Which sign is an important indicator of a potential airway obstruction?

Cyanosis around the lips is a critical sign indicating a potential airway obstruction. This bluish discoloration occurs when there is insufficient oxygen in the blood, often due to lack of adequate airflow. When an airway is obstructed, the body's ability to exchange gases is compromised, leading to a decrease in oxygen levels. The lips are particularly sensitive and can display cyanosis even when other areas of the skin may not show visible signs, making it a clear and significant indicator of an emergent situation.

While rapid breathing can indicate distress or a variety of respiratory conditions, it does not specifically signal an obstruction. Leaning forward may reflect a person's instinctive positioning commonly used to ease breathing but does not uniquely point to obstruction. Unilateral weakness is more related to neurological issues rather than airway problems and does not serve as a direct indicator of airway compromise.