The
following information on gout is provided by the
National Institute of Arthritis and Musculoskeletal and
Skin Diseases (NIAMS) /National Institutes of Health (NIH).
This information on gout provides an overview of the
condition, along with info on gout treatment and
prevention.
Information on Gout / Info on Gout: What Is Gout?
Gout is one of the most painful rheumatic diseases. It
results from deposits of needle-like crystals of uric
acid in connective tissue, in the joint space between
two bones, or in both. These deposits lead to
inflammatory arthritis, which causes swelling, redness,
heat, pain, and stiffness in the joints. The term
arthritis refers to more than 100 different rheumatic
diseases that affect the joints, muscles, and bones, as
well as other tissues and structures. Gout accounts for
approximately 5 percent of all cases of arthritis.
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Pseudogout is sometimes confused with gout because it
produces similar symptoms of inflammation. However, in
this condition, also called chondrocalcinosis, deposits
are made up of calcium phosphate crystals, not uric
acid. Therefore, pseudogout is treated somewhat
differently and is not reviewed in this booklet.
Uric acid is a substance that results from the breakdown
of purines, which are part of all human tissue and are
found in many foods. Normally, uric acid is dissolved in
the blood and passed through the kidneys into the urine,
where it is eliminated. If the body increases its
production of uric acid or if the kidneys do not
eliminate enough uric acid from the body, levels of it
build up in the blood (a condition called
hyperuricemia). Hyperuricemia also may result when a
person eats too many high-purine foods, such as liver,
dried beans and peas, anchovies, and gravies.
Hyperuricemia is not a disease and by itself is not
dangerous. However, if excess uric acid crystals form as
a result of hyperuricemia, gout can develop. The excess
crystals build up in the joint spaces, causing
inflammation. Deposits of uric acid, called tophi
(singular: tophus), can appear as lumps under the skin
around the joints and at the rim of the ear. In
addition, uric acid crystals can collect in the kidneys
and cause kidney stones.
For many people, gout initially affects the joints in
the big toe. Sometime during the course of the disease,
gout will affect the big toe in about 75 percent of
patients. It also can affect the instep, ankles, heels,
knees, wrists, fingers, and elbows. The disease can
progress through four stages:
Asymptomatic (without symptoms) hyperuricemia--In this
stage, a person has elevated levels of uric acid in the
blood but no other symptoms. A person in this stage does
not usually require treatment.
Acute gout, or acute gouty arthritis--In this stage,
hyperuricemia has caused the deposit of uric acid
crystals in joint spaces. This leads to a sudden onset
of intense pain and swelling in the joints, which also
may be warm and very tender. An acute attack commonly
occurs at night and can be triggered by stressful
events, alcohol or drugs, or the presence of another
illness. Early attacks usually subside within 3 to 10
days, even without treatment, and the next attack may
not occur for months or even years. Over time, however,
attacks can last longer and occur more frequently.
Interval or intercritical gout--This is the period
between acute attacks. In this stage, a person does not
have any symptoms and has normal joint function.
Chronic tophaceous gout--This is the most disabling
stage of gout and usually develops over a long period,
such as 10 years. In this stage, the disease has caused
permanent damage to the affected joints and sometimes to
the kidneys. With proper treatment, most people with
gout do not progress to this advanced stage.
Information on Gout / Info on Gout: What Causes Gout?
A number of risk factors are related to the development
of hyperuricemia and gout:
_ Genetics may play a role in determining a person's
risk, since up to 18 percent of people with gout have a
family history of the disease.
_ Gender and age are related to the risk of developing
gout; it is more common in men than in women and more
common in adults than in children.
_ Being overweight increases the risk of developing
hyperuricemia and gout because there is more tissue
available for turnover or breakdown, which leads to
excess uric acid production.
_ Drinking too much alcohol can lead to hyperuricemia
because it interferes with the removal of uric acid from
the body.
_ Eating too many foods rich in purines can cause or
aggravate gout in some people.
_ An enzyme defect that interferes with the way the body
breaks down purines causes gout in a small number of
people, many of whom have a family history of gout.
_ Exposure to lead in the environment can cause gout.
Some people who take certain medicines or have certain
conditions are at risk for having high levels of uric
acid in their body fluids. For example, the following
types of medicines can lead to hyperuricemia because
they reduce the body's ability to remove uric acid:
_ Diuretics, which are taken to eliminate excess fluid
from the body in conditions like hypertension, edema,
and heart disease, and which decrease the amount of uric
acid passed in the urine;
_ Salicylates, or anti-inflammatory medicines made from
salicylic acid, such as aspirin;
_ The vitamin niacin, also called nicotinic acid;
_ Cyclosporine, a medicine used to suppress the body's
immune system (the system that protects the body from
infection and disease) and control the body's rejection
of transplanted organs; and
_ Levodopa, a medicine used to support communication
along nerve pathways in the treatment of Parkinson's
disease.
Information on Gout / Info on Gout: Who Is Likely To
Develop Gout?
Gout occurs in approximately 840 out of every 100,000
people. It is rare in children and young adults. Adult
men, particularly those between the ages of 40 and 50,
are more likely to develop gout than women, who rarely
develop the disorder before menopause. People who have
had an organ transplant are more susceptible to gout.
Information on Gout / Info on Gout: How Is Gout
Diagnosed?
Gout may be difficult for doctors to diagnose because
the symptoms may be vague, and they often mimic other
conditions. Although most people with gout have
hyperuricemia at some time during the course of their
disease, it may not be present during an acute attack.
In addition, having hyperuricemia alone does not mean
that a person will get gout. In fact, most people with
hyperuricemia do not develop the disease.
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To
confirm a diagnosis of gout, a doctor may insert a
needle into an inflamed joint and draw a sample of
synovial fluid, the substance that lubricates a joint. A
laboratory technician places some of the fluid on a
slide and looks for monosodium urate crystals under a
microscope. Their absence, however, does not completely
rule out the diagnosis. The doctor also may find it
helpful to examine chalky, sodium urate deposits (tophi)
around joints to diagnose gout. Gout attacks may mimic
joint infections, and a doctor who suspects a joint
infection (rather than gout) may check for the presence
of bacteria.
Information on Gout/ Info on Gout: Signs and Symptoms of
Gout
_ Hyperuricemia
_ Presence of uric acid crystals in joint fluid
_ More than one attack of acute arthritis
_ Arthritis that develops in 1 day, producing a swollen,
red, and warm joint
_ Attack of arthritis in only one joint, usually the
toe, ankle, or knee
Information on Gout/Info on Gout: How Is Gout Treated?
With proper treatment, most people with gout are able to
control their symptoms and live productive lives. Gout
can be treated with one or a combination of therapies.
The goals of treatment are to ease the pain associated
with acute attacks, to prevent future attacks, and to
avoid the formation of tophi and kidney stones.
Successful treatment can reduce both the discomfort
caused by the symptoms of gout and long-term damage of
the affected joints. Treatment will help to prevent
disability due to gout.
The most common treatments for an acute attack of gout
are high doses of nonsteroidal anti-inflammatory drugs
(NSAIDs) taken orally (by mouth) or corticosteroids,
which are taken orally or injected into the affected
joint. NSAIDs reduce the inflammation caused by deposits
of uric acid crystals but have no effect on the amount
of uric acid in the body. The NSAIDs most commonly
prescribed for gout are indomethacin (Indocin*) and
naproxen (Anaprox, Naprosyn), which are taken orally
every day. Corticosteroids are strong anti-inflammatory
hormones. The most commonly prescribed corticosteroid is
prednisone. Patients often begin to improve within a few
hours of treatment with a corticosteroid, and the attack
usually goes away completely within a week or so.
When NSAIDs or corticosteroids do not control symptoms,
the doctor may consider using colchicine. This drug is
most effective when taken within the first 12 hours of
an acute attack. Doctors may ask patients to take oral
colchicine as often as every hour until joint symptoms
begin to improve or side effects such as nausea,
vomiting, abdominal cramps, or diarrhea make it
uncomfortable to continue the drug.
For some patients, the doctor may prescribe either
NSAIDs or oral colchicine in small daily doses to
prevent future attacks. The doctor also may consider
prescribing medicine such as allopurinol (Zyloprim) or
probenecid (Benemid) to treat hyperuricemia and reduce
the frequency of sudden attacks and the development of
tophi.
Information on Gout/ Info on Gout: What Can People With
Gout Do To Stay Healthy?
To help prevent future attacks, take the medicines your
doctor prescribes. Carefully follow instructions about
how much medicine to take and when to take it. Acute
gout is best treated when symptoms first occur.
_ Tell your doctor about all the medicines and vitamins
you take. He or she can tell you if any of them increase
your risk of hyperuricemia.
_ Plan followup visits with your doctor to evaluate your
progress.
_ Maintain a healthy, balanced diet; avoid foods that
are high in purines; and drink plenty of fluids,
especially water. Fluids help remove uric acid from the
body.
_ Exercise regularly and maintain a healthy body weight.
Lose weight if you are overweight, but do not go on
diets designed for quick or extreme loss of weight
because they increase uric acid levels in the blood.
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