Answer :

Final answer:

CPR is necessary during cardiac arrest to keep blood flowing particularly to the brain. It must be performed immediately and correctly, with training advised for effective application. Although there is risk, immediate CPR increases survival chances significantly.

Explanation:

Cardiopulmonary resuscitation (CPR) is needed when the victim is in cardiac arrest, which occurs when the heart no longer pumps blood effectively, posing a serious medical emergency. During CPR, repeated pressure is applied on the heart through chest compressions to manually pump blood, especially critical for maintaining brain function. The technique can be performed until a patient regains spontaneous heart contractions or is declared deceased by a healthcare professional.

It's essential to conduct CPR correctly to avoid injuries like broken ribs or damage to internal organs. Therefore, proper training for CPR certification is highly recommended for medical personnel and the public. Resuscitation should be attempted immediately, as brain cells can begin dying within minutes without oxygen, and there's a brief window where revival is possible.

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