■ Respiratory pattern

If regular, may be normal or hyperventilation. If irregular, usually Cheyne-Stokes

Irregular, especially Cheyne-Stokes or ataxic breathing

■ Pupillary size and reaction

Equal, reactive to light, li pinpoint from opiates or cholinergics, you may need a magnifying glass to see the reaction.

LTnequal or unreactive to light (fixed)

Midposition, fixed—suggests midbrain compression

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