We have seenthis a fair bit. This stiffness seems to respond to naloxone. We've had to simply keep oxygen near a persons face as they were not breathing adequately and not ableto receive breaths. Constant rousing, naloxone and as much 02 as one can get tothem.
The best measure if this is opioid overdose is counting breaths, and even if someone's eyes are open, trying to give breaths if they are not breathing inhales and exhales.
I've seen a person continually trying to inhale because we kept snapping them out and saying "take a breath". So peeps have to be cued for exhales sometimes.