Medical Surgical Renal Failure #3

Question

A client has been newly diagnosed with chronic renal failure and will be receiving hemodialysis. Which statement describes the function of hemodialysis? Select all that apply.

Answers

  1. Cleans the blood of waste products.
    • Rationale:

      This answer is correct because hemodialysis cleans the blood of waste products. This is done with the assistance of a machine called a dialyzer. The client’s blood is transferred into the machine and filtered and then returned to the body.

  2. Rids the body of excess fluids.
    • Rationale:

      This answer is correct because this is called ultrafiltration. Ultrafiltration in hemodialysis removes excess body fluids. It does this by moving fluid across a semipermeable membrane resulting from an artificially created pressure gradient.

  3. Removes protein by-products.
    • Rationale:

      This answer is correct because the by-products of protein are dialyzed through the membrane and washed away. These by-products are smaller waste products, unlike protein and bacteria, which are too large to pass through the membrane. This membrane allows small particles to pass through.

  4. Abolishes the acid-base balance.
    • Rationale:

      This answer is not correct because hemodialysis restores the acid-base homeostasis of the body. The most common acid-base disturbance in clients in renal failure is metabolic acidosis. This restoration is achieved by the addition of bicarbonate to the dialysate fluid.

  5. Restores electrolyte levels.
    • Rationale:

      This answer is correct because the dialysate fluid is composed of water and electrolytes. The dialysate fluid must meet specific standards to ensure proper electrolyte balance. Once this has been attained, homeostasis is reached.

Overview

Hemodialysis cleanses the blood of a client whose kidneys are not functioning properly. This process is done by transferring the client’s blood into a machine called a dialyzer which has membranes that filter the blood through dialysate fluid and then returns the blood back into the body.

Explanation

Learning Outcomes

Hemodialysis cleanses the blood of a client whose kidneys are not functioning properly. This process is done by transferring the client’s blood into a machine called a dialyzer. The dialyzer filters the blood through membranes and through dialysate fluid and then returns the blood back into the body. This process eliminates waste products from the blood. Excess fluid is removed from the body through ultrafiltration. Smaller waste products are filtered through a membrane that’s pores are small enough to allow passage of these smaller particles. The restoration of appropriate acid-base balance is achieved by the addition of bicarbonate to the dialysate fluid.

Test Taking Tip

Understand the hemodialysis process.

Video Rationale