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Gout

Highlights

Treatment and Management

Introduction

Gout is a painful and common type of arthritis. It is caused when there is too much uric acid in the blood. This is called hyperuricemia. Uric acid is a breakdown product of normal metabolism in the body and is normally excreted through urine. Buildup of uric acid results in needlelike crystals forming in the joints, soft tissues, and organs.

Cases of gout have increased in recent years. This increase is likely due to an aging population, dietary and lifestyle changes, the rising incidence of obesity, greater use of medicines, such as diuretics (water pills), all of which can lead to a high uric acid level in the body.

Click the icon to see an animation about gout.

Metabolism of Purines. The process leading to hyperuricemia and gout begins with the metabolism, or breakdown, of purines. Purines are compounds that are important for energy. Purines can be divided into two types:

The process of breaking down purines results in the formation of uric acid in the body. Most mammals, except humans, have an enzyme called uricase. Uricase breaks down uric acid so it can be easily removed from the body. Because humans lack uricase, uric acid is not easily removed and can build up in body tissues.

Uric Acid and Hyperuricemia. Purines in the liver are converted to uric acid. The uric acid enters the bloodstream. Most of the uric acid goes through the kidneys and is excreted in urine. The remaining uric acid travels through the intestines where bacteria help break it down.

Normally these processes keep the level of uric acid in the blood below 6.8 mg/dL. But sometimes the body produces too much uric acid or removes too little. In either case, the level of uric acid increases in the blood. This condition is known as hyperuricemia.

If uric acid reaches a level in the blood of 7 mg/dL or higher, it becomes insoluble and needlelike crystals of a salt called monosodium urate (MSU) may form. The higher the level of uric acid, the higher the risk of crystal formation. As crystals build up in the joints, they may trigger inflammation, redness, swelling, and pain. These are the symptoms of gout.

Symptoms

Symptoms of gout depend on the stage of the disease. Gout can be divided into four stages:

Asymptomatic means there are no symptoms. Increase in blood uric acid is the first stage of gout. This stage may last 30 years or more.

Note: Hyperuricemia does not always lead to gout. Less than 20% of people with hyperuricemia develeop gout. However, there is an association between hyperuricemia and the risk of hypertension, heart disease, and kidney disease. This association is being studied carefully since it might be possible to lower uric acid and reduce the risk of these diseases. At the moment, however, treating asymptomatic hyperuricemia is not recommended.

Acute gouty arthritis occurs when the first symptoms of gout appear. Sometimes the first signs of gout are brief twinges of pain (petit attacks) in an affected joint. These attacks can occur for several years before the full-blown condition occurs.

Symptoms of acute gouty arthritis often start in one joint and include any of the following:

Monoarticular Gout. Gout that occurs in one joint is called monoarticular gout. About 60% of all first-time monoarticular gout attacks in middle-aged adults occur in the big toe. This is known as podagra. Symptoms can also occur in other locations such as the ankle or knee.

Polyarticular Gout. If more than one joint is affected, the condition is known as polyarticular gout. Multiple joints are affected in only 10% to 20% of first attacks. Older people are more likely to have polyarticular gout. The most frequently affected joints are the foot, ankle, knee, wrist, elbow, and hand. The pain usually occurs in joints on one side of the body and it is usually, though not always, in the lower legs and the feet. People with polyarticular gout are more likely to have a slower onset of pain and a longer delay between attacks. People with polyarticular gout are also more likely to experience low-grade fever, loss of appetite, and a general feeling of poor health.

An untreated attack peaks 24 to 48 hours after symptoms first appear and goes away after 5 to 7 days. Some attacks last only hours, while others go on for as long as several weeks. Though symptoms can subside, the crystals are still present and future attacks are likely to occur.

Intercritical gout is the term used to describe the periods between attacks. The first attack is usually followed by a complete disappearance (remission) of symptoms. But, untreated, gout nearly always returns. Over two-thirds of patients  have at least one more attack within 2 years of the first attack. By 10 years, over 90% of patients who have one attack are likely to have more attacks.

Chronic Tophaceous Gout and Tophi. After several years, patients with elevated uric acid can develop deposits of uric acid called tophi. These are solid deposits of uric acid crystals that form in the joints, cartilage, bones, and elsewhere in the body. In some cases, tophi break through the skin and appear as white or yellowish-white, chalky nodules that have been described as looking like crab eyes.

Click the icon to see an image of tophi gout. 
Tophi gout in hand

Without treatment to lower the uric acid, tophi develop about 10 years after the onset of gout, although tophi and occur from 3 to 42 years after gout starts. Tophi are more likely to appear early in the course of the disease in older people. In the elderly, women are at higher risk of developing tophi than men. Persons who have had an organ transplant and are on the medicine cyclosporine also have a high risk of developing tophi.

Chronic Pain. When gout remains untreated, the periods between attacks of acute gout become shorter and shorter and the attacks, although sometimes less intense, can last longer. In about 10 to 20 years gout becomes a chronic disorder with constant low-grade pain and mild or acute inflammation. Gout may later affect several joints, including those that may have been free of symptoms at the start of the disorder. In rare cases, the shoulders, hips, or spine are affected.

Location of Tophi. Tophi may form in the following locations:

Tophi are usually painless. But they can cause pain and stiffness in the affected joint. In time, they can also damage cartilage and bone and destroy the joint. Large tophi under the skin of the hands and feet can cause severe deformities.

Uric Acid Nephrolithiasis (Kidney Stones). Persons who have kidney stones that formed from uric acid are more likely to have hyperuricemia which suggests hyperuricemia is responsible for this type of kidney stone. Uric acid stones can also form in a person who does not have gout or hyperuricemia.

Nephrolithiasis

Click the icon to see an image of nephrolithiasis.

Not all kidney stones in patients with gout are made of uric acid. Some are made of calcium oxalate, calcium phosphate, or substances combined with uric acid. Uric acid stones can also form in a person who does not have gout or hyperuricemia.

Chronic Uric Acid Interstitial Nephropathy. Chronic uric acid interstitial nephropathy occurs when crystals slowly form in the structures and tubes that carry fluid from the kidney. This condition can sometimes injure the kidneys.

Chronic Kidney Disease. For many years, hyperuricemia was not felt to cause kidney disease, but rather hyperuricemia was felt to be caused by the kidney disease. The question is now under careful review (see Asymptomatic Hyperuricemia).

Acute Kidney Failure. Sudden overproduction of uric acid can sometimes block the kidneys and cause them to fail. This occurrence is very rare but can develop after any of the following:

Causes and Risk Factors

Gout is considered either primary or secondary, depending on the causes of the high uric acid level in the blood (hyperuricemia).

Nearly all cases of primary gout cases are idiopathic. This means that the cause of the hyperuricemia cannot be determined. Primary gout is most likely the result of a combination of genetic, hormonal, and dietary factors. Secondary gout is caused by medicines or by medical conditions other than a metabolic disorder.

The following factors increase the risk of gout:

People with gout are at an increased risk of having metabolic syndrome. Metabolic syndrome is a collection of health problems, such as abdominal obesity, high blood pressure, and low "good" cholesterol. This syndrome increases a person's risk of heart disease and stroke. Therefore, lifestyle changes are an important aspect of preventing gout and improving overall health.

Each risk factor is discussed below.

Middle-Aged Adults. Gout usually occurs in men in the mid-40s. Men of this age group who have gout are often obese, have high blood pressure, unhealthy cholesterol levels, and drink large amounts of alcohol.

Elderly. Gout occurs equally in men and women. In this group, gout is most often associated with kidney problems and the use of diuretics. It is less often associated with alcohol use.

Children. Gout in children is uncommon except for rare inherited genetic disorders that cause hyperuricemia.

Men. Men are at much higher risk of gout than women. In men, uric acid level normally rises at puberty. In some  American men, the level is higher than normal, which means they have hyperuricemia. Gout symptoms appear after 20 to 40 years of persistent hyperuricemia. So men who develop gout usually experience their first attack between the ages of 30 and 50.

Women. Before menopause, women have a much lower risk of gout than men. This may be because estrogen causes more uric acid to be excreted by the kidneys. Only about 15% of gout cases in women occur before menopause. After menopause the risk increases. At age 60 the risk of gout in men and women is equal. After age 80, gout occurs more often in women.

About 20% of persons with gout have family histories of this condition. Several genes are linked to uric acid metabolism and gout. Some people have a defective protein (enzyme) that interferes with the way the body breaks down purines.

Scientists have found a clear link between body weight and uric acid level. The higher a person's weight (body mass index, or BMI), the higher the chance of developing gout. As a result, the risk of gout in many countries is rising because of the rising incidence of obesity. Children who are obese may have an increased risk of gout as adults.

Thiazide diuretic medicines, or water pills, are used to control high blood pressure (hypertension). These medicines are strongly linked to the development of gout. Many older patients who develop gout take diuretics.

Other medicines can also increase uric acid level and raise the risk of gout. These include:

Drinking excessive amounts of alcohol can raise the risk of gout. Beer is most strongly linked to gout, followed by spirits. Moderate wine intake does not seem to increase the risk of developing gout.

Alcohol use is highly associated with gout in younger adults. Binge drinking particularly increases uric acid level. Alcohol appears to play less of a role among elderly patients, especially among women with gout.

Alcohol increases uric acid level in the following three ways:

Long-term exposure to lead is associated with buildup of uric acid and a high incidence of gout. Some "moonshine" alcohol has elevated lead levels.

Persons who have had a kidney transplant have a high risk of gout. Other organ transplants, such as heart and liver, also increase the risk of gout. This is because the surgery itself raises the risk of gout, as does the medicine cyclosporine used to prevent rejection of the transplanted organ. Cyclosporine also interacts with indomethacin, a common gout medicine.

Kidney anatomy
The kidneys are responsible for removing waste from the body, regulating electrolyte balance and blood pressure, and stimulating red blood cell production.

Treatment of other conditions can lead to a high level of uric acid in the blood, resulting in a gout attack. These conditions include:

Triggers

Triggers are events or conditions that can set off a gout attack. Triggers include:

Diagnosis

The first step in diagnosing gout is to determine which joints are affected. A physical examination and medical history can help confirm or rule out gout. For example, gout is more likely if arthritis first appears in the big toe.

The speed of the onset of pain and swelling is also important. Symptoms that take days or weeks (rather than hours) to develop probably point to a problem other than gout.

Unusual enlargements in joints that had been affected by previous injury or osteoarthritis are possible signs of gout. This is especially true in older women who take diuretics (water pills).

Synovial fluid examination is the most accurate method for diagnosing gout. The synovial fluid is the lubricating liquid that fills the joint space (synovium). This is the membrane that surrounds a joint and creates a protective sac. The fluid cushions joints and supplies nutrients and oxygen to the cartilage surface that coats the bones. This exam also helps detect gout between attacks.

A procedure called arthrocentesis is performed. The health care provider uses a needle attached to a syringe to draw out fluid from the affected joint. This is called aspiration. The fluid sample is sent to a laboratory. If crystals of uric acid, also called monosodium urate (MSU) are found, this makes the diagnosis of gout. These crystals are very distinctive under the microscope using special polarizing filters. Aspiration sometimes eases symptoms by reducing swelling and pressure on the tissue surrounding the joint.

Joint aspiration
Synovial fluid analysis is a method to look at the fluid that cushions a joint. It is done to help diagnose and treat joint-related problems such as gout.

A blood test may be done to measure uric acid level in the blood. Since uric acid can fall during an attack, the uric acid may not be elevated at that time. Some doctors may wait until several days after the attack to order a blood test. Nearly all people with gout have elevated uric acid in this case, although not all people with elevated uric acid have gout. Therefore the blood uric acid is only one part of making the diagnosis.

Sometimes a urine test is done to check the amount of uric acid in a patient's urine. If uric acid in the urine is higher than a certain value, further tests for an enzyme defect or other cause of gout will be ordered. A high level of uric acid in the urine means that the patient is more likely to develop uric acid kidney stones.

Uric acid test

Click the icon to see an image of a uric acid test.

X-Rays. X-rays do not usually show problems during the early stages of gout. X-rays are more often used in chronic gout. X-rays may help find other problems with symptoms similar to gout. Tophi can be seen on x-rays before they can be found during a physical exam.

Advanced Imaging Techniques. In very rare cases, advanced imaging techniques are used for identifying tophi. These techniques include computed tomography (CT), magnetic resonance imaging (MRI), and Doppler ultrasonography.

As part of the diagnosis, other disorders that cause gout-like symptoms or cause hyperuricemia should be ruled out. In general, it is easy to distinguish acute gout that occurs in one joint from other arthritic conditions. The two disorders that may confuse this diagnosis are pseudogout and septic arthritis. Pseudogout is a condition most likely to be confused with gout.

Chronic gout can often resemble rheumatoid arthritis. Other conditions may at some point in their course resemble gout.

Pseudogout is also called calcic gout or calcium pyrophosphate dihydrate deposition disease. It is a common inflammatory arthritis in older adults. It is similar to gout. Like gout, pseudogout is caused by deposits of crystals in and around the joints. But the type of crystals of pseudogout is calcium pyrophosphate dihydrate (CPPD). These are quite different under the microscope compared to uric acid crystals.

Symptoms of pseudogout resemble gout in some ways, but there are differences:

Conditions that have a high risk of pseudogout in elderly patients include acute medical conditions, trauma, or surgery. Medical conditions linked to pseudogout include hypothyroidism, diabetes, gout, and osteoarthritis. Liver transplantation  may also increase the risk. X-rays often show calcium deposits in the joint cartilage. This is not seen in uric acid gout.

There is no cure for removing the calcium deposits that cause pseudogout. It is a progressive disorder that can eventually destroy joints. Treatments for acute attacks of pseudogout are similar to those for gout and are aimed at relieving the pain and inflammation and reducing the frequency of attacks.

Rheumatoid Arthritis. Rheumatoid arthritis can distort the joints of the finger and cause inflammation and pain that may be similar to gout. In older people, it is hard to tell chronic gout from rheumatoid arthritis. A proper diagnosis can be made with a detailed medical history, laboratory tests, and identification of MSU crystals.

Osteoarthritis. Gout can coincide and be confused with osteoarthritis in older people, particularly when it occurs in arthritic finger joints in women. In general, gout should be suspected if the joints in the fingertips are unusually enlarged.

Osteoarthritis

Click the icon to see an image of osteoarthritis.

Infections. Joint infections can have features that resemble gout. A correct diagnosis is important for proper treatment. A high fever and high white blood cell count help diagnose infection, while urate crystals in the joint usually point to gout.

Charcot Foot. People with diabetes who also have problems in the nerves in the feet (diabetic peripheral neuropathy) may develop Charcot foot or Charcot joint (medically known as neuropathic arthropathy). Early changes may resemble gout, with the foot becoming swollen, red, and warm, although it involves other parts of the foot other than the large toe.

Bunions. A bunion is a foot deformity that usually occurs at the joint at the base of the big toe. A bunion is actually a bony growth at the joint. It forms when the big toe is forced in toward the rest of the toes, causing the head of the first metatarsal bone to jut out and rub against the side of the shoe. The underlying tissue becomes inflamed, and a painful bump forms.

Bunion removal - series

Click the icon to see an illustrated series detailing bunion removal.

Treatment: Acute Gout Attack

Acute attacks of gout and long-term treatment of gout and hyperuricemia require different approaches. Treatment usually involves medication. After the first attack, some health care providers advise patients to keep a supply of medicines on hand to take at the first sign of symptoms of a second attack.

Treatments are prescribed for conditions associated with gout, including uric acid nephropathy and uric acid nephrolithiasis.

Supportive measures include applying ice and resting the affected joint.

Many patients do not require medication. Often lifestyle and dietary measures are enough to prevent attacks. Measures include not eating foods high in purines, not drinking alcohol, and maintaining a healthy weight.

Medicines for gout attacks are aimed at relieving pain and reducing inflammation. These include:

These medicines may be combined to treat a gout attack.

NSAIDs are the medicines of choice for an acute attack in younger, healthy patients with no serious health problems, such as disease of the kidneys, liver, or heart.

Many NSAIDs are available. Over-the-counter NSAIDs include ibuprofen, naproxen, and ketoprofen.

Indomethacin is a prescription NSAID. It is often the first choice of treatment. Usually 2 to 7 days of high-dose indomethacin is enough to treat a gout attack.

Regular use of NSAIDs can cause health problems, such as ulcers and gastrointestinal bleeding. Patients should follow instructions exactly on how much to take and for how long to avoid such health problems.

Patients with diabetes who take medicines to lower glucose by mouth may need to adjust their dosage if they also take NSAIDs. This is because of possible harmful interactions between these medicines.

Colchicine is a derivative of the autumn crocus (meadow saffron). It has been used for gout attacks for centuries. It is very effective in relieving a gout attack. It should not be used by elderly patients or those with kidney, liver, or bone marrow disorders. Colchicine may affect fertility. This medicine should not be used during pregnancy. Colchicine should be started soon after the gout attack begins and a total of only 3 tablets is currently recommended (2 tablets immediately and a 3rd tablet after 1 hour).

Certain medicines can interact with colchicine such as some antibiotics and stomach acid reducers (H2 blockers).

Patients should tell their doctor about all other medicines they are taking before being prescribed colchicine.

This term applies to people whose acute attack of gout occurs in multiple joints or in the presence of disease of the kidneys, heart, or in other conditions where using NSAIDs or colchicine should be avoided.

Corticosteroids may be used in patients who cannot tolerate NSAIDs such as the elderly or those with kidney disease. Corticosteroid injections into an affected joint provide relief for many patients. Steroids taken by mouth may be used for patients who cannot take NSAIDs or colchicine and who have gout in more than one joint.

These are new agents that target a key chemical released during acute gout called IL-1.

Anakinra, available by injection, has been found to be very helpful in treating difficult gout. It is not widely available and is expensive.

Canakinumab, not yet approved by the FDA, is also effective for acute, difficult gout.

Rilonacept (IL-1Trap) injection is being studied to see if it can help reduce gout flares during initiation of uric acid-lowering therapy (ULT) with allopurinol. More research is necessary to confirm the early positive results, its long term safety, and the patients most likely to benefit. It is not yet FDA approved.

Persons already taking urate-lowering medicine will likely continue taking this medicine during an attack. Starting a new urate lowering medicine should occur after the acute attack is under control.

Treatment: Preventing Attacks

After an acute attack some patients remain at high risk of another attack for several weeks during the intercritical period. Such patients include those with kidney insufficiency or those with congestive heart failure who are on diuretics. Colchicine or NSAIDs may be used for 1 to 2 months or longer to prevent another attack.

The cause of gout is hyperuricemia. Lifestyle changes should be recommended for all patients with gout, including weight loss if obese, dietary changes, and reducing alcohol intake. If the uric acid remains elevated in spite of these recommendations, medicine that lowers uric acid level in the blood or that block uric acid production to prevent gout attacks and other complications is usually prescribed.

Hyperuricemia that causes no symptoms may not need to be treated with medicine. Asymptomatic hyperuricemia often does not lead to gout or other health problems.

Before treatment, a 24-hour urine collection sample may be ordered for patients with frequent gout attacks. This is to determine whether they are over-producers or under-excreters of uric acid.

Low doses of NSAIDs or colchicine are used during several months after starting urate lowering medicine to prevent gout attacks.

Long-term treatment of hyperuricemia is now recommended for people who have had an attack of gout and any of the following:

There are several reasons people with gout and kidney disease should be started on urate lowering medications with only 1 attack of gout. They usually have hyperuricemia due to the kidney disease, treating acute gout is more difficult with kidney disease, and medicines such as allopurinol may protect the kidneys from worsening kidney disease.

First line recommended therapies to lower uric acid include allopurinol or febuxostat.

Allopurinol. Allopurinol decreases uric acid production by blocking an enzyme called xanthine oxidase. It is the drug most often used in long-term gout treatment for older patients, in patients with kidney disease, and those who overproduce uric acid.

When it is first started, allopurinol can trigger further attacks of gout. Therefore, a low dose is used first, and during the first months or longer, the patient also takes an NSAID or colchicine to reduce that possibility. Allopurinol is generally well tolerated but may cause side effects in some people, especially people of Chinese, Thai, or Korean heritage. A gene test called HLA B-5801 is recommended in such individuals before starting allopurinol.

Allopurinol has positive effects on hypertension, heart, and kidney disease, so it may be better than other medicines for patients with both gout and these conditions. Possible interactions with other medicines and allopurinol should be discussed with your physician before taking the medicine.

Febuxostat. Febuxostat is a newer drug and is particularly useful for patients who are allergic to allopurinol. Like allopurinol, it blocks xanthine oxidase, and gout may flare up after starting the medication. The FDA continues monitoring this drug for hypersensitivity reactions. It is much more expensive than allopurinol.

Uricosurics. Uricosurics are alternative first-line therapies. These drugs prevent the kidney from reabsorbing uric acid, and therefore, increase the amount excreted in the urine. They may be used when the kidneys are not eliminating enough uric acid which is present in about 80% of gout cases. The doctor will check a 24 hour urine to diagnose this problem. These medicines are not used for patients with reduced kidney function, or those with tophaceous gout.

Other patients who may benefit from uricosurics include:

NSAIDs, particularly aspirin and similar medicines, reduce the effectiveness of uricosurics. Patients taking uricosurics should avoid NSAIDs if possible.

Probenecid. Probenecid is an older medicine developed in the 50's, and the only uricosuric available in the United States. It may be useful in patients who cannot take other gout medications. It is generally well tolerated. New uricosuric medicines are being developed for gout and will most likely be available soon.

Pegloticase (Krystexxa, formerly Puricase). Pegloticase is an enzyme that breaks down uric acid so it is removed through the urine. Pegloticase injections are given intravenously every two weeks and are reserved for patients with severe chronic gout who have not been helped by first-line treatments. Mild to severe reactions are possible. The FDA recommends that an antihistamine and corticosteroid be given prior to the injection to prevent reactions and that other urate lowering medicines be stopped. Several side effects are possible, some of which can be severe. It has not been tested in patients with heart failure.

Starting medicines which lower uric acid can set off an attack of gout. You should work with your doctor to learn which medicines and dosages may cause gout flare-ups. In general, it is best to increase the dose slowly over many weeks. Also, you may need a medicine such as colchicine to prevent gout flares for the first several months after starting the urate lowering medicine. Your uric acid should be lowered to less than 6.0 mg/dL, and sometimes less than 5.0 mg/dL. Gout medications may interact with other drugs. Most people with gout will need to take the urate lowering medicine for the rest of their life.

People with gout have a high risk of high blood pressure (hypertension). Some medicines for hypertension, such as thiazide diuretics, can increase the risk of gout attacks. Other medicines, such as calcium channel blockers, may have beneficial effects on both high blood pressure and gout.

Surgery. Large tophi that are draining, infected, or interfering with the movement of joints may need to be surgically removed. Surgery may not be suitable for persons with other medical conditions such as infection. In most cases, measures such as taking medicines that lower uric acid should reduce the need for surgery.

Other types of surgeries are available to relieve joint pain and improve joint function. In some cases joint replacement is needed.

Rest and protecting the affected joint with a splint can also promote recovery. Applying ice packs during an acute attack can help relieve symptoms.

Lifestyle Changes

Uric acid level is only mildly affected by diet. Therefore, dietary therapy does not play a large role in preventing gout. Still, avoiding or reducing foods rich in purine can help.

Foods and drinks to avoid:

Foods and drinks to limit:

Eating a moderate amount of purine-rich vegetables (spinach, cauliflower, mushrooms, and legumes) does not seem to increase the risk of gout.

Dairy products, especially low-fat products, may actually protect against gout. Drinking coffee may also have a preventive effect against gout. Taking folic acid and vitamin C may reduce uric acid level.

Drinking plenty of water helps remove uric acid from the body.

Alcohol, especially beer and hard liquor, raises uric acid level, which can lead to gout attacks. This is why so many persons who drink an excessive amount of alcohol have gout attacks. Drinking wine occasionally does not seem to be linked to an increase in gout attacks.

Fructose-rich diets, including soda and fruit juice, may increase the risk of gout.

A supervised weight-loss program may be effective in reducing uric acid level in overweight persons. Crash dieting, though, can have the opposite effect because it can increase uric acid level, causing an acute attack.

Medications to treat other conditions can increase uric acid level. For example, certain diuretics (water pills) and low dose daily aspirin can affect uric acid level. Switching to alternative treatments may be necessary.

People with gout should avoid activities that cause repetitive joint trauma such as wearing tight shoes.

Travel may increase the risk of gout attacks. Travel not only increases stress, but eating and drinking patterns may change. Before traveling, patients should discuss preventive measures with their health care provider. The doctor may prescribe taking a corticosteroid at the first sign of a gout attack. In most cases, this stops the attack.

Complications

Properly treated gout by lowering uric acid to less than 6.0 is in effect "curable" and rarely poses a long-term health threat, though during an attack the pain can be disabling.

Left untreated, gout can develop into a painful and disabling chronic disorder. Persistent gout can destroy cartilage and bone. This causes deformed joints and loss of motion. If gout is not treated, tophi can grow to the size of golf balls and  destroy bone and cartilage in the joints. This is similar to the process in rheumatoid arthritis. In very severe cases, joint destruction results in complete disability.

Kidney Stones. Kidney stones can occur after the development of hyperuricemia. Although the stones are usually made of uric acid, they may also be mixed with other materials.

Nephrolithiasis

Kidney Disease. Patients with chronic hyperuricemia may develop chronic kidney disease, which may lead to kidney failure. This is because a constant high level or uric acid can damage the kidneys. Regardless of the cause, patients with kidney disease usually have hyperuricemia. Therefore, any patient with gout and hyperuricemia should be treated with urate lowering medication.

Gout is found in higher rates in people with high blood pressure, coronary artery disease, or heart failure. A high level of uric acid has been linked to a high risk of death from heart conditions. Studies have also found an association between gout and having metabolic syndrome. This is a collection of health problems, such as abdominal obesity, high blood pressure, high triglyceride levels, and low "good" cholesterol level. This syndrome increases a person's risk of heart disease and diabetes. Studies are being done to find out whether treating asymptomatic hyperuricemia in such people is beneficial.

Coronary artery blockage

 Click the icon to see an image of coronary artery blockage.     

Other conditions that are linked to long-term gout:

Resources

References

Burns CM, Wortmann RL. Clinical features and treatment of gout. In: Firestein GS, Budd RC, Gabriel SE, McInnes IB, O'dell JReds. Kelley's Textbook of Rheumatology. 9th ed. Philadelphia, PA: Elsevier Saunders; 2012:1554-1575e5.

Cameron M, Sakhaee K. Uric acid nephrolithiasis. Urol Clin N Am. 2007;34:335-346.

Choi HK, Ford ES, Li C, Curhan G. Prevalence of the metabolic syndrome in patients with gout: the Third National Health and Nutrition Examination Survey. Arthritis Rheum. 2007;57:109-115.

Choi HK, Willett W, Curhan G. Fructose-rich beverages and risk of gout in women. JAMA. 2010;304:2270-2278.

Doherty M. New insights into the epidemiology of gout. Rheumotology. 2009;48:ii2-ii8.

Doghramji PP, Edwards NL, McTigue J. Managing gout in the primary care setting: what you and your patients need to know. Am J Med. 2010;123:S2.

Goicoechea M, de Vinuesa SG, Verdalles U, et al. Effect of allopurinol in chronic kidney disease progression and cardiovascular risk. Clin J Am Soc Nephrol. 2010;5:1388-1393.

Janssens HJ, Fransen J, van de Lisdonk EH, et al. A diagnostic rule for acute gouty arthritis in primary care without joint fluid analysis. Arch Intern Med. 2010;170:1120-1126.

Johnson RJ, Nakagawa T, Jalal D, Sanchez-Lozada LG, Kang DH, Ritz E. Uric acid and chronic kidney disease: which is chasing which? Nephrol Dial Transplant. 2013; 28(9): 2221-2228.

Keenan RT, Nowatzky J, Pillinger MH. Etiology and pathogenesis of hyperuracemia and gout. In: Firestein GS, Budd RC, Gabriel SE, et al., eds. Kelley's Textbook of Rheumatology. 9th ed. Philadelphia, PA: Elsevier Saunders; 2012:1533-1553e5.

Keenan RT. Safety of urate-lowering therapies: managing the risks to gain the benefits. Rheum Dis Clin North Am. 2012:38(4):663-680. Review.

Khanna D, Fitzgerald JD, Khanna PP, et al. 2012 American College of Rheumatology Guidelines for Management of Gout. Part 1: Systematic Nonpharmacologic and Pharmacologic Therapeutic Approaches to Hyperurecemia. Arthrit Care Res. 2012;64:1431-1446.

Khanna D, Khanna PP, Fitzgerald JD, et al. 2012 American College of Rheumatology Guidelines for Management of Gout. Part 2: Therapy and Antiinflammatory Prophylaxis of Acute Gouty Arthritis. Arthrit Care Res. 2012;64:1447-1461.

Li S, Michelletti R. Role of diet in rheumatic disease. Rheum Dis Clin N Am. 2011;37:119-133.

Lebiedz-Odrobina D, Kay J. Rheumatic manifestations of diabetes mellitus. Rheum Dis Clin N Am. 2010;36:681-699.

Maynard JW, McAdams DeMarco MA, et al. Incident gout in women and association with obesity in the Atherosclerosis Risk in Communities (ARIC) study. Am J Med. e2012;125:717.e9-717.e17.

Mitha E, Schumacher HR, Fouche L, et al. Rilonacept for gout flare prevention during initiation of uric acid-lowering therapy: results from the PRESURGE-2 international, phase 3, randomized, placebo-controlled trial. Rheumatology (Oxford). 2013;52(7):1285-1292.

Moi JH, Sriranganathan MK, Edwards CJ, Buchbinder R. Lifestyle interventions for chronic gout. Cochrane Database Syst Rev. 2013;5:CD010039.

Neogi T. Clinical practice. Gout. N Engl J Med. 2011;364(5):443-452.

Nguyen S, Choi HK, Lustig RH, Hsu CY. Sugar-sweetened beverages, serum uric acid, and blood pressure in adolescents. J Pediatr. 2009;154:807-813.

Richette P, Bardin T. Gout. Lancet. 2010;375(9711):318-328.

Wechalekar MD, Vinik O, Schlesinger N, Buchbinder R. Intra-articular glucocorticoids for acute gout. Cochrane Database Syst Rev. 2013;4:CD009920.

Zhu YY, Pandya BJ, Choi HK. Comorbidities of gout and hyperuricemia in the US general population: NHANES 2007-2008. Am J Med. 2012;125:679-687.



Review Date: 3/29/2014
Reviewed By: Gordon A. Starkebaum, MD, Professor of Medicine, Division of Rheumatology, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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