This is something that is not emphasized in most CPR classes. My CERT trainer, a highly experienced fire captain, said he had witnessed seven truly successful recoveries - the patient eventually walked out of the hospital - spread over 300 incidents. Personally, I am 0 for 2, but I am glad I have the capability to render aid. CPR is way ahead of back pressure- arm lift, its predecessor in emergency resuscitation.
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Geezer in Chief