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Query: UMLS:C0022672 (acute tubular necrosis)
 2,175 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Five episodes of acute renal failure due to rifampicin (R-ARF) were observed in four patients and the clinical and histological data were compared with the records of 52 episodes reported in the literature. The bulk of data supports the assumption that the by far most frequent renal injury responsible for R-ARF is acute tubular necrosis produced by a vasomotor mechanism. Nevertheless a few data, above all immunohistological findings, suggest the local presence of allergic process. It may be, that the development of an immunological renal lesion is prevented or blunted by the consequences of vasomotor effects.
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PMID:Acute renal failure due to rifampicin (R-ARF). 93 13

Renal tubular function was evaluated in vitro by kidney slice uptakes of p-aminohippurate (PAH) and tetraethylammonium (TEA) at 24 and 48 h in water-drinking rats and at 24 h in chronic saline-loaded rats after induction of acute tubular necrosis (ATN) by HgCl2 and glycerol injection. Significant correlations between decrease tubular uptake of PAH and TEA and elevated serum creatinine levels were noted in both models of ATN in water- and saline-drinking rats. However, with the same degree of impairment of PAH and TEA uptakes the creatinine was significantly lower in saline-loaded rats than in water-drinking rats in both forms of ATN. The correlation between impaired tubular function and elevated creatinine suggests that tubular damage and glomerular filtration reduction might be pathophysiologically related in ATN.
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PMID:The role of tubular necrosis in the pathophysiology of acute renal failure. 94 Jun 26

The renal biopsy findings in a 76 yr-old woman suffering grom anuria due to acute tubular necrosis are described. The glomeruli were normal on light- and electron microscopy. Immunofluorescent studies failed to reveal any fibrin or immunoglobulins in the glomerular capillaries. Extensive focal areas of necrosis were seen in the tubular epithelium often exposing the lumen of the tubule directly to the tubular basement-membrane. In some areas necrotic cells lay adjacent to normal or near normal cells. The proximity of the necrotic tubular epithelium to the oedematous interstitial tissue and the peritubular capillaries, together with the finding of normal glomeruli is compatible with the theory of back diffusion as a mechanism for the oliguria.
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PMID:Renal tubular necrosis due to shock: light and electron-microscope observations. 94 90

The FENa test, a determination of the excreted fraction of the filtered sodium, was performed in patients in the oliguric phase of acute renal failure. Patients with prerenal azotemia had an FENa of less than 1, and patients with acute tubular necrosis had an FENa of more than 3 (P less than .001). This simple test clearly differentiates between these two conditions and, thus, is of considerable clinical value.
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PMID:The FENa test. Use in the differential diagnosis of acute renal failure. 94 39

Twenty-eight goats with an artificial heart (AH) were studied pathologically. Being continued from the previous report, the liver, gastrointestinal tract, and kidneys were taken up in this paper and finally, general discussion was done to get our ideas in shape concerning the pathophysiological status of the goat. Central necrosis of the liver was always observed in the goats which survived for over 140 hours. This finding seemed to be caused mainly by circulatory insufficiency of the portal vein at the latter half of the survival time. Microscopic findings of degeneration, necrosis, and edema were commonly observed at the walls of gastrointestinal tracts, when goats showed poor apetite, mucous feces and constipation. But these problems have been improved by application of a new control method to regulate the output of AH system within a goat's physiological range since October 1974. The lesions seen in the kidneys are classified into 5 groups. The most important findings of them are lower nephron nephrosis and cortical necrosis, both of which indicate the occurrence of long standing vasoconstriction of proximal renal arteries. By means of microangiographic method and others, thrombi were detected frequently in the kidneys. The vascular walls, where thrombi were attached to, were often damaged. Therefore, these thrombi were thought to be formed in the local vessels in situ through renal circulatory insufficiency. The renal pathological lesions have been also improved and severe renal failure from which the previous goats could not escape, has been lessened since the application of a new AH control method. As a whole, the main pathophysiological status of the animals replaced by the AH are thought conclusively to be peripheral circulatory insufficiency. This would be caused by abnormal hemodynamics, so that, the essential clinical etiology is thought to be AH function itself.
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PMID:Pathological studies of the animals replaced totally with the artificial heart. Part II Concerning liver, gastrointestinal tract, kidney, and general discussion. 94 12

Renal function was evaluated in 40 patients with fulminant hepatic failure, They were divided into two groups on the basis of glomerular filtration rates greater than 40 ml/min or less than 25 ml/min. A number of patients in group 1 had markedly abnormal renal retention of sodium together with a reduced free water clearance and low potassium excretion which could be explained by increased proximal tubular reabsorption of sodium. The patients in group 2 had evidence that renal tubular integrity was maintained when the glomerular filtration rate was greater than or equal ml/min (functional renal failure), but evidence of tubular damage was present when this was less than 3 ml/min (acute tubular necrosis).
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PMID:Abnormalities of sodium excretion and other disorders of renal function in fulminant hepatic failure. 96 82

One hundred and seventy-five 67Ga-citrate scans were performed to detect suspected occult inflammatory processes. None of the patients had a known malignancy. Renal activity was noted in 12 patients (6.8%) on the 48-hr image. These patients had either pyelonephritis, acute tubular necrosis, vasculitis, or a renal abscess. Since delayed 67Ga uptake in the kidneys may be the first evidence of renal disease, further investigation, including either arteriography or biopsy, is necessary. In patients with a known malignancy, tumor involvement must be considered.
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PMID:Significance of delayed 67Ga localization in the kidneys. 96 53

Experimental examinations were performed in 22 dogs to find out the mechanism which leads to a permanent or a reversible damage of the renal parenchyma after normo- and hypothermic ischemia. For this reason the perfusion and the distribution were examined with 133Xe, the vascular changes by angiography, and the parenchymal function with 131I-Hippuran. After normothermic ischemia a short-term reactive hyperemia appeared, which however could not compensate the damage of the renal tubular cells and the resulting excretory insufficiency. After hypothermic ischemia the perfusion was reduced, probably as a consequence of a vasconstriction by cold, however, the function of the tubular cells remained intact, because of the protective mechanism of the hypothermia. The importance of these findings for the development of the so-called "shock-kidney" (acute tubular necrosis) and for the conservative renal surgery in hypothermia is discussed and the application of measures beneficial to perfusion, are suggested.
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PMID:[Changes in perfusion and blood flow distribution following normo- and hypothermic ischemia of the kidneys]. 98 Jul 93

The vasa rectae of the renal cortico-medullary junction were studied in cases of acute tubular necrosis. Although routine light microscopical observations suggested a heterogeneous population of hematopoietic cells, further studies revealed two groups that showed (1) a major fraction, consisting of the lymphoplasma-cytic series with varying stages of maturation, and (2) a minor fraction of granulocytic precursors. The possible importance of this phenomenon is discussed.
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PMID:Cellular proliferation in vasa rectae in acute tubular necrosis. A histochemical and electron microscopical study. 99 69

Acute renal failure of obstetric origin is common among North Indian patients and comprised 72 (22.1%) of 325 patients undergoing dialysis over an 11-year period. Of these, 46 gravidas had developed renal failure following abortion, and 29 cases were due to complications of late pregnancy. The most striking feature of this study was a high incidence of irreversible renal lesions of bilateral diffuse cortical necrosis in early (18.6%) as well as late pregnancy (37.8%). Overall incidence of diffuse cortical necrosis was 25%. In the remainder, acute tubular necrosis was seen in 52 (72.2%), patchy cortical necrosis in 1 (1.4%), and tubular necrosis along with glomerular involvement in 1 patient (1.4%). Pathogenetic factors which contributed to the development of renal failure, either singly or in combination, were loss of blood failure, either singly or in combination, were loss of blood (79.1%), septicemia (31.9%), hypotension due th hemorrhagic and septicemic shock (51.4%), eclamptic toxemia (11.1%), and disseminated intravascular coagulation in 12.5% patients. Infrequent occurrence of disseminated intravascular coagulation in the septic anc eclamptic patients who developed diffuse cortical necrosis was an interesting finding, as was the fact that coagulopathy was more frequently observed in acute tubular necrosis. Late referral, frequent sepsis, and high incidence of bilateral diffuse cortical necrosis contributed significantly to a high mortality (55.3%).
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PMID:Acute renal failure of obstetric origin. 108 92


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