When cannulating a new arteriovenous (A-V) fistula, what should always be applied?

When cannulating a new arteriovenous (A-V) fistula, the application of a tourniquet is crucial for several reasons. The primary purpose of the tourniquet is to engorge the veins, making them more prominent and easier to access. This engorgement helps to facilitate successful cannulation by allowing healthcare providers to see and palpate the vessel more effectively.

Additionally, using a tourniquet minimizes the risk of puncturing other nearby structures and ensures that the cannulation is performed cleanly and efficiently. It provides better visibility and access to the fistula, which is especially important when dealing with newly created A-V fistulas that may not be as well established or matured as older ones.

While antiseptic solutions, wraps, and compression bandages are also important in the cannulation process for purposes such as infection prevention and post-cannulation care, their role does not directly aid in the visualization or accessibility of the A-V fistula during the actual process of cannulation as the tourniquet does.