Acute renal failure (ARF) is a rapid loss of renal function due to damage to the kidneys, resulting in retention of nitrogenous (urea and creatinine) and non-nitrogenous waste products that are normally excreted by the kidney. Depending on the severity and duration of the renal dysfunction, this accumulation is accompanied by metabolic disturbances, such as metabolic acidosis (acidification of the blood) and hyperkalaemia (elevated potassium levels), changes in body fluid balance, and effects on many other organ systems. It can be characterised by oliguria or anuria (decrease or cessation of urine production), although nonoliguric ARF may occur. It is a serious disease and treated as a medical emergency.

Causes

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Renal failure, whether chronic or acute, is usually categorised according to pre-renal, renal and post-renal causes:

• Pre-renal (causes in the blood supply):
  • hypotension (decreased blood supply), usually from shock or dehydration and fluid loss, heart attack
  • vascular problems, such as atheroembolic disease and renal vein thrombosis (which in part may be secondary to loss of coagulation factors due to renal dysfunction)
• Renal (damage to the kidney itself):
  • infection (of the kidney itself, typically pyelonephritis) and sepsis (systemic inflammation due to infection elsewhere)
  • toxins or medication (e.g. some NSAIDs, aminoglycoside antibiotics, amphotericin B, iodinated contrast, lithium)
  • rhabdomyolysis (breakdown of muscle tissue) - the resultant release of myoglobin in the blood affects the kidney; it can be caused by injury (especially crush injury and extensive blunt trauma), statins, MDMA (ecstasy) and some other drugs
  • hemolysis (breakdown of red blood cells) - the hemoglobin damages the tubules; it may be caused by various conditions such as sickle-cell disease, and lupus erythematosus
  • multiple myeloma, either due to hypercalcemia or "cast nephropathy" (multiple myeloma can also cause chronic renal failure by a different mechanism)
  • Acute glomerulonephritis which may due to a variety of causes, such as anti glomerular basement membrane disease/Goodpasture's syndrome, Wegener's granulomatosis or acute lupus nephritis with systemic lupus erythematosus
• Post-renal (causes in the urinary tract):
  • urinary retention (as a side-effect of medication or due to benign prostatic hypertrophy, kidney stones)
  • pyelonephritis
  • obstruction due to abdominal malignancy (e.g. ovarian cancer, colorectal cancer), or obstructed urinary catheter.

Diagnosis

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Renal failure is generally diagnosed either when creatinine or blood urea nitrogen tests are markedly elevated in an ill patient, especially when oliguria is present. Previous measurements of renal function may offer comparison, which is especially important if a patient is known to have chronic renal failure as well. If the cause is not apparent, a large amount of blood tests and examination of a urine specimen is typically performed to elucidate the cause of acute renal failure, medical ultrasonography of the renal tract is essential to rule out obstruction of the urinary tract.

Consensus criteriaBellomo R, Ronco C, Kellum JA, Mehta RL, Palevsky P; Acute Dialysis Quality Initiative workgroup. Acute renal failure - definition, outcome measures, animal models, fluid therapy and information technology needs: the Second International Consensus Conference of the Acute Dialysis Quality Initiative (ADQI) Group. Crit Care. 2004 Aug;8(4):R204-12. Epub 2004 May 24. PMID 15312219 Full Text. Criteria for ARF (Figure).Lameire N, Van Biesen W, Vanholder R. Acute renal failure. Lancet 2005;365:417-30. PMID 15680458. for the diagnosis of ARF are:

• Risk: serum creatinine increased 1.5 times OR urine production of <0.5 ml/kg body weight for 6 hours
• Injury: creatinine 2.0 times OR urine production <0.5 ml/kg for 12 h
• Failure: creatinine 3.0 times OR creatinine >355 μmol/l (with a rise of >44) or urine output below 0.3 ml/kg for 24 h
• Loss: persistent ARF or more than four weeks complete loss of kidney function

Kidney biopsy may be performed in the setting of acute renal failure,to provide a definitive diagnosis and sometimes an idea of the prognosis, unless the cause is clear and appropriate screening investigations are reassuringly negative.

Treatment

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Acute renal failure is usually reversible if treated promptly and appropriately. The main interventions are monitoring fluid intake and output as closely as possible; insertion of a urinary catheter is useful for monitoring urine output as well as relieving possible bladder outlet obstruction, such as with an enlarged prostate. In both hypovolemia and intrinsic causes (acute tubular necrosis) administering intravenous fluids is typically the first step to improve renal function. If a central venous catheter is used, a central venous pressure of 15 cmH₂O (1.5 kPa) is often used as a target for increasing circulatory volume.Galley HF. Can acute renal failure be prevented? J R Coll Surg Edinb 2000;45(1):44-50. PMID 10815380 Fulltext. If the cause is obstruction of the urinary tract, surgical relief of the obstruction (with a nephrostomy or suprapubic catheter) may be necessary. Metabolic acidosis and hyperkalemia, two prime complications of renal failure, may require medical treatment with sodium bicarbonate administration and antihyperkalemic measures, respectively.

Dopamine or other inotropes may be given to improve cardiac output and renal perfusion, and diuretics (in particular furosemide) may be administered. If a Swan-Ganz catheter is used, a pulmonary artery occlusion pressure (PAOP) of 18 mmHg (2.4 kPa) is the target for inotropic support.

Lack of improvement with fluid resuscitation, therapy-resistant hyperkalemia, metabolic acidosis or fluid overload may necessitate artificial support in the form of dialysis or hemofiltration. Depending on the cause, a proportion of patients will never regain full renal function and require lifelong dialysis or a kidney transplant.

History

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Before the advancement of modern medicine acute renal failure might be referred to as uremic poisoning. Uremia was the term used to describe the contamination of the blood with urine. Starting around 1847 this term was used to describe reduced urine output, now known as oliguria, that was thought to be caused by the urine mixing with the blood instead of being voided through the urethra.

Acute renal failure due to acute tubular necrosis (ATN) was recognised in the 1940s in the United Kingdom, where crush victims during the Battle of Britain developed patchy necrosis of renal tubules, leading to a sudden decrease in renal function.Bywaters EG, Beall D. Crush injuries with impairment of renal function. Br Med J 1941;1:427-32. Reprinted in J Am Soc Nephrol 1998;9:322-32. PMID 9527411. During the Korean and Vietnam wars, the incidence of ARF decreased due to better acute management and intravenous infusion of fluids.Schrier RW, Wang W, Polle B, Mitra A. Acute renal failure: definitions, diagnosis, pathogenesis, and therapy. J Clin Invest 2004;114:5-14. PMID 15232604. Full text.

See also

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• Hepatorenal syndrome

References

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Medical emergencies | Nephrology | Organ failure | Causes of death

Akutes Nierenversagen | Insuffisance rénale aiguë | 急性腎不全 | Insuficiência renal aguda