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To determine âcessation of all functions of the entire brain, including the brain stem,â physicians must determine the presence of unresponsive coma, the absence of brainstem reflexes, and the absence of respiratory drive after a CO 2 challenge.
Therefore, if you find the person unresponsive and not breathing this means the heart is not working. When you assess breathing look for movement in the chest. Take at least 5 seconds but no more than 10 seconds (1) to scan the chest.