Using the minimum - better - best paradigm, what is the best option for flushing an intravenous catheter?

• A. Every 2 hours
• B. Every 4 hours
• C. Every 6 hours
• D. Only after use

Answer: (B)

Maintaining IV catheter patency relies on a regular maintenance flush rather than waiting until use or flushing excessively. The concept in play is choosing a cadence that keeps the lumen open during idle periods without causing unnecessary irritation or workload.

Flushing only after each use leaves the line unflushed during times it’s idle, which increases the risk of clot formation and occlusion. Flushing more frequently than needed doesn’t provide meaningful additional protection and just adds unnecessary handling and potential vein irritation. The moderate, regular maintenance cadence sits between these extremes and aims to keep the catheter patent through periods of nonuse while avoiding overuse of resources.

So, the best choice is the intermediate maintenance flush interval, as it balances maintaining patency with practicality and safety.