Final answer:
The advantage of centrifugal pumps over roller pumps for CPB is reduced hemolysis, which refers to less destruction of red blood cells caused by gentler pumping action.
Step-by-step explanation:
An advantage of centrifugal pumps over roller pumps for cardiopulmonary bypass (CPB) is reduced hemolysis. Hemolysis is the rupture or destruction of red blood cells, which can be a significant issue in blood-handling medical devices. Centrifugal pumps are preferred in some cases because they are designed to provide gentle pumping action that minimizes cell damage. Roller pumps, although effective for moving the blood, can cause more trauma to blood cells leading to increased hemolysis due to the mechanical action of the rollers compressing the tubing that contains the blood.