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Early CPR is crucial in cardiac emergencies primarily because it pumps blood containing oxygen to vital organs. When a person's heart stops beating effectively, the blood flow to the brain and other essential organs quickly diminishes. CPR, which involves chest compressions, creates artificial circulation that helps to maintain a minimal blood flow, delivering oxygen to the brain and other critical areas until professional medical help can take over.

This oxygenation is vital because brain cells can start to suffer irreversible damage within minutes without an adequate supply of oxygen. By maintaining some level of circulation, CPR significantly increases the chances of survival and reduces the risk of long-term neurological damage. The importance of early intervention cannot be overstated, as each moment that passes without CPR diminishes the likelihood of positive outcomes in cardiac arrest situations.