@Shaggywang (damn, I feel really dirty typing out your username), I posted the same thing in another thread, but perhaps not so clinical in description,(the difference being that I frequently need to take CPR/First Aid classes for my job, but it is NOT my sole job), but I had ultimately reached the same conclusion.
Looking back in hindsight, I don't think there could have been anyway to really save Larry, apart from the writers pulling "magic" and having him make an instant full recovery. We know that the Walkers overrun the Farm in the end. Larry was a big dude, and would have probably been completely unconscious, at least not capable of turning tail and running. We know that every single adult there is suffering from malnourishment, and probably in a weakened state. It would have been a "Great, we saved his life to have to leave him behind for the Walkers!" type scenario.