@article {912, title = {Cystatin C and prognosis for cardiovascular and kidney outcomes in elderly persons without chronic kidney disease.}, journal = {Ann Intern Med}, volume = {145}, year = {2006}, month = {2006 Aug 15}, pages = {237-46}, abstract = {

BACKGROUND: Cystatin C is an alternative measure of kidney function that may have prognostic importance among elderly persons who do not meet standard criteria for chronic kidney disease (estimated glomerular filtration rate [GFR] > or =60 mL/min per 1.73 m2).

OBJECTIVE: To evaluate cystatin C as a prognostic biomarker for death, cardiovascular disease, and incident chronic kidney disease among elderly persons without chronic kidney disease.

DESIGN: Cohort study.

SETTING: The Cardiovascular Health Study, a population-based cohort recruited from 4 communities in the United States.

PARTICIPANTS: 4663 elderly persons.

MEASUREMENTS: Measures of kidney function were creatinine-based estimated GFR by using the Modification of Diet in Renal Disease equation and cystatin C concentration. Outcomes were death, cardiovascular death, noncardiovascular death, heart failure, stroke, myocardial infarction, and incident chronic kidney disease during follow-up (median, 9.3 years).

RESULTS: At baseline, 78\% of participants did not have chronic kidney disease (estimated GFR > or =60 mL/min per 1.73 m2) and mean cystatin C concentration, creatinine concentration, and estimated GFR were 1.0 mg/L, 79.6 micromol/L (0.9 mg/dL), and 83 mL/min per 1.73 m2, respectively. Cystatin C concentrations (per SD, 0.18 mg/L) had strong associations with death (hazard ratio, 1.33 [95\% CI, 1.25 to 1.40]), cardiovascular death (hazard ratio, 1.42 [CI, 1.30 to 1.54]), noncardiovascular death (hazard ratio, 1.26 [CI, 1.17 to 1.36]), incident heart failure (hazard ratio, 1.28 [CI, 1.17 to 1.40]), stroke (hazard ratio, 1.22 [CI, 1.08 to 1.38]), and myocardial infarction (hazard ratio, 1.20 [CI, 1.06 to 1.36]) among these participants. Serum creatinine concentrations had much weaker associations with each outcome and only predicted cardiovascular death. Participants without chronic kidney disease who had elevated cystatin C concentrations (> or =1.0 mg/L) had a 4-fold risk for progressing to chronic kidney disease after 4 years of follow-up compared with those with cystatin C concentrations less than 1.0 mg/L.

LIMITATIONS: Because this study did not directly measure GFR or albuminuria, the extent to which cystatin C may be influenced by nonrenal factors was not determined and participants with albuminuria might have been misclassified as having no kidney disease.

CONCLUSIONS: Among elderly persons without chronic kidney disease, cystatin C is a prognostic biomarker of risk for death, cardiovascular disease, and chronic kidney disease. In this setting, cystatin C seems to identify a "preclinical" state of kidney dysfunction that is not detected with serum creatinine or estimated GFR.

}, keywords = {Aged, Biomarkers, Cardiovascular Diseases, Creatinine, Cystatin C, Cystatins, Glomerular Filtration Rate, Humans, Kidney, Longitudinal Studies, Prognosis, Proportional Hazards Models, Renal Insufficiency, Chronic, Risk Factors}, issn = {1539-3704}, doi = {10.7326/0003-4819-145-4-200608150-00003}, author = {Shlipak, Michael G and Katz, Ronit and Sarnak, Mark J and Fried, Linda F and Newman, Anne B and Stehman-Breen, Catherine and Seliger, Stephen L and Kestenbaum, Brian and Psaty, Bruce and Tracy, Russell P and Siscovick, David S} }