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At least 469 records · Page 26Linked to original sources
PubMed1986

Site of action of torasemide in man.

The effect of torasemide, a new orally and parenterally active diuretic agent, on the renal mechanisms of dilution and concentration was studied in 6 healthy volunteers. The experimental conditions included water and osmotic diuresis. Torasemide caused maximal chloruresis and natriuresis during the 20-40 min after administration. The effect was more pronounced under osmotic diuresis and persisted throughout the 100 min of those experiments. A distinct effect both on free water clearance (CLH2O) during water diuresis and tubular reabsorption of solute free water (TcH2O) during osmotic diuresis strongly suggests that the major site of action of torasemide is the ascending limb of the loop of Henle. Comparison with furosemide under osmotic diuresis indicates longer abolition of TcH2O/GFR by torasemide in keeping with the fact that its half-life is 2- to 3-times longer than that of furosemide.

Adult↗
PubMed1996

Bioavailability and diuretic effect of furosemide following administration of tablets and retarded capsules to human subjects.

Two kinds of dosage forms (tablets and retarded capsules) of furosemide (F) were compared in vitro dissolution profile and in vivo absorption studies. The dissolution of F from retarded capsules was extremely restricted in the first fluid of the JP XII disintegration test (within 0.8%), while the dissolution of F from tablets and retarded capsules in the second fluid of JP XII disintegration test were both complete. Metabolite specific assay of F showed F, conjugation of F with glucuronic acid (FG) and acyl migration isomers of FG (FG-iso) in urine or plasma. The mean cumulative urinary excretion of F following administration of the tablets during 24 h was twice that of retarded capsules. The mean area under the plasma concentration-time curve (AUC) of F following administration of tablets was 1.5 times that of retarded capsules. The mean cumulative urine volume during 24 h, however, was not significantly different between the two dosage forms. Clockwise hysteresis relationships between the diuretic response and the urinary excretion rate of F was observed after administration of retarded capsules. A straight relation between logarithm of the diuresis and logarithm of the urinary excretion of F was observed after maximum excretion rate of F following administration of both dosage forms.

Absorption↗
PubMedDate not supplied

Hemodynamic derangement and cardiac dysfunction in cirrhosis.

Liver cirrhosis is characterized by a long course that lasts between 15 and 20 years. The natural history of this disease depends mainly on the occurrence and progression of single complications which are today more fully understood and therefore more treatable. More specifically, those complications involving hemodynamic mechanisms have been extensively studied in recent years. Indeed, the mechanisms involved in the occurrence of sodium positive balance and ascites, with or without renal dysfunction, have been clarified. It is now possible to distinguish between two different stages in the presence of hemodynamic modifications. In the first stage, an increasing accumulation of water and sodium may occur, leading to an increase in total plasma flow. Subsequently, there is a period of vascular instability and finally, the progressive appearance of typical signs of hyperdynamic circulation. During the second stage, cardiac function may be modified and consequently profoundly altered. The early administration of diuretics (antialdosteronics) seems to be capable of modifying cardiac dysfunction, leading to a return towards a physiological status through a rapid increase in diuresis and natriuresis and a decrease in plasma volume.

Animals↗
PubMed1992

Diuretic activity of organomercury (II) complexes of theophylline and theobromine.

Organomercury(II) complexes of the types, p-XC6H4HgL (A) and p-XC6H4HgCl(L') (B) [LH = theophylline; L' = theobromine; X = Me, NO2], have been synthesised and characterized. Conductance measurements indicate that the complexes are non-electrolytes. The structures of the complexes have been elucidated by spectral studies (IR, UV, and 1H, 13C NMR). The complexes have been tested for diuretic activity. The structure-activity relationship has been propounded.

Animals↗
PubMed1976

Effect of single dose of diuretics on renal magnesium excretion in man, with special reference to their site of action.

The administration of a single dose of furosemide, ethacrynic acid and polythiazide to healthy individuals under conditions of maximum water diuresis produces a significant increase in renal magnesium excretion. Elevated Mg excretion displayed a direct correlation to renal sodium excretion after furosemide (r=0.689, p less than 0.001), ethacrynic acid (r=0.869, p less than 0.001) and polythiazide (r=0.586, p less than 0.01). The slopes of the various regression lines did not differe significantly from each other or from the slope of the regression line characterizing this correlation for mannitol (r= 0.603, p less than 0.01). A significant linear correlation was likewise found between the excretion of Mg and total osmotically active substances after furosemide (r=0.783, p less than 0.001), ethacrynic acid (r=0.88, p less than 0.001) and polythiazide (r=0.646, p less than 0.01). The regression lines of the given correlations did not differ significantlyfrom each other, but their slopes were significantly higher than that of the regression line for the correlation after mannitol (r=0.454, p less than 0.01). The findings indicate that tubular Mg transport is influenced both by a decrease in tubular Na resorption in the diluting segment (polythiazide) and by an effect on Na resorption in the parts of the nephron proximal to the diluting segment of the nephron (furosemide, ethacrynic acid).

Adult↗