Ellis and Associates Lifeguard Training Practice Exam

In a situation where the airway is blocked and the object causing the obstruction is not visible, the most appropriate action is to provide chest compressions. This method is critical in situations where traditional methods such as back blows might not be effective or when the rescuer cannot visualize or access the obstruction.

Chest compressions create pressure in the chest cavity, which can help to dislodge the object obstructing the airway by forcing air out of the lungs and potentially expelling the object. This technique is a fundamental component of the Chain of Survival as outlined in CPR guidelines, emphasizing the importance of acting quickly and effectively in life-threatening situations.

While performing back blows might be a common method for treating conscious choking victims, it may not be suitable in every instance. Additionally, providing rescue breaths would not be effective if the airway is blocked, as air cannot pass through. Calling for help is essential in emergency scenarios but does not provide immediate relief to the obstruction.

Hence, the most effective and recommended action in this scenario is to perform chest compressions to attempt to clear the obstructed airway.