I think the general public needs to know that pretty much every patient having chest compression that I've seen being brought into the ER have been dead. That's roughly 0/100. Now if it happens in front of you, a MD, now that's a different story - maybe 30-40% go on and live their lives.
Movies portray CPR, resuscitation, end of life, defibrlllation (the heart "jump start" paddles), etc, in a wholly unrealistic way, and I think it's wrong to continually mislead the public. They have no idea about breaking multiple ribs on the persons chest, electric burns from the defibrillator, brain damage from hypoxia, etc
There may be differences between the above mentioned methods of CPR, but I bet they are trivial, and even more so for the general public.
I'm an oncology surgeon still taking trauma call, and I've seen more than my fair share of death. There are many things we can do to prolong life, but until you, or a loved one gets to that point, then it's hard to say what you will do, and how much you will panic at losing a loved one.