As a Midwife, this thread is very interesting from my point of view within a clinical setting. We routinely respond to compromised patients by, amongst other interventions, providing 100% O2 for up to and beyond 4 hrs.

This is often initiated by the Midwife whilst awaiting medical personnel to attend in the case of an emergency. Although it's not often realistically carried out, O2 is classed as a drug and should be prescribed by a Doctor.

I wonder what implications this will have in clinical practice as well as the impact these findings will have outside of a hospital... I'll have to keep my ear to the ground on this subject!