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Gout



Gout
Classification & external resources
Uric acid
ICD-10 M10.
ICD-9 274.0 274.1 274.8 274.9
OMIM 138900 300323
DiseasesDB 29031
eMedicine med/924  orthoped/124 emerg/221 med/1112 oph/506 radio/313
MeSH D006073

Gout (also called metabolic arthritis) is a disease created by a buildup of uric acid. In this condition, monosodium urate or uric acid crystals are deposited on the articular cartilage of joints, tendons and surrounding tissues due to elevated concentrations of uric acid in the blood stream. This provokes an inflammatory reaction of these tissues.

Additional recommended knowledge

Contents

Signs and symptoms

  The classic picture is of excruciating, sudden, unexpected, burning pain, swelling, redness, warmness and stiffness in the joint. Low-grade fever may also be present. The patient usually suffers from two sources of pain. The crystals inside the joint cause intense pain whenever the affected area is moved. The inflammation of the tissues around the joint also causes the skin to be swollen, tender and sore if it is even slightly touched. For example, a blanket or even the lightest sheet draping over the affected area could cause extreme pain.

Gout usually attacks the big toe (approximately 75 percent of first attacks); however, it also can affect other joints such as the ankle, heel, instep, knee, wrist, elbow, fingers, and spine. In some cases, the condition may appear in the joints of small toes that have become immobile due to impact injury earlier in life, causing poor blood circulation that leads to gout.

Patients with longstanding hyperuricemia (see below) can have uric acid crystal deposits called tophi (singular: tophus) in other tissues such as the helix of the ear. Uric acid stones can form as one kind of kidney stone in some cases.

Diagnosis

Hyperuricemia is a common feature, although, urate levels are not always raised.[1] Hyperuricemia is defined as a plasma urate (uric acid) level greater than 420 μmol/L (7.0 mg/dL) in males (or 380 μmol/L in females). However, a high uric acid level does not necessarily mean a person will develop gout. Urate is within the normal range in up to two-thirds of cases.[2] If gout is suspected, the serum urate test should be repeated once the attack has subsided. Other blood tests commonly performed are full blood count, electrolytes, renal function and erythrocyte sedimentation rate (ESR). This helps to exclude other causes of arthritis, most notably septic arthritis.

A definitive diagnosis of gout is from light microscopy of fluid aspirated from the joint (this test may be difficult to perform) to demonstrate intracellular monosodium urate crystals in synovial fluid polymorphonuclear leukocytes. The urate crystal is identified by strong negative bi-refringence under polarised microscopy and its needle-like morphology. A trained observer does better in distinguishing them from other crystals.

Pathogenesis

Gout occurs when mono-sodium urate crystals form on the articular cartilage of joints, on tendons, and in the surrounding tissues. Purine metabolism gives rise to uric acid, which is normally excreted in the urine. Uric acid is more likely to form into crystals when there is a hyperuricemia, although it is 10 times more common without clinical gout than with it.[3]

Purines can be generated by the body via breakdown of cells in normal cellular turnover, or can be ingested in purine-rich foods such as seafood. The kidneys are responsible for approximately one-third of uric acid excretion, with the gut responsible for the rest. It may be possible that defects in the kidney that may be genetically determined are responsible for the predisposition of individuals for developing gout.

There are also different racial propensities to develop gout. Gout is high among the peoples of the Pacific Islands, and the Māori of New Zealand, but rare in the Australian aborigine despite the latter's higher mean concentration of serum uric acid.[4] In the United States, gout is twice as prevalent in African American males as it is in Caucasians.[5]

A seasonal link also may exist, with significantly higher incidence of acute gout attacks occurring in the spring.[6] [7]

Hyperuricemia is considered an aspect of metabolic syndrome, although its prominence has been reduced in recent classifications. This explains the increased prevalence of gout among obese individuals.

Gout is a form of arthritis that affects mostly men between the ages of 40 and 50. The high levels of uric acid in the blood are caused by protein rich foods. Alcohol intake often causes acute attacks of gout and hereditary factors may contribute to the elevation of uric acid. Typically, persons with gout are obese, predisposed to diabetes and hypertension, and at higher risk of heart disease. Gout is more common in affluent societies due to a diet rich in proteins, fat, and alcohol. When it follows as a consequence of other health conditions such as renal failure, it is often regardless of the person's lifestyle. [8] Lin, et al have statistical evidence linking gout to lead poisoning [9] and lead level in the body is significantly correlated with urate excretion and gout [10]. It is known that lead sugar was used to sweeten wine, and that chronic lead poisoning is a cause of gout,[11][12] which condition is then known as saturnine gout, because of its association with alcohol and excess.[13]

Gout also can develop as co-morbidity of other diseases, including polycythaemia, leukaemia, intake of cytotoxics, obesity, diabetes, hypertension, renal disorders, and hemolytic anemia. This form of gout is often called secondary gout. Diuretics (particularly thiazide diuretics) have traditionally been blamed for precipitating attacks of gout, but a Dutch case-control study from 2006 appears to cast doubt on this conclusion.[14]

 

Treatment

Acute attacks

The first line of treatment should be pain relief. Once the diagnosis has been confirmed, the drugs of choice are indomethacin, other nonsteroidal anti-inflammatory drugs (NSAIDs), oral glucocorticoids, or intra-articular glucocorticoids administered via a joint injection.

Colchicine was previously the drug of choice in acute attacks of gout, as it impairs the motility of granulocytes and can prevent the inflammatory phenomena that initiate an attack. Colchicine should be taken within the first 12 hours of the attack and usually relieves the pain within 48 hours, although side effects (gastrointestinal upset such as diarrhea and nausea) can complicate its use. NSAIDs are the preferred form of analgesia for patients with gout.

A randomized controlled trial found similar benefit from nonsteroidal anti-inflammatory drugs and oral glucocorticoids; however, less adverse drug reactions occurred in the glucocorticoids group.[15] In the nonsteroidal anti-inflammatory drugs group, each patient initially received diclofenac (75 mg) intramuscularly, indomethacin 50 mg orally, and acetaminophen 1 g orally. The patient was received a 5-days of indomethacin (50 mg orally every 8 hours for 2 days, followed by indomethacin 25 mg every 8 hours for 3 days), and acetaminophen 1 g every 6 hours as needed. The glucocorticoids patients received prednisolone 30 mg orally, and acetaminophen 1 g orally. The patient was then given prednisolone 30 mg orally once per day for five days.

Before medical help is available, some over-the-counter medications can provide temporary relief from pain and swelling. NSAIDs such as ibuprofen can reduce the pain and inflammation slightly, although aspirin should not be used as it can worsen the condition. Preparation H hemorrhoidal ointment can be applied to the swollen skin to reduce the swelling temporarily. Professional medical care is needed for long-term management of gout.

Ice may be applied for 20–30 minutes several times a day, and a randomized controlled trial found that patients who used ice packs had better relief of pain without side effects.[16] Keeping the affected area elevated above the level of the heart also may help.

Due to swelling around affected joints for prolonged periods, shedding of skin may occur. This is particularly evident when small toes are affected and may promote fungal infection in the web region if dampness occurs, and treatment is similar to that for common athlete's foot.

Some sufferers of Gout report an aggravation of the condition in the knees and toes associated with long periods of immobility, such as when sitting at a computer desk for long hours. This can be particularly unfortunate if the sufferer is searching for work as the aggravation can interfere with mobility. Sufferers who notice early swelling or early pain may appear to be able to arrest the aggravation when medical treatment is applied before the condition gets worse. Where this is the case, a medically prescribed anti-inflammatory oral treatment taken with food and bed rest may provide relief within 6-8 hours.

Another possibility is use of acetazolamide, one of the first diuretics discovered. This drug inhibits the action of carbonic anhydrase on the proximal convoluted tubules within the kidneys, which effectively inhibits reabsorption of bicarbonate, thus alkalinizing the urine. After two to three days of usage, the diuretic effects of this drug decline because of increased downstream reabsorption of ions and water by the renal tubules; however, the alkalinization of urine persists, and this basic urine attracts weak acids such as uric acid and cystine into the urine, thus increasing their urinary excretion.35

Chronic joint changes

For extreme cases of gout, surgery may be necessary to remove large tophi and correct joint deformity.

Prevention

Medications

  • Febuxostat ((2-[3-cyano-4-isobutoxyphenyl]-4-methylthiazole-5-carboxylic acid) - a non-purine inhibitor of xanthine oxidase seems to be an alternative that is superior to allopurinol; it is currently in Phase III trials.[17]
  • Probenecid, a uricosuric drug that promotes the excretion of uric acid in urine, is also commonly prescribed - often in conjunction with colchicine. The drug fenofibrate (which is used in treating hyperlipidemia) also exerts a beneficial uricosuric effect.[18]
  • As arterial hypertension quite often coexists with gout, treating it with losartan, an angiotensin II receptor antagonist, might have an additional beneficial effect on uric acid plasma levels. This way losartan can offset the negative side-effect of thiazides (a group of diuretics used for high blood pressure) on uric acid metabolism in patients with gout.
  • It is suspected that in many cases gout may be secondary to untreated sleep apnea, when oxygen-starved cells break down and release purines as a by-product. Treatment for apnea can be effective in lessening incidence of acute gout attacks.[19]
  • A study in 2004 suggests that animal flesh sources of purine, such as beef and seafood, greatly increase the risk of developing gout. However, high-purine vegetable sources did not. Dairy products such as milk and cheese significantly reduced the chances of gout. The study followed over 40000 men over a period of 12 years, in which 1300 cases of gout were reported.[20]
  • PEG-uricase, a polyethylene glycol ("PEG") conjugate of recombinant porcine uricase (urate oxidase), which breaks down the uric acid deposits is being studied in Phase III clinical trials for the treatment of severe, treatment-refractory gout in the United States in 2006.Pipeline
  • Sodium bicarbonate (baking soda) is an old remedy,[21] thought to work by raising blood pH (lowering blood acidity). However, the added sodium may be inappropriate for some people.
  • Ethylenediaminetetraacetic acid, a chelator of lead, has successfully increased uric acid excretion [22]. This should be an advantageous treatment for those people whose gout was caused by lead poisoning. Care should be taken to increase intake of trace essential elements since chelation often remove these elements also.
  • Gout can be triggered by the same agents that cause potassium losses such as fasting, surgery, and potassium losing diuretics [23]. A potassium deficiency can increase urate levels in the blood [24]. So potassium supplements should be advantageous to treat gout.
  • Research from the University of British Columbia suggests long-term coffee consumption is associated with a lower risk of gout. [25][26]

Diet

See Saag and Choi, 2006, an open-access review article, for detailed references and further information.[27]

The serum level of uric acid is the primary risk factor for gout. The serum level is the result of both intake (diet) and output (excretion).

Reduce intake of purines

The solubility threshold for uric acid is approximately 6.7 mg/dl; above this threshold crystals may form. Healthy subjects in the Normative Aging Study who had serum levels of uric acid over 9.0 mg/dl suffered a 22% incidence of gout over six years, compared to less than one percent for those with 7.0-8.9 mg/dl. The average uric acid level in men is 5.0 mg/dl, and substitution of a purine-free formula diet reduces this to 3.0 mg/dl. A purine-restricted diet lowers the level nearly as much (1-2 mg/dl).

A diet low in purines reduces the serum level of uric acid, unless these levels are caused by other health conditions and not as responsive to dietary changes. For notable sources of dietary purines, see "Foods to avoid" section below.


Protein is a crude proxy for purines; a more precise proxy is muscle. Apart from the notable dietary purines above, the main source of dietary purines is DNA and RNA, via their bases adenine and guanine. All sources of dietary protein supply some purines, but some sources provide far more purines than others. Meat (particularly dark meat) and seafood are high in purine because muscle cells are packed with mitochondria, which have their own DNA and RNA. In a large prospective study, high consumption of meat and seafood were found associated with an elevated risk of gout onset (41% and 50%, respectively). High consumption of dairy products, high in protein but very low in DNA and RNA, was associated with a 44% decrease in the incidence of gout. Consumption of the more purine-rich vegetables or a high protein diet per se had no significant correlation.

Consumption of beer is associated with a 49% increase in relative risk per daily 12-oz serving. By contrast, consumption of spirits was associated with only a 15% increase in relative risk, and no association at all was found with consumption of wine.

Some medical drugs are purine-based. Notable among these are the purine-analog antimetabolite drugs, sometimes used as chemotherapy agents.

Increase output of uric acid

Ingestion of 500 mg of Vitamin C per day has been shown to bring about a 0.5 mg/dl decrease in serum uric acid through increased excretion. [28]

Some Gout sufferers have recently found that taking up to 1,000 mg of Vitamin C, combined with a small dosage (approx. 10-15 mg./day) of Lithium have had very beneficial effects on their uric acid levels.[citation needed]

Vitamin C, taken in high doses, can help decrease blood uric acid levels[citation needed], but should not be taken without a doctor's supervision. Note that there is a small subset of people with gout who will actually get worse with high levels of vitamin C. Also, a single high dose can free up too much uric acid and cause kidney stones. (University of Maryland Medical Center for Integrative Medicine).

Other approaches

Additional dietary recommendations can be made which reduce gout indirectly, by reducing gout risk factors such as obesity, hypertension, cardiovascular disease, diabetes, and metabolic syndrome.

The following suggestions do not meet with universal approval among medical practitioners.

Low purine diet:

  • To lower uric acid:
    • cherries were reported to reduce uric acid in a small study.[29][30]
    • celery extracts (celery or celery seed either in capsule form or as a tea) is believed by many to reduce uric acid levels (although these are also diuretics).[citation needed] Celery extracts have been reported to act synergistically with anti-inflammatory drugs.[31]
    • Cheese has been recommended as a low-purine food,[32] and dairy products have been found to reduce the risk of gout.
  • Food to avoid:
    • foods high in purines
      • limit food high in protein such as meat, fish, poultry, or tofu to 8 ounces (226 grams) a day. Avoid entirely during a flare up.[citation needed] Tofu has been proposed as a safe source of protein for gout patients due to its small and transient effect on plasma urate levels.[33]
      • sweetbreads, kidneys, liver, brains, or other offal meats.[34][35]
      • sardines and anchovies [36]
      • seafood [37]
      • Asparagus. Cauliflower. Mushrooms. Spinach. Dry beans (lentils & peas).
      • alcohol.[38] Some claim that this applies especially to beer (high in guanosine), on the basis that brewer's yeasts are very rich in purine. Since most modern commercial beer contains only trace amounts of yeast, this claim requires further substantiation.[citation needed] Formerly, port wine was sweetened with litharge, causing lead poisoning, of which gout is a complication. Ironically, red wines, particularly those produced by traditional methods,[39] contain procyanidins released from grape seeds during wine making, which have been reported to lower serum uric acid levels by an indirect mechanism.[40] However, withdrawal of urate-lowering therapy is associated with recurrence of acute gouty arthritis.[41]
      • meat extracts, consommés, and gravies[42]
  • To avoid dehydration:
    • Drink plenty of liquids, especially water, to dilute and assist excretion of urates;
    • Avoid diuretic foods or medicines like aspirin(aspirin should be avoided by those suffering from gout, unless specified by a qualified physician), vitamin C, tea and alcohol. The role of diuretics in triggering gout has been disputed.[43]
  • Moderate intake of purine-rich vegetables is not associated with increased gout.[20]

History

Writing ca. 30 AD, Aulus Cornelius Celsus appeared to recognize many of the features of gout, including its link with a urinary solute, late onset in women, linkage with alcohol, and perhaps even prevention by dairy products. [2] "Again thick urine, the sediment from which is white, indicates that pain and disease are to be apprehended in the region of joints or viscera." and "Joint troubles in the hands and feet are very frequent and persistent, such as occur in cases of podagra and cheiragra. These seldom attack eunuchs or boys before coition with a woman, or women except those in whom the menses have become suppressed. Upon the commencement of pain blood should be let; for when this is carried out at once in the first stages it ensures health, often for a year, sometimes for always. Some also, when they have washed themselves out by drinking asses' milk, evade this disease in perpetuity; some have obtained lifelong security by refraining from wine, mead and venery for a whole year; indeed this course should be adopted especially after the primary attack, even although it has subsided."

The Roman gladiatorial surgeon Galen described gout as a discharge of the four humors of the body in unbalanced amounts into the joints. The Latin term for a drop, as a drop of discharge, is gutta -- the term gout descends from this word.

See also

  • Pseudogout is a very similar disease, but caused by deposition of calcium pyrophosphate, not uric acid.

References

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Gout". A list of authors is available in Wikipedia.
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