A patient arrives after a suspected cyanide poisoning in an industrial fire. Which finding MOST suggests cyanide toxicity rather than carbon monoxide poisoning?
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A
Elevated carboxyhemoglobin on co-oximetry
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B
Metabolic acidosis with elevated lactate despite high-flow oxygen
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C
Decreased oxygen saturation on pulse oximetry
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D
Cherry-red skin discoloration with headache