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

Lookup NU author(s): Dr Sheena Ramsay

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by BMJ, 2019.

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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 olderBritish men >70 years. Our data do not support the routine use of CKD-EPIcys for identifying CKD in the elderly British male population.


Publication metadata

Author(s): Zonoozi S, Ramsay SE, Papacosta O, Lennon LT, Ellins EA, Halcox JPJ, Whincup P, Wannamethee SG

Publication type: Article

Publication status: Published

Journal: Journal of Epidemiology & Community Health

Year: 2019

Volume: 73

Issue: 7

Pages: 645-651

Print publication date: 10/06/2019

Online publication date: 19/03/2019

Acceptance date: 02/03/2019

Date deposited: 02/04/2019

ISSN (print): 0143-005X

ISSN (electronic): 1470-2738

Publisher: BMJ

URL: https://doi.org/10.1136/jech-2018-211719

DOI: 10.1136/jech-2018-211719

PubMed id: 30890591


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