Puzzled by facies
Oxygen reverses hypoxia. Not Narcan.
The only situation I can think of naloxone being useful is a pseudo-PEA secondary to opioid induced hypotension (i.e. never).
Random anecdote, but I have seen more or less exactly this... the exact sequence wasn't clear, but it was a near-total PEA, textbook sinus on the monitor, nobody had any answers, until someone throw some naloxone down the IV on a whim and she started to come around. Odd one.