What occurs during the C-A-B sequence in CPR?

The C-A-B sequence in CPR stands for Compressions, Airway, and Breaths, which reflects the recommended approach for performing high-quality cardiopulmonary resuscitation. This sequence emphasizes the priority of chest compressions because they are crucial for maintaining blood flow to vital organs during cardiac arrest.

Starting with compressions ensures that oxygenated blood can be circulated to the heart and brain, which is essential within the first moments of cardiac arrest. Immediate chest compressions help to mechanically pump blood until advanced medical help arrives or until an automated external defibrillator (AED) can be used.

After establishing effective compressions, the focus shifts to the airway. It's important to open the airway to ensure that any rescue breaths administered afterward can be delivered effectively. While breaths are also a critical component of CPR, they come after the establishment of compressions and airway, demonstrating the sequence's prioritization.

This approach, particularly the emphasis on chest compressions first, is based on evidence indicating that prompt compressions significantly increase the chances of survival. Thus, the correct arrangement of C-A-B underlines the importance of each step in maximizing the effectiveness of CPR.