the saturation curve, suggesting the presence of a hemoglobin (Hb) variant. A new (G)γ-globin variant was detected, namely HBG2:c.308G, which we have named Hb F-Sarajevo, ...
Lavery G G - - 2012
Oxygen is one of the most widely used drugs. It is important to recognise that oxygen administration carries risks as well as benefits. While adequate oxygen saturation of arterial blood is an important factor in tissue oxygen delivery, oxygen administration to patients with chronic obstructive pulmonary disease can lead to ...
Chin David A - - 2012
A method is proposed to relate the statistics of in-stream bacteria concentrations to the surface-runoff fraction of stream flow. The parameters of this relationship include the characteristic concentration of bacteria in surface runoff and the characteristic concentration of bacteria in the base flow, and these parameters can be derived from ...
Molema Grietje - - 2012
Blood vessels and their endothelial lining are uniquely adapted to the needs of the underlying tissue. The structure and function of the vasculature varies both between and within different organs. In the kidney, the vascular architecture is designed to function both in oxygen/nutrient delivery and filtration of blood according to ...
Homsy Alexandra - - 2012
Clinical point of care testing often needs plasma instead of whole blood. As centrifugation is labor intensive and not always accessible, filtration is a more appropriate separation technique. The complexity of whole blood is such that there is still no commercially available filtration system capable of separating small sample volumes ...
Zur B - - 2012
Background For CSF analysis, exact knowledge of the type and amount of cells is essential, especially for detection of infection or bleeding. The chamber count has been the current reference method to date, yet it is problematic due to its subjectivity depending on the examiner's skill and experience. Therefore, as ...
Krairittichai Udom - - 2012
The rope-ladder technique is the traditional AVF cannulation technique for HD. The buttonhole technique with repeated puncture with a blunt AV needle into a single selected site of AVF is a reliable alternative technique and has been used in Thailand for a few years. The ultrasound dilution technique is a ...
Huang T L - - 2012
The aim of this study was to evaluate portal vein stenosis (PVS) in pediatric liver transplantation (PLT) using Doppler ultrasound (DUS) before and after interventional management for hemodynamic changes. From 2000 to 2010, we encountered 11 PVS cases among 180 PLT that were evaluated using DUS and computed tomography (CT) ...
Wang Xiaohua - - 2012
The purpose of this investigation was to use combined transcranial cerebral Doppler (TCD) and near-infrared spectroscopy cerebral oxygen saturation (NIRS) during total aortic arch replacement (TAAR) to monitor middle cerebral artery blood flow velocity and regional cerebral oximetry (rSO2) changes to provide a clinical basis for protective measures that may ...
Leahy M F - - 2012
The ageing population in developed countries, including Australia, is putting increasing demands on blood transfusion services. With a falling donor pool there is likely to be a shortage of blood and blood products in the next 20 to 30 years unless there are significant changes in medical practice. The National Health ...
Gurovich Alvaro N - - 2012
Blood flow-induced endothelial shear stress (ESS) during aerobic (AX) and resistance (RX) exercise can regulate endothelial function. However, non-invasive in vivo ESS estimation is normally obtained only according to Poiseuille's laws for streamline flow, rather than using Womersley's approximation for pulsatile flows. Here, we sought to determine brachial and femoral ...
Huang Tao - - 2012
To compare the effects on the body surface of different kinds of placebo/sham acupuncture with that of traditional needling sensation acupuncture. Point Neiguan (PC 6) of 29 healthy subjects, 19 males and 10 females, was stimulated with needling sensation, shallow, placebo and deep acupuncture at the non-acupoint. After stimulation with ...
Kramer Kim - - 2012
Successful delivery of intraventricular radioimmunotherapy is contingent on adequate CSF flow. The authors present a patient with medulloblastoma in whom obstructed CSF flow was causing hydrocephalus, which was initially corrected by implantation of a programmable shunting device. While managing the hydrocephalus, an endoscopic third ventriculostomy (ETV) needed to be performed ...
Preston Thomas J - - 2012
The successful use of prolonged extracorporeal life support with a heart-lung machine was first performed in 1972, as described by Hill et al., on a young man with post-traumatic respiratory failure. The first successful use of extracorporeal membrane oxygenation (ECMO) was 1976 by Bartlett et al. Since this time, the ...
Jiang Yan - - 2012
The metabolic rate of oxygen consumption, an important indicator of tissue metabolism, can be expressed as the change of net blood oxygen flux into and out of a tissue region per 100 g of tissue. In this work, we propose a photoacoustic and Doppler ultrasound method for imaging local blood ...
Sengupta Partho P - - 2012
Blood flow patterns are closely linked to the morphology and function of the cardiovascular system. These patterns reflect the exceptional adaptability of the cardiovascular system to maintain normal blood circulation under a wide range of workloads. Accurate retrieval and display of flow-related information remains a challenge because of the processes ...
Murase Hiroshi - - 2012
To evaluate the associations of circulating levels of proinflammatory molecules and endothelial factors with blood flow in lower-leg arteries in diabetic patients with normal ankle-brachial index (ABI>0.9). We enrolled 123 type 2 diabetic patients with normal ABI and 30 age-matched nondiabetic subjects consecutively admitted to our hospital. Flow volume and ...
Lim Eugene J - - 2012
Inertial microfluidics has demonstrated the potential to provide a rich range of capabilities to manipulate biological fluids and particles to address various challenges in biomedical science and clinical medicine. Various microchannel geometries have been used to study the inertial focusing behavior of particles suspended in simple buffer solutions or in ...
Forti Alessandro - - 2012
OBJECTIVE: The flow rate of the cardiopulmonary bypass (CPB) pump used in cardiac surgery often undergoes inherent fluctuations ranging from 10% to 20% of its theoretic value. However, the effects of such alterations remain unknown. In the present study, the authors investigated whether such variations could induce changes in the ...
Lim Dong Yun - - 2012
A low fraction of inspired oxygen (FiO(2)) increases venous deoxygenated hemoglobin concentrations, making the color of the blood darker. The present study was aimed to determine the effects of FiO(2) on the ability to discriminate venous from arterial blood. One-hundred and sixty surgical patients undergoing percutaneous central venous access of ...
Quraishi Rizwana - - 2012
Dried blood spotted on to filter paper has been found suitable for a large number of studies. In tropical countries with varying temperature conditions the use of dried blood needs to be validated. We carried out this study to assess the use of blood spotted filter paper as a transport ...
Wang Liu-Hong - - 2012
To assess the blood flow of the proper digital artery using digital subtraction angiography (DSA) in the early stage after replantation. From January 2006 to October 2010, 27 anastomosed arteries in 27 replanted digits were included in the study. The patients included nine males and four females. The patients received ...
Wu Pei-Ju - - 2012
The aim of this study was to present our experience with a novel approach called the pierce and push (PP) method which uses a stainless steel centimeter probe instead of a 5 mm claw forceps to enucleate fibroids in a laparoscopic myomectomy (LM). A retrospective chart review of 90 women ...
Buckley Erin M EM University of Pennsylvania, Department of Physics and Astronomy, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, USA. - - 2012
Diffuse correlation spectroscopy (DCS) is a novel optical technique that appears to be an excellent tool for assessing cerebral blood flow in a continuous and non-invasive manner at the bedside. We present new clinical validation of the DCS methodology by demonstrating strong agreement between DCS indices of relative cerebral blood ...
Akilli Nazire Belgin - - 2012
PURPOSE: The purpose of this study is to investigate whether there are any significant changes in the diameter and the area of the internal jugular vein (IJV) during the hemorrhagic shock. MATERIALS AND METHODS: Healthy volunteers donating blood were included in the study. Arterial blood pressure, pulse rate, anteroposterior (AP) ...
Schumacher Yorck Olaf - - 2012
The increase of the body's capacity to transport oxygen is a prime target for doping athletes in all endurance sports. For this pupose, blood transfusions or erythropoiesis stimulating agents (ESA), such as erythropoietin, NESP, and CERA are used. As direct detection of such manipulations is difficult, biomarkers that are connected ...
Kaufmann Tim A S - - 2012
Understanding circulatory autoregulation is essential for improving physiological control of rotary blood pumps and support conditions during cardiopulmonary bypass (CPB). Cerebral autoregulation (CAR), arguably the most critical, is the body's intrinsic ability to maintain sufficient cerebral blood flow (CBF) despite changes in aortic perfusion pressure. It is therefore imperative to ...
Park Kwon-Hee - - 2012
To assess the efficacy and safety of autologous transfusion of filtered shed blood in total knee arthroplasty (TKA). A total of 42 patients with TKA (group A; without autologous transfusion in 15 patients, group B; with autologous transfusion in 27 patients) were evaluated retrospectively. The influence of autologous reinfusion of ...
Zong Xiaopeng - - 2012
Blood-oxygenation-level-dependent (BOLD) fMRI has contributions from venous oxygenation and venous cerebral blood volume (CBV) changes. To examine the relative contribution of venous CBV change (ΔCBV(v)) to BOLD fMRI, BOLD and arterial CBV changes (ΔCBV(a)) to a 40-s forepaw stimulation in six α-chloralose anesthetized rats were measured using a magnetization transfer-varied ...
Ebihara Nobuyuki - - 2012
Background: To estimate the efficacy and safety of 0.1% tacrolimus ophthalmic suspension based on the blood level of tacrolimus in patients with severe allergic conjunctivitis. Methods: Fifty-two patients in whom topical anti-allergic agents had been ineffective were treated with 0.1% tacrolimus ophthalmic suspension twice daily for 12 weeks. Adverse drug ...
Rengier Fabian - - 2012
Three-dimensional velocity-encoded cine magnetic resonance imaging (3D VEC MRI) allows for calculation of secondary flow parameters that may be used to estimate prognosis of individual cardiovascular diseases. However, its accuracy has not been fully investigated yet. The purpose of this study was to validate aortic flow quantification by 3D VEC ...
Wu Wen-Chih - - 2012
OBJECTIVE:: Blood loss during surgery is an important operative complication in patients undergoing major noncardiac surgery and may increase postoperative morbidity and mortality. Variations in the delivery of operative blood transfusions to treat blood loss depend not only on the patient and surgery characteristics but also on the hospital transfusion ...
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