Background: Chronic kidney disease (CKD) is an important risk factor for the progression of coronary artery disease (CAD).
Objectives: The purposes of this study were to quantify the prevalence of CKD in CAD patients from 14 countries from all World Health Organization regions and to evaluate the prognostic value of estimated glomerular filtration rate (eGFR) and urinary albumin/creatinine ratio (UACR).
Methods: A total of 4,548 patients with CAD were included (79.6% were males; age range: 18-80 years). They were assessed for eGFR and UACR 6 to 24 months after the CAD diagnosis. Complete information on kidney function and cardio-renal protective therapy was available for 3,865 patients and follow-up data after a median of 1 year were available for 3,577 (92.5%).
Results: CKD according to the Kidney Disease Improving Global Outcomes classification was present in 32% of whom 19.7% were classified as low-moderate, 6.9% as high, and 5.6% as very high risk. Without UACR, 51.3% of them would have been undetected. The primary event, first of cardiovascular death, myocardial infarction, stroke, and hospitalization for heart failure, was observed in 7.9%, with the highest incidence in the Kidney Disease Improving Global Outcomes high-risk group (men: 13.0%; women: 11.8%). This relationship was independent of other risk factors and evident soon after the index examination. Only a minority of the patients received adequate cardio-renal protective therapy.
Conclusions: Early screening for CKD in patients with CAD is important and should preferably include both eGFR and UACR to provide a complete diagnosis. Without UACR, half of those with CKD would remain undetected. Treatment with cardio-renal protective therapy was low, providing great potential for improvement.
Keywords: chronic kidney disease; coronary artery disease; prognosis; severity.
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