If by bag you mean lung...the only thing it could fill up with could be blood. I believe it's referred to as a 'collapsed lung' and would not only be spilling out blood fairly quickly in this case, but it might even choke your protagonist as the blood 'backs up' down the esophagus and up the nasal cavity and the mouth. That is, if he or she (let's just say he) can get the exterior hole shut. Some blood might even make its way to the other lung at first. If he survives there's going to be lots of scarring inside the lung if it can be reinflated (read: can be saved). I'm no doctor, much less a trauma surgeon or forensic analyst, of course.
I found this about arrows, which is similar but not quite the same. In some ways it's worse, but the quick removal of that rod will make these different, since they stay until removed. Your situation has the added complications of trouble breathing (from the blood and collapsed lung), and severe blood loss.
Warning..the following is...gross.
Quote:
Novel techniques to treat arrow wounds were sometimes used, such as in 1881 after a Comanche arrow struck an Army officer, whose name was not revealed. According to a verbal report of the incident, "The weapon pierced the upper part of the right chest and passed nearly horizontally through the lung, the point protruding at the back between the scapula and the spine." At the wounded officer's request, "a silk handkerchief was fastened to the shaft, which was then pushed through his body, dragging the silk after it through the whole extent of the wound." Although the usefulness of this treatment is puzzling, the valiant soldier recovered and spent many more years on active duty in the Indian wars....
An arrow entered Martinez's chest between the fifth and sixth ribs on the right side and exited between the seventh and eighth ribs on the left. When physician J.H. Bill saw him, Martinez had already removed the arrow and was vomiting blood. After being hospitalized at Fort Defiance (in Navajo country) and taking half a grain of sulphate of morphia (morphine) at bedtime, the injured man rallied somewhat. The next morning he was given an enema comprising about half a pint of beef essence and 2 ounces of wine whey. He threw up again and was given half a grain of morphine. Enemas, morphine and even iced champagne were part of Martinez's rocky course of treatment until he died 18 days later. An autopsy revealed a solidified right lung engorged with pus and a left lung with a hole the size of a turkey's egg, also filled with pus. The arrow had wounded both lungs, the liver and the stomach.
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http://www.thehistorynet.com/we/blar...st/index1.html
[ 07-21-2005, 08:31 PM: Message edited by: Lucern ]