Discussion seems to agree it doesn't work. What works is calling 911 (or local emergency number), which gets help and instruction over the phone from experts in the latest. I've been doing CPR classes every few years for 30 years - a lot has changed over that time (but not once did I hear this for CPR - shock yes, but not heart problems), but they still teach CPR over the phone to surprisingly good results.

Yeah I doubt you would look like someone who could be trusted with saving a life if you did this in an emergency scenario