Uric Acid Metabolism Disorder: Causes and Treatment
A uric acid metabolism disorder occurs when uric acid levels in the blood are persistently too high or too low, potentially leading to conditions such as gout or kidney stones.
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A uric acid metabolism disorder occurs when uric acid levels in the blood are persistently too high or too low, potentially leading to conditions such as gout or kidney stones.
What Is a Uric Acid Metabolism Disorder?
A uric acid metabolism disorder is a medical condition in which the body is unable to maintain normal uric acid balance. Uric acid is a waste product formed during the breakdown of purines -- naturally occurring substances found in the body and in many foods. When too much uric acid is produced or too little is excreted by the kidneys, uric acid levels in the blood rise -- a condition known as hyperuricemia. Less commonly, certain disorders can cause abnormally low uric acid levels, referred to as hypouricemia.
Causes
The causes of uric acid metabolism disorders can be divided into primary (genetic) and secondary (acquired) forms:
Primary Causes
- Genetic enzyme defects: Inherited disorders of purine metabolism, such as a deficiency of hypoxanthine-guanine phosphoribosyltransferase (HGPRT), lead to excessive uric acid production.
- Lesch-Nyhan syndrome: A rare, X-linked inherited disease caused by severe HGPRT deficiency.
Secondary Causes
- Diet: High intake of purine-rich foods such as red meat, organ meats, shellfish, and alcohol (especially beer) increases uric acid production.
- Kidney disease: Impaired kidney function reduces the excretion of uric acid.
- Metabolic syndrome: Obesity, high blood pressure, elevated blood lipids, and insulin resistance all promote hyperuricemia.
- Medications: Certain diuretics and immunosuppressants can raise uric acid levels.
- Rapid cell breakdown: In cancer or after chemotherapy, the large-scale death of cells releases significant amounts of uric acid.
Symptoms
Many people with elevated uric acid levels have no symptoms initially. When symptoms do occur, they may include:
- Gout attack: Sudden, severe joint pain, most commonly in the big toe (podagra), but also in the knee, ankle, or wrist. The affected joint is swollen, red, and warm to the touch.
- Tophi: Deposits of uric acid crystals under the skin, particularly around the ears, fingers, and feet.
- Kidney stones: Uric acid crystals can accumulate in the kidneys, causing painful renal colic.
- Kidney damage: Chronically elevated uric acid can impair long-term kidney function.
Diagnosis
Diagnosis of a uric acid metabolism disorder involves several tests:
- Blood test: Measurement of serum uric acid levels. Normal values are below 7.0 mg/dL in men and below 6.0 mg/dL in women.
- Urine test: A 24-hour urine collection to measure uric acid excretion and distinguish overproduction from underexcretion.
- Joint aspiration: If gout is suspected, joint fluid can be examined under a microscope for uric acid crystals.
- Imaging: Ultrasound or dual-energy CT can detect uric acid crystal deposits in joints and soft tissues.
- Genetic testing: Considered when an inherited metabolic disorder is suspected.
Treatment
Treatment depends on the underlying cause, severity, and any associated conditions:
Lifestyle Measures
- Reduce intake of purine-rich foods (organ meats, game, shellfish)
- Avoid alcohol, especially beer
- Drink plenty of water (at least 2 liters per day)
- Achieve and maintain a healthy body weight
- Engage in regular physical activity
Medical Treatment
- Acute gout attack: Non-steroidal anti-inflammatory drugs (NSAIDs), colchicine, or corticosteroids to relieve pain and reduce inflammation.
- Long-term management of hyperuricemia: Urate-lowering therapies such as allopurinol (which inhibits uric acid production) or febuxostat (also a xanthine oxidase inhibitor). Uricosuric agents such as benzbromarone promote uric acid excretion via the kidneys.
- Hypouricemia: Treatment targets the underlying cause.
Prognosis and Outlook
With consistent treatment and lifestyle adjustments, uric acid metabolism disorders can generally be well controlled. If left untreated, the condition can progress to chronic gout, permanent joint damage, kidney stones, and kidney failure. Regular medical monitoring of uric acid levels is therefore essential.
References
- Richette P, Doherty M et al. - 2016 updated EULAR evidence-based recommendations for the management of gout. Annals of the Rheumatic Diseases, 2017; 76(1):29-42.
- Merriman TR, Dalbeth N. - The genetic basis of hyperuricaemia and gout. Joint Bone Spine, 2011; 78(1):35-40.
- Khanna D et al. - 2012 American College of Rheumatology Guidelines for Management of Gout. Arthritis Care and Research, 2012; 64(10):1431-1461.
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