Objective: Patients with peripheral arterial disease (PAD) are predisposed to postprocedure adverse limb events (ALE). Previous single-center studies investigating the relationship between baseline C-reactive protein (CRP) levels and postprocedure ALE have reported inconsistent results. Therefore, we performed a systematic review and meta-analysis of reported data to determine the association between CRP levels and the occurrence of postprocedure ALE in patients with PAD.
Methods: Studies investigating the association between the CRP levels and postprocedure ALE (ie, target vessel revascularization, amputation, restenosis, disease progression, composite endpoint of any of these ALE) were identified in the Medline, EMBASE, and Cochrane databases. Meta-analyses of the reported hazard ratios (HRs) were conducted using an inverse variance-weighted random effects model. Subgroup analyses were performed to determine the differences in outcomes between open surgery and endovascular treatment. Pooled estimates are reported as HRs to compare higher and lower CRP levels and odds ratio or relative risk per unit increase in logCRP (natural logarithm C-reactive protein).
Results: A total of eight studies involving 1460 participants were included in our meta-analysis. Patients with higher baseline CRP levels had a greater risk of ALE (HR, 1.09; 95% confidence interval, 1.00-1.18; P = .04) compared with those with lower baseline CRP levels. The pooled estimate of odds ratio and relative risk for ALE was 2.25 (95% confidence interval, 1.49-3.41; P < .01) per unit increase in logCRP. Subgroup analyses found no significant differences in the pooled estimates in studies of open surgery vs endovascular treatment.
Conclusions: Our results have demonstrated that high baseline CRP levels are predictive of ALE in patients with PAD after lower limb revascularization.
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