imperative (adj., adv.) – something that is very important or urgent (an imperative assignment where ‘imperative’ is an adjective); to give orders or commands in an authoritative tone (“It is imperative!” where ‘imperative’ is an adverb)
If a person collapses and stops breathing, it is imperative to compress the chest firmly and to clear the throat of obstructions to breathing. Mouth to mouth in an instance such as this is no longer recommended, as pumping oxygen through the heart and into the brain is seen as the best way to prevent brain damage until emergency services arrive.
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