[Importance of the study of renal function in cardiology].

Main cardiopathies, heart failure and ischaemic heart disease, share common risk factors with renal insufficiency and these clinical entities are often present in the same patient. This association has important implications in primary prevention as well as in cardiological patients and this is why the prevention, diagnosis and treatment of renal insufficiency and common risk factors are a relevant strategy in current cardiologic practise.