Describe the procedure for establishing IV access in an emergency setting.

The correct procedure for establishing IV access in an emergency setting typically involves several essential steps to ensure both the sterility of the procedure and the effectiveness of the IV line. Starting with cleaning the site, this is crucial as it reduces the risk of infection. Following that, applying a tourniquet helps to engorge the veins, making them easier to cannulate. After preparing the site, the catheter is then inserted into the vein, and finally, securing it with a dressing is important to prevent dislodgement and maintain patency.

Option B encapsulates this process in the correct order and highlights the importance of each step in ensuring a successful IV insertion. The reasoning behind these steps is rooted in infection control protocols and access success, which are critical in emergency medicine where timely and effective treatment is vital. Securing the catheter afterwards with a dressing ensures that the site remains closed and protected, allowing for medication administration or fluid resuscitation as needed without complications.