Chronic kidney disease, cardiovascular risk markers and total mortality in older men: cystatin C versus creatinine

J Epidemiol Community Health. 2019 Jul;73(7):645-651. doi: 10.1136/jech-2018-211719. Epub 2019 Mar 19.

Abstract

Background: It remains uncertain whether cystatin C is a superior marker of renal function than creatinine in older adults. We have investigated the association between estimated glomerular filtration rate (eGFR) using the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equations based on creatinine (CKD-EPIcr) and cystatin C (CKD-EPIcys), and cardiovascular risk markers and mortality in older adults.

Methods: This is a cross-sectional and prospective study of 1639 British men aged 71-92 years followed up for an average of 5 years for mortality. Cox survival model and receiving operating characteristic analysis were used to assess the associations.

Results: The prevalence of chronic kidney disease (CKD) was similar using the two CKD-EPI equations, although cystatin C reclassified 43.9% of those with stage 3a CKD (eGFR 45-59 mL/min/1.732, moderate damage) to no CKD. However, CKD stages assessed using both CKD-EPIcr and CKD-EPIcys were significantly associated with vascular risk markers and with all-cause and cardiovascular disease mortality. In all men with CKD (eGFR <60 mL/min/1.732), the HRs (95% CI) for all-cause mortality after adjustment for cardiovascular risk factors compared with those with no CKD were 1.53 (1.20 to 1.96) and 1.74 (1.35 to 2.23) using CKD-EPIcr and CKD-EPIcys, respectively. Comparisons of the two CKD equations showed no significant difference in their predictive ability for mortality (difference in area under the curve p=0.46).

Conclusion: Despite reclassification of CKD stages, assessment of CKD using CKD-EPIcys did not improve prediction of mortality in older British men >70 years. Our data do not support the routine use of CKD-EPIcys for identifying CKD in the elderly British male population.

Keywords: cardiovascular disease; epidemiology; mortality.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aged, 80 and over
  • Biomarkers / blood
  • Cardiovascular Diseases / epidemiology
  • Cardiovascular Diseases / physiopathology*
  • Creatinine / blood*
  • Cross-Sectional Studies
  • Cystatin C / blood*
  • Female
  • Glomerular Filtration Rate
  • Heart Disease Risk Factors
  • Humans
  • Male
  • Mortality
  • Predictive Value of Tests
  • Prevalence
  • Prospective Studies
  • ROC Curve
  • Renal Insufficiency, Chronic / blood
  • Renal Insufficiency, Chronic / epidemiology
  • Renal Insufficiency, Chronic / physiopathology*
  • Severity of Illness Index
  • United Kingdom / epidemiology

Substances

  • Biomarkers
  • Cystatin C
  • Creatinine