alt Hacker News"[…] people who undergo CPR outside of a hospital setting survive only 10 percent of the time. Within a hospital setting, CPR survival rates are only a bit higher — about 17 percent."
https://www.discovermagazine.com/health/contrary-to-popular-...
So it seems CPR has contributed little to the survivability of heart attacks.
This varies hugely around the country. The Utstein criteria are only a subset of cardiac arrests, but while in NY you might have 11% chance of survival, Detroit, 8%...
Rochester County, MN, King, Pierce and Thurston Counties in WA regularly battle each other for highest survival rates in the country, from high 30s, often in the 40s, even 49% survival.
-- paramedic in Washington