Determining the water balance in the HF can be complex and depends largely on the underlying pathophysiology.
In HF, fluid overload defined as a positive cumulative balance or acute fluid redistribution, represents the precipitating core of the mechanism of acute decompensation and is associated with a worsening of symptoms, hospitalisation and death. 1-5 In this review, we attempt to provide a general vision of the pathophysiology of fluids accumulation focused on HF and ARF, as well as the importance of the evaluation of water balance on these syndromes and its correlation with the results. Heart failure (HF) and acute renal failure (ARF) are common and they are associated with great consumption of health resources as well as a considerable morbidity and mortality.
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