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This study explored the value of cystatin C (CysC) in predicting stroke recurrence in patients with acute ischemic stroke.Methods and Results:This was a post hoc analysis of the China Antihypertensive Trial in Acute Ischemic Stroke (CATIS) on 3,474 acute ischemic stroke patients with documented serum CysC and high-sensitivity C-reactive protein (hsCRP) concentrations. Study outcomes included stroke recurrence and combined vascular events within 2 years after stroke. In stroke patients with higher (i.e., ≥4.8ng/mL), but not lower, hsCRP concentrations, a higher CysC concentration (i.e., ≥0.78 mg/L) was associated with a 2.48-fold increase in the risk of recurrent stroke (95% confidence interval [CI] 1.37-4.51; P=0.003) and a 2.04-fold increase in the risk of vascular events (95% CI 1.27-3.28; P=0.003). Serum hsCRP concentrations significantly modified the association of serum CysC with recurrent stroke (P interaction =0.001) and vascular events (P interaction =0.007). Moreover, CysC may improve reclassification of stroke recurrence (net reclassification improvement [NRI] 42.9%, P=0.001; integrated discrimination improvement [IDI] 1.2%, P=0.001) and vascular events (NRI 35.8%, P=0.001; IDI 1.1%, P=0.004).

Predictive Value of Cystatin C for Stroke Recurrence in Patients With Acute Ischemic Stroke