Renal Function...

Definition

ability of the kidneys to excrete wastes and to help maintain the electrolyte balance

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Acute renal failure (ARF) is the sudden loss of kidney function. It occurs when the kidneys stop working over a period of hours, days, or in some cases, weeks. When ARF occurs, waste products, such as nitrogen, and excess fluids are not removed by the kidneys and build up in the body, upsetting the body's normal chemical balance. Chemicals and electrolytes, such as sodium, potassium, and calcium, which are needed for normal body functioning, become poisonous (toxic) to the body when they reach abnormally high levels.

• Decreased blood flow -- this may occur when there is extremely low blood pressure caused by trauma, complicated surgery, septic shock, hemorrhage, or burns; associated dehydration; or other severe or complicated illnesses.
• Acute tubular necrosis (ATN) -- may occur when tissues aren't getting enough oxygen or when the renal artery is blocked or narrowed (see acute arterial occlusion of the kidney and renal artery stenosis).
• Over-exposure to metals, solvents, radiographic contrast materials, certain antibiotics, and other medications or substances.
• Myoglobinuria (myoglobin in the urine) -- this condition may be caused by rhabdomyolysis, alcohol abuse, a crush injury, tissue death of muscles from any cause, seizures, and other disorders.
• Direct injury to the kidney.
• Infections such as acute pyelonephritis or septicemia.
• Urinary tract obstruction, such as a narrowing of the urinary tract (stricture), tumors, kidney stones, nephrocalcinosis or enlarged prostate with subsequent acute bilateral obstructive uropathy.
• Severe acute nephritic syndrome.
• Disorders of the blood, such as idiopathic thrombocytopenic purpura (ITP), transfusion reaction, or other hemolytic disorders, malignant hypertension and disorders resulting from childbirth, such as bleeding placenta abruptio or placenta previa can damage the kidneys.
• Autoimmune disorders such as scleroderma can cause acute renal failure.
• In young children, hemolytic uremic syndrome is an increasingly common cause of acute renal failure. A toxin-secreting bacterium, Escherichia coli, found in contaminated undercooked meats, has been implicated as the cause of hemolytic uremic syndrome.

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