CPR ratio chest compressions to rescue breaths?

CPR ratio chest compressions to rescue breaths?

• A. 20 compressions:2 breaths
• B. 30 compressions:2 breaths
• C. 15 compressions:2 breaths
• D. 40 compressions:2 breaths

Answer: (B)

The main idea is that for adult CPR performed by a single rescuer, the recommended rhythm is 30 chest compressions followed by 2 rescue breaths. This 30:2 ratio balances keeping blood flowing with delivering enough oxygen to the lungs. Aim for about 100–120 compressions per minute and a depth of ~5 cm (2 inches), with each breath delivered over about a second and causing the chest to rise visibly. After the two breaths, resume compressions immediately to minimize interruptions. The other options don’t align with the standard single-rescuer adult CPR pattern: they would either under- or over-ventilate relative to the compression effort. So, the 30 compressions to 2 breaths is the established guideline.

The main idea is that for adult CPR performed by a single rescuer, the recommended rhythm is 30 chest compressions followed by 2 rescue breaths. This 30:2 ratio balances keeping blood flowing with delivering enough oxygen to the lungs. Aim for about 100–120 compressions per minute and a depth of ~5 cm (2 inches), with each breath delivered over about a second and causing the chest to rise visibly. After the two breaths, resume compressions immediately to minimize interruptions. The other options don’t align with the standard single-rescuer adult CPR pattern: they would either under- or over-ventilate relative to the compression effort. So, the 30 compressions to 2 breaths is the established guideline.