At our facility, we use the Thermogard hypothermia protocol which is a femoral or internal jugular catheter that has balloons that are filled with propylene glycol solution. The solution is in a console that you can control the target temp and how fast you want to cool or rewarm. Indications for hypothermia protocol are mainly a witnessed arrest and being unconscious. You wouldn't initiate this for a patient that was asystole, only shockable rhythms like mentioned above also. I've been an icu nurse at this facility for 3 years and I've seen wonderful outcomes with the thermogard vs basically ice packs/cooling blanket. It's super interesting, too!