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Oxygen-radical-mediated permeability edema and vasoconstriction in isolated perfused rabbit lungs.

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Oxygen radicals have been implicated in the pathogenesis of permeability pulmonary edema. To determine directly if O2 radicals can cause increased alveolar-capillary membrane (ACM) permeability and low-pressure permeability edema, we chemically produced O2 radicals in the sale perfusates of isolated

IL-2 induces pulmonary edema and vasoconstriction independent of circulating lymphocytes.

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We investigated the effect of IL-2 in the isolated guinea pig lung perfused with phosphate-buffered Ringer's solution (containing 0.5 g/100 ml albumin and 5.5 mM dextrose) to determine the mechanism of IL-2-induced pulmonary edema. IL-2 (0 to 10,000 U/ml) was added to the perfusate following a 10

Pulmonary microvascular and perivascular interstitial geometry during development of mild hydraulic edema.

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To study pulmonary arteriolar vasomotion in control conditions and in the transition to hydraulic edema, changes in subpleural pulmonary arteriolar diameter and perivascular interstitial volume were evaluated in anesthetized spontaneously breathing rabbits. Images of subpleural pulmonary

Intraarterial infusion of high-concentration papaverine damages cerebral arteries in rats.

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OBJECTIVE To determine the appropriate concentration of papaverine for therapeutic intraarterial infusion against cerebral vasospasm. METHODS We investigated histopathologic changes in cerebral arteries and brain tissue of normal Wistar rats that had received infusions of papaverine via the carotid

The use of intraarterial papaverine in the management of vasospasm complicating arteriovenous malformation resection. Report of two cases.

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The authors report two cases of treatment by intraarterial papaverine of cerebral vasospasm complicating the resection of an arteriovenous malformation (AVM). Both cases had successful reversal of vasospasm documented on angiography. In the first case sustained neurological improvement occurred,

'Distensibility' of the papaverine-relaxed vascular bed in human subcutaneous tissue.

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The effect of an increase in vascular transmural pressure upon the blood flow in two subcutaneous vascular beds, maximally dilated by papaverine was studied in 6 healthy humans. Blood flow was measured on the dorsum of the hand and at the lateral malleolus by the local 133Xe washout technique.

Protein kinase inhibitor prevents pulmonary edema in response to H2O2.

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We investigated the effect of H2O2 (92 microM) in isolated guinea pig lungs perfused with a buffered Ringer solution. Pulmonary arterial pressure (Ppa), pulmonary capillary pressure (Ppc), and change in lung weight (delta W) were recorded at 0 min and at 15, 30, and 60 min after the H2O2. The

Activation of rho is involved in the mechanism of hydrogen-peroxide-induced lung edema in isolated perfused rabbit lung.

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Acute lung injury is attributed primarily to increased vascular permeability caused by reactive oxygen species derived from neutrophils, such as hydrogen peroxide (H2O2). Increased permeability is accompanied by the contraction and cytoskeleton reorganization of endothelial cells, resulting in

Effect of edema on segmental vascular resistance in isolated lamb lungs determined by micropuncture.

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We have studied the mechanical effects of fluid accumulation on the pulmonary vasculature in 28 isolated blood perfused lungs of newborn lambs. Vascular resistance in the pulmonary arteries, microvessels, and veins was determined by micropuncture measurement of microvascular pressures, and regional

Effect of edema on segmental vascular resistance in isolated perfused rat lungs.

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We have determined the effect of hydrostatic edema on total and segmental vascular resistances in the rat lung. Lungs of 12 adult rats, body weight 515 +/- 42 g, were isolated and perfused with blood. To investigate the role of vasoactivity on edema effects, we studied two groups of lungs; group I

Role of neuropeptides in acetylcholine-induced edema in isolated and perfused rabbit lungs.

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Changes in pulmonary endothelial permeability and in microvascular hemodynamics in response to cumulative concentrations of acetylcholine (ACh) (10(-8) M to 10(-5) M) were investigated in isolated, perfused rabbit lungs. The total pressure gradient was partitioned into four components: arterial,

PAF potentiates protamine-induced lung edema: role of pulmonary venoconstriction.

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We studied the synergistic interaction between platelet-activating factor (PAF) and protamine sulfate, a cationic protein that causes pulmonary endothelial injury, in isolated rat lungs perfused with a physiological salt solution. A low dose of protamine (50 micrograms/ml) increased pulmonary artery

[Vasoconstriction is required for edema of contralateral lung after reperfusion injury of one lung].

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Ischemia-reperfusion (IR) lung injury is a significant cause of morbidity and mortality in certain clinical scenarios that include transplantation, thromboendarterectomy and reexpansion injury of the lung. Edema of the contralateral lung after IR injury of one lung has been reported and this study

Importance of vasoconstriction in lipid mediator-induced pulmonary edema.

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Lipid mediators of inflammation cause pulmonary edema, yet it is unclear to what degree hemodynamic alterations or increased vascular permeability contribute to lung edema formation. The isolated rat lung preparation was used to examine the effect of leukotriene C4 (LTC4) and platelet-activating

Human platelets modulate edema formation in isolated rabbit lungs.

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The role of platelet glucose-6-phosphate dehydrogenase (G-6-PD) in mediating the effects of human platelets on oxidant-induced edema in the isolated perfused rabbit lung was investigated using dehydroepiandrosterone, a specific steroidal inhibitor of G-6-PD. Xanthine oxidase (0.003 and 0.012 U/ml)

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