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Background:   The association between renal impairment (RI) and stroke outcome after endovascular thrombectomy (EVT) remains unclear, which limits the estimation of patient prognosis by clinicians involved in EVT decision-making.Purpose:   This study aimed to investigate the association between RI and acute ischemic stroke (AIS) outcomes in patients treated with EVT.Methods:   Studies involving the association between RI at admission and AIS outcomes after EVT were retrieved from the PubMed and Embase databases from their inception to 17 January 2022. A fixed-effects model was used to synthesize the data of the included studies. Sensitivity analysis was performed to identify the source of heterogeneity.Results:   Overall, 11 studies, including 5053 patients with stroke receiving EVT, were included in the full analysis. In unadjusted analyses, RI was associated with 3-month poor functional outcome and mortality; the odds ratios (ORs) were 2.13 [10 studies; 95% confidence interval (CI), 1.77–2.56; I 2  = 45%] and 2.42 (8 studies; 95% CI, 2.02–2.90; I 2  = 58%), respectively. In adjusted analyses, the above associations remained significant; the OR of the 3-month poor functional outcome was 1.49 (5 studies; 95% CI, 1.17–1.90; I 2  = 58%), and the OR of the 3-month mortality was 1.84 (6 studies; 95% CI, 1.45–2.33; I 2  = 74%). Similar results were obtained in sensitivity analyses.Conclusion:   Our results suggest that in patients with AIS who underwent EVT, RI at admission was associated with 3-month poor functional outcome and mortality.

Renal impairment and the prognosis of endovascular thrombectomy: a meta-analysis and systematic review