Responded to a code the other day. I wandered down to the ER where EMS was just delivering a guy they said was in "fine v-fib". Apparently he was found "unconscious" and EMS was called. They were performing chest compressions and ambu-bag mask ventilating the guy. I thought gee, that's strange he isn't intubated; usually EMS intubates cases such as this.

I got to the head of the bed when the EMT guy said they couldn't ventilate because they couldn't get the mouth open. I tried but the jaw was rigid. It would not open at all. Upon further evaluation the fine v-fib was really asystole and the rigidity was not limited to the jaw.

Have to say, this is a first for me. It was impressive the degree of lock-jaw / rigor mortis.