Chronic kidney failure
 
 
 
  

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Chronic kidney failure

Definition

Chronic renal failure is a gradual and progressive loss of the ability of the kidneys to excrete wastes, concentrate urine, and conserve electrolytes.

Alternative Names

Kidney failure - chronic; Renal failure - chronic; Chronic renal insufficiency; CRF; Chronic kidney failure

Causes

Unlike acute renal failure with its sudden, reversible failure of kidney function, chronic renal failure slowly gets worse. It most often results from any disease that causes gradual loss of kidney function. It can range from mild dysfunction to severe kidney failure. Progression may continue to end-stage renal disease (ESRD).

Chronic renal failure usually occurs over a number of years as the internal structures of the kidney are slowly damaged. In the early stages, there may be no symptoms. In fact, progression may be so gradual that symptoms do not occur until kidney function is less than one-tenth of normal.

Chronic renal failure and ESRD affect more than 2 out of 1,000 people in the U.S. Diabetes and hypertension (high blood pressure) are the two most common causes and account for approximately two-thirds of the cases of chronic renal failure and ESRD. Other major causes include the following:

Chronic renal failure results in the accumulation of fluid and waste products in the body, causing azotemia and uremia. Azotemia is the buildup of nitrogen waste products in the blood. It may occur without symptoms. Uremia is the state of ill health resulting from renal failure. Most body systems are affected by chronic renal failure. Fluid retention and uremia can cause many complications.

Symptoms

Initial symptoms may include the following:

  • Unintentional weight loss
  • Nausea, vomiting
  • General ill feeling
  • Fatigue
  • Headache
  • Frequent hiccups
  • Generalized itching (pruritus)

Later symptoms may include the following:

  • Increased or decreased urine output
  • Need to urinate at night
  • Easy bruising or bleeding
  • May have blood in the vomit or in stools
  • Decreased alertness
    • drowsiness, somnolence  lethargy
    • confusion  delirium
    • coma
  • Muscle twitching or cramps
  • Seizures
  • Uremic frost -- deposits of white crystals in and on the skin
  • Decreased sensation in the hands, feet, or other areas

Additional symptoms that may be associated with this disease:

  • Excessive nighttime urination
  • Excessive thirst
  • Abnormally dark or light skin
  • Paleness
  • Nail abnormalities
  • Breath odor
  • High blood pressure
  • Loss of appetite
  • Agitation

Exams and Tests

There may be mild to severe high blood pressure. A neurologic examination may show polyneuropathy. Abnormal heart or lung sounds may be heard with a stethoscope.

A urinalysis may show protein or other abnormalities. An abnormal urinalysis may occur 6 months to 10 or more years before symptoms appear.

  • Creatinine levels progressively increase
  • BUN is progressively increased
  • Creatinine clearance progressively decreases
  • Potassium test may show elevated levels
  • Arterial blood gas and blood chemistry analysis may show metabolic acidosis

Changes that indicate chronic renal failure, including both kidneys being smaller than normal, may be seen on:

  • Renal or abdominal x-ray
  • Abdominal CT scan
  • Abdominal MRI
  • Abdominal ultrasound

This disease may also alter the results of the following tests:

  • Urinary casts
  • Renal scan
  • PTH
  • Serum magnesium - test
  • Erythropoietin

Treatment

Treatment focuses on controlling the symptoms, minimizing complications, and slowing the progression of the disease.

Associated diseases that cause or result from chronic kidney failure must be controlled. High blood pressure, congestive heart failure, urinary tract infections, kidney stones, obstructions of the urinary tract, glomerulonephritis, and other disorders should be treated as appropriate.

Blood transfusions or medications such as iron and erythropoietin supplements may be needed to control anemia.

Fluid intake may be restricted, often to an amount equal to the volume of urine produced. Dietary protein restriction may slow the build-up of wastes in the bloodstream and control associated symptoms such as nausea and vomiting. Salt, potassium, phosphorus, and other electrolytes may be restricted.

Dialysis or kidney transplant may be required eventually.

Support Groups

The stress of illness can often be helped by joining a support group where members share common experiences and problems. See kidney disease - support group.

Outlook (Prognosis)

There is no cure for chronic renal failure. Untreated, it usually progresses to end-stage renal disease. Lifelong treatment may control the symptoms of chronic renal failure.

Possible Complications

When to Contact a Medical Professional

Call your health care provider if nausea or vomiting persists for more than 2 weeks.

Call your health care provider if decreased urine output or other symptoms of chronic renal failure occur.

Prevention

Treatment of the underlying disorders may help prevent or delay development of chronic renal failure. Diabetics should control blood sugar and blood pressure closely and should refrain from smoking.




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Acute glomerulonephritis



 
  
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