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The cardiovascular diseases represent the chief cause of morbidity and mortality in Spain. The development of renal insufficiency has a definite prognostic value and modifies therapeutic options. Cardio-renal insufficiency (IC-R) is a differentiated entity, underestimated in our population, in which both cardiac and renal failure coexist. Patients with IC-R are genuine survivors of the application of diverse technologies and have a different hemodynamic and hydrosaline balance compared to that seen in patients with isolated cardiac or renal insufficiency. Early diagnosis and careful follow-up, both in hospital and at ambulatory level, along with a specific management, determine the prognosis of this entity. A key aspect in the control of these patients resides in the preservation of a delicate fluid balance, which is always individualized and personalized. This type of approach requires a particular type of training and mental attitude by healthcare professionals, with an integrated view of the multifactorial nature of IC-R. The design of a plan structured according to objectives and the full understanding of the individual equilibrium constitute the keystone in the management of IC-R. The present review, which is based on traditional concepts updated under a practical view, is aimed to call attention on a rapidly expanding clinical entitiy.