Hello Pilotwolf
I work offshore as a Medic - travel and use of helicopters is routine for crew changes and essential on Medivac's. We are all aware of the safety aspects of helicopters and professionalism of the Pilots which we never take for granted.
If Defib has to be used in a helicopter - the pilot must be advised before a shock delivered. I have asked many other medics (and only a few Pilots)from their experiences but, like yourself, never get a conclusive answer.
In our scope offshore, the reality is not many workers thankfully have the need defib'd whilst in the chopper - it will either be utilised in the Sick Bay or on arrival onshore.
As a PPL myself, it would be interesting to know more on this subject - God forbid one day I may well find myself in this situation. Until then I will take my que from the Pilot in this respect.
I wonder if our American colleagues, namely Flight Paramedics or Flight Physician Assistants and their Pilots may enlighten us - PLEASE respond!
Kind regards
SkyMed