While you are assisting in the clinic, you notice a patient suddenly becomes unresponsive, is not breathing, and has no palpable pulse. After calling for help and activating the emergency response system, what is the NEXT best step you should take?
Check the patient's mouth for obstructions and remove if any are found.
Start cardiopulmonary resuscitation (CPR) with chest compressions.
Wait for emergency medical services (EMS) to arrive before starting any intervention.
Elevate the patient's legs to increase blood flow to the heart.