When you encounter an unresponsive patient with suspected cardiac arrest before EMS arrives, what is the recommended first action?

• A. Check for responsiveness and breathing for 10 seconds before acting.
• B. Begin CPR immediately and use an AED if available; monitor the patient and call for help.
• C. Wait for EMS to arrive before starting CPR.
• D. Provide only rescue breaths for 2 minutes before chest compressions.

Answer: (B)