I was at a first aid class a while back and it really struck me how useful having an oxygen tank(s) on hand could be during an emergency (SHTF or not), especially if first responder help is not immediately available. Very minimal oxygen is delivered to the brain during cpr, and it seems like the basic hope of cpr is keeping just enough oxygen to the brain until help (w/oxygen) arrives. Of course oxygen is not the only consideration during a medical emergency, but putting a mask delivering pure oxygen to an unresponsive person while giving compressions seems light years ahead of a couple breaths every minute of already used oxygen. (Owning and being trained with a defibrilator (sp?) could be amazingly helpful if someone had the funds for that as well.) Also, in the event of any SHTF scenario, but especially if it's sudden and destructive, I bet episodes of shock will be fairly prevalent, and first responder help probably a long time in coming. It sounds like what is most needed in event of shock, especially serious cases which can lead to death, is oxygen to the brain. I am not a medical expert, but it seems like having some oxygen on hand could easily be the difference between life and death in some situations. In fact, I'm really surprised it is not more well-known and considered more of an essential item by society at large, since it is not very expensive and fairly easy to administer, and absolutely critical in some emergencies. I've heard that Intel does include oxygen tanks in their emergency items. I don't know anything about how long a given size tank of oxygen will last, and if we're talking widespread disaster I can't imagine it being easy or possible to refill, and I've never been trained it its use. Maybe someone with some experience can give their thoughts on the idea, and some practical insight. I haven't noticed this being much talked about in the prepper community, but especially if someone in your household may be predisposed to heart attack or shock, this might be a critical item. I imagine there being non-medical uses as well. What do you think?