Background: The role of the coronary artery calcium score (CACS) in incident chronic kidney disease (CKD) in asymptomatic young populations remains unclear. The aim of this study was to evaluate the association between CACSs and CKD development in adults.
Methods: A cohort study of 113 171 Korean adults (mean age 40.6 years) without CKD and proteinuria at baseline who underwent a cardiac tomography estimation of CACSs during health screening examinations was performed (median follow-up 4.2 years). The outcome was CKD, defined as an estimated glomerular filtration rate (eGFR) <60 ml/min/1.73 m2 and/or the presence of proteinuria. Hazard ratios (HRs) and 95% confidence intervals (CIs) for CKD were estimated using Cox proportional hazards regression analyses.
Results: A higher CACS was moderately associated with an increased risk of CKD in a dose-dependent manner. The multivariable-adjusted HRs for CKD comparing CACSs 1-100, 101-300 and >300 with a CACS of 0 were 1.15 (95% CI 1.05-1.25), 1.37 (95% CI 1.13-1.66) and 1.71 (95% CI 1.32-2.22), respectively (P for trend <.001). When CKD was defined using low eGFR and proteinuria separately, corresponding HRs for low eGFR were 1.31 (95% CI 1.05-1.62), 1.41 (95% CI 0.95-2.11) and 1.86 (95% CI 1.16-3.00), respectively (P for trend = .001), while the HRs for proteinuria were 1.11 (95% CI 1.02-1.21), 1.32 (95% CI 1.07-1.64) and 1.57 (95% CI 1.16-2.12), respectively.
Conclusions: A higher CACS was progressively associated with an increased risk of CKD, even at low CACSs. Individuals with a CACS >0 appear to have an increased risk of CKD and may benefit from preventive measures to reduce CKD risk.
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