Lolegas, you may find that a call of "is there a doctor on board" may fall on deaf ears, as no organisation appears to offer to indemnify health professionals acting on board aircraft.
A sad fact of the times I'm afraid, but we all think of the adverts with the smarmy guy claiming "where there's blame there's a claim !!"
Our professional bodies are (unofficially) advising us to keep quiet in the event of an incident mid flight, although we may be guided by our moral fibre (I can't spell consciounsse), to act otherwise !
Sad but true.