A nurse is educating a client about the different types of dialysis. The client asks which type of dialysis uses the peritoneal membrane as a filter. Which of the following responses by the nurse is accurate?
A “Hemodialysis uses the peritoneal membrane as a filter.”
B “Continuous ambulatory peritoneal dialysis (CAPD) uses the peritoneal membrane as a filter.”
C “Automated peritoneal dialysis (APD) uses the peritoneal membrane as a filter.”
D “Peritoneal dialysis does not use the peritoneal membrane as a filter.”
The correct answer and Explanation is :
The correct response is B “Continuous ambulatory peritoneal dialysis (CAPD) uses the peritoneal membrane as a filter.”
Explanation:
Dialysis is a medical treatment used to remove waste products and excess fluid from the blood when the kidneys can no longer perform these functions effectively. There are two main types of dialysis: hemodialysis and peritoneal dialysis.
Hemodialysis involves the use of an artificial kidney (dialyzer) that filters blood outside the body. During hemodialysis, blood is drawn from the body, passed through the dialyzer where it is filtered, and then returned to the body. This method does not use the peritoneal membrane; rather, it relies on a machine to perform the filtering process.
Peritoneal dialysis (PD), on the other hand, utilizes the peritoneal membrane, which is the lining of the abdominal cavity, as a natural filter. There are two primary forms of peritoneal dialysis:
- Continuous Ambulatory Peritoneal Dialysis (CAPD) – This is a manual form of PD where the patient fills their abdominal cavity with dialysis solution, allowing waste and excess fluid to pass from the blood through the peritoneal membrane into the solution. After a set dwell time, the solution, now containing waste products, is drained from the abdomen.
- Automated Peritoneal Dialysis (APD) – This form uses a machine to automatically perform the filling and draining cycles, typically while the patient sleeps.
Both CAPD and APD use the peritoneal membrane for filtration, but the question specifically asks for the type of dialysis, making option B the most accurate response. Understanding the mechanism of these dialysis types is crucial for patient education, as it helps clients grasp how their treatment works and the importance of their adherence to prescribed procedures.