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Continuous arteriovenous hemofiltration (CAVH) is a simple extracorporeal treatment for fluid overload, electrolyte imbalances, and removal of uremic toxins. The CAVH technique can be initiated rapidly and allows effective fluid removal without compromising cardiovascular status. This article describes two illustrative cases where CAVH was used to treat fluid overload accompanying in one case cardiogenic shock and in the other case septic shock. CAVH may have contributed to the removal of sepsis-related vasodilators as well as excess fluid. This therapy is an attractive alternative to hemodialysis in the critical care setting and may be the treatment of choice in hemodynamically unstable patients.