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Pagina 1 a partire dal 3233 risultati
Tumor Acidosis and Hypoxia Differently Modulate the Inflammatory Program: Measurements In Vitro and In Vivo.
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Inflammatory mediators produced by the tumor cells are of importance for immune response but also for malignant progression. The aim of the study was to analyze the expression of monocyte chemoattractant protein-1, interleukin-6 (IL-6), tumor necrosis factor-α, inducible isoform of nitric oxide
Hypoxia-Related Tumor Acidosis Affects MicroRNA Expression Pattern in Prostate and Breast Tumor Cells.
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MicroRNAs (miRNAs) are small non-coding RNA sequences which are able to modulate the expression of many functional proteins. The expression level of miRNAs can be modulated by parameters of the tumor microenvironment like hypoxia, nutrient deprivation or oxidative stress. Since miRNAs can act either
Effect of acidosis on IL-8 and MCP-1 during hypoxia and reoxygenation in human NT2-N neurons.
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Inflammation probably plays a significant role in perinatal brain injury. To study the contribution of locally produced cytokines, the effect on cell death of addition of IL-8 and MCP-1 or antibodies to these, and the impact of acidosis, human postmitotic NT2-N neurons were exposed to 3 h of hypoxia
Basic principles of the foetal heart rate during delivery without hypoxia and acidosis.
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BACKGROUND
Using naked-eye evaluation of foetal heart rate (FHR) patterns remains difficult and is not complete. Computer-aided analysis of the FHR offers the opportunity to analyse the FHR completely and to detect all changes due to hypoxia and acidosis. In order to better understand these changes
Acidosis and tissue hypoxia in the critically ill: how to measure it and what does it mean.
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We routinely monitor blood gases to determine the adequacy of ventilation and the presence of acid-base abnormalities. Changes in the blood are easily assessed, but of more importance is the abnormality at tissue level. Defects in acid-base homoeostasis have major effects on protein function, thus
Maternal insufflation during the second trimester equivalent produces hypercapnia, acidosis, and prolonged hypoxia in fetal sheep.
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BACKGROUND
Anecdotal reports suggest that the second trimester is the safest time to conduct a laparoscopic procedure on a pregnant patient, but this supposition has not been tested empirically.
METHODS
Previously instrumented preterm sheep (total n = 8) at gestational day 90 (term, 145 days) were
Arterial [H+] and the ventilatory response to hypoxia in humans: influence of acetazolamide-induced metabolic acidosis.
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In this study, we investigated possible separate effects of H+ ions and CO2 on hypoxic sensitivity in humans. We also examined whether hypoxic sensitivity, conventionally defined as the ratio of (hypoxic - normoxic) ventilation over (hypoxic - normoxic) Hb oxygen saturation can also be estimated by
Haemodynamic instability during transhiatal resection of oesophagus results in postoperative metabolic acidosis and hypoxia: is there a need for assisted ventilation?
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Oesophagectomy for oesophageal carcinoma is a stressful physical and metabolic challenge for an individual. The metabolic acidosis and hypoxia resulting postoperatively in a 34-year-old male, suffering from oesophageal carcinoma, after transhiatal oesophagectomy was managed without assisted
Effects of changes of blood pressure, respiratory acidosis and hypoxia on blood flow in the sciatic nerve of the rat.
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Using the hydrogen clearance technique, we have measured blood flow in the sciatic nerves of healthy, anaesthetized rats at rest, at various arterial blood pressures, and during respiratory acidosis and hypoxia. The majority of hydrogen clearance curves were bi-exponential. The slower component
Hypoxia with acidosis in extremely preterm born infants was not associated with an increased risk of death or impaired neurodevelopmental outcome at 6.5 years.
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[Effect of smoking on mode of delivery and per partum hypoxia and acidosis].
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METHODS
We conducted a PubMed research using the following key words: fetal, smoking, distress, hypoxia, acidosis, heart rate, cesarean.
RESULTS
The different combinations of key works allowed selection of 251 since 1967. Several article were addressed directly to the question raised; two for
Hypoxia and CCl4-induced liver injury, but not acidosis, impair metabolism of cysteinyl leukotrienes in perfused rat liver.
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Uptake, metabolism and biliary elimination of infused cysteinyl leukotrienes were investigated in single-pass perfused rat liver. Hypoxia did not impair uptake of infused [3H]leukotriene C4, but inhibited biliary excretion of radioactivity by about 50% compared with normoxic control experiments. In
Influence of hypercapnia and (or) hypoxemia and metabolic acidosis on sulfamethazine kinetics in the conscious rabbit.
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The aim of the present study was to determine whether acute changes in blood gases and pH alter sulfamethazine (SMZ) kinetics. Groups of conscious rabbits were exposed for 270 min either to air or to a high CO2 and (or) low O2 atmosphere to produce hypercapnia, hypoxemia, or both. Another group of
[A young child with respiratory acidosis and hypoxia from mechanical ventilation with equipment made for adults].
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BACKGROUND
During mechanical ventilation of young children, problems may arise due to the additional dead space of the ventilation circuit. This may lead to respiratory acidosis and even hypoxia in the child.
METHODS
A 3-month-old boy suffered from frequent apnoea. He was mechanically ventilated for
Effect of supramaximal vagal stimulation in combination with hypoxia, respiratory acidosis and deep halothane anaesthesia on cardiovascular function in dogs.
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Vagal reflexes are generally recognized as a possible cause of cardiac arrest during anaesthesia. Studies were performed to determine whether hypoxia, respiratory acidosis or deep halothane anaesthesia modify the cardiovascular effect of vagal stimulation (VS) in dogs. The animals were anaesthetized
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