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Strana 1 od 391 výsledky
Potentially high-risk cardiac arrhythmias with focal to bilateral tonic-clonic seizures and generalized tonic-clonic seizures are associated with the duration of periictal hypoxemia.
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To investigate potentially high-risk cardiac arrhythmias (PHAs) following focal to bilateral tonic-clonic seizures (FBTCSs) and generalized tonic-clonic seizures (GTCSs) and to study the association of PHAs with seizure characteristics and the severity of associated ictal respiratory
Tonic activation of hypoxia-inducible factor 1alpha in avascular articular cartilage and implications for metabolic homeostasis.
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OBJECTIVE
To determine whether oxygen-dependent activation patterns of hypoxia-inducible factor 1alpha (HIF-1alpha) observed in vascularized tissues are conserved within avascular and hypoxic articular cartilage and whether HIF-1alpha affects cartilage matrix synthesis.
METHODS
Explants of bovine
Hypoxia-Associated Changes in Striatal Tonic Dopamine Release: Real-Time in vivo Measurements With a Novel Voltammetry Technique
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Introduction: Striatal tonic dopamine increases rapidly during global cerebral hypoxia. This phenomenon has previously been studied using microdialysis techniques which have relatively poor spatio-temporal resolution. In this study, we
Peri-ictal hypoxia is related to extent of regional brain volume loss accompanying generalized tonic-clonic seizures
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Objectives: Hypoxia, or abnormally low blood-oxygen levels, often accompanies seizures and may elicit brain structural changes in people with epilepsy which contribute to central processes underlying sudden unexpected death in epilepsy
Acute intermittent hypoxia in rat in vivo elicits a robust increase in tonic sympathetic nerve activity that is independent of respiratory drive.
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Acute intermittent hypoxia (AIH) elicits long-term increases in respiratory and sympathetic outflow (long-term facilitation, LTF). It is still unclear whether sympathetic LTF is totally dependent on changes in respiration, even though respiratory drive modulates sympathetic nerve activity (SNA). In
Work and contraction curves of atrial muscle preparations during anoxia and reoxygenation influenced by cardio-tonic and cardio-depressive drugs.
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Auxotonic work/beat and contraction curves were recorded from left guinea pig atria stimulated with 0.5 Hz at 5 mN preload in K.H.-solution + 15 mmol/l glucose, 95% O2 or N2 + 5% CO2, 30 degrees C. Eight common parameters of the contraction curve were calculated simultaneously in a computerized
Special issue title: "Intermittent hypoxia: Pathologic killer or healing tonic?"
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Chemical anoxia activates ATP-sensitive and blocks Ca(2+)-dependent K(+) channels in rat dorsal vagal neurons in situ.
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The contribution of subclasses of K(+) channels to the response of mammalian neurons to anoxia is not yet clear. We investigated the role of ATP-sensitive (K(ATP)) and Ca(2+)-activated K(+) currents (small conductance, SK, big conductance, BK) in mediating the effects of chemical anoxia by cyanide,
The epileptogenic effect of seizures induced by hypoxia: the role of NMDA and AMPA/KA antagonists.
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Hypoxia of the brain may alter further seizure susceptibility in a different way. In this study, we tried to answer the question how episode of convulsion induced by hypoxia (HS) changes further seizure susceptibility, and how N-methyl-D-aspartic acid (NMDA) and AMPA/KA receptor antagonists
[Effects of volatile anesthetics on the cervical sympathetic nerve activity during acute hypoxemia or hypercarbia in dogs].
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Either hypoxemia or hypercarbia produces a significant change in the autonomic nervous system activity. Responses of the cervical sympathetic nerve activity (CSA) to acute hypoxemia and/or hypercarbia were studied in the absence and the presence of either halothane (H), enflurane (E), isoflurane (I)
Sympatho-excitatory neurons of the rostral ventrolateral medulla are oxygen sensors and essential elements in the tonic and reflex control of the systemic and cerebral circulations.
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MEDULLARY ROSTRAL VENTROLATERAL RETICULAR NUCLEUS (RVL): Reticulospinal neurons are critical to control of the circulation by the brain. Its actions are implemented by a few reticulospinal neurons, 200 in the rat. These directly innervate and excite preganglionic sympathetic neurons of the spinal
The effects of hypercapnia and hypoxia on single hypoglossal nerve fiber activity.
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The respiratory related modulation of hypoglossal nerve activity has been studied at the single fiber level in cats under hyperoxic hypercapnia and hypoxic conditions and their conduction velocities determined. Changes in fiber activity were compared to simultaneous changes occurring in phrenic
The role of the renin-angiotensin system in the renal response to moderate hypoxia in the rat.
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1. In two groups of Saffan-anaesthetized rats, we studied the role of the renin-angiotensin system in mediating the antidiuresis and antinatriuresis induced by moderate systemic hypoxia. 2. In both groups, a first period of hypoxia (breathing 12% O2 for 20 min) induced a fall in arterial partial
A 49-Year-Old Woman With Chest Pain, Cough, and Hypoxemia After a Seizure.
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A 49-year-old woman with a medical history of epilepsy presented to the ED 1 h after a single, 15-min, witnessed, tonic-clonic seizure. Over the preceding 6 months, she had experienced five similar seizures of shorter duration. There were no recent changes to her phenytoin dose nor had she started
Inhibitory effects of NMDA receptor antagonists on hypoxia-induced seizures in dietary Mg(2+)-deficient mice.
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The effects of the non-competitive N-methyl-D-aspartate (NMDA) antagonists, (+)-MK-801 hydrogen maleate (MK-801) and phencyclidine hydrochloride (PCP), were tested against hypoxia-induced tonic convulsions and hippocampal epileptiform discharges. Systemic administration of MK-801 and PCP suppressed
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