Colloid Osmotic Pressure
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. Physical properties of isolated perfused renal tubules and tubular basement membranes
To study the physical properties of renal tubular basement membranes directly, the epithelial layer of single isolated perfused rabbit proximal convoluted, proximal straight, and cortical collecting tubules was removed with sodium desoxycholate. Tubular segments were perfused using micropipets. The distal end of each segment was occluded in order to simplify
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14. Quantitative Importance of Changes in Postglomerular Colloid Osmotic Pressure in Mediating Glomerulotubular Balance in the Rat
In recent studies in this laboratory employing normal hydropenic rats we have demonstrated that the reduction in absolute proximal reabsorption that attends the experimental reduction of single nephron glomerular filtration rate (SNGFR) (glomerulotubular balance) is mediated, at least in part, by the accompanying decline in postglomerular vascular protein co
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15. Pressure Control of Sodium Reabsorption and Intercellular Backflux across Proximal Kidney Tubule
The magnitude of changes in luminal hydrostatic pressure (ΔPL), peritubular capillary hydrostatic pressure (ΔPPT), and peritubular capillary colloid osmotic pressure (Δπ) was determined in the Necturus kidney during volume expansion (VE). The specific effects of separate changes of each pressure parameter on proximal net sodium transport (JNa) were studi
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16. Effect of osmolarity of artificial tear drops on relief of dry eye symptoms: BJ6 and beyond.
Patients with clinically well defined keratoconjunctivitis sicca (KCS) participated in two trials of hypo-osmolar tear substitutes. The trials were double masked, single crossover studies with computer generated random order allocation and were conducted by postal questionnaire. In the first trial a hypo-osmolar formulation using polyvinylpyrrolidone and hyd
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17. Mechanism of production of intestinal secretion by elevated venous pressure.
A study was carried out to elucidate the physiological mechanisms responsible for the intestinal secretion produced by venous pressure elevation. In dogs, measurements were made of the rate and composition of small intestinal secretion, rate of flow and composition of intestinal lymph, plasma composition, and mucosal water content, all in response to elevati
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18. The effect of passive tilting on microvascular parameters in the human calf: a strain gauge plethysmography study.
1. Cumulative small steps in venous congestion pressure were used to study the effect of passive tilt on vascular parameters in dependent tissues. Using this protocol we have non-invasively assessed venous pressure (Pv,est), isovolumetric cuff pressure (Pv,i), which is the congestion cuff pressure (Pcuff) that has to be exceeded to induce fluid filtration. W
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19. Effect of furosemide in canine low-pressure pulmonary edema.
We studied the effect of furosemide on pulmonary oxygen exchange, lung liquid, and central hemodynamics in dogs with pulmonary capillary leak induced by intravenous oleic acid (OA). 2 h after OA, triple indicator-dilution lung liquid volume and pulmonary shunt (Qs/Qt) doubled despite normal pulmonary capillary wedge pressure in 16 dogs compared with dogs not
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20. Glomerular hemodynamics in established glycerol-induced acute renal failure in the rat.
The glomerular dynamic correlates of failed filtration were studied in volume replete rats with established glycerol-induced acute renal failure (ARF). Over one-half of all nephrons formed virtually no filtrate, while the single nephron glomerular filtration rate (SNGFR) of fluid-filled nephrons, measured at the glomerulotubular junction to preclude the poss
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21. Barrier effects of hyperosmolar signaling in microvascular endothelium of rat lung.
We determined the effects of hyperosmolarity on lung microvascular barrier properties by means of the split-drop technique in single venular capillaries of the isolated, blood-perfused rat lung. Using isosmolar and hyperosmolar test solutions (colloid osmotic pressure = 21 cm H2O), we quantified transcapillary flux at a fixed absorptive capillary pressure, a
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22. Sequential changes in circulating total protein and albumin masses after abdominal vascular surgery.
Sequential changes in total circulating protein (TCP) and total circulating albumin (TCA) masses after different blood replacement regimens were investigated in a prospective study involving 40 patients undergoing reconstructive abdominal aortic surgery. Group I (13 patients) had 80 gm of albumin during operation and 60 gm of albumin during the following 3 d
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23. Starling pressures in the human arm and their alteration in postmastectomy oedema.
1. Surgery and radiotherapy to axillary lymph nodes during breast cancer treatment is often followed, commonly years later, by chronic postmastectomy oedema (PMO). PMO is considered a 'high protein' oedema due to reduced axillary lymph drainage. Since oedema formation also depends on fluid input (capillary filtration), we studied the Starling pressures in th
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24. Relationship between venous pressure and tissue volume during venous congestion plethysmography in man.
1. Venous congestion strain-gauge plethysmography enables the non-invasive assessment of arterial blood flow, fluid filtration capacity (Kf), venous pressure (Pv) and isovolumetric venous pressure (Pvi) in man. One of the major assumptions of this technique, that cuff pressure (Pcuff) applied to the limb equals Pv at the level of the strain gauge, was tested