I don't think you necessarily die if you lose power to these things:
Respiratory Support
CPAP Machines: For sleep apnea.
Oxygen Concentrators/Tanks: For oxygen therapy.
Nebulizers: Deliver medication in mist form for asthma/COPD.
I was thinking iron lung.
if you need oxygen, you need oxygen… but as far as the CPAP machine goes unless it’s a CPAP machine that also gives oxygen you’ll be OK for a few days without it… some CPAP machines do give oxygen as well…