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Ok but if I'm off base here do tell. I haven't researched this it is mere personal opinion.
My understanding of O2 in those instances was that it relieved pain due to an effect on an underlying condition or a change of state occurs. This contrasts in with other pain relief as the pain relief we give does nothing for the the cause but depressant for the signals so you don't feel it.
Also I have found, all be it limited, that if you apply o2, and I'm assuming compressed air will work too, the pt often reports a decrease in pain. Coupled if you tell them it will help with the pain it helps quite a bit.
My understanding of O2 in those instances was that it relieved pain due to an effect on an underlying condition or a change of state occurs. This contrasts in with other pain relief as the pain relief we give does nothing for the the cause but depressant for the signals so you don't feel it.
Also I have found, all be it limited, that if you apply o2, and I'm assuming compressed air will work too, the pt often reports a decrease in pain. Coupled if you tell them it will help with the pain it helps quite a bit.