Which of the following can indicate respiratory distress in a patient?

Cyanosis is a clear indicator of respiratory distress as it signifies a lack of adequate oxygenation in the blood. When a patient exhibits cyanosis, usually noted as a bluish tint in the skin, especially around the lips, fingertips, or earlobes, it suggests that the body is not receiving enough oxygen. This can occur in various respiratory conditions, including asthma, pneumonia, or severe allergic reactions, where proper airflow is compromised.

While there are other signs and symptoms that can accompany respiratory distress, such as abnormal breathing patterns or changes in heart rate or blood pressure, cyanosis directly relates to the oxygenation status of the blood, making it a crucial and immediate indicator of respiratory issues requiring attention.