Long-time Slashdot reader schwit1 shared this article from HealthDay:
In earlier studies, patients have pegged CPR survival rates at between 19% and 75%. But the real rate of survival is about 12% for cardiac arrests that occur outside hospitals and between 24% and 40% for those that happen in the hospital, according to the report published online July 13 in the Emergency Medicine Journal.

For the new study, Bandolin’s team surveyed 500 emergency department patients and their companions. Fifty-three percent said they had done or witnessed CPR, and 64% had taken a CPR course. Ninety-five percent said their main source of CPR information was television. About half said the success rate of CPR topped 75%. And nine out of 10 said they wanted to receive CPR if it was needed.
But only 28% had discussed CPR with a doctor, the investigators noted in a journal news release.

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Source:: Slashdot