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Chapter: Medical Physiology: Kidney Diseases and Diuretics

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Chronic Renal Failure: An Irreversible Decrease in the Number of Functional Nephrons

Chronic renal failure results from progressive and irre-versible loss of large numbers of functioning nephrons.

Chronic Renal Failure: An Irreversible Decrease in the Number of Functional Nephrons

Chronic renal failure results from progressive and irre-versible loss of large numbers of functioning nephrons. Serious clinical symptoms often do not occur until the number of functional nephrons falls to at least 70 to 75 per cent below normal. In fact, relatively normal blood concentrations of most electrolytes and normal body fluid volumes can still be maintained until the number of functioning nephrons decreases below 20 to 25 per cent of normal.

   Table 31–4 gives some of the most important causes of chronic renal failure. In general, chronic renal

 

failure, like acute renal failure, can occur because of disorders of the blood vessels, glomeruli, tubules, renal interstitium, and lower urinary tract. Despite the wide variety of diseases that can lead to chronic renal failure, the end result is essentially the same—a decrease in the number of functional nephrons.


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