Which sign is considered a late indicator of hypoxia?

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Multiple Choice

Which sign is considered a late indicator of hypoxia?

Explanation:
Hypoxia tends to show up in a sequence: the brain is very sensitive to low oxygen, so early signs are neurocognitive or subjective, such as dizziness and headache from reduced cerebral oxygen delivery. Euphoria can occur with mild hypoxia but isn’t a reliable indicator and can vary between individuals. Cyanosis—the bluish discoloration of the skin and mucous membranes—appears only after a substantial amount of hemoglobin is deoxygenated, so it marks more advanced hypoxemia. Its visibility depends on lighting and skin tone, so it is not a dependable early cue. For these reasons, cyanosis is the late sign among the options.

Hypoxia tends to show up in a sequence: the brain is very sensitive to low oxygen, so early signs are neurocognitive or subjective, such as dizziness and headache from reduced cerebral oxygen delivery. Euphoria can occur with mild hypoxia but isn’t a reliable indicator and can vary between individuals. Cyanosis—the bluish discoloration of the skin and mucous membranes—appears only after a substantial amount of hemoglobin is deoxygenated, so it marks more advanced hypoxemia. Its visibility depends on lighting and skin tone, so it is not a dependable early cue. For these reasons, cyanosis is the late sign among the options.

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