Bluerover
Player Valuation: £50m
Oxygen has a number of different physiological effects. Following trauma patients can hyperventilate and any form of artificial ventilation (even with a face mask) can regulate breathing. When physical damage occurs to tissue pockets of hypoxia can develop in the affected tissue which causes increased irritation at nerve endings (which results in increased pain levels) and increasing the oxygen saturation of the blood can limit these effects. Additionally, and I know this seems odd, but the placebo affect associated with doing something that appears medical can distract a patient from the traumatic event that they are currently experiencing.
As posted elsewhere, the missus (a theatre nurse) said it was Nitrous Oxide, which acts as a pain reliever and can relieve anxiety. It is commonly used in surgery and for women in labour.
In fairness, the medics seem to have been really on the ball thank God.