Certified Nephrology Nurse Certification (CNN) Practice Exam

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What does hydrostatic pressure primarily influence during hemodialysis?

Hemoglobin level

Ultrafiltration

Hydrostatic pressure primarily influences ultrafiltration during hemodialysis. This is because ultrafiltration refers specifically to the movement of fluid across a semipermeable membrane driven by pressure differences. In the context of hemodialysis, hydrostatic pressure is created in the dialyzer, where blood is filtered. The difference in pressure between the blood compartment and the dialysate compartment allows excess fluid to be removed from the blood, effectively achieving the goal of ultrafiltration.

The process relies on the principles of fluid dynamics, where higher hydrostatic pressure on one side of the membrane facilitates the movement of fluid into the lower-pressure area. Therefore, understanding hydrostatic pressure's role in ultrafiltration is crucial for effective dialysis treatment.

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Electrolyte balance

Fluid absorption

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