If the second breath also does not enter, what should a lifeguard suspect?

When the second breath does not enter, the lifeguard should suspect that the airway may be obstructed. In drowning or respiratory emergencies, an obstructed airway is a common issue that can prevent air from entering the lungs. This can occur due to various reasons such as foreign bodies, swelling, or the individual being in a position where the airway cannot be adequately opened.

Recognizing this potential obstruction is critical for effective resuscitation. Lifeguards are trained to perform techniques such as repositioning the head, using the jaw thrust maneuver, or performing abdominal thrusts if necessary, depending on the situation. The inability to ventilate despite multiple attempts underscores the need for immediate action to clear the airway and ensure that the victim can receive proper ventilation.

By focusing on the possibility of an obstructed airway, the lifeguard can take the appropriate steps to assist the victim effectively, which is crucial in life-saving scenarios.