Prognostic value of contrast staining on dual-energy CT after endovascular therapy in acute ischemic stroke: a meta-analysis

BACKGROUND: Contrast staining (CS) on dual-energy CT (DECT) is common after endovascular therapy (EVT) in acute ischemic stroke (AIS). We performed a meta-analysis to investigate the prognostic significance of CS detected by DECT after EVT in AIS. METHOD: MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, Web of Science and Scopus databases were searched from inception to July 2023 for publications on the prognostic significance of CS on DECT after EVT in patients with AIS. Prognostic outcomes were hemorrhage transformation (HT) and poor functional outcome (modified Rankin Scale [mRS] Score of 3–6 at the 90-day follow-up). Data are presented as odds ratios (OR) and 95% confidence intervals (CI). RESULTS: Eleven studies including 1123 cases of AIS were included. Pooled results indicated a higher risk of HT in patients with CS than in those without CS (OR = 2.22; 95% CI 1.41–3.51, P = 0.001; I(2) = 45.4%). No association between CS and symptomatic HT was observed (OR = 2.10; 95% CI 0.64–6.95, P = 0.223; I(2) = 67.3%). Moreover, there was also higher odds of poor functional outcome in patients with CS than in those without CS (OR = 2.76; 95% CI 1.53–4.97, P = 0.001; I(2) = 44.9%). CONCLUSIONS: The presence of contrast staining on DECT after EVT is associated with a higher risk of hemorrhage transformation and poor functional outcome. However, further high-quality studies with standardized processes are required to confirm these results. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12883-023-03370-9.