Acute tubular necrosisNecrosis - renal tubular- ATN- Necrosis - acute tubular

Acute tubular necrosis is a kidney disorder involving damage to the tubule cells of the kidneys, which can lead to acute kidney failure.

Causes, incidence, and risk factors

Acute tubular necrosis (ATN) is usually caused by lack of oxygen to the kidney tissues (ischemia of the kidneys). It may also occur if the kidney cells are damaged by a poison or harmful substance.

The internal structures of the kidney, particularly the tissues of the kidney tubule, become damaged or destroyed. ATN is one of the most common structural changes that can lead to acute renal failure.

ATN is one of the most common causes of kidney failure in hospitalized patients. Risks for acute tubular necrosis include:

Blood transfusion reaction

Injury or trauma that damages the muscles

Low blood pressure (hypotension) that lasts longer than 30 minutes

Recent major surgery

Septic shock due to severe infection

Liver disease and kidney damage caused by diabetes (diabetic nephropathy) may make a person more susceptible to the condition.

ATN can also be caused by:

Dye (contrast) used for x-ray (radiology) studies

Medications that are toxic to the kidneys (such as aminoglycoside antibiotics or amphotericin)


Decreased consciousness


Delirium or confusion

Drowsy, lethargic, hard to arouse

Decreased urine output or no urine output

General swelling, fluid retention

Nausea, vomiting

Note: Other symptoms of acute kidney failure may also be present.

Signs and tests

The doctor will perform a physical exam. Your doctor may hear abnormal sounds when listening to the heart and lungs with a stethoscope (auscultation). This is due to too much fluid in the body.

Other tests that may be done include:

BUN and serum creatinine

Fractional excretion of sodium

Kidney biopsy


Urine sodium

Urine specific gravity and osmolarity urine


In most people, ATN is reversible. The goal of treatment is to prevent life-threatening complications of acute kidney failure.

Treatment focuses on preventing the excess build-up of fluids and wastes, while allowing the kidneys to heal. Patents should be watched closely for deterioration of kidney function.

Treatment can include:

Identifying and treating the underlying cause of the problem

Restricting fluid intake to a volume equal to the volume of urine produced

Restricting substances normally removed by the kidneys (such as protein, sodium, potassium) to minimize their buildup in the body

Taking medications to help control potassium levels in the bloodstream

Medicines taken by mouth or through an IV to help remove fluid from the body

Temporary dialysis can remove excess waste and fluids. This can make you feel better, and may make the kidney failure easier to control. Dialysis may not be necessary for all people, but is often lifesaving, especially if serum potassium is dangerously high.

Dialysis may be needed in the following cases:

Decreased mental status

Fluid overload

Increased potassium levels


To remove toxins that are dangerous to the kidneys

Total lack of urine production

Uncontrolled buildup of nitrogen waste products

Expectations (prognosis)

How long symptoms last can vary. You may make less urin for a few days to 6 weeks or more. This may be followed by a period of high urine output. This occurs because the healed and newly functioning kidneys try to clear the body of fluid and wastes.

One or two days after your urine amount rises, symptoms reduce and test results begin to return to normal.


Bleeding from the gastrointestinal tract

Chronic kidney disease and permanent kidney damage

High blood pressure

Increased risk of infection

Calling your health care provider

Call your health care provider if your urine output decreases or stops, or if you develop other symptoms of acute tubular necrosis.


Promptly treating conditions that can lead to decreased blood flow and/or decreased oxygen to the kidneys can reduce the risk of acute tubular necrosis.

Blood transfusions are crossmatched to reduce the risk of incompatibility reactions.

Control conditions such as diabetes, liver disorders, and cardiac disorders to reduce the risk of acute tubular necrosis.

Carefully monitor exposure to medications that can be toxic to the kidney. Have your blood levels of these medications checked regularly. Drink a lot of fluids after having any radiocontrast dyes to allow them to be removed from the body and reduce the risk of kidney damage.