In most cases you are correct, an exception is a lightning strike. Random Google coughed up this result "CPR usually has a success rate of 10% or less. In cases of lightning injury, CPR can have success rates of up to 90%. As such, normal rules of triage do not apply. If you find someone without a pulse or respirations after a lightning strike, begin CPR immediately." [1] [1]http://www.wildernessutah.com/learn/lightning.html