Medical Education Library

The Treatment of Gout

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References

DISCLOSURES

Dr. Ruoff has disclosed that he is on the speakers’ bureau for and has received research grants from Takeda Pharmaceuticals.

SUPPORT

This program is sponsored by the PCEC and is supported by funding from URL Pharma, Inc.

DB is a 50-year-old obese male visiting the clinic for symptoms suggestive of allergic rhinitis. The nurse has informed the family physician that DB was limping from the waiting room to the examination room. DB reports that he has been experiencing pain in his left big toe and ankle over the past few days. The last time this happened, the pain resolved within 7 to 10 days.

DB reports that he has experienced 4 or 5 similar episodes over the past 3 years. The first attacks affected his left big toe, but he now also experiences some pain in his left ankle. The pain is moderate, peaks in 1 to 2 days, and resolves within 7 to 10 days. Acetaminophen provided little pain relief so DB now takes ibuprofen 400 mg 3 times daily, as it “helps take the edge off.” Other medications include aspirin 81 mg per day and an oral antihistamine as needed for hay fever. DB reports that he eats seafood 2 to 3 times per week and red meat 1 to 2 times per week; he drinks 2 six-packs of beer per week.

Physical examination: weight, 186 lb (body mass index [BMI], 27 kg/m2); blood pressure, 126/76 mm Hg; and temperature, 98.8°F. His left big toe and ankle are red, slightly swollen, and warm with a small subcutaneous nodule noted on the first metatarsophalangeal joint. There is no sign of skin or joint infection.

The impression from his history and physical exam is that DB is suffering from an acute attack of gout, but the family physician also considers other diagnoses.

Background

Gout is a heterogeneous disorder that peaks in incidence in the fifth decade. Gout is caused by hyperuricemia, generally as a result of reduced excretion of uric acid by the kidneys; hyperuricemia may also result from overproduction of uric acid. Data from the National Health and Nutrition Examination Survey (NHANES) 2007-2008 indicate that the prevalence of gout continues to rise in the United States, likely related to the increasing frequency of adiposity and hypertension. Overall, about 75% of the 8.3 million people with gout are men.1

Risk Factors

Clinically defined hyperuricemia—a serum urate (sUA) level greater than 6.8 mg/dL, the concentration at which urate exceeds its solubility in most biological fluids—is the major risk factor for gout. However, not all persons with hyperuricemia have gout. Data from NHANES 2007-2008, in which the definition of hyperuricemia was an sUA level greater than 7.0 mg/dL for men and greater than 5.7 mg/dL for women, showed the mean sUA level to be 6.1 mg/dL in men and 4.9 mg/dL in women, corresponding to hyperuricemia prevalences of 21.2% and 21.6%, respectively.1

There are several other risk factors for gout, including hypertension, diabetes, hyperlipidemia, chronic kidney disease, cardiovascular disease (CVD), and metabolic syndrome.2 For a man with hypertension, the relative risk (RR) of gout is 2.3 compared with a normotensive man.3 Furthermore, it is well established that the use of diuretics increases the risk of gout (RR, 1.8).3 Several other medications increase sUA level as well: aspirin (including low-dose), cyclosporine, pyrazinamide, ethambutol, and niacin.2

Lifestyle and diet also pose a risk for gout. The risk of gout increases with BMI such that, compared with a man with a BMI of 21 to 22.9 kg/m2, the RR of gout is doubled for a man with a BMI of 25 to 29.9 kg/m2; for a man with a BMI of 35 kg/m2 or more, the RR is tripled.3 Sugar-sweetened soft drinks (but not diet soft drinks) and fructose-rich fruits and fruit juices also increase the risk of gout, as do a high alcohol intake, particularly beer, and a diet rich in meat (especially organ meat, turkey, or wild game) or seafood.4 A moderate intake of purine-rich vegetables (eg, peas, beans, lentils, spinach, mushrooms, oatmeal, and cauliflower) or protein is not associated with an increased risk of gout, while a high consumption of dairy products is associated with a decreased risk.5,6

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