I'm not worried much about waking up after CPR - Wikipedia says only about 8% survive ("Bystander Conventional CPR").
I attempted CPR on a salesman at the farm equipment dealership I worked at 20 years ago. He didn't survive. I was struck by just how useless most people are in any kind of emergency.
I was working in the shop when Dean collapsed up front. When I got to the showroom, there were people standing around, looking shocked and fearful, while Dean lay face down on the floor. No one could even figure out to turn him over! Without some authority figure telling people what to do, they do... nothing.
My own experience with these kind of documents does not inspire confidence. My mom and stepdad both worked as nurses for many years, and my mother is a real stickler for filling out all paperwork and following all recommendations, etc., and that certainly applies to these "living will" documents.
When my stepdad collapsed at karate practice it was all for naught. The ambulance took him to the local Catholic hospital which apparently ignores these kind of documents. They worked on him for a very long time before restoring circulation, by which time there was extensive brain damage, and hooked him up to all the machines despite his written instructions.
It was a big deal to get him disconnected so he could die in peace. During a large family meeting at the hospital I practically had to torture the neuro into admitting that my stepdad would never recover. Once she acknowledged the reality of the situation in plain language, it was obvious what decision had to be made, and they moved him out of the ICU.
After the vent was removed he gasped for breath for many hours. I consider it cruel that they wouldn't give him enough morphine to end his suffering. Even our pets get better end-of-life treatment than humans on Medicare. I can't help thinking that hospitals are loath to let cash cows, errr, ICU patients, expire before the insurance is all used up.