I'm no medical man and will accept that 'pressurised' is the wrong word.
However, the main argument is still true. There is no necessity to hold up such a bag, they are not gravity fed. No one remotely connected to medical work, would hold up such a bag. Ergo, the pictures are staged.
I am a physician with tons of experience using IV's. The IV fluid depends upon pressure to go into the vein in order to overcome the pressure of the blood within. Pumps can be used, but in the field, gravity (i.e. elevation) or external pressure on the bag is used to create that pressure. It is usual and expected to hold up the IV bag. In fact, I might suspect the scene was staged if I didn't see the iv bag held up, as it would be the automatic response.
Linda
