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All this is quite interesting. tursiop's listing of the PADI procedures seems to be exactly what I learned in PADI Rescue in 2006, so I guess that hasn't changed (much?).If my memory serves me correctly, one of the most frustrating experiences I had before I turned pro was taking PADI's Rescue Diver course and SSI's Stress & Rescue is that they said the OPPOSITE thing when it come to deciding on whether to do rescue breaths. One said if close to shore, do rescue breaths and haul in as fast as you can. If far from shore, skip the rescue breaths. The other said the opposite. You'd think there would be some medical based decision that would ensure that different agencies taught the same thing.
I always made a big deal about CPR procedures changing, sometimes in what appears to me to be willy-nilly--change for change's sake. Until someone explained the 5 year periods of data collecting they go through. tursiops also points out that there is limited research suggesting the advantages of inwater rescue breaths outweighing this (the) potential disadvantage.
It would be interesting to know exactly how the "limited research" is done. And perhaps how much, if anything, that is taught in Rescue courses is based on logic rather than the limited research.
I would guess the only way to collect data would be to ask the rescuer what they did-- this may not happen since the patient either survived or didn't, so end of story (?).