What immediate first aid measure is appropriate for a patient with a blocked airway?

The appropriate immediate first aid measure for a patient with a blocked airway is to apply the Heimlich maneuver, also known as abdominal thrusts. This technique is specifically designed to dislodge an object that is obstructing the airway, allowing for the patient to breathe again. The maneuver works by creating pressure in the abdomen, which can force the object out of the airway when performed correctly.

In situations where a person's airway is blocked, time is critical, and this technique can be life-saving. Administering oxygen or checking vital signs are not immediate interventions that address the blockage itself; they can be part of the overall care process but are not effective in resolving the immediate danger of a blocked airway. Similarly, giving a glass of water could exacerbate the situation by causing further choking or aspiration and is not a recommended action when someone is experiencing an airway obstruction.