Abstract
Several studies confirm that continuous overhydration is associated with morbidity and mortality in dialysis patients. To determine hydration status in these patients, clinical parameters such as interdialytic weight gain, the presence of hypertension and episodes of intradialytic hypotension are generally used. Many techniques for assessing body composition in clinical practice have been described, but most are invasive, costly and difficult to apply in daily clinical practice. Electrical bioimpedance (BIA) is a noninvasive, inexpensive and easy to use technique that is being incorporated in nephrology to analyze body composition and hydration status objectively, complementing clinical evaluation and helping to identify patients with fluid overload. In this review, we specify the different methods for estimating dry weight by focusing on the techniques that can objectively help us to identify patients with fluid overload and increased risk of morbidity and mortality.
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