I find this mildly interesting:(Reflections in a pile of bullshit)

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2. As to the cpr point,

Former ent here. Not sure, but I rather suspect, the change was based not on any medical improvement, but rather, based on educational improvement.

The idea being that the previous (and likely, more medically beneficial) approach was too complicated, so that *in practice*, what rescuers did was a less-than-ideal mess.

The simpler teaching may have been a step down in theory, but an improvement in practice as they were easier for rescuers to remember and implement when the time came.

Again, this is semi-informed speculation based on vague recollections of conversations either former colleagues and an article or two I once read, all years ago. I'll readily admit my recollection could be faulty.