Background: Chronic kidney disease is a major health problem since it is associated with a high cardiovascular risk, total morbidity and mortality, increasing prevalence and high cost treatment. Aim: To assess the frequency of chronic kidney disease among patients consulting in a cardiology clinic. Material and methods: Cross-sectional assessment of 649 patients attended at a cardiology clinic. Demographic, clinical, electrocardiographic, echocardiographic and laboratory variables were registered. Patients were considered to have a kidney failure when their estimated glomerular filtration rate was