A winter house, a faulty boiler, and 'flu' in the whole family. Carbon monoxide poisoning is the chameleon dressed as the flu — and the pulse oximeter will reassure you while the patient dies. This Atlas edition walks the hour as a story: the 200-to-1 grip of CO on haemoglobin, why the border zones of the brain die first, the SpO₂ trap, co-oximetry with humility, oxygen from the first breath, the second toxin in every fire (cyanide), the hyperbaric debate told honestly (Weaver NEJM 2002 vs Cochrane), the delayed-neurological clock of 2–40 days, and the HOT FIRE exam answer. Grounded in the W…
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