Final answer:
CVVH is used to remove fluids and solutes from the blood by combining ultrafiltration, convection, and dialysis, which includes the use of a dialysate.
Step-by-step explanation:
Continuous venovenous hemofiltration (CVVH) is a renal replacement therapy often used in patients with acute kidney injury, particularly in those who are hemodynamically unstable. The question at hand is asking about what this process entails:
Continuous venovenous hemofiltration is used to:
- Remove fluids and solutes through the process of convection (Option a).
- Remove plasma water in cases of volume overload (Option b).
- Remove plasma water and solutes by adding dialysate (Option c).
- Combine ultrafiltration, convection, and dialysis (Option d).
The correct answer to this question is option d: Continuous venovenous hemofiltration combines ultrafiltration, convection, and dialysis. In this process, blood is passed through a filter to remove waste products and excess water. The filtered blood is then returned to the body. This method allows for the removal of substances by convection and filtration, leading to the clearance of both fluids and solutes. The addition of a dialysate enhances the removal of solute by the process of diffusion, which complements convection in the clearance process.