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A literature review of the epidemiology and treatment of acute gout.

BACKGROUND: Gout is the most common cause of inflammatory arthritis in men aged >40 years and is frequently encountered in clinical practice. OBJECTIVE: The goal of this article was to review the published literature on the epidemiology, treatment, and estimated burden of illness of acute gout. METHODS: Articles on gout published in English between 1980 and June 2002 were identified through a MEDLINE search. Relevant clinical studies and review articles were found using the text- and keyword-search term gout alone and in combination with epidemiology, prevalence, incidence, complications, outcome, quality of life, economics, cost, prevention or drug therapy. The reference lists of identified articles, especially review articles, were checked for any additional studies that might have been missed in the original MEDLINE search. RESULTS: The epidemiology of gout in various geographic regions has been well documented. Data suggest that environmental, racial, and hereditary factors may influence the development of gout, and that the prevalence of gout appears to be on the rise worldwide. Evidence from well-designed clinical studies evaluating drug therapies for gout is limited. Therapies for acute gout include corticotropin, corticosteroids, colchicine or, more often, nonsteroidal anti-inflammatory drugs (NSAIDs), which have shown comparable efficacy. A recent study suggests that etoricoxib, a new cyclooxygenase-2-selective inhibitor, may be as effective as and better tolerated than traditional NSAIDs in the treatment of gout. Urate-lowering therapy, prophylactic colchicine, and low-dose NSAIDs are used for the long-term prophylaxis of gout. However, all acute and prophylactic therapies are associated with adverse events. Using an economic model for gout, the annual direct burden of illness for new cases of acute gout can be estimated at 27,378,494 US dollars in the United States. CONCLUSIONS: Gout is an increasingly prevalent condition worldwide and creates a heavy economic burden. Available treatments are generally effective; however, they are not devoid of adverse events. Well-designed, long-term, controlled clinical trials evaluating the comparative efficacy and tolerability of treatments for gout are needed.

Acute Disease↗

Purine metabolism in women with primary gout.

PURPOSE: Uncontrolled studies have shown that women with gout have higher serum urate concentrations and similar or lower urinary uric acid excretion rates than do men with gout. These observations suggest a more defective tubular transport of uric acid in women than in men with gout. In this prospective study we assessed purine metabolism in women with primary gout under controlled conditions. We also examined whether there are sex-related differences in plasma and urinary purine concentrations among patients with primary gout. SUBJECTS AND METHODS: Ten women with crystal-proved primary gout and normal serum creatinine levels (below 116 mmol/L) were studied while they were on a purine-restricted diet and taking no medications known to influence uric acid metabolism. For comparison, 20 men with primary gout and 10 women without gout, matched for age, race, and body mass index, were studied under the same conditions. In each subject, plasma and 24-hour urinary uric acid, hypoxanthine, and xanthine concentrations were measured. The mean of three consecutive determinations for plasma purines and five for urinary purines was used. Standard formulas were used to calculate the renal clearances and the fractional excretion of purines. RESULTS: Mean plasma urate, hypoxanthine, and xanthine levels were significantly higher in women patients with primary gout compared with normal women (P < 0.05). Mean 24-hour urinary uric acid excretion was similar in both groups. Daily urinary hypoxanthine and xanthine excretion rates were significantly lower in gouty women patients than in control women (P < 0.05). The renal clearances and the fractional excretion of uric acid, hypoxanthine, and xanthine were markedly lower in women with primary gout than in control women (P < 0.05). Plasma and urinary purine concentrations were similarly increased and diminished, respectively, in women and men patients with primary gout. Plasma urate, hypoxanthine, and xanthine levels were inversely and significantly associated with the fractional excretion of uric acid (r = -0.520; P = 0.003), hypoxanthine (r = -0.555; P = 0.002), and xanthine (r = -0.384; P = 0.040), respectively. CONCLUSION: Women with primary gout have markedly diminished uric acid, hypoxanthine, and xanthine excretion rates. The disturbance of purine metabolism appears to be of a similar magnitude to that observed in gouty men. The absence of significant sex-related differences in plasma and urinary purine concentrations suggests a similar tubular dysfunction for purine excretion in women and men with primary gout.

Aged↗

Gout in renal transplant recipients.

AIMS: The aims of the present audit were to determine the prevalence of gout in renal transplant recipients in Canterbury, New Zealand, to identify risk factors for gout, and to assess the range of treatments used, their efficacy and complications. In addition, the authors wished to assess the impact of post-renal transplant gout on the patient. METHODS: Patients with post-transplantation gout were identified from the Christchurch Hospital Nephrology database. For each patient with gout a post-renal transplantation recipient without gout post transplant was found matched for age, sex and date of transplant. Case notes were audited and patients interviewed. RESULTS: In total, 47/202 (23%) living renal transplant recipients had gout post transplant. Those patients with gout were more likely to be taking a loop diuretic (68%vs 34%, P < 0.001), to have a higher serum urate and impaired renal function and to have had gout prior to the transplant. Of those patients who developed gout post transplant 70% had an attack at least every 3 months. Of those who returned to work post transplant 48% required time off work because of gout. CONCLUSION: out is an important problem in the post-transplant population causing significant morbidity and time off work. Diuretics, impaired renal function, gout prior to transplantation and hyperuricaemia are important risk factors. The need for diuretic therapy should be kept under review in these patients. Hypouricaemic therapy should be considered early in those who develop gout post renal transplantation. Further studies are required to determine whether treatment for asymptomatic hyperuricaemia is justified.

Adult↗

Characteristics of chronic gout in Northern Sulawesi, Indonesia.

OBJECTIVE: To identify associations and possible risk factors for gout that may contribute to chronic tophaceous gout in rural and urban districts of North Sulawesi, Indonesia. METHODS: A total of 190 patients with chronic gout and 190 age and sex matched controls were selected from 28 community health centers. Potential risk factors including alcohol consumption, food habits, family history, body weight, related medical conditions, drug use, and laboratory investigations were sought. RESULTS: Alcohol consumption and certain food habits were associated with gout. A positive family history of gout and overweight were also significant risk factors. Renal impairment was found in 86.3% of patients and hyperuricemia in 92.1%. In controls, renal impairment and hyperuricemia were 7.4% and 32.6%, respectively. Patients with hypertension and nephrolithiasis were more at risk of having associated gout. There was a significant association between gout, hyperuricemia, hypercholesterolemia, hypertriglyceridemia, and higher levels of creatinine and urea. There was also a significantly lower level of urine uric acid in gout cases compared with controls. Gouty tophi were found in 91% of these cases with chronic gout. The use of diuretics for treating hypertension, continuing excessive alcohol consumption and purine-rich food habits in untreated gout, and hyperuricemia were associated with chronic and tophaceous gout. Urate-lowering drugs were not available in the community health centers. CONCLUSION: Severe tophaceous gout with deformities and disability is found in North Sulawesi. Prominent risk factors include alcohol, obesity, renal impairment, diet, hypertension, and family history. Improved education about gout seems needed. Urate-lowering drugs are not available in community health centers but are needed, especially in rural areas, as studied here.

Demography↗

Gout and allopurinol adherence in newly diagnosed patients and the risk of fractures: a nationwide cohort study.

INTRODUCTION / OBJECTIVES: The association between gout and fractures remains controversial due to the competing effects of uric acid's antioxidant properties and gout-induced chronic inflammation. Our study aimed to evaluate the risk of fractures in newly diagnosed gout patients and to analyze the impact of Allopurinol medication adherence on this risk. METHODS: This nationwide cohort study utilized the National Health Insurance Service-National Health Screening Cohort (NHIS-HEALS) database (2002-2019). We identified 4,107 patients newly diagnosed with gout who remained on continuous allopurinol therapy during the 24-month medication assessment period and matched them 1:3 with 12,321 non-gout controls using propensity score matching. Allopurinol adherence was assessed via the Medication Possession Ratio (MPR) over a 24-month period and categorized into three groups: MPR&#x2009;<&#x2009;0.3, 0.3&#x2009;&#x2264;&#x2009;MPR&#x2009;<&#x2009;0.8, and MPR&#x2009;&#x2265;&#x2009;0.8. Multivariable Cox proportional hazards regression was used to calculate adjusted hazard ratios (aHR) and 95% confidence intervals (CI) for fractures (vertebral, hip, and distal radius). RESULTS: Gout patients demonstrated a significantly higher risk of overall fractures compared to the non-gout group (aHR 5.52; 95% CI 4.19-7.26). A significant inverse linear relationship was observed between allopurinol adherence and fracture risk (P for trend&#x2009;<&#x2009;.001). The risk was highest in the low-adherence group (MPR&#x2009;<&#x2009;0.3; aHR 5.91; 95% CI 4.40-7.93) and relatively lower in the high-adherence group (MPR&#x2009;&#x2265;&#x2009;0.8; aHR 4.77; 95% CI 2.94-7.72). Consistent trends were observed for vertebral (aHR 5.68) and hip (aHR 4.22) fractures. These associations remained consistent across all subgroups, including age, sex, and comorbidities. CONCLUSION: Newly diagnosed gout is associated with a substantially increased risk of fractures. Higher adherence to Allopurinol therapy is correlated with a significant reduction in this risk, suggesting that consistent urate-lowering therapy may mitigate gout-related bone fragility. Key Points &#x2022; Newly diagnosed gout patients have a significantly higher risk of major osteoporotic fractures compared to the non-gout population. &#x2022; A significant inverse linear relationship exists between Allopurinol adherence and fracture risk, with the highest adherence group (MPR &#x2265; 0.8) showing a relatively lower risk. &#x2022; Consistent urate-lowering therapy (ULT) may mitigate bone fragility in gout patients by reducing systemic inflammatory burden caused by urate crystal deposition.

Humans↗

Management of gout in older adults: barriers to optimal control.

Gout, a common inflammatory arthritis, can be diagnosed with absolute certainty. Gout results from the body's reaction to urate crystals deposited in tissues, and this pathophysiology is well understood. If used appropriately, available therapies can be entirely effective in not only treating the symptoms of gout, but also in eliminating the excess urate from the body, thereby eradicating the disease. Because of these facts, management of patients with gout should be successful. However, management of gout is particularly challenging in the elderly, even though the principles of management are the same for all age groups. The purpose of this article is to review these principles and discuss them as they pertain to the elderly. The classic gout attack is acute in onset, extremely painful and associated with marked swelling, warmth, erythema and tenderness of a single joint. However, the diagnosis of gout may be challenging in the elderly because atypical presentations are more common in this group. Treatment of acute gout involves the use of NSAIDs, colchicine, corticosteroids or corticotropin (adrenocorticotropic hormone). Unfortunately, co-morbid conditions such as chronic kidney disease, peptic ulcer disease and congestive heart failure may make the use of these agents dangerous or contraindicated. Thus, it is important to try to treat an acute flare of gout at the earliest sign, because the sooner treatment is initiated, the faster the inflammation will resolve. Urate-lowering agents include allopurinol and uricosuric agents. These also must be used judiciously in the elderly. However, if used at the lowest dose that maintains the serum urate level below 5.0-6.0 mg/dL, the excess urate in the body will be eliminated, acute flares will no longer occur and tophi will resolve. Gout is often seen in association with hypertension, excessive alcohol consumption, obesity and hypertriglyceridaemia. These conditions and the medications used to treat them may contribute to the hyperuricaemia. Treating these conditions and using medications that do not promote hyperuricaemia will aid in the management of gout. Despite the challenges that often complicate the management of gout in the elderly, an understanding of the pathophysiology of the disease and both the indications and limitations of the medications used should allow successful treatment.

Aged↗

The association between gout and nephrolithiasis in men: The Health Professionals' Follow-Up Study.

Approximately 10 million adults in the United States have experienced the passage of a kidney stone, and up to 5 million have been diagnosed with gout by a physician. Previous reports have suggested that gout increases the risk for the development of kidney stones, but there are no prospective data. We used data from a cohort of 51,529 male health care professionals to examine the independent association between gout and kidney stone disease. In a cross-sectional analysis of gout and kidney stone disease reported on the 1986 baseline questionnaire, the prevalence of kidney stone disease was almost twofold higher in men with history of gout compared to those without (15% vs. 8%). After adjusting for age and body mass index (BMI), a history of gout remained significantly associated with kidney stone disease (OR 1.88; 95% CI 1.68 to 2.11). We then prospectively examined the risk of incident kidney stones in men with and without a confirmed diagnosis of gout after excluding men who reported a history of kidney stone disease or gout on the baseline questionnaire. A confirmed diagnosis of gout increased the multivariate relative risk of incident kidney stones (RR 2.12; 95% CI 1.22 to 3.68). In contrast, a history of kidney stone disease was not associated with increased risk of gout (RR 1.05; 95% CI 0.54 to 2.07). In conclusion, a history of gout independently increases the risk for incident kidney stones in men. Physicians should provide dietary counseling, such as increasing fluid intake and decreasing salt consumption, to subjects with gout in addition to other risk factors, such as family history of kidney stones, in order to decrease the likelihood of stone formation.

Adult↗

Purine-rich foods, dairy and protein intake, and the risk of gout in men.

BACKGROUND: Various purine-rich foods and high protein intake have long been thought to be risk factors for gout. Similarly, the possibility that the consumption of dairy products has a role in protecting against gout has been raised by metabolic studies. We prospectively investigated the association of these dietary factors with new cases of gout. METHODS: Over a 12-year period, we prospectively examined the relationship between purported dietary risk factors and new cases of gout among 47,150 men who had no history of gout at base line. We used a supplementary questionnaire to ascertain whether participants met the American College of Rheumatology survey criteria for gout. Diet was assessed every four years by means of a food-frequency questionnaire. RESULTS: During the 12 years of the study, we documented 730 confirmed new cases of gout. The multivariate relative risk of gout among men in the highest quintile of meat intake, as compared with those in the lowest quintile, was 1.41 (95 percent confidence interval, 1.07 to 1.86; P for trend = 0.02), and the corresponding relative risk associated with seafood intake was 1.51 (95 percent confidence interval, 1.17 to 1.95; P for trend = 0.02). In contrast, the incidence of gout decreased with increasing intake of dairy products; the multivariate relative risk among men in the highest quintile, as compared with those in the lowest quintile, was 0.56 (95 percent confidence interval, 0.42 to 0.74; P for trend <0.001). The level of consumption of purine-rich vegetables and the total protein intake were not associated with an increased risk of gout. CONCLUSIONS: Higher levels of meat and seafood consumption are associated with an increased risk of gout, whereas a higher level of consumption of dairy products is associated with a decreased risk. Moderate intake of purine-rich vegetables or protein is not associated with an increased risk of gout.

Adult↗

New-onset gout after kidney transplantation: incidence, risk factors and implications.

BACKGROUND: Although cyclosporine use has been associated with an increased risk of new-onset gout after renal transplantation, the incidence and risk factors for new-onset gout have not been reported in the era of modern immunosuppression. METHODS: We conducted a retrospective cohort study of Medicare primary renal transplant patients reported in the United States Renal Data System (USRDS), using Medicare claims data to determine the incidence of new-onset gout. Cox regression analysis was used to calculate adjusted hazard ratios (AHR) for cyclosporine (including separate analysis of Neoral) compared directly with tacrolimus, for the risk of new-onset gout, adjusted for baseline demographic factors and posttransplant renal function. RESULTS: The cumulative incidence of new-onset gout was 7.6% at 3 years posttransplant. The following factors were independently associated with an increased risk of new-onset gout: use of Neoral (vs. tacrolimus, AHR 1.25, 95% CI 1.07-1.47) at discharge, recipient male sex (AHR 1.44, 95% CI 1.25-1.67), older age, higher body mass index, and more recent year of transplant. No other immunosuppressive medications were associated with new-onset gout. Diabetes was associated with a significantly lower risk of new-onset gout. The development of new-onset gout was independently associated with decreased patient survival (AHR 1.26, 95% CI 1.08-1.47) as well as death-censored graft survival. CONCLUSIONS: Cyclosporine is an independent risk factor for new-onset gout after transplantation. The incidence of new-onset gout appears to be increasing even while the use of cyclosporine is decreasing, and the development of new-onset gout was an independent predictor for death and graft loss in this population.

Body Mass Index↗

Purine metabolism in patients with gout: the role of lead.

Primary gout is characterized by increased plasma and decreased urinary concentrations of hypoxanthine, xanthine and uric acid. To examine whether lead could explain the disturbance of purine metabolism in gout, we determined hypoxanthine, xanthine and uric acid metabolism and 5-day cumulative urinary lead excretion rates after an EDTA (calcium disodium edetate) test in 27 patients with primary gout and reduced creatinine clearance (C(cr)) and in 50 patients with gout and normal C(cr). The results were compared to those obtained in 26 normal subjects matched for age. All gout patients evidenced a marked renal underexcretion of hypoxanthine, xanthine and uric acid relative to their increased plasma levels. Purine metabolism was remarkably similar in both gout groups except for a significantly lower uric acid excretion in patients with reduced C(cr). Blood lead levels and cumulative lead excretion rates were significantly higher in gout patients with renal failure as compared to patients with normal C(cr). Fourteen patients (52%) with renal insufficiency and 6 (12%) with normal C(cr) showed increased lead excretion rates (95% Cl for the difference, 29-51%, p < 0.001). Mobilizable lead was not significantly correlated with serum or urinary purine concentrations. Hypoxanthine, xanthine and uric acid underexcretion was similar in gout patients with increased or normal cumulative lead excretion rates. The prevalence of atheromatosis and arterial hypertension together was significantly higher in gout patients with renal failure than in patients with normal C(cr) (81 vs. 60%, 95% Cl for the difference, 11-31%, p < 0.005). These results indicate that lead is not a significant contributor to the renal underexcretion of purines in gout. An increased mobilizable lead is not by itself evidence that lead is the cause of the renal insufficiency in patients with primary gout. Atheromatous nephropathy and/or nephroangiosclerosis may explain impaired renal function in patients with primary gout.

Aged↗

Severe tophaceous gout. Characterization of low socioeconomic level patients from México.

OBJECTIVE: To describe a group of patients with frequent tophaceous gout, the variables associated with severe tophaceous gout and to compare them with other patients with gout described elsewhere. METHODS: We looked for 65 demographic clinical and paraclinical variables from patients with gout who attended our gout clinic from 1995-2000 and were evaluated by the same group of physicians. RESULTS: Three hundred and sixteen patients were included, 98% males, 82% live in México city, the mean age at onset, educational level and disease duration were 37.5 +/- 12.4, 6.3 +/- 3.9 and 12.6 +/- 10.3 years respectively. Tophaceous gout was present in 62% of the patients with a mean tophi number of 4.7 +/- 6.3 and mean HAQ score 0.13 +/- 0.37. Severe tophaceous gout (>or= 5 tophi) was found in 34% and these patients had significantly: earlier age at onset, longer duration of the disease, lesser frequency of obesity and higher frequency of: intradermal tophi, HAQ > 0.5, hospitalizations, radiographic score III/IV, uric acid under-excretion, renal function impairment and previous (oral and parenteral) auto-prescribed chronic glucocorticoid treatment compared with patients with non-severe tophaceous gout. In the multiple logistic regression the significant variables were renal function impairment (p = 0.000) and previous chronic parenteral glucocorticoid treatment (p = 0.011) . CONCLUSION: Our patients compared with those from other countries who have earlier age at onset, very low frequency of gout among females, frequent tophaceous gout and severe tophaceous gout. Severe tophaceous gout in this group is associated with renal function impairment and previous chronic parenteral glucocorticoid treatment.

Adult↗

Metagenome-Based Characterization of the Gut Virome Signatures in Patients With Gout.

The gut microbiome has been implicated in the development of autoimmune diseases, including gout. However, the role of the gut virome in gout pathogenesis remains underexplored. We employed a reference-dependent virome approach to analyze fecal metagenomic data from 102 gout patients (77 in the discovery cohort and 25 in the validation cohort) and 86 healthy controls (HCs) (63 and 23 in each cohort). A subset of gout patients in the discovery cohort provided longitudinal samples at Weeks 2, 4, and 24. Our analysis revealed significant alterations in the gut virome of gout patients, including reduced viral richness and shifts in viral family composition. Notably, Siphoviridae, Myoviridae, and Podoviridae were depleted, while Quimbyviridae, Retroviridae, and Schitoviridae were enriched in gout patients. We identified 359 viral operational taxonomic units (vOTUs) associated with gout. Enriched vOTUs in gout patients predominantly consisted of Fusobacteriaceae, Bacteroidaceae, and Selenomonadaceae phages, while control-enriched vOTUs included Ruminococcaceae, Oscillospiraceae, and Enterobacteriaceae phages. Longitudinal analysis revealed that a substantial proportion of these virome signatures remained stable over 6 months. Functional profiling highlighted the enrichment of viral auxiliary metabolic genes, suggesting potential metabolic interactions between viruses and host bacteria. Notably, gut virome signatures effectively discriminated gout patients from HCs, with high classification performance in the validation cohort. This study provides the first comprehensive characterization of the gut virome in gout, revealing its potential role in disease pathogenesis and highlighting virome-based signatures as promising biomarkers for gout diagnosis and future therapeutic strategies.

Humans↗

Effectiveness of interventions for the treatment of acute and prevention of recurrent gout--a systematic review.

OBJECTIVE: To determine the evidence for the effectiveness of treatments for acute gout and the prevention of recurrent gout. METHOD: Seven electronic databases were searched for randomized controlled trials of treatments for gout from their inception to the end of 2004. No language restrictions were applied. All randomized controlled trials of treatments routinely available for the treatment of gout were included. Trials of the prevention of recurrence were included only if patients who had had gout and had at least 6 months of follow-up were studied. RESULTS: We found 13 randomized controlled trials of treatment for acute gout, two of which were placebo controlled. Colchicine was found to be effective in one study; however, the entire colchicine group developed toxicity. The only robust conclusion from studies of non-steroidal anti-inflammatory drugs is that pain relief from indometacin and etoricoxib are equivalent. We found one randomized controlled trial, reported only as a conference abstract, of recurrent gout prevention. CONCLUSION: The shortage of robust data to inform the management of a common problem such as gout is surprising. All of the drugs used to treat gout can have serious side effects. The incidence of gout is highest in the elderly population. It is in this group, who are at a high risk of serious adverse events, that we are using drugs of known toxicity. The balance of risks and benefits for the drug treatment of gout needs to be reassessed.

Acute Disease↗

The management of gout at an academic healthcare center in Beijing: a physician survey.

OBJECTIVE: Gout is a less commonly diagnosed rheumatic disease in China compared with Western countries, but its prevalence appears to be climbing. It is not known how Chinese physicians diagnose and treat their patients with gout, so we evaluated physician management of gout at a major academic healthcare center in Beijing, and investigated factors associated with better decision-making. METHODS: A 13-question anonymous survey was distributed and collected at a medical grand rounds and then at a rheumatology grand rounds at a major teaching hospital in Beijing. Physician demographic data including educational background, work experience, job titles, specialty or subspecialties, gout patient volume seen in a year, and continuing medical education (CME) in gout were also collected in the survey. Data were analyzed by multivariate regression models to identify factors associated with appropriate answers. RESULTS: Twenty-seven residents and general internists, 26 rheumatologists and fellows, and 28 physicians and fellows of other medical subspecialties from the Department of Medicine including visiting physicians responded to the survey. Among respondents, 78% think it is important for a definitive diagnosis of gout, but few actually perform aspiration of the affected joint fluid. Eighty-four percent report that they often follow the serum urate level of their patients with diagnosed gout. When treating acute gout in otherwise healthy patients, most physicians (77%) prefer oral colchicine, and in patients with renal impairment, about half of them (48%) choose corticosteroids or corticotropin as their first treatment. For longterm urate-lowering therapy, most physicians (87%) described a variety of indications that we consider less appropriate. They (86%) tend to initiate it early (< 2 weeks) after acute flares. When urate-lowering therapy is used, 80% of physicians sustain it less than 5 years. Further, only 12% of physicians use antiinflammatory prophylaxis during the initiation of urate-lowering treatment, and only 5% maintain it for an appropriate period of time. Logistic regression analysis of physician demographic data, educational background, and work experience found no consistent independent factors associated with better decision-making, other than CME, that were associated with establishing the definite diagnosis correctly. Specifically, the number of gout patients seen by physicians was not related to better decision-making. CONCLUSION: The physicians' reported management of gout at this major academic healthcare center in Beijing was often inconsistent with current evidence. High quality CME is required to improve Chinese physician management of gout.

Academic Medical Centers↗