Acute renal failure
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| Acute renal failure Classification and external resources | |
| ICD-10 | N17.2 |
|---|---|
| ICD-9 | 584 |
| MedlinePlus | 000501 |
| eMedicine | med/1595 |
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Overview
Acute renal failure (ARF), also known as acute kidney failure, 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.
Common Causes
Acute renal failure is usually categorised (as in the flowchart below) according to pre-renal, renal and post-renal causes.
| Acute Renal Failure | |||||||||||||||||||||||||||||||||
| Pre-renal | Renal | Post-renal | |||||||||||||||||||||||||||||||
- Pre-renal (causes in the blood supply):
- hypovolemia (decreased blood volume), usually from shock or dehydration and fluid loss or excessive diuretics use.
- hepatorenal syndrome in which renal perfusion is compromised in liver failure
- vascular problems, such as atheroembolic disease and renal vein thrombosis (which can occur as a complication of the nephrotic syndrome)
- Renal (damage to the kidney itself):
- infection usually sepsis (systemic inflammation due to infection),rarely of the kidney itself, termed pyelonephritis
- toxins or medication (e.g. some NSAIDs, aminoglycoside antibiotics, 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, stimulants 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 be 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 (obstructive causes in the urinary tract) due to:
- medication interfering with normal bladder emptying.
- benign prostatic hypertrophy or prostate cancer.
- kidney stones.
- due to abdominal malignancy (e.g. ovarian cancer, colorectal cancer).
- obstructed urinary catheter.
Complete Differential Diagnosis of Acute Renal Failure
Prerenal Causes
- Acute pancreatitis
- Aortic aneurysm
- Cirrhosis
- Dehydration
- Drugs such as diuretics
- Gastrointestinal bleeding
- Hemolysis
- Hepatorenal syndrome
- Hypovolemia
- Metrorrhagia
- Nephrotic syndrome
- Peritonitis
- Pre-eclampsia
- Rhabdomyolysis
- Renal artery stenosis
- Renal vein thrombosis
- Severe sodium and chloride loss
- Shock of various orgins
- Surgery
- Therapy with ACE inhibitors
- Trauma
- Water / electrolyte loss
Renal Causes
- Arteriosclerosis of the renal arteries
- Bilateral renal cortical necrosis
- Glomerulonephritis
- Hemolytic-Uremic Syndrome
- Kidney transplant rejection
- Interstitial nephritis
- Malignant hypertension
- Occlusion of the renal arteries
- Polyarteritis nodosa PAN
- Pyelonephritis
- Scleroderma
- Thrombotic thrombocytopenic purpura
- Tubulointerstitial renal failure
- Vasculitis
Postrenal Causes
- Bladder stone
- Bladder carcinoma
- Bladder infection
- Bladder neuropathy
- Colorectal cancer
- Multiple sclerosis
- Neurosyphillis
- Ovarian cancer
- Phimosis
- Prostatic hypertrophy
- Prostatitis
- Ruptured ureter
- Spinal cord stenosis
- Syringomyelia
- Tabes dorsalis
- Trabeculated bladder
- Urethral atresia
- Urethral trauma
- Urethral stricture
Diagnosis
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 criteria[1][1] 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
Acute renal failure may be 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 the absence of fluid overload, administering intravenous fluids is typically the first step to improve renal function. Fluid administration may be monitored with the use of a central venous catheter to avoid over or under replacement of fluid. If the cause is obstruction of the urinary tract, relief of the obstruction (with a nephrostomy or urinary catheter) may be necessary. Metabolic acidosis and hyperkalemia, the two most serious biochemical manifestations of acute renal failure, may require medical treatment with sodium bicarbonate administration and antihyperkalemic measures, unless dialysis is required.
Should hypotension prove a persistent problem in the fluid replete patient, dopamine or other inotropes may be given to improve cardiac output and renal perfusion. A Swan-Ganz catheter may be used, to measure pulmonary artery occlusion pressure to provide a guide to left atrial pressure (and thus left heart function) as a 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, thus having end stage renal failure requiring lifelong dialysis or a kidney transplant.
History
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.[1] During the Korean and Vietnam wars, the incidence of ARF decreased due to better acute management and intravenous infusion of fluids.[1]
See also
References
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
