Objective: Calcium Pyrophosphate Deposition Disease (CPPD) is a common inflammatory arthritis among older adults. Comorbidities often limit conventional treatment of acute CPPD flare. Anakinra, an interleukin-1 inhibitor, is a promising alternative. We aimed to evaluate the efficacy and safety of anakinra in acute CPPD flares.
Methods: We systematically searched studies from MEDLINE, EMBASE, and the Cochrane Database up until August 2024. The primary outcome was a positive treatment response between day 3 and day 5 after anakinra initiation. Secondary outcomes included changes in pain ratings assessed by the visual analog scales (VAS), C-reactive protein levels, tender joint counts (TJC), swollen joint counts (SJC), and steroid usage.
Results: Six studies were included in our meta-analysis: five observational studies and one randomized controlled trial. A total of 84 patients were included in our analysis. Subjective physician assessments of clinical response were reported in all studies with a combined positive treatment response rate of 76% (95%CI: 61-86, I2 = 0%). Our pooled analysis also showed a significant reduction of VAS scores by 48.12 mm (95% CI: 53.21-43.03, I2 = 0%) and CRP levels by 62.09 mg/L (95% CI: 97.74-26.44, I2 = 77%) from baseline. Reductions of TJC and SJC were also demonstrated, 4.86 (95% CI: 5.48-4.23, I2 = 0%) and 3.65 (95% CI: -12.53-5.22, I2 = 54%), respectively. Adverse reactions included injection site reaction, rash, bacterial pneumonitis, and neutropenia.
Conclusions: Anakinra is a promising alternative treatment for patients with acute CPPD flare as it showed desirable clinical responses and a favourable safety profile.
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