theophylline/hypoxia

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Theophylline does not increase ventilatory responses to hypercapnia or hypoxia.

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Theophylline is commonly believed to stimulate central respiratory centers. We studied the effect of oral theophylline therapy on ventilatory responses to hypercapnia and hypoxia during a double-blind placebo-controlled trial with a slow release oral theophylline preparation. We measured hypercapnic

Theophylline clearance in patients with severe chronic obstructive pulmonary disease receiving supplemental oxygen and the effect of acute hypoxemia.

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The effect of hypoxemia on the disposition of theophylline was examined in 10 stable patients with chronic obstructive pulmonary disease (COPD) receiving chronic theophylline and supplemental home oxygen therapy. Pharmacokinetics after intravenous theophylline were estimated on the second day of

The novel combination of theophylline and bambuterol as a potential treatment of hypoxemia in humans.

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Hypoxemia can be life-threatening, both acutely and chronically. Because hypoxemia causes vascular dysregulation that further restricts oxygen availability to tissue, it can be pharmacologically addressed. We hypothesized that theophylline can be safely combined with the β2-adrenergic vasodilator

Combined methazolamide and theophylline improves oxygen saturation but not exercise performance or altitude illness in acute hypobaric hypoxia.

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What is the central question of this study? Does the combination of methazolamide and theophylline reduce symptoms of acute mountain sickness (AMS) and improve aerobic performance in acute hypobaric hypoxia? What is the main finding and its importance? The oral combination of

[Pharmacokinetic examination of theophylline in pregnancy in cases of fetal anoxia].

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The purpose of the investigation was to determine the effects of pregnancy on theophylline pharmacokinetics and to clarify the clinical effect of theophylline treatment in cases of threatened anoxemia of foetus. The study was carried out in 15 pregnant women between 28 and 32 weeks of pregnancy with

Theophylline disposition in patients with COLD with and without hypoxemia.

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This study aimed to assess the effect of hypoxemia on theophylline disposition. Ten patients with a mean (+/- SEM) of 58 +/- 3 years with COLD (PaO2 55 +/- 1 mm Hg, PaCO2 46 +/- 2 mm Hg, and pH of 7.39 +/- 0.01) were hospitalized to have oxygen therapy. Before starting O2, they received

Blood oxygen tension-related change of theophylline clearance in experimental hypoxemia.

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The effects of arterial blood oxygen tension on the pharmacokinetics of theophylline were investigated using an experimental acute hypoxemia model in rats. Conscious rats were exposed to hypoxic gas composed of 8% O2-92% N2. After blood gas tensions and blood pH were stabilized, rats received 5

Influence of hypercapnia and/or hypoxemia and metabolic acidosis on theophylline kinetics in the conscious rabbit.

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This study investigated the effect of acute changes in blood gases and pH on theophylline kinetics. Groups of 6 conscious rabbits were exposed to air (control) or to a high CO2 and/or low O2 atmosphere for 570 minutes, or received 47 ml/kg of 0.3N HCl by gavage. Once blood gases or pH were

Hypoxia-specific inhibition of recovery from radiation damage by a novel 2-nitroimidazole with a theophylline side chain.

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A novel 2-nitroimidazole with a theophylline side-chain, 7-(4'-(2-nitroimidazol-1-yl)-butyl)-theophylline, (NITP) was as efficient a hypoxic-cell radiosensitizer as misonidazole. However, if cells were irradiated with NITP under hypoxic conditions and then exposed to the drug under aerobic

Role of adenosine in regulation of cerebral blood flow: effects of theophylline during normoxia and hypoxia.

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We studied the effects of the methylxanthine theophylline, an adenosine receptor blocker, on cerebral circulation. Cerebral blood flow (CBF) was measured by the retroglenoid outflow and microsphere techniques, and pial circulation changes were observed through a closed cranial window.

Effect of theophylline on metabolic and ventilatory response to hypoxemia during quiet sleep in piglets.

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Theophylline, a drug frequently used in newborns, stimulates respiration and increases the metabolic rate in a sustained fashion; hypoxemia, on the other hand, decreases metabolic rate and increases ventilation slightly and, at times, only transiently. This study looked at the effect of theophylline

Theophylline prevents the hypoxemia-induced renal hemodynamic changes in rabbits.

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The acute renal effects of hypoxemia and the ability of theophylline to prevent these effects were assessed in anesthetized and mechanically-ventilated newborn and adult rabbits. Renal blood flow (RBF) and glomerular filtration rate (GFR) were determined by the clearance of para-aminohippuric acid

Hypoxia, arterial pH and theophylline disposition.

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Theophylline is a bronchodilator used extensively in the management of obstructive pulmonary disease. Factors implicated in altered theophylline clearance include smoking, age, concomitant drug intake, liver disease and left ventricular heart failure. However, evidence now suggests that theophylline

Moderate hypoxia: reactivity of pial arteries and local effect of theophylline.

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The reactivity of pial arteries to the perivascular microapplication of artificial cerebrospinal fluids with mounting concentrations of adenosine (10(-11)-10(-3) M), K+ (0-10 mM), and H+ (pH 5.1-7.6) was determined in chloralose-anesthetized ventilated cats during normoxic control conditions and

Effect of theophylline on ventilatory roll-off during hypoxia in goats.

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The increase in pulmonary ventilation (VE) during the first minutes of hypoxia is not sustained as after several minutes VE decreases or "rolls-off" toward control levels. We hypothesized that intravenous infusion of theophylline, by blocking the central inhibitory effects on breathing of adenosine,

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