Low eGFR and albuminuria independently predict all-cause mortality in high-risk subjects undergoing coronary arteriography

Individuals with Chronic Kidney Disease (CKD) are at high risk for cardiovascular morbidity and mortality. The aim of this study was to examine the relationship between renal dysfunction and all-cause mortality in a sample of subjects undergoing coronary angiography (CA). We evaluated 1017 subjects who consecutively underwent CA. Glomerular filtration rate (eGFR) was estimated by CKD-EPI and urinary albumin excretion reported as urinary albumin-to-creatinine ratio. Vital status was ascertained by interrogating the Italian Health Card Database. One-thousand-seventeen subjects (759 M/258F) were enrolled into the study from 2016 to 2018. One-hundred-fourteen deaths occurred during a median follow-up of 44 months. The whole population was divided in two subgroups according to the presence/absence of low eGFR (i.e. < 60 ml/min/1.73 m²). Subjects with low baseline eGFR had a worse clinical profile than subjects with preserved kidney function. The risk of death in subjects with eGFR < 60 ml/min/1.73 m² was almost three times higher than in subjects with preserved kidney function: fully adjusted HR 2.70 (95% CI 1.56-4.67). The presence of albuminuria also predicted a high risk of death: fully adjusted HR 2.09 (95% CI 1.17-3.73) and HR 4.26 (95% CI 2.18-8.33), microalbuminuria or macroalbuminuria, respectively, being normoalbuminuria the reference group. Again, the increased risk remained significant after adjusting for several potential confounders. In conclusion, kidney disease measures (i.e. low eGFR or albuminuria) independently predict increased risk for all-cause death in a large sample of subjects undergoing CA. These results have a relevant clinical impact.