Koyner JL, Garg AX, Shlipak MG, Patel UD, Sint K, Hong K, Devarajan P, Edelstein CL, Zappitelli M, Thiessen-Philbrook H, Parikh CR. Urinary cystatin C and acute kidney injury after cardiac surgery.
Am J Kidney Dis 2013;
61:730-8. [PMID:
23332602 DOI:
10.1053/j.ajkd.2012.12.006]
[Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Accepted: 12/05/2012] [Indexed: 01/31/2023]
Abstract
BACKGROUND
Acute kidney injury (AKI) is common after cardiac surgery and is associated with adverse patient outcomes. Urinary cystatin C (CysC) level is a biomarker of proximal tubule function and may increase earlier in AKI than serum creatinine level.
STUDY DESIGN
Prospective cohort study.
SETTINGS & PARTICIPANTS
The TRIBE AKI (Translational Research Investigating Biomarker Endpoints in AKI) Consortium prospectively enrolled 1,203 adults and 299 children and adolescents at 8 institutions in 2007-2009.
INDEX TEST
Urinary CysC (in milligrams per liter) within the first 12 hours after surgery.
OUTCOME
Serum creatinine-based AKI was defined as AKI Network stage 1 (mild AKI) and doubling of serum creatinine from the preoperative value or need for dialysis during hospitalization (severe AKI).
OTHER MEASUREMENTS
Analyses were adjusted for characteristics used clinically for AKI risk stratification, including age, sex, race, estimated glomerular filtration rate, diabetes, hypertension, heart failure, nonelective surgery, cardiac catheterization within 72 hours, type of surgery, myocardial infarction, and cardiopulmonary bypass time longer than 120 minutes.
RESULTS
Urinary CysC level measured in the early postoperative period (0-6 and 6-12 hours postoperatively) correlated with both mild and severe AKI in adults and children. However, after analyses were adjusted for other factors, the effect was attenuated for both forms of AKI in both cohorts.
LIMITATIONS
Limited numbers of patients with severe AKI and in-hospital dialysis treatment.
CONCLUSIONS
Urinary CysC values are not associated significantly with the development of AKI after cardiac surgery in adults and children.
Collapse