What flush technique is used to maintain patency and reduce catheter occlusion after administering a drug through a central venous catheter?

• A. Use continuous saline infusion
• B. Flush saline using push-pause method
• C. Flush with heparin only
• D. Do not flush after administration

Answer: (B)

The key idea is using a flushing technique that reliably clears the catheter lumen after drug delivery to keep it open. Saline flush with a push-pause method creates brief, turbulent flow that effectively pushes residual medication out of the catheter and disrupts any early clotting inside the lumen. This mechanical cleansing helps prevent occlusion and maintains patency more reliably than a simple continuous flush or no flush at all.

Continuously infusing saline isn’t as targeted for a single administration and can cause fluid overload, and flushing with heparin alone doesn’t ensure the lumen is cleared of residual drug or early clots after each dose. Not flushing after administration guarantees a higher risk of occlusion and catheter dysfunction.