Search Results
Results 701 - 750 of 2050
< 10 11 12 13 14 15 16 17 18 19 20 >
Kawai Takashi - - 2007
BACKGROUND/AIMS: Transnasal esophagogastroduodenoscopy (EGD) is reported to be more pleasant than conventional transoral EGD. In this study, we compared the hemodynamic effects of transnasal and transoral EGD. METHODOLOGY: The subjects were 120 patients with upper gastrointestinal conditions. Transnasal and transoral EGD were performed on 60 subjects each. Oxygen saturation, heart ...
Jegger David - - 2007
Recently, a new oxygenator (Dideco 903 [D903], Dideco, Mirandola, Italy) has been introduced to the perfusion community, and we set about testing its oxygen transfer performance and then comparing it to two other models. This evaluation was based on the comparison between oxygen transfer slope, gas phase arterial oxygen gradients, ...
Hu C H - - 2007
A systematic investigation is presented of the high-pressure structural stability of Mg(AlH(4))(2) using a plane-wave pseudo-potential method. The total-energy calculations show that under ambient pressure the structure of α-Mg(AlH(4))(2) found by experiments is more stable than the other proposed structures, and with pressure increasing the α to β (δ-Zr(MoO(4))(2)-type structure) ...
Joosten Simon A - - 2007
OBJECTIVE: To elucidate oxygen administration practices in the setting of acute exacerbations of chronic obstructive pulmonary disease (COPD) and compare these practices with those recommended in internationally accepted guidelines. DESIGN: Retrospective audit. PARTICIPANTS AND SETTING: 65 patients admitted to a Melbourne university teaching hospital via the emergency department (ED), identified ...
Wang Shufan - - 2007
PURPOSE: To investigate the effects of hyperoxia on retinal oxygenation and oxygen consumption in the detached feline retina. METHODS: Retinal detachment was created in nine intact anesthetized cats by injecting 0.25% sodium hyaluronate in balanced salt solution into the subretinal space. Oxygen microelectrodes were used to collect spatial profiles of ...
Calvert John W - - 2007
Hyperbaric oxygen (HBO) therapy is defined by the Undersea and Hyperbaric Medical Society (UHMS) as a treatment in which a patient intermittingly breathes 100% oxygen under a pressure that is greater than the pressure at sea level [a pressure greater than 1 atmosphere absolute (ATA)]. HBO has been shown to ...
Windsor Jeremy S - - 2007
In order to compensate for the low partial pressure of oxygen at altitude, the human body undergoes a number of physiological changes. A vital component in this process is the increase in the concentration of circulating haemoglobin. The role of HIF-1alpha, erythropoietin and red blood cells in this acclimatisation process ...
Pham Julius Cuong - - 2007
To clarify the cardiovascular mechanisms of cyanide poisoning by evaluating oxygen transport characteristics using a canine model. A prospective controlled experiment was performed at a hospital-based animal laboratory. Five male beagle (17 (2) kg) dogs were anesthetised with alpha-chloralose, paralysed with pancuronium bromide and mechanically ventilated. Potassium cyanide was infused ...
Palcut Marian - - 2007
Reaction kinetics between dense, polycrystalline pellets of La2O3 and CoO were investigated at temperatures of 1370-1673 K and oxygen partial pressures of 40 Pa - 50 kPa. At high oxygen partial pressures, single phase LaCoO3 was formed. The growth of the LaCoO3 phase followed the parabolic rate law. The location ...
Barker Matthew C - - 2007
Mathematical simulations of oxygen delivery to tissue from capillaries that take into account the particulate nature of blood flow predict the existence of oxygen tension (Po(2)) gradients between erythrocytes (RBCs). As RBCs and plasma alternately pass an observation point, these gradients are manifested as rapid fluctuations in Po(2), also known ...
Evans Melissa C - - 2007
OBJECTIVE: This pilot study tested the potential of puromycin (PUR) to inhibit protein synthesis and reduce oxygen utilization in a non-hibernating, whole animal preparation. METHODS: After anesthesia and instrumentation, male rats received a single dose of PUR or 0.9% saline (control), followed 60 min later with [(35)S] methionine/cysteine radiolabeling. Thirty ...
Li J - - 2007
BACKGROUND: Brain death is associated with profound disturbances of systemic and myocardial oxygen transport, but little is known regarding the acute response of systemic oxygen consumption (VO(2)). METHODS: Brain death was induced in 6 pigs (30.6 +/- 3.0 kg) by balloon inflation into the cranial cavity. VO(2) was continuously measured ...
Pollock Neal W - - 2007
OBJECTIVE: Closed-circuit oxygen rebreathers may provide high concentrations of oxygen at extremely low flow rates appropriate for field use with limited oxygen supplies. The performance of the preproduction, second-generation remote emergency medical oxygen (REMO(2)) system developed for Divers Alert Network was evaluated. METHODS: The unidirectional circuit was made up of ...
Campbell S M - - 2007
This investigation considered a novel method of enhancing penetration of the topical photosensitizing agent methyl aminolevulinate (MAL) into nodular basal cell carcinomas (BCCs) using an oxygen pressure injection device. Oxygen pressure injection (OPI) is a method to drive compounds into skin using pressured oxygen. The study was an observer-blinded pilot ...
Bucci Enrico E Department of Biochemistry and Molecular Biology, University of Maryland Medical School, Baltimore, Maryland, USA. - - 2007
Intramolecular crosslink of hemoglobin tetramers solved the problem of urine elimination and short intravascular retention time of cell free hemoglobin infusion. It also produced a family of crosslinked hemoglobins with P50 between 18 and 30 mmHg. However, it did not solve the problem of MAP increases in infused animals. It ...
Cheney Frederick W - - 2007
Diffusion anoxia. By Bernard Raymond Fink. Anesthesiology 1955; 16:511-14. In 1955, Dr. Bernard Raymond Fink published his findings that described the mechanism by which hypoxemia occurred when nitrous oxide-oxygen anesthesia was discontinued and room air breathing commenced. Using an ear oximeter and brachial artery blood gases, he measured oxygen saturation ...
Moraga Fernando A - - 2007
OBJECTIVE: To determine the prophylactic effect of Ginkgo biloba (doses 80 mg/12 h, 24 h before high-altitude ascension and with continued treatment) in preventing acute mountain sickness (AMS) at 3696 m in participants without high-altitude experience. METHODS: Thirty-six participants who reside at sea level were transported to an altitude of ...
Bradley Timothy J - - 2007
Three respiratory patterns have been described in insects: Discontinuous, Cyclic and Continuous. The Discontinuous Gas Exchange Cycle (DGC) can be distinguished by the presence of an open phase in which the spiracular valves are fully open, a closed phase during which oxygen concentrations at the tissues are lowered, thereby reducing ...
Haranishi Yasunori - - 2007
We compared jugular venous blood oxygen saturation (Sj(O) (2)) and the arterial-to-jugular-bulb venous oxygen content difference (AjD(O) (2)) between bispectral index (BIS) values of 40 and 60, adjusted by the infusion rate of propofol. Eighteen postoperative neurosurgical patients (Glasgow Coma Scale [GCS] scores, 11-15) were enrolled. Normocapnia, normothermia, and a ...
Saito Takaaki - - 2006
Perfluorochemicals (PFCs) have a high solubility for oxygen. We have previously demonstrated the effect of peritoneal lavage with oxygenated PFC (O2-PFC) on ameliorating ischemia/reperfusion (I/R)-induced intestinal ischemic damage in an animal model. In this study, we applied hyperbarically O2-PFC (HBO-PFC) to investigate whether a larger amount of oxygen carried by ...
Atkins James L - - 2007
Oxygen inhalation is recommended for the initial care of trauma victims. The improved survival seen in early hemorrhage is normally associated with an increase in blood pressure. Although clinical use of oxygen can occur late after hemorrhage, the effects of late administration have not been specifically examined. Anesthetized rats were ...
Li Jia - - 2006
OBJECTIVES: The purpose of this study was to evaluate the effects of dopamine on hemodynamic status and oxygen transport in neonates after the Norwood procedure. BACKGROUND: Dopamine is widely used to augment cardiac performance and increase oxygen delivery (DO2) in patients after cardiopulmonary bypass (CPB). This might be at the ...
Welch William J - - 2006
The kidney has a unique environment that results in relatively low tissue oxygen tension (Po2). However, recent studies have shown that renal hypoxia is more severe during hypertension and may reflect changes in the way O2 is used. The present review summarizes studies that explore the relationship between renal oxygen ...
Rugolotto S - - 2006
Endothelin receptor antagonism is an important therapeutic tool of pulmonary arterial hypertension (PAH). Bosentan was the first orally active, dual antagonist of endothelin receptors in human adults, and has been recently considered for children as well. However, little is known about bosentan treatment in children weighing less than 10 kg. ...
España Pedro P - - 2006
RATIONALE: Objective strategies are needed to improve the diagnosis of severe community-acquired pneumonia in the emergency department setting. OBJECTIVES: To develop and validate a clinical prediction rule for identifying patients with severe community-acquired pneumonia, comparing it with other prognostic rules. METHODS: Data collected from clinical information and physical examination of ...
Jellema Wilbert T - - 2006
OBJECTIVE: To establish the heterogeneity of hemodynamic responses to dobutamine in patients with septic shock and to identify the predictive factors of these hemodynamic responses. DESIGN: Prospective study. SETTING AND PATIENTS: A total of 12 patients with septic shock in a tertiary medical intensive care unit. INTERVENTIONS: A 20-min dobutamine ...
Shoemaker William C - - 2006
The aims of this study were to develop and to test a noninvasive hemodynamic monitoring system that could be applied to combat casualties to supplement conventional vital signs, to use an advanced information system to predict outcomes, and to evaluate the relative effectiveness of various therapies with instant feedback information ...
Völker Hans-Ullrich - - 2006
Pressure ulcers are frequently seen dermal lesions, but little is known about their pathophysiology. It is generally assumed that prolonged tissue pressure impairs blood circulation thus causing ischemic damage to tissue. Therefore, subcutaneous oxygen partial pressure was measured to confirm this hypothesis. In the past, various authors have conducted tests ...
Evans R C - - 2006
The color space response of colorimetric luminescent oxygen sensors is described in terms of the Commission Internationale de l'Eclairage (CIE) x,y color coordinates. We show how the color change response to oxygen can be obtained, provided the quenching kinetics for all lumophores involved can be represented mathematically. The theory is ...
Cui Renzhe - - 2006
Sleep-disordered breathing is a risk factor for hypertension, cardiovascular disease and accidents in the general population, but little is known about this correlation among professional truck drivers. To examine the relationships of sleep-disordered breathing with blood pressure levels and excessive daytime sleepiness among truck drivers, we conducted a population-based cross-sectional ...
Lévesque Simon - - 2006
OBJECTIVE: To prospectively compare three methods of apnea testing for the confirmation of brain death. DESIGN: Prospective, randomized, crossover study. SETTING: Intensive care unit of a tertiary care university hospital. PATIENTS: Twenty adult patients requiring apnea testing for confirmation of brain death. INTERVENTIONS: Ten minute apnea testing was repeated in ...
Burnett Louis E - - 2006
Crustacean gills function in gas exchange, ion transport, and immune defense against microbial pathogens. Hemocyte aggregates that form in response to microbial pathogens become trapped in the fine vasculature of the gill, leading to the suggestion by others that respiration and ion regulation might by impaired during the course of ...
Carr Shamus R - - 2006
BACKGROUND: Despite maximal ventilatory support, many patients die from hypoxia in the setting of potentially reversible pulmonary failure. There remains a pressing need for additional pulmonary supportive care measures, especially techniques that do not require systemic anticoagulation. The objective of our experiments was to determine whether systemic oxygenation could be ...
Yogaratnam Jeysen Zivan - - 2006
Over the years, the anecdotal medical use of oxygen has demonstrated, in a non-evidence-based manner, that it may have wide-ranging clinical consequences. Although oxygen is a critical substrate in the alleviation of hypoxia, anoxia, and ischemia, paradoxically, it also functions as a deleterious metabolite during the reperfusion of previously ischemic ...
Stucchi R - - 2006
Oxygen supply to all tissues is possible only in a condition of adequate blood circulation. Oxygen demand is the driving force that is responsive of hemodynamic adjustment. The human body acts on four modulators (intravascular volume, inotropy, vasoactivity, chrono-tropy) in order to adjust the hemodynamic state. Hemodynamic monitoring consists of ...
Tamesue Kiyokazu - - 2006
This study was carried out to determine whether an extracorporeal membrane oxygenation (ECMO) support could be sufficiently conducted by the right ventricle alone from the viewpoint of the hemodynamics and blood gas state. Six infant dogs underwent a bypass between the left pulmonary artery and left atrium with an in-line ...
Bunc Matjaz - - 2006
In CO-poisoned patients without loss of consciousness no significant long-term functional differences in outcome have been shown in any hyperbaric versus normobaric oxygen studies. Since brain histology changes cannot be studied in CO-poisoned patients we evaluated the efficacy of normobaric and hyperbaric oxygen therapy in preventing brain cell injury in ...
Akça O - - 2006
BACKGROUND: Tissue oxygenation is the primary determinant of wound infection risk. Mild hypercapnia markedly improves cutaneous, subcutaneous (s.c.), and muscular tissue oxygenation in volunteers and patients. However, relative contributions of increased cardiac output and peripheral vasodilation to this response remains unknown. We thus tested the hypothesis that increased cardiac output ...
Huang Yubin - - 2006
Poly(ethylene glycol) (PEG) conjugated recombinant human serum albumin (HSA) incorporating the synthetic iron-porphyrin (FeP) [PEGylated albumin-heme, PEG(HSA-FeP)] is a unique albumin-based oxygen carrier as a red blood cell (RBC) substitute. The physiological responses to an exchange transfusion with PEG(HSA-FeP) into an acute anemia rat model were investigated. After a 65% ...
Parker Scott L - - 2006
Reptilian viviparity evolves through selection for increasingly prolonged egg retention within the oviduct. In the majority of sceloporine lizard species, however, egg retention past the normal time of oviposition results in retarded or arrested embryonic development. In this study, we tested the hypothesis that the amount of embryonic development normally ...
Amérand A - - 2006
Eels are submitted to hydrostatic pressure (HP) during their spawning migration (about 6000 Km). Before migration, they change from the yellow to the silver stage (silvering process). The effects of HP in relation to the silvering process have been studied on aerobic metabolism and more precisely on reactive oxygen species ...
Keller B P J A - - 2006
OBJECTIVE: To test whether near infrared spectroscopy (NIRS) is applicable for the examination of the influence of external pressure on oxygenation of the soft tissues in the sacral area. METHOD: Tissue oxygenation was measured in 33 healthy volunteers in the prone position. A NIRS probe was positioned over the sacrum ...
Park J W - - 2006
We present a simple solvent-assisted capillary molding method to fabricate zinc oxide (ZnO) nanostructures using an ultraviolet (UV) curable polyurethane acrylate (PUA) mold. A thin film of the ZnO sol-gel precursor solution in methyl alcohol was prepared by spin coating on a solid substrate and subsequently a nanopatterned PUA mold ...
Li J - - 2006
To evaluate the clinical utility of near-infrared spectroscopic (NIRS) monitoring of cerebral (ScO2) and splanchnic (SsO2) oxygen saturations for estimation of systemic oxygen transport after the Norwood procedure. ScO2 and SsO2 were measured with NIRS cerebral and thoracolumbar probes (in humans). Respiratory mass spectrometry was used to measure systemic oxygen ...
Bradley Timothy J - - 2006
The "oxidative damage model" of proposes that the respiratory system of insects operates in manner that reduces and then regulates the partial pressure of oxygen around the tissues at a very low level. This is achieved through the actions of the discontinuous gas exchange cycle. Resting insects often exhibit a ...
Peyton P J - - 2006
Theoretical modelling predicts that the concentrating effect of nitrous oxide (N2O) uptake on alveolar oxygenation is a persisting phenomenon at typical levels of ventilation - perfusion (V/Q) inhomogeneity under anaesthesia. We sought clinical confirmation of this in 20 anaesthetised patients. Arterial oxygen pressure (P(aO2)) was measured after a minimum of ...
Bein B - - 2006
BACKGROUND AND OBJECTIVE: The present study was designed to compare cerebral oxygenation measured with near infrared spectroscopy and local brain tissue oxygen partial pressure, respectively, in pigs during cardiopulmonary resuscitation. Since tissue overlying the brain may have an impact on near infrared spectroscopy readings, we tested whether optode placement on ...
Felton L A - - 2006
The current study investigated the use of electron paramagnetic resonance (EPR) spectroscopy as a nondestructive method to quantify the partial pressure of oxygen (PO2) in tablets and hard shell capsules. Lithium phthalocyanine crystals (LiPC) were placed inside the dosage forms. The peak-to-peak linewidth of the first derivative of the LiPC ...
Oshima Yu - - 2006
BACKGROUND: Better protective effects of Celsior on cardiac function than the other conventional solutions have been reported in acute experiments and in clinical trials for at-risk patients. However, no study has yet precisely elucidated how these preservation solutions affect cardiac mechanoenergetics. Therefore, we evaluated the effects of St. Thomas' Hospital ...
Ragg Norman L C - - 2006
Extant abalone retain an ancestral system of gas exchange consisting of paired bipectinate gills. This paper examines the hypothesis that fundamental inefficiencies of this arrangement led to the extensive radiation observed in prosobranch gas exchange organs. Oxygen uptake at 15 degrees C was examined in the right gill of resting ...
< 10 11 12 13 14 15 16 17 18 19 20 >