Continuous renal replacement therapy: an overview.

Continuous renal replacement therapy is a treatment option that is especially suited to the critical care setting. Greater hemodynamic stability, the ongoing ability to optimize fluid balance, and the potential for clearing inflammatory mediators are among the frequently cited advantages continuous veno-venous dialysis modalities offer over traditional intermittent therapies. The concept is simple: blood is pumped from the patient, anticoagulated, and passed through a porous filter where, depending on the desired goal, fluid and/or solutes are removed. The blood is then returned to the patient, without large fluctuations in electrolyte and acid-base balance or renal hypoperfusion. This article includes a review of acute renal failure, a discussion of the indications for continuous renal replacement therapy, the mechanisms of action of this therapy, and the nursing considerations.