11/09/2021
DEFINITION
Acute kidney failure occurs when your kidneys suddenly become unable to filter waste products from your blood. When your kidneys lose their filtering ability, dangerous levels of wastes may accumulate, and your blood's chemical makeup may get out of balance.
Acute kidney failure — also called acute renal failure or acute kidney injury — develops rapidly over a few hours or a few days. Acute kidney failure is most common in people who are already hospitalized, particularly in critically ill people who need intensive care.
Acute kidney failure can be fatal and requires intensive treatment. However, acute kidney failure may be reversible. If you're otherwise in good health, you may recover normal or nearly normal kidney function.
CAUSES
Acute kidney failure can occur when:
You have a condition that slows blood flow to your kidneysYou experience direct damage to your kidneysYour kidneys' urine drainage tubes (ureters) become blocked and wastes can't leave your body through your urineImpaired blood flow to the kidneys
Diseases and conditions that may slow blood flow to the kidneys and lead to kidney failure include:
Blood or fluid lossBlood pressure medicationsHeart attackHeart diseaseInfectionLiver failureUse of aspirin, ibuprofen (Advil, Motrin IB, others), naproxen (Aleve, others) or related drugsSevere allergic reaction (anaphylaxis)Severe burnsSevere dehydrationDamage to the kidneys
These diseases, conditions and agents may damage the kidneys and lead to acute kidney failure:
Blood clots in the veins and arteries in and around the kidneysCholesterol deposits that block blood flow in the kidneysGlomerulonephritis (gloe-mer-u-loe-nuh-FRY-tis), inflammation of the tiny filters in the kidneys (glomeruli)Hemolytic uremic syndrome, a condition that results from premature destruction of red blood cellsInfectionLupus, an immune system disorder causing glomerulonephritisMedications, such as certain chemotherapy drugs, antibiotics, dyes used during imaging tests and zoledronic acid (Reclast, Zometa), used to treat osteoporosis and high blood calcium levels (hypercalcemia)Multiple myeloma, a cancer of the plasma cellsScleroderma, a group of rare diseases affecting the skin and connective tissuesThrombotic thrombocytopenic purpura, a rare blood disorderToxins, such as alcohol, heavy metals and cocaineVasculitis, an inflammation of blood vesselsUrine blockage in the kidneys
Diseases and conditions that block the passage of urine out of the body (urinary obstructions) and can lead to acute kidney failure include:
Bladder cancerBlood clots in the urinary tractCervical cancerColon cancerEnlarged prostateKidney stonesNerve damage involving the nerves that control the bladderProstate cancer
RISK FACTORS
Acute kidney failure almost always occurs in connection with another medical condition or event. Conditions that can increase your risk of acute kidney failure include:
Being hospitalized, especially for a serious condition that requires intensive careAdvanced ageBlockages in the blood vessels in your arms or legs (peripheral artery disease)DiabetesHigh blood pressureHeart failureKidney diseasesLiver diseases
COMPLICATIONS
Potential complications of acute kidney failure include:
Fluid buildup. Acute kidney failure may lead to a buildup of fluid in your lungs, which can cause shortness of breath.Chest pain. If the lining that covers your heart (pericardium) becomes inflamed, you may experience chest pain.Muscle weakness. When your body's fluids and electrolytes — your body's blood chemistry — are out of balance, muscle weakness can result. Elevated levels of potassium in your blood are particularly dangerous.Permanent kidney damage. Occasionally, acute kidney failure causes permanent loss of kidney function, or end-stage renal disease. People with end-stage renal disease require either permanent dialysis — a mechanical filtration process used to remove toxins and wastes from the body — or a kidney transplant to survive.Death. Acute kidney failure can lead to loss of kidney function and, ultimately, death. The risk of death is higher in people who had kidney problems before acute kidney failure.
PREPARING FOR YOUR APPOINTMENTSYMPTOMS
Signs and symptoms of acute kidney failure may include:
Decreased urine output, although occasionally urine output remains normalFluid retention, causing swelling in your legs, ankles or feetDrowsinessShortness of breathFatigueConfusionNauseaSeizures or coma in severe casesChest pain or pressure
Sometimes acute kidney failure causes no signs or symptoms and is detected through lab tests done for another reason.
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