Kidney failure occurs when the kidneys lose their ability to function. To treat kidney failure effectively, it is important to know whether kidney disease has developed suddenly (acute) or over the long term (chronic). Many conditions, diseases, and medicines can create situations that lead to acute and chronic kidney disease. Acute kidney injury, also called acute renal failure, is more commonly reversible than chronic kidney failure.
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Symptoms of decreased kidney function, such as fluid buildup or electrolyte imbalance, are more likely to develop with acute kidney injury, regardless of how long the kidney has been malfunctioning. Symptoms may reflect the actual cause of the kidney problem.
Dehydration may cause extreme thirst; lightheadedness or faintness; a weak, rapid pulse; and other symptoms.
Symptoms of chronic kidney disease may not develop until very little kidney function remains. Other problems may develop with chronic kidney disease, such as anemia and increased levels of phosphates in the blood (hyperphosphatemia), along with complications caused by kidney failure. These complications often do not develop until kidney disease has been present for some time.
Most cases of acute kidney injury occur in people who are already in the hospital for other reasons. In these people, acute kidney injury is usually diagnosed when routine tests show a sudden increase in creatinine and blood urea nitrogen (BUN) levels. A buildup of these waste products in the blood points to a loss of kidney function. Your doctor will compare these levels to previous tests to find out if kidney disease is acute or chronic.
An ultrasound of the kidneys also may help determine whether kidney problems are acute or chronic. Normal-sized kidneys may be present in either condition, but when both kidneys are smaller than normal, chronic kidney disease is usually the problem.