What can cause phlebitis mechanically?

Phlebitis occurs when there is inflammation of a vein, often as a result of mechanical irritation. Using an oversized catheter in a small vein is a prime contributor to mechanical phlebitis. This occurs because the larger catheter can create excessive pressure against the vein wall, leading to trauma and irritation. The mismatch between catheter size and vein diameter can result in damage to the endothelial lining of the vein, promoting inflammation and increasing the risk of phlebitis.

In this case, the issue arises not only from the physical presence of the catheter but also from the improper size, which can significantly increase the chance of irritation and subsequent inflammation. Understanding this relationship is crucial for preventing complications associated with IV therapy, such as phlebitis, particularly in clinical settings where proper catheter selection is vital for patient safety.