Ten minutes after a benzocaine throat spray: slate-grey lips, a saturation of eighty-four, and oxygen changes nothing. The arterial gas says ninety. The calculated saturation says ninety-eight. This Atlas edition walks the whole condition: the ferric iron that cannot carry or release oxygen, the two-wavelength oximeter stuck at eighty-five, the chocolate-brown blood, the oxidant shelf (dapsone, benzocaine, nitrates), the severity ladder, and methylene blue — one to two milligrams per kilogram, with the G6PD hinge and the SSRI warning — plus the alternatives when blue is barred. Education — n…
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