How do you help a patient choking with a blocked airway?

If a patient is choking and unable to breathe, perform the Heimlich maneuver (abdominal thrusts). Stand behind the person, wrap your arms around their waist, and make a fist with one hand, placing it just above the navel. Grasp your fist with the other hand and thrust inward and upward until the object is expelled or the person can breathe. If the person becomes unconscious, call for emergency help and begin CPR.