Which of the following is a symptom of respiratory distress?

Cyanosis is considered a symptom of respiratory distress because it indicates a lack of adequate oxygen in the bloodstream, often resulting from respiratory issues. When the body does not receive sufficient oxygen, the skin, lips, or fingertips can develop a bluish tint, signaling that the individual may be experiencing respiratory problems. This is a critical sign that requires immediate assessment and intervention by medical professionals.

In contrast, stable breathing would suggest that the individual is not in respiratory distress, and a low heart rate is more commonly associated with bradycardia, which may not directly correlate with respiratory issues. Fever, while it may signal infection or illness, does not specifically indicate respiratory distress. Thus, cyanosis stands out as a clear and alarming sign in assessing a person's respiratory status.