[Prospective study of cystatin C for diagnosis of acute kidney injury after cardiac surgery].

Objective: To prospectively study the value of cystatin C in diagnosis of acute kidney injury (AKI) in patients after cardiac surgery.

Methods: A total of 132 patients undergoing cardiopulmonary bypass were enrolled in this prospectively study. From each patient, blood samples were collected everyday before and after operation to detect the serum creatinine (Scr) and cystatin C levels by enzymatic method and particle-enhanced turbidimetric immunoassay (PETIA), respectively, and the glomerular filtration rate (eGFR) was estimated using MDRD equation.