Which device should a nurse use to deliver IV fluids at a continuous rate of 175 mL/hour?

• A. Portable syringe pump.
• B. Cassette infusion pump.
• C. Volumetric controller.
• D. Nonvolumetric controller.

Answer: (B)

The appropriate device for delivering IV fluids at a continuous rate of 175 mL/hour is a cassette infusion pump. This type of pump is designed for administering fluids accurately and consistently over a specified period. It allows for precise control of the infusion rate, which is crucial for maintaining patient safety and ensuring that medication levels remain therapeutic.

A cassette infusion pump typically uses a preloaded cassette that contains a pump mechanism to push the fluid with a specific flow rate. This ensures that the 175 mL/hour rate can be maintained accurately over time, even with changes in the pressure within the IV line or changes in patient conditions.

Other devices, such as a portable syringe pump, may not provide the same level of precision for larger volumes and continuous infusions, making them less suitable for this specific rate. Volumetric controllers might also lack the advanced features for continuous flow rates, while nonvolumetric controllers often do not allow for the same degree of precise rate adjustments, particularly important for more stable environments or when dealing with medications that require strict monitoring.