Atropine is mostly deprecated in cardiac arrest scenarios nowadays. It's still in-protocol for brady PEAs, but that's about it.
Rapid cooling is becoming very widespread in post-ROSC situations (we're spec'ing a chiller box for saline in our next rigs for that very reason), but if they're still dead, cooling them isn't likely to do much for them.
It would be really interesting to see cooling applied to dive medicine (I dive, and a friend of mine is a Canadian Forces MD who did a hyperbaric/dive med fellowship at Duke, so I read some papers on this stuff more than I would otherwise). Also seems like it could be really useful for flight medicine/extended distance transport post ROSC/etc.
Rapid cooling is becoming very widespread in post-ROSC situations (we're spec'ing a chiller box for saline in our next rigs for that very reason), but if they're still dead, cooling them isn't likely to do much for them.