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Zorluk: OrtaPharmacologic Interventions

A 68-year-old man is evaluated in the urgent care clinic for a 24-hour history of severe, progressive pain and swelling in his right knee. He is unable to bear weight on the affected leg. His medical history is significant for type 2 diabetes mellitus, hypertension, and stage 4 chronic kidney disease with a baseline estimated glomerular filtration rate (eGFR) of 24 mL/min/1.73 m224 \text{ mL/min/1.73 m}^2. Current medications include amlodipine, insulin detemir, and calcium acetate. Vital signs are temperature 37.2∘C37.2^\circ\text{C} (99.0∘F99.0^\circ\text{F}), pulse 88/min, and blood pressure 138/84 mm Hg. Physical examination reveals a swollen, erythematous, and exquisitely tender right knee with a moderate effusion. Arthrocentesis is performed. Synovial fluid analysis reveals a leukocyte count of 28,000/μL28,000/\mu\text{L} (85% neutrophils) and the presence of negatively birefringent, needle-shaped crystals under polarized light microscopy. Gram stain is negative. Which of the following is the most appropriate pharmacologic intervention for this patient's acute joint condition?

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

Cevap

Intra-articular triamcinolone is the most appropriate treatment.
Intra-articular triamcinolone is the most appropriate intervention because this patient has an acute monoarticular gout flare combined with severe chronic kidney disease (CKD stage 4). While NSAIDs, colchicine, and systemic/intra-articular glucocorticoids are all first-line options for acute gout in healthy individuals, patient comorbidities dictate the final choice. In severe renal impairment (eGFR <30 mL/min/1.73 m^2), NSAIDs are absolutely contraindicated due to the risk of precipitating acute-on-chronic renal failure. Colchicine should also be avoided due to the high risk of fatal toxicity. For a single accessible inflamed joint, intra-articular glucocorticoids provide rapid, targeted relief with minimal systemic absorption.

Adım Adım Çözüm

1
Interpret the synovial fluid analysis results.
The presence of negatively birefringent, needle-shaped crystals confirms the diagnosis of acute gouty arthritis. The elevated leukocyte count of 28,000/μL is an expected inflammatory response to the crystals.
Establishing a definitive crystal diagnosis eliminates the immediate need for empiric antibiotics despite the highly inflammatory fluid.
2
Review the patient's medical history for contraindications to standard therapies.
The patient has stage 4 chronic kidney disease (eGFR 24 mL/min/1.73 m^2).
Comorbidities dictate the safety profile of acute gout therapies. Standard first-line agents (NSAIDs and colchicine) rely on renal clearance or can directly damage the kidneys.
3
Select the optimal pharmacologic intervention based on the clinical presentation and safety profile.
Intra-articular triamcinolone is selected.
Because the patient has a monoarticular flare (one accessible joint) and severe renal impairment, a local glucocorticoid injection provides excellent efficacy while avoiding the systemic nephrotoxicity of NSAIDs and the systemic neuromyopathy risk of colchicine.

Anahtar Kavram

In patients with acute monoarticular gout and severe chronic kidney disease (eGFR < 30 mL/min/1.73 m^2), NSAIDs and colchicine are contraindicated; intra-articular glucocorticoids are the preferred first-line therapy.
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Pharmacologic Interventions

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