What causes acute renal failure?

Acute renal failure occurs when kidney function declines suddenly, preventing the body from eliminating waste and maintaining fluid balance. This condition generally arises from three primary mechanisms:1

• Ischemia (Reduced Blood Supply): When blood flow to the kidneys is restricted, the tissue may suffer necrosis. Common causes include severe hemorrhage, medical or surgical shock, septicemia, severe burns, dehydration (e.g., from diarrhea), incompatible blood transfusions, and heart attacks.12
• Toxic Damage: The kidneys can be damaged by substances that become concentrated in the tubular fluid, harming the lining cells. This includes exposure to heavy metals (such as mercury, lead, arsenic, and uranium), organic solvents (like carbon tetrachloride, methanol, and ethylene glycol), certain antibacterial agents, and specific fungi.12
• Obstruction: Acute failure can result from a sudden blockage of the urinary tract, which prevents the flow of urine from the kidneys.12

Additionally, acute renal failure may be triggered by severe inflammatory conditions, such as acute glomerulonephritis, or by acute immunologic rejection following a kidney transplant. Prompt treatment of the underlying cause is essential to allow the kidney tissue to regenerate.1