Which method is effective in managing an obstructed airway?

The Heimlich maneuver is the correct method for managing an obstructed airway, particularly in cases of choking due to foreign objects. The technique involves delivering abdominal thrusts to create increased pressure in the abdomen, which can force the object lodged in the airway out, thus restoring normal breathing. This method is specifically designed for airway obstruction situations and has been widely recognized and taught as a first-aid response to this emergency.

In contrast, other methods listed have different purposes and are not suitable for addressing an obstructed airway. CPR (cardiopulmonary resuscitation) is used when a person is unresponsive and not breathing, but it does not directly resolve airway obstructions. Using a tourniquet is primarily for controlling severe bleeding, and applying ice is generally a treatment for injuries like swelling or pain but does not aid in clearing an obstructed airway. Therefore, the Heimlich maneuver stands out as the effective response for this specific emergency situation.