Maybe not exactly first aid but we once encountered a lost alzheimer's patient. So what to do in that situation.
IDENTIFICATION!!!!!!
When Sam was killed, we knew who he was and lots of info, but we did not have his wife's cell phone number. We had to drive to her parents house to get it. It was at least one and a half to two hours after he was hit and he passed away about on hour after the hit.
Including my own, I've encountered 5 wrecks requiring medical attention. Only one was life treatening and no amount of first aid could have helped. 
"Being retired from Biking...isn't that kinda like being retired from recess?" Stephen Colbert asked of Lance Armstrong