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| Gout (podagra or uric acid) |
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Reviewed by Dr Badal Pal, consultant rheumatologist
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What is gout?
Gout, otherwise known as
podagra or uric acid arthropathy is a rheumatic complaint,
that usually attacks a single joint at a time.
The disease has a preference for the big toe of middle-aged men
- it swells, turns red and becomes sore. The soreness is such that just walking
through a room can cause severe pain.
It is more common in men than women by a factor of 10 to 1.
What is the cause of gout?
The disease is caused by the deposition of sodium urate (uric
acid) crystals in the joints. Uric acid is a by-product of the body's
metabolism.
Normally the uric acid is removed when urinating, but among
patients with a predisposition for gout, the uric acid accumulates in the
blood.
Among some of these patients, the concentration in the blood is
so high that the uric acid 'overflows' and settles in the joints and
possibly in the skin.
How do you get gout?
The are two kinds of gout.
Primary hyperuricaemia and gout
Hyperuricaemia means an increased level of uric acid in the
blood. It is usually caused by an hereditary abnormality in the system that
changes the nucleic acid into uric acid. In this case the body is incapable of
excreting uric acid fast enough even during normal circumstances.
Secondary hyperuricaemia and gout
Is caused by another disease or because of consumption of
certain medicines (eg diuretic preparations, which increase the output of
urine, and acetylsalicylic acid derivatives including aspirin). In these cases,
the problem is that the body produces such large quantities of uric acid that
the kidneys cannot keep up.
What are the signs of gout?
Prior to the onset of symptoms of gout, there is usually a
latent period of several years in which the concentration of uric acid in the
blood has gradually increased. This condition is called asymptomatic
hyperuricaemia.
Some 95 per cent of the people with this condition never develop
gout.
The first gout attack is often at night. Typically, the
afflicted person wakes up in the middle of the night with extreme pain near the
joint of the big toe (if the pain is in the knee it is called gonagra). The
joint is swollen and may turn a shining purple.
Even the smallest stimuli produce severe pain, for instance a
blanket on the toe. The first attack usually subsides after about a week.
About 10 per cent of sufferers will never again experience gout
whereas others will experience more frequent and longer lasting attacks if they
are not treated.
If it is not treated, repeated cases of gout over several years
can produce permanent damage in the joint.
If no preventive treatment is undertaken, over time, sodium
urate will collect under the skin. In this case the crystals are seen as small
bumps near the joints or on the outer side of the ear called tophi.
Occasionally they rupture or ooze out yellowish chalky
materials.
Who is at most risk?
Gout attacks are brought on by several factors including:
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overconsumption of alcohol, especially beer.
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some foods with a high content of protein and purines, such as
liver, kidneys, sardines, and anchovies.
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being overweight.
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haemorrhages in the gastrointestinal canal.
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bodily trauma with extensive tissue destruction.
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major surgery.
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conditions in which there is a high rate of cell turnover, eg
leukaemia,
lymphoma,
psoriasis.
Good advice
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Cut down on alcohol consumption.
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Avoid food that you know can cause attacks.
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Watch your weight.
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The uric acid crystals can be secreted in the urinary system as
calculi (stones). Therefore you have to drink plenty of water, preferably 10 to
12 glasses a day, in order to wash out the urinary system and prevent any
stones from developing.
How does the doctor diagnose gout?
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The diagnosis is usually made from the way the patient presents
the symptoms, plus the clinical picture.
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In order to rule out other rheumatic complaints, the doctor
will usually take a
blood sample to
measure the concentration of uric acid. He may also undertake an
X-ray examination and
an examination of the synovial fluid (found within joints), where uric crystals
will be visible by using special equipment.
Future prospects
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About 60 per cent of the people who experience a gout attack
will have a similar or more severe attack within the next year.
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The disease can become complicated with calculi (stones) in the
urinary system.
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With modern treatment it has become much easier to relieve
gout.
How is gout treated?
Treatment is concentrated on three areas:
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during the actual attack the most important thing is to soothe
the pain with non-steroidal anti-inflammatory drugs (ordinary analgesics like
paracetamol will not relieve the pain, and aspirin must not be used).
Colchicine is used
to relieve the pain in people who cannot take NSAIDs.
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once the attack has passed, you are offered
preventive treatment, usually with
allopurinol (eg Zyloric), which
will reduce the level of uric acid in the blood. The preventive treatment can -
if it is used during an active attack of gout - actually aggravate an attack,
because it causes a large quantity of uric acid to be released at the same
time.
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finally it is important to change your lifestyle, as described
above.
The goals of the treatment are to remove the pain and the
swelling, prevent further episodes, prevent and treat tophi and to stop the
production of stones in the urinary system.
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Based on a text by Dr Flemming Andersen
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Last updated 01.04.2005
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