In adult CPR, how many chest compressions are typically delivered before the first rescue breath?

• A. 15
• B. 30
• C. 60
• D. 45

Answer: (B)

High-quality adult CPR prioritizes circulating blood to the heart and brain. The standard sequence is 30 chest compressions before giving the first rescue breath, forming a 30:2 cycle of compressions to ventilations. This pattern maximizes perfusion during the critical early moments of resuscitation; breaths come after a brief, consistent block of compressions to minimize interruptions. The other numbers don’t fit the typical adult rhythm: 15 is associated with some pediatric two-rescuer scenarios, while 60 and 45 aren’t part of the recommended adult pattern. If an advanced airway is in place, ventilation timing can differ, but the initial guideline remains 30 compressions before the first breath.