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In the CAB sequence, which is a critical framework for providing effective basic life support, the "C" stands for Compressions. This sequence emphasizes the importance of prioritizing chest compressions as the first action in a cardiac arrest scenario.

Compressions are central to maintaining blood flow to vital organs when someone's heart has stopped beating effectively. Delivering high-quality chest compressions ensures that oxygen-rich blood continues to circulate, thereby buying time until further advanced medical care can be provided or until an automated external defibrillator (AED) is available.

In this context, emphasizing compressions first is essential, as it takes precedence before assessing the airway or providing rescue breaths. This approach is based on research that highlights the importance of early compressions in improving survival rates from cardiac arrest.

Understanding this framework and the significance of the "C" in CAB is crucial for anyone trained in basic life support, as it guides responders on the most effective actions to take in an emergency.