C-spine Definition

noun

(emergency medicine) A neckbrace.

When placing a C-spine on you must measure the person's neck precisely.
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(emergency medicine) The position in which a trauma patient's cervical spine is immobilized to prevent possible or further spinal injury.

Always maintain C-spine if there is even a chance that someone has hit their head or fallen.
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verb

To immobilize a person's neck and head.

His neck is broken you must C-spine him now!
Wiktionary
abbreviation