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(See Beyer et al, 1965 Post Date: Wed, 15 Oct 2008 3:11:35 +0000 The rates of excretion are of such a magnitude that cumulation does not occur despite repeated adminis-tration. With oral ingestion, a diuretic re-sponse may be anticipated within an hour; with intravenous injection, within 2 to 10 minutes. (See Beyer et al, 1965; Gayer, 1965; 0stergaard et al, 1972,)Ethacrynic acid is bound to plasma pro-tein. Autor of the post: Undefined Ethacrynic acid is secreted Post Date: Wed, 15 Oct 2008 3:00:25 +0000 After intravenous injection, about one third of the dose is excreted by the liver and about two thirds by the kidney. The drug recovered from the urine is about equally divided into three fractions: the parent com-pound, a cysteine adduct, and an unstable metabolite of undetermined nature (Beyer et al, 1965). Ethacrynic acid is secreted by the organic-acid secretory mechanism of the proximal tubule. Autor of the post: Undefined Furosemide is strongly bound to plasma Post Date: Wed, 15 Oct 2008 2:41:48 +0000 The net rate of urinary se-cretion is also dependent on urinary pH. Thus, ethacrynic acid probably normally undergoes substantial back diffusion.Furosemide is strongly bound to plasma proteins. Autor of the post: Undefined A small fraction is metabolized Post Date: Wed, 15 Oct 2008 2:28:53 +0000 Although urinary excretion is ac-complished both by glomerular filtration and proximal tubular secretion, together this ac-counts for roughly only two thirds of the ingested dose. The remainder is excreted in the feces. A small fraction is metabolized byGFR (ml/min)cleavage of the side chain (Beyer et al, 1965; Gayer, 1965). Autor of the post: Undefined While the drug is largely Post Date: Wed, 15 Oct 2008 2:09:40 +0000 An additional product, possibly a glucuronide conjugate, has also been found.Bumetanide is strongly bound to plasma proteins. While the drug is largely excreted in the urine, in the nephrectomized animal the plasma concentration declines at an appreciable rate. Autor of the post: Undefined In general, the time Post Date: Wed, 15 Oct 2008 1:57:33 +0000 No metabolites have been detected in the dog (0stergaard et al, 1972).Mechanism of Diuretic Action. In general, the time of onset and duration of diuresis with the agents in this class are shorter than with other classes of diuretics, such as mercurials or thiazides, but this depends to a considerable extent on concomitant changes in fluid balance. Autor of the post: Undefined This site has been localized Post Date: Wed, 15 Oct 2008 1:42:20 +0000 The duration of action varies with the particular renal function being measured (Figure 39-1).The high-ceiling diuretics act primarily to inhibit sodium and chloride reabsorption in the ascending limb of the loop of Henle. This site has been localized as a result of the virtually complete inhibition of both positive and negative free-water production, and by micropuncture technics (see Edwards et al, 1973; Goldberg, 1973; Suki et al, 1973). Autor of the post: Undefined Inhibition of electrolyte reabsorption Post Date: Wed, 15 Oct 2008 1:25:56 +0000 In the isolated tubule, ethacrynic acid acts on the ascending limb to block the active re-absorption of chloride (Burg and Green, 1973c). The magnitude of peak electrolyte excretion is given in Tables 39-1 and 39-2, Unlike that which occurs with the organic mercurials and the inhibitors of carbonic anhydrase, the diuretic response is largely independent of acid-base balance. Inhibition of electrolyte reabsorption has also been observed in the proximal tubule (Morgan et al, 1970). Autor of the post: Undefined Actions on the distal tubule Post Date: Wed, 15 Oct 2008 1:09:32 +0000 Indeed, the magnitude of the inhibition of tubular reabsorption can be ex-plained only by multiple sites of action. The effect at the proximal site of action has been studied by micropuncture experiments, but it is uncertain to what extent this contributes to the diuresis observed in vivo. Actions on the distal tubule and collecting duct are controversial and of a minor degree. Autor of the post: Undefined Note the gradual reduction Post Date: Wed, 15 Oct 2008 0:54:28 +0000 Ethacrynic acid does not inhibit carbonic anhydrase in vitro and does not augment bicarbonate excretion (Beyer et al, 1965). Since furosemide and bumetanide have un-substituted sulfonamide side chains, they might be expected to inhibit carbonic an-Observations were made in an anesthetized dog, infused with vasopressin and without vol-ume replacement. Note the gradual reduction in glomerular filtration rate (GFR), which is probably the result of volume depletion. 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