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kidneys are a pair of organs located toward the lower back. One kidney is on each side of your spine. They filter your blood and remove toxins from your body. Your kidneys send toxins to your bladder. Your body later removes toxins during urination.
Kidney failure occurs when your kidneys lose the ability to filter waste from your blood sufficiently. Many factors can interfere with your kidney health and function, such as:
toxic exposure to environmental pollutants or certain medications
certain acute and chronic diseases
Your body becomes overloaded with toxins if your kidneys can’t do their regular job. This can lead to kidney failure and even be life-threatening if it’s left untreated.
What are the symptoms of kidney failure?
Many different symptoms can occur during kidney failure. Usually someone with kidney failure will have a few symptoms of the disease, though sometimes none are present. Possible symptoms include:
a reduced amount of urine
swelling of your legs, ankles, and feet from retention of fluids caused by the failure of your kidneys to eliminate water waste
unexplained shortness of breath
excessive drowsiness or fatigue
pain or pressure in your chest
What causes kidney failure?
People who are most at risk for kidney failure usually have one or more of the following causes:
Loss of blood flow to the kidneys
A sudden loss of blood flow to your kidneys can prompt kidney failure. Some diseases and conditions that cause loss of blood flow to the kidneys include:
a heart attack
scarring of the liver or liver failure
a severe burn
an allergic reaction
a severe infection, such as sepsis
High blood pressure and anti-inflammatory medications can also limit blood flow.
Urine elimination problems
When your body can’t eliminate urine, toxins build up and overload the kidneys. Some cancers can block the urine passageways. These include prostate (most common type in men), colon, cervical, and bladder cancers.
Other conditions can interfere with urination and possibly lead to kidney failure, including:
an enlarged prostate
blood clots within your urinary tract
damage to the nerves that control your bladder
Some diseases and conditions may lead to kidney failure, including:
a blood clot in or around your kidneys
an overload of toxins from heavy metals
drugs and alcohol
vasculitis, an inflammation of blood vessels
lupus, an autoimmune disease that can cause inflammation of many body organs
glomerulonephritis, an inflammation of the small blood vessels of the kidneys
hemolytic uremic syndrome, which involves the breakdown of red blood cells following a bacterial infection, usually of the intestines
multiple myeloma, a cancer of the plasma cells in your bone marrow
scleroderma, an autoimmune disease that affects your skin
thrombotic thrombocytopenic purpura, a disorder that causes blood clots in small vessels
chemotherapy drugs, medications that treat cancer and some autoimmune diseases
dyes used in some imaging tests
Five types of kidney failure
There are five different types of kidney failure:
Acute prerenal kidney failure
Insufficient blood flow to the kidneys can cause acute prerenal kidney failure. The kidneys can’t filter toxins from the blood without enough blood flow. This type of kidney failure can usually be cured once you and your doctor determine the cause of the decreased blood flow.
Acute intrinsic kidney failure
Acute intrinsic kidney failure can be caused by direct trauma to the kidneys, such as physical impact or an accident. Causes also include toxin overload and ischemia, which is a lack of oxygen to the kidneys. The following may cause ischemia:
renal blood vessel obstruction
Chronic prerenal kidney failure
When there isn’t enough blood flowing to the kidneys for an extended period of time, the kidneys begin to shrink and lose the ability to function.
Chronic intrinsic kidney failure
This happens when there is long-term damage to the kidneys due to intrinsic kidney disease. Intrinsic kidney disease is caused by a direct trauma to the kidneys, such as severe bleeding or a lack of oxygen.
Chronic post-renal kidney failure
A long-term blockage of the urinary tract prevents urination. This causes pressure and eventual kidney damage.
How is kidney failure diagnosed?
There are several tests your doctor can use to diagnose kidney failure. These include:
Your doctor may take a urine sample to test for any abnormalities, including abnormal protein or sugar that spills into the urine. Your doctor may also perform a urinary sediment examination. This measures the amount of red and white blood cells, looks for high levels of bacteria, and searches for high numbers of cellular casts.
Urine volume measurements
Measuring urine output is one of the simplest tests to help diagnose kidney failure. For example, low urinary output may suggest that kidney disease is due to a urinary blockage, which can be caused by multiple illnesses or injuries.
Your doctor may order blood tests to measure substances that are filtered by your kidneys, such as blood urea nitrogen (BUN) and creatinine (Cr). A rapid rise in these levels may indicate acute kidney failure.
Tests such as ultrasounds, MRIs, and CT scans provide images of the kidneys themselves, along with the urinary tract. This allows your doctor to look for blockages or abnormalities in your kidneys.
Kidney tissue sample
Tissue samples are examined for abnormal deposits, scarring, or infectious organisms. Your doctor will use a kidney biopsy to collect the tissue sample. A biopsy is a simple procedure that’s usually performed while you’re awake. You’ll have a local anesthetic to eliminate any discomfort. The sample is collected with a biopsy needle inserted through your skin and down into the kidney. X-ray or ultrasound equipment is used to locate the kidneys and assist the doctor in guiding the needle.
Treatment for kidney failure
There are several treatments for kidney failure. The type of treatment you need will depend on the reason for your kidney failure. Your doctor can help you determine the best treatment option, which may include:
Dialysis filters and purifies the blood using a machine. The machine performs the function of the kidneys. Depending on the type of dialysis, you may be connected to a large machine or a portable catheter bag. You may need to follow a low-potassium, low-salt diet along with dialysis.
Dialysis doesn’t cure kidney failure, but it will extend your life if you go to regularly scheduled treatments.
Another treatment option is a kidney transplant. There’s usually a long wait to receive a donor kidney that’s compatible with your body, though if you have a living donor the process may go more quickly.
The advantages of a transplant are that the new kidney can work perfectly, and dialysis is no longer required. The disadvantage is that you must take immunosuppressive drugs after the surgery. These drugs have their own side effects, some of which are serious. Also, transplant surgery is not always successful.
Preventing kidney failure
There are steps you can take to reduce your risk of kidney failure.
Follow directions when taking over-the-counter medications. Taking doses that are too high (even of common drugs such as aspirin) can create high toxin levels in a short amount of time. This can overload your kidneys.
Whenever possible, you should limit your exposure to chemicals, such as household cleaners, tobacco, pesticides, and other toxic products.
Many kidney or urinary tract conditions lead to kidney failure when they’re not managed properly. Follow your doctor’s advice, always take prescribed medicine as directed, and maintain a healthy lifestyle.
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