A nurse notes an IV infusion rate of 250 mL/hr. Which action helps maintain vein patency without altering the prescribed rate?

• A. Slow the IV infusion to keep vein open rate
• B. Increase the rate to speed hydration
• C. Turn off the IV and reassess
• D. Request a new IV site

Answer: (A)

Keeping the IV line patent means preventing blockage so the patient can continue receiving the prescribed therapy without interruption. The best way to do this while preserving the order is to set a keep-vein-open, or maintenance, rate. By lowering the continuous infusion to a minimal flow, you maintain some forward flow through the catheter, which helps prevent clotting or catheter occlusion and keeps the line ready for the full prescribed dose to continue on schedule. This approach avoids stopping the infusion or changing the total amount given, and it avoids moving to a new site unless the current line is failing.

Increasing the rate would alter the prescribed order and could lead to fluid overload or unintended dosing. Turning off the IV would halt therapy and require reassessment and resumption that delays treatment. Switching to a new IV site changes the access but doesn’t directly address maintaining patency on the current line, and it introduces a new line with its own risks. The keep-vein-open rate specifically targets sustaining access without interrupting the intended treatment. In practice, this rate is kept low (often a small milliliter-per-hour amount) and the line is monitored for patency, with flushes performed per protocol.