In single rescuer CPR, which statement correctly describes the protocol?

• A. It is used when there are two rescuers
• B. It uses a 15:2 ratio for adults
• C. It is the same as two-rescuer CPR
• D. It uses 30 compressions and 2 breaths for adults

Answer: (D)

The main idea is the breathing-to-compression balance used for an adult when one rescuer is performing CPR. In this scenario, you deliver cycles of chest compressions followed by rescue breaths in a 30:2 ratio. That means after 30 firm chest compressions, you give 2 quick breaths (about 1 second each) and then resume compressions. This pattern preserves blood flow while providing enough ventilation, and it continues until an AED is ready to be attached, more advanced help arrives, the patient starts showing signs of life, or you are unable to continue. The other statements aren’t accurate for adults: 15:2 is a ratio taught for certain pediatric two-rescuer situations, and while two rescuers can manage CPR efficiently, the essential adult protocol used by a single rescuer remains 30 compressions to 2 breaths.