Final answer:
The first thing to do for someone who is choking and unable to respond verbally is to perform the Heimlich maneuver. Hitting the person between the shoulder blades is not recommended. Calling 911 should be done after attempting the Heimlich maneuver.
Step-by-step explanation:
The first thing to do for someone who is choking and unable to respond verbally is to perform the Heimlich maneuver. This technique involves standing behind the person and using abdominal thrusts to forcefully remove the blockage from the person's airway. Hitting the person between the shoulder blades is not recommended as it may not effectively dislodge the object, and it can cause more harm. Additionally, asking the person if they are choking may not be possible if they are unable to respond verbally. Calling 911 is an important step to take, but should be done after attempting the Heimlich maneuver.
Learn more about Choking first aid