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Rheumatology5043 papers

Acute polyarthritis

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Overview

Acute polyarthritis, particularly in the context of gout, refers to sudden and severe inflammation affecting multiple joints. This condition is characterized by intense pain, swelling, redness, and warmth in affected joints, predominantly impacting the lower extremities such as the toes and ankles, though it can involve any joint. Gout disproportionately affects middle-aged to elderly individuals, with a higher prevalence in men compared to women, though postmenopausal women also face increased risk. The clinical significance lies in its potential to cause significant morbidity, including chronic joint damage and systemic complications if not managed effectively. Understanding and promptly addressing acute polyarthritis is crucial in day-to-day practice to prevent long-term disability and improve patient quality of life 134.

Pathophysiology

Gout arises from hyperuricemia, where serum uric acid levels exceed the saturation point, leading to the formation of monosodium urate (MSU) crystals within joints and surrounding tissues. These crystals act as potent danger signals, triggering innate immune responses primarily through the NLRP3 inflammasome pathway. Upon recognition by pattern recognition receptors on immune cells like macrophages and neutrophils, the NLRP3 inflammasome is activated, resulting in the production of pro-inflammatory cytokines such as IL-1β. This cytokine storm initiates a robust inflammatory cascade characterized by neutrophil infiltration, release of inflammatory mediators, and the formation of neutrophil extracellular traps (NETs), which further perpetuate inflammation and contribute to tissue damage and tophus development 1812. Additionally, circadian rhythms influence gout flares, with peak activity often observed at night, highlighting the temporal regulation of inflammatory processes in this condition 12.

Epidemiology

Globally, the prevalence of gout ranges widely, from approximately 0.1% to 10%, with significant regional variations 3. The incidence of gout has been rising, particularly in developed regions, driven by factors such as obesity, metabolic syndrome, and dietary changes 345. Men are more commonly affected than women, with a peak incidence in middle age, though postmenopausal women also experience increased risk due to hormonal changes 3. Geographic disparities exist, with higher prevalence noted in economically developed areas compared to inland regions 5. Epidemiological studies indicate a concerning trend towards younger onset of gout, emphasizing the growing public health burden of this condition 34.

Clinical Presentation

Acute polyarthritis in gout typically presents with sudden onset of severe joint pain, often in the lower extremities, particularly the first metatarsophalangeal joint (podagra). Patients describe intense pain, erythema, swelling, and warmth around the affected joints. Atypical presentations can occur, including involvement of less common joints like wrists, ankles, or knees, and may mimic other inflammatory arthropathies. Red-flag features include persistent joint swelling, systemic symptoms like fever, and the presence of tophi, which are visible chalky deposits under the skin. Prompt recognition of these symptoms is crucial for timely intervention to prevent chronic joint damage 13.

Diagnosis

The diagnosis of acute polyarthritis in the context of gout involves a combination of clinical assessment and laboratory testing. Key steps include:

  • Clinical Evaluation: Detailed history focusing on joint symptoms, dietary habits, and comorbidities.
  • Laboratory Tests:
  • - Serum Uric Acid (SUA): Elevated levels (typically >6.8 mg/dL or >0.36 mmol/L) support the diagnosis. - Synovial Fluid Analysis: If available, aspiration and analysis showing needle-shaped MSU crystals under polarized light microscopy is diagnostic. - Imaging: Ultrasound or MRI may reveal urate crystal deposits or tophi.

    Differential Diagnosis:

  • Septic Arthritis: Foul-smelling synovial fluid, elevated white blood cell count, and positive cultures differentiate it.
  • Rheumatoid Arthritis: Presence of rheumatoid factor (RF) or anti-cyclic citrullinated peptide (anti-CCP) antibodies helps distinguish.
  • Pseudogout: Calcium pyrophosphate dihydrate (CPPD) crystals in synovial fluid analysis identify this condition.
  • Management

    Initial Management

  • Acute Flares:
  • - Nonsteroidal Anti-Inflammatory Drugs (NSAIDs): High-dose therapy (e.g., indomethacin 75 mg three times daily) for short-term use. - Colchicine: 1-2 mg initially, followed by 0.5-1 mg after 1 hour if needed (maximum 4 mg/day). - Corticosteroids: Oral (e.g., prednisolone 40 mg daily for 3-5 days) or intra-articular injection for severe cases.

    Long-term Management

  • Urate-Lowering Therapy (ULT):
  • - First-Line: - Allopurinol: Start at 100-300 mg daily, titrate up to achieve target SUA <0.36 mmol/L (<6 mg/dL). - Febuxostat: 40-80 mg daily, particularly in patients with renal impairment or those intolerant to allopurinol. - Second-Line: - Probenecid: For patients with adequate renal function, 500-1500 mg daily in divided doses. - Lesinurad: In combination with a xanthine oxidase inhibitor for refractory hyperuricemia. - Special Considerations: - Renal Impairment: Adjust dosing based on creatinine clearance; consider febuxostat over allopurinol. - Dialysis Patients: Monitor SUA levels closely; dosing adjustments may be necessary despite dialysis.

    Monitoring: Regular SUA levels every 1-3 months until target achieved, then every 3-6 months.

    Refractory Cases

  • Specialized Therapies:
  • - Pegadricase (Krystexy): For severe refractory gout, administered intravenously every 2-4 weeks. - Nanoencapsulated Sirolimus Plus Pegadricase (NASP): Novel approach for uncontrolled gout, administered every 4 weeks, establishing immunotolerance and mitigating anti-uricase antibodies.

    Complications

  • Acute Complications:
  • - Joint Destruction: Persistent inflammation can lead to chronic joint damage and deformity. - Tophi: Deposits of urate crystals in soft tissues, leading to nodules and functional impairment.
  • Long-term Complications:
  • - Chronic Arthritis: Recurrent flares contribute to progressive joint destruction. - Renal Impairment: Uric acid nephropathy can develop, especially in poorly controlled cases. - Cardiovascular Risk: Hyperuricemia is associated with increased cardiovascular morbidity.

    Referral Triggers: Persistent flares, inadequate response to therapy, renal involvement, or complex comorbidities warrant specialist referral.

    Prognosis & Follow-up

    The prognosis of gout is generally good with effective management, but chronic undertreatment can lead to significant joint damage and systemic complications. Key prognostic indicators include achieving and maintaining target SUA levels, absence of recurrent flares, and absence of tophi. Recommended follow-up intervals include:
  • Initial Follow-up: Within 1-2 weeks post-diagnosis to assess response to acute treatment.
  • SUA Monitoring: Every 1-3 months initially, then every 3-6 months once stable.
  • Clinical Assessment: Regular evaluations to monitor for signs of chronic joint damage or systemic complications.
  • Special Populations

  • Pregnancy: Allopurinol is generally avoided; febuxostat may be considered if necessary, with close monitoring.
  • Elderly: Increased risk of renal impairment; careful dosing adjustments are essential.
  • Renal Impairment: Adjust dosing of allopurinol and consider febuxostat; monitor SUA levels closely.
  • Ethnic Variations: Higher prevalence in certain populations (e.g., Korean, Thai, Chinese) may necessitate genetic screening for HLA-B5801 to guide allopurinol use.
  • Key Recommendations

  • Achieve Target Serum Uric Acid Levels: Aim for SUA <0.36 mmol/L (<6 mg/dL) using appropriate ULT (Evidence: Strong 13).
  • Initiate Prompt Acute Flare Treatment: Use NSAIDs, colchicine, or corticosteroids based on severity (Evidence: Strong 1).
  • Consider Genetic Factors in Allopurinol Use: Screen for HLA-B5801 in high-risk populations to avoid severe adverse reactions (Evidence: Moderate 7).
  • Monitor Renal Function in ULT Selection: Adjust dosing based on creatinine clearance, favoring febuxostat in renal impairment (Evidence: Moderate 25).
  • Regular Follow-up and SUA Monitoring: Ensure adherence and efficacy with frequent SUA checks (Evidence: Moderate 13).
  • Refer Complex Cases to Rheumatology: For refractory gout, renal involvement, or systemic complications (Evidence: Expert opinion 12).
  • Educate Patients on Lifestyle Modifications: Weight management, dietary changes, and alcohol reduction to prevent flares (Evidence: Moderate 34).
  • Consider Novel Therapies for Refractory Cases: Evaluate pegadricase or NASP in uncontrolled gout (Evidence: Moderate 13).
  • Screen for Metabolic Syndrome: Given the high comorbidity, manage associated risk factors (Evidence: Moderate 9).
  • Evaluate for Comorbidities: Regular assessment for cardiovascular risk and renal function in gout patients (Evidence: Moderate 510).
  • References

    Showing 100 priority papers (full text preferred, most recent first) of 5043 indexed.

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