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Overview: Pre-renal Disease and Acute Tubular Necrosis. By: David I. Driver, MS III. Introduction.
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Overview:Pre-renal Disease and Acute Tubular Necrosis By: David I. Driver, MS III
Introduction • The incidence of acute renal failure, independent of underlying cause, varies widely based upon the definition utilized and the patient population. Reported rates have varied from 100 to 600 per million per year • The incidence of acute renal failure is very high in hospitalized patients. An incidence of six percent has been reported among patients admitted to intensive care units, whereas among all hospitalized patients, rates of two to five percent have been reported
Etiology • The two major causes of acute renal failure developing in the hospital are acute tubular necrosis and prerenal disease • Other, less common causes of acute renal failure can be diagnosed from their characteristic features in the history, urinalysis, and, if indicated, ultrasonography. These include: • Urinary tract obstruction, usually evident as hydronephrosis on ultrasonography. • Acute interstitial nephritis, typically with a history of an offending drug plus a urinalysis showing red and white cells and, in many cases, eosinophils and white cell casts. • Acute glomerulonephritis, generally with urinalysis showing red cells, red cell casts, and proteinuria.
Diagnosis • Prerenal disease and postischemic or nephrotoxic ATN can usually be distinguished by complete examination of the urine and by serial measurements of the BUN and plasma creatinine concentration. • The major distinguishing findings between prerenal disease and ATN include: • BUN/plasma creatinine ration • Rate of rise of plasma creatinine concentration • Urinalysis • Urine sodium concentation • Fractional excreation of sodium • Urine osmolality • Urine volume • Urine to plasma creatinine concentration • Novel markers • Neutrophil gelatinase-associated lipocalin
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