What is the recommended CPR sequence for a single-rescuer adult?

• A. 30 chest compressions followed by 2 breaths, repeating cycles until EMS arrives or an AED is ready.
• B. 2 compressions followed by 30 breaths.
• C. 100 compressions only.
• D. 15 compressions, 1 breath.

Answer: (A)

In single-rescuer adult CPR, the cycle is 30 chest compressions followed by 2 rescue breaths, repeated until EMS arrives or an AED is ready. This pattern keeps blood flowing while also providing oxygen through breaths. Aim for a rate of 100–120 compressions per minute and a depth of about 2 inches (5 cm), with full chest recoil after each compression. After 30 compressions, give two breaths, each lasting about one second, and watch for the chest to rise. Use the AED as soon as it’s available and follow its prompts; if a shock is advised, deliver it and then immediately resume CPR with compressions first. If you’re unable to provide breaths, performing hands-only CPR (compressions only) is better than stopping, but the standard taught sequence for a trained single rescuer remains 30 compressions to 2 breaths.