Transmembrane pressure reflects which across the dialyzer membrane used to achieve the desired fluid loss?

Transmembrane pressure reflects which across the dialyzer membrane used to achieve the desired fluid loss?

• A. Osmotic pressure
• B. Total pressure
• C. Venous pressure
• D. Hydrostatic pressure

Answer: (B)

Transmembrane pressure is the net driving force for ultrafiltration across the dialyzer membrane. It represents the total pressure difference pushing water from blood to dialysate, taking into account the pressures on both sides of the membrane (and the opposing influence of protein oncotic pressure). That overall, combined pressure difference is what determines the fluid removal you achieve during dialysis. Osmotic pressure plays a role in solute movement, but it is not the net driving force for ultrafiltration. Venous pressure is just a location-specific pressure, and hydrostatic pressure is part of the calculation but does not alone describe the full driving force.

Transmembrane pressure is the net driving force for ultrafiltration across the dialyzer membrane. It represents the total pressure difference pushing water from blood to dialysate, taking into account the pressures on both sides of the membrane (and the opposing influence of protein oncotic pressure). That overall, combined pressure difference is what determines the fluid removal you achieve during dialysis. Osmotic pressure plays a role in solute movement, but it is not the net driving force for ultrafiltration. Venous pressure is just a location-specific pressure, and hydrostatic pressure is part of the calculation but does not alone describe the full driving force.