Which are the cause of acute renal failure

Acute renal failure is a clinicalsyndrome because the sharp decline in a variety of causes of kidney function, mainlycited the level of serum creatinine or blood urea nitrogen increased, the body, varioussymptoms, in patients with acute renal failure appear with or without urine or oliguria.Then the cause of acute renal failure caused by what? Following details for the patientsfriends:
Etiology of acute renal failure:
If you have the following conditions, then a greater chance of acute renal failure:
The ① older adults;
(2) long-term health problems such as kidney or liver disease, diabetes, hypertension, heart disease or obesity;
If the patient disease is very serious, and was admitted to the acute intensive care unit, cardiac surgery, abdominal surgery or bone marrow transplants, when the patientcomplicated by acute renal failure more likely.
Etiology of acute renal failure:
The urinary system of acute obstruction, resulting in the urine can not be excreted fromthe kidney. Kidney stones, tumors, trauma, or benign prostatic hypertrophy can causeobstruction. From the harm of drugs, poisons and infections. Most patients do not take drugs caused kidney problems, but long-term serious health problems the patient will usually take drugs and cause their kidneys hurt.
Acute renal failure etiology:
The sudden seriousness of renal hypoperfusion. Bleeding, serious injury and infectioncan reduce renal blood perfusion. Body fluid can cause kidney damage.