There shouldn't be a knot to tie. The treatment for an open chest wound is to put a piece of plastic over it and tape it down on the sides so that air cannot get in or out of the wound. There's nothing to tie down anywhere in that.
You could be thinking of flail chest which has more to do with broken bones then an open chest wound. As an army medic I find your question soul crushingly confusing.
If you are not sure if a chest wound has penetrated the chest wall completely, treat the wound as though it were an open chest wound.
An Open Chest Wound (Sucking Chest Wound)
Umm, well if it was an open chest wound..there would be an obvious HOLE/CUT in your chest. you would be able to see it.
To stop air from entering the chest cavity and collapsing the lungs.
Coughing up blood, Sucking or hissing sound coming from the wound, frothy blood coming from the wound.
If you are not sure if a chest wound has penetrated the chest wall completely, treat the wound as though it were an open chest wound.
To treat sucking chest wounds, you should use an occlusive dressing to prevent air from entering the wound.
An Open Chest Wound (Sucking Chest Wound)
the edges of the sealing material for an open chest wound should extend how far past the edge of the wound?
Umm, well if it was an open chest wound..there would be an obvious HOLE/CUT in your chest. you would be able to see it.
pain, blood coming from the chest,
occlusive dressing.
You want sterile dressing for open wounds. If you put a dirty dressing on an open wound, you are increasing the likelihood for infections and diseases. But if all that you have is a ripped t-shirt to put on a wound, that is definitely better than nothing at all.
Bandages are the material used to secure dressings in place over a wound. As far as what to use, it depends on the wound. Typically, an open wound can be successfully dressed with gauze. In the field, we use either 4 x 4's or bulky gauze dressings for most wounds. In the case of an open chest or airway (neck) wound, we use what's known as an Occlusive Dressing, which is basically a thin cotton dressing covered with petroleum jelly. With most dressings, you use tape to secure the gauze in place by wrapping the dressing. With occlusive dressings, you secure three corners of the dressing with tape completely, but leave one corner either open, or loosely secured so that you can "burp" the dressing every 2 to 5 minutes to relieve pressure.
Coughing up blood, sucking or hissing sounds coming from a chest wound, frothy blood appearing from air bubbles coming from the wound
Um, a gaping hole in your chest Blood is a good indicator. A gaping hole in the chest.
All of the above sabc