Final answer:
Option B is not an advantage of a hollow-fiber dialyzer because a higher dosage of heparin to prevent clotting in the fibers is a potential drawback, not a benefit. The other options listed are all advantages associated with this type of dialyzer used in hemodialysis.
Step-by-step explanation:
The question is asking to identify which option is not an advantage of a hollow-fiber dialyzer. A hollow-fiber dialyzer is a type of dialysis equipment used in hemodialysis to remove waste products such as urea from the blood.
Option A states that the resistance to blood flow is low in a hollow-fiber dialyzer, which is indeed an advantage as it makes the process more efficient. Option C indicates that hollow-fiber dialyzers are adapted to reuse, which is beneficial as it can help reduce costs and waste. Option D points out that ultrafiltration can be precisely controlled in a hollow-fiber dialyzer, which is an advantage because it allows for better management of the fluid removal process.
However, option B, which suggests that patients may require a higher dosage of heparin to keep the hollow fibers from clotting, would not be considered an advantage. It is a potential disadvantage as the need for increased heparin dosage introduces additional risks and complications for the patient.