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Difficulty: EasyPharmacologic Interventions

A 68-year-old man presents to the ambulatory care clinic with a 1-day history of severe pain, swelling, and redness in his left knee. The pain began abruptly and is exacerbated by any movement or weight-bearing. His medical history is significant for long-standing hypertension, type 2 diabetes mellitus, and stage 4 chronic kidney disease with a recent estimated glomerular filtration rate of 22 mL/min/1.73 m222 \text{ mL/min/1.73 m}^2. Vital signs show a temperature of 37.2∘C37.2^\circ\text{C} (99.0∘F99.0^\circ\text{F}), blood pressure of 142/85 mmHg142/85 \text{ mmHg}, and heart rate of 82/min82\text{/min}. Physical examination reveals a warm, erythematous, and swollen left knee with a detectable effusion. Arthrocentesis is performed. Synovial fluid analysis reveals a leukocyte count of 35,000/mm335,000\text{/mm}^3 (predominantly neutrophils). Gram stain is negative, and polarized light microscopy demonstrates numerous needle-shaped, negatively birefringent crystals. Which of the following is the most appropriate pharmacologic intervention for this patient's acute symptoms?

  1. Intra-articular triamcinoloneAnswer
  2. B
    Oral indomethacin
  3. C
    Oral colchicine
  4. D
    Oral allopurinol
  5. E
    Intravenous ceftriaxone

Answer

Intra-articular triamcinolone
The correct answer is intra-articular triamcinolone. This patient is experiencing an acute gout flare, confirmed by the pathognomonic finding of needle-shaped, negatively birefringent crystals in the synovial fluid. While oral nonsteroidal anti-inflammatory drugs (NSAIDs) or colchicine are standard first-line therapies for acute gout in healthy individuals, this patient has stage 4 chronic kidney disease. Both NSAIDs and colchicine are strongly avoided or contraindicated in advanced renal impairment (eGFR <30 mL/min/1.73 m2< 30 \text{ mL/min/1.73 m}^2) due to the high risks of precipitating acute-on-chronic renal failure and systemic toxicity (neuromyopathy, myelosuppression), respectively. Therefore, localized therapy with an intra-articular glucocorticoid is the safest and most effective pharmacologic intervention, as it provides rapid symptom relief without threatening remaining renal function.

Step-by-Step Solution

1
Interpret the synovial fluid analysis.
The negative Gram stain and the presence of negatively birefringent, needle-shaped crystals confirm an acute gout flare, effectively ruling out septic arthritis.
Establishing a definitive diagnosis is required before selecting targeted pharmacotherapy.
2
Evaluate the patient's comorbidities for therapeutic contraindications.
The patient has stage 4 chronic kidney disease with an eGFR of 22 mL/min/1.73 m222 \text{ mL/min/1.73 m}^2.
Standard first-line systemic gout therapies (NSAIDs and colchicine) rely on renal clearance or renal compensatory mechanisms, making them dangerous in advanced renal failure.
3
Select the safest, most effective pharmacologic intervention.
Intra-articular glucocorticoids (e.g., triamcinolone) provide potent, localized anti-inflammatory relief without systemic renal toxicity.
It successfully treats the acute condition while adhering to the patient's absolute medical contraindications.

Key Concept

Management of acute gout flares in patients with severe chronic kidney disease.
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Topics

Pharmacologic Interventions

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