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Pàgina 1 des de 33 resultats
Enhancement of oxidative cell injury and antitumor effects of localized 44 degrees C hyperthermia upon combination with respiratory hyperoxia and xanthine oxidase.
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The effects of respiratory hyperoxia (RH) and xanthine oxidase (XO) during localized hyperthermia (HT) were investigated by determining markers of oxidative damage to lipids and proteins and tumor growth. Anesthetized rats with s.c. DS-sarcomas underwent one of the following treatments: (a)
[Characteristics of body reactions of mine rescue workers to the combined effects of hyperthermia and hyperoxia].
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Hyperoxia management during deep hypothermia for cerebral protection in circulatory arrest rabbit model.
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As a brain protection strategy, antegrade selective cerebral perfusion (ASCP) is widely used in thoracic aorta surgery with deep hypothermic circulatory arrest (DHCA), yet the oxygen management for ASCP has never been standardized. The aim of this study was to investigate the possible
Hyperoxia increases paradoxical sleep rhythm in the pontine cat.
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Pontine cat is an ectothermic preparation, whose central temperature can artificially be lowered from 36 degrees C to 26 degrees C; this gradual hypothermia is accompanied by a dramatic increase in paradoxical sleep (PS). Two main hypotheses might explain this result: executive systems of PS might
The influence of blood gas changes on hyperthermia-induced seizures in developing rats.
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Fever induces seizures in infants with febrile convulsions or epilepsy. Hyperpnea induced by fever may contribute to the induction of these seizures. In order to examine this possibility, we evaluated the effect of changes in arterial blood gas tension on hyperthermia-induced seizures in developing
Influence of hyperoxia on skin vasomotor control in normothermic and heat-stressed humans.
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Hyperoxia induces skin vasoconstriction in humans, but the mechanism is still unclear. In the present study we examined whether the vasoconstrictor response to hyperoxia is through activated adrenergic function (protocol 1) or through inhibitory effects on nitric oxide synthase (NOS) and/or
Febrile-range hyperthermia augments pulmonary neutrophil recruitment and amplifies pulmonary oxygen toxicity.
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Febrile-range hyperthermia (FRH) improves survival in experimental infections by accelerating pathogen clearance, but may also increase collateral tissue injury. We hypothesized that FRH would worsen the outcome of inflammation stimulated by a non-replicating agonist and tested this hypothesis in a
Carotid chemoreceptors have a limited role in mediating the hyperthermia-induced hyperventilation in exercising humans.
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Hyperthermia causes hyperventilation at rest and during exercise. We previously reported that carotid chemoreceptors partly contribute to the hyperthermia-induced hyperventilation at rest. However, given that a hyperthermia-induced hyperventilation markedly differs between rest and exercise, the
Hyperthermia is more important than hypoxia as a cause of disrupted spermatogenesis and abnormal sperm.
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We tested the hypothesis that hypoxia replicates effects of hyperthermia on reducing number and quality of sperm produced, whereas hyperoxia mitigates effects of hyperthermia. Forty-eight CD-1 mice (∼50 d old), inspired air with 13, 21, or 95% O2 and were exposed to ambient temperatures
Early-Stage Hyperoxia Is Associated with Favorable Neurological Outcomes and Survival after Severe Traumatic Brain Injury: A Post-Hoc Analysis of the Brain Hypothermia Study.
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The effects of hyperoxia on the neurological outcomes of patients with severe traumatic brain injury (TBI) are still controversial. We examined whether the partial pressure of arterial oxygen (PaO2) and hyperoxia were associated with neurological outcomes and survival by conducting post-hoc analyses
[Effect of hypoxia and hyperthermia on the processes of lipid peroxidation in the rat liver against a background of the action of gutimine and unsaturated amines].
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Following the action of extraordinary stimulants (hypoxic hypoxia, hypoxia+hyperoxia, hypodynamia+hyperthermy) animals demonstrate accumulation of malonic dialdehyde with a simultaneous fall of antiradical activity of the liver tissue. A preliminary introduction to rats of acetylene amines--1,4 bis
Chemoreceptor control of heart rate and behaviour during diving in the tufted duck (Aythya fuligula).
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1. The role of chemoreceptors in the control of heart rate and behaviour during diving activity in the tufted duck was investigated in two ways. In a closed-loop experiment, ducks were exposed to ambient gas mixtures of varied composition during diving activity in an indoor tank. Characteristics of
Deep hypothermia and rewarming alters glutamate levels and glycogen content in cultured astrocytes.
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BACKGROUND
Deep hypothermia has been associated with an increased incidence of postoperative neurologic dysfunction after cardiac surgery in children. Recent studies suggest an excitotoxic mechanism involving overstimulation of glutamate receptors. Extracellular glutamate uptake occurs primarily by
A new paradigm regarding testicular thermoregulation in ruminants?
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Increased testicular temperature reduces percentages of morphologically normal and motile sperm and fertility. Specific sperm defects appear at consistent intervals after testicular hyperthermia, with degree and duration of changes related to intensity and duration of the thermal insult. Regarding
[Effect of microwave radiation on regional blood flow and tissue oxygenation in the brain].
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The effect of irradiation of the central nervous system by microwaves (MW) at a frequency of 2450 MHz and power 5-40 W on the regulation of cerebral circulation and oxygen supply to the nervous tissue were studied in rabbits. Local irradiation of the exposed cerebral cortex resulted in hyperemia and
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