During CPR for an adult, how many chest compressions are delivered before the first rescue breath?

• A. 15 compressions
• B. 5 compressions
• C. 30 compressions
• D. 2 compressions

Answer: (C)

In adult CPR the priority is to keep blood circulating to the brain and heart. Chest compressions restore that circulation, while rescue breaths oxygenate the blood once circulation is underway. For a single rescuer, the standard pattern is 30 chest compressions followed by 2 rescue breaths. So the first rescue breath comes after 30 compressions. Aim for a rate of about 100–120 compressions per minute and a depth of about 2 inches (5 cm). If an advanced airway is in place, breaths are given every 6 seconds while compressions continue.