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[Prognosis evaluation in the critically ill with acute renal failure].

Acute renal failure (ARF) is highly incident among hospitalized patients, especially in intensive care units. ARF carries an independent and significant risk for increased mortality, morbidity, and health resources usage, both in the short- and the long-term perspective. Many controversies exist concerning the epidemiological and prognostic aspects of ARF. Key problems are the lack of a widely accepted ARF definition, the poor knowledge of the pathophysiological mechanisms of complications peculiar to ARF, and the unavailability of prognostic tools able to adequately express the medical complexity of the syndrome. These aspects are fundamental with regard to ARF prevention, a strategic goal in the approach to the syndrome; therefore, they will analyzed in depth in this review.