Final answer:
A pressure dressing is tied over the wound to control bleeding, while a field dressing is tied just above the nearest joint to secure it in place and protect the wound.
Step-by-step explanation:
A pressure dressing is used to control severe bleeding and apply direct pressure to a wound. It is important to tie the knot for a pressure dressing over the wound to maintain the pressure and control bleeding effectively.
A field dressing, on the other hand, is used to cover and protect a wound. It is not necessary to remove the field dressing after a few minutes; it can be left in place until further medical treatment is provided.
It is also incorrect to tie the knot for a field dressing over the wound. The knot should be tied just above the nearest joint to secure the field dressing in place.
Learn more about Field dressings and pressure dressings