The best figure I have heard is about a 30% save rate. A lot depends upon your definition of "success." When it comes to saves, I am 0 for 2, but I comfortable that at least I was able to make a positive effort, and I'll bet the relatives appreciated that,as well. I am in favor of extensive training in both CPR and at least rudimentary first aid.

We had an incident some years ago where a hunter shot himself in the thigh. He bled to death before rescue people arrived on scene, finding that the only first aid his companions had rendered was to loosen his belt (!)